TWI658645B - Antenna structure and wireless communication device with same - Google Patents

Abstract

An antenna structure includes a casing, four feed sources, a first internal radiator, a second internal radiator, and a third internal radiator. The casing is provided with a first radiating portion and a second radiating portion. The first to third internal radiators are all disposed in the housing, the first internal radiator and the second internal radiator are spaced and coupled, and the four feed sources are electrically connected to the first radiator, A second radiating portion, a first internal radiator, and a third internal radiating body, the first radiating portion simultaneously excites a first mode and a second mode; the second radiating portion, the first to third The inner radiator excites a third mode, a fourth mode, a fifth mode, and a sixth mode, respectively.

Description

Antenna structure and wireless communication device having the same

The invention relates to an antenna structure and a wireless communication device having the antenna structure.

With the advancement of wireless communication technology, wireless communication devices continue to develop toward the trend of thinness and lightness, and consumers have increasingly higher requirements for product appearance. Because metal casings have advantages in appearance, mechanism strength, and heat dissipation effects, more and more manufacturers have designed wireless communication devices with metal casings, such as metal backplanes, to meet consumer demand. However, the metal casing easily interferes with shielding the signals radiated by the antennas arranged in it, and it is not easy to achieve a broadband design, resulting in poor radiation performance of the built-in antenna. Furthermore, the backplane is usually provided with slots and breakpoints, which will affect the integrity and aesthetics of the backplane.

In view of this, it is necessary to provide an antenna structure and a wireless communication device having the antenna structure.

An antenna structure includes a housing, a first feed source, a second feed source, a third feed source, a fourth feed source, a first internal radiator, a second internal radiator, and a third internal radiator. The housing is provided with a first radiating portion and a second radiating portion, and the first feed source is electrically connected to the first radiating portion to feed a current signal to the first radiating portion, thereby making the first radiating portion The first radiating section simultaneously excites the first and second modalities to generate signals in the first and second frequency bands; the second feed source is electrically connected to the second radiating section, and the second radiating section is regarded as the second radiating section. Radiator feeds current Signal, so that the second radiating part excites a third mode to generate a signal of a third frequency band; the first internal radiator, the second internal radiator, and the third internal radiator are all disposed in the housing The third feed source is electrically connected to the first inner radiator to feed a current signal to the first inner radiator, thereby causing the first inner radiator to excite a fourth mode to generate a first A signal of four frequency bands; the second internal radiator is coupled to the first internal radiator at a distance, and the first internal radiator is further configured to couple a current signal to the second internal radiator, so that The second internal radiator excites a fifth mode to generate a signal in a fifth frequency band; the fourth feed source is electrically connected to the third internal radiator to feed a current signal to the third internal radiator. Further causing the third internal radiator to excite a sixth mode to generate a signal in a sixth frequency band; the signal in the fifth frequency band is higher than the signals in the sixth and fourth frequency bands, and the sixth frequency band And the fourth frequency band signal is higher than the second frequency band signal, the second frequency band Signal is higher than the third frequency band of the signal, the signal of the third frequency band higher than the first frequency band of the signal.

A wireless communication device includes the antenna structure described in the above item.

The antenna structure and the wireless communication device having the antenna structure can cover LTE-A low, medium, and high frequency bands, GPS frequency bands, and WIFI 2.4GHz / 5GHz frequency bands, and the frequency range is wide. In addition, the slot, the first slot, the second slot and the break point on the antenna structure are provided on the front frame and the frame, and are not provided on the back plate, so that the back plate constitutes The all-metal structure, that is, there is no insulation slot, disconnection or break point on the back plate, so that the back plate can avoid affecting the integrity and aesthetics of the back plate due to the setting of the slot, break or break point. Sex.

100‧‧‧ Antenna Structure

11‧‧‧shell

111‧‧‧Front frame

112‧‧‧Backboard

113‧‧‧Border

114‧‧‧accommodation space

115‧‧‧ tip

116‧‧‧First side

117‧‧‧ second side

118‧‧‧Slotted

119‧‧‧First breakpoint

121‧‧‧ Second breakpoint

122‧‧‧ Gap

F1‧‧‧First feed source

F2‧‧‧Second feed source

F3‧‧‧ Third feed source

F4‧‧‧ Fourth feed source

G1‧‧‧First ground

G2‧‧‧Second Grounding Section

T1‧‧‧ the first end

T2‧‧‧ second end

H1‧‧‧First Radiation Department

H11‧‧‧First branch

H12‧‧‧Second Branch

H2‧‧‧Second Radiation Department

13‧‧‧The first internal radiator

131‧‧‧The first radiation arm

132‧‧‧Second Radiation Arm

133‧‧‧ Third Radiation Arm

134‧‧‧ Fourth Radiation Arm

135‧‧‧ fifth radiation arm

136‧‧‧ Sixth Radiation Arm

137‧‧‧The seventh radiation arm

138‧‧‧ Eighth Radiation Arm

15‧‧‧Second Internal Radiator

151‧‧‧The first parasitic segment

153‧‧‧Second Parasitic Section

17‧‧‧ third internal radiator

171‧‧‧Feedback

172‧‧‧First connection

173‧‧‧Second Connection Section

174‧‧‧The third connection

175‧‧‧ grounding section

18‧‧‧ switching circuit

181‧‧‧Switch unit

183‧‧‧Switching element

19‧‧‧ matching circuit

200‧‧‧Wireless communication device

201‧‧‧display unit

203‧‧‧Dual lens module

204‧‧‧through hole

FIG. 1 is a schematic diagram of applying an antenna structure to a wireless communication device according to a preferred embodiment of the present invention.

FIG. 2 is an assembly diagram of the wireless communication device shown in FIG. 1.

FIG. 3 is an assembly diagram of the wireless communication device shown in FIG. 1 from another angle.

FIG. 4 is a circuit diagram of the antenna structure shown in FIG. 1.

FIG. 5 is a circuit diagram of a switching circuit in the antenna structure shown in FIG. 4.

FIG. 6 is a schematic diagram of a current flow during the operation of the antenna structure shown in FIG. 4.

FIG. 7 is a graph of S-parameters (scattering parameters) when the antenna structure shown in FIG. 1 works in a low-IF mode.

FIG. 8 is a graph of S parameters (scattering parameters) of the antenna structure shown in FIG. 1 when the LTE-A low-IF mode and the GPS mode are operated.

FIG. 9 is a graph of S-parameters (scattering parameters) of the antenna structure shown in FIG. 1 when the LTE-A high-frequency mode is operated.

FIG. 10 is a graph of S parameters (scattering parameters) of the antenna structure shown in FIG. 1 when the WIFI 2.4GHz mode and the WIFI 5GHz mode are operated.

FIG. 11 is a diagram of the total radiation efficiency of the antenna structure shown in FIG. 1 when the LTE-A low-IF mode is operated.

FIG. 12 is a graph of the total radiation efficiency of the antenna structure shown in FIG. 1 when it works in the GPS mode.

FIG. 13 is a diagram of the total radiation efficiency of the antenna structure shown in FIG. 1 when the LTE-A high-frequency mode is operated.

FIG. 14 is a graph of the total radiation efficiency of the antenna structure shown in FIG. 1 when it operates in WIFI 2.4GHz mode and WIFI 5GHz mode.

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those with ordinary knowledge in the art without any creative labor belong to the protection scope of the present invention.

It should be noted that when an element is called "electrically connected" to another element, it may be directly on the other element or there may be a centered element. When a component is considered "electrical "Connecting" another element, which may be a contact connection, for example, a wire connection method, or a non-contact connection, for example, a non-contact coupling method.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

Referring to FIG. 1, a preferred embodiment of the present invention provides an antenna structure 100 that can be applied to a wireless communication device 200 such as a mobile phone, a personal digital assistant, or a tablet computer to transmit and receive radio waves to transmit and exchange wireless signals. .

Please refer to FIG. 2 and FIG. 3 together. The antenna structure 100 includes a housing 11, a first feed source F1, a second feed source F2, a third feed source F3, a fourth feed source F4, and a first feed source F1. The ground portion G1, the second ground portion G2, the first inner radiator 13, the second inner radiator 15, and the third inner radiator 17.

The casing 11 may be a casing of the wireless communication device 200. In this embodiment, the casing 11 is made of a metal material. The casing 11 includes a front frame 111, a back plate 112 and a frame 113. The front frame 111, the back plate 112, and the frame 113 may be integrally formed. The front frame 111, the back plate 112, and the frame 113 constitute a casing of the wireless communication device 200. The front frame 111 is provided with an opening (not shown) for receiving the display unit 201 of the wireless communication device 200. It can be understood that the display unit 201 has a display plane, the display plane is exposed from the opening, and the display plane is substantially parallel to the back plate 112.

The back plate 112 is opposite to the front frame 111. The back plate 112 is directly connected to the frame 113, and there is no gap between the back plate 112 and the frame 113. In this embodiment, the back The plate 112 is a single metal sheet integrally formed to expose the dual lens module 203. The back plate 112 is provided with a through hole 204. The back plate 112 is not provided with any slot, break or break point for dividing the insulation of the back plate 112. The back plate 112 is equivalent to a place where the antenna structure 100 and the wireless communication device 200 are located.

The frame 113 is sandwiched between the front frame 111 and the back plate 112, and is disposed around the periphery of the front frame 111 and the back plate 112, respectively, so as to communicate with the display unit 201 and the front plate. The frame 111 and the back plate 112 together form an accommodating space 114. The accommodating space 114 is used for accommodating electronic components or circuit modules such as a circuit board and a processing unit of the wireless communication device 200 therein.

The frame 113 includes at least a tip portion 115, a first side portion 116, and a second side portion 117. In this embodiment, the end portion 115 is a top end of the wireless communication device 200. The end portion 115 connects the front frame 111 and the back plate 112. The first side portion 116 and the second side portion 117 are disposed opposite to each other, and the two are disposed at both ends of the end portion 115 respectively, and are preferably disposed vertically. The first side portion 116 and the second side portion 117 are also connected to the front frame 111 and the back plate 112.

A slot 118 is defined in the frame 113. The front frame 111 is provided with a first break point 119, a second break point 121 and a gap 122. In this embodiment, the slot 118 is disposed on the end portion 115 and extends to the first side portion 116 and the second side portion 117 respectively.

The first break point 119, the second break point 121, and the slit 122 are all communicated with the slot 118 and extend to cut off the front frame 111. In this embodiment, the first breakpoint 119 is opened on the front frame 111 and communicates with the first end T1 of the slot 118 disposed on the first side portion 116. The second break point 121 is opened on the front frame 111 and communicates with the second end T2 of the slot 118 disposed on the second side portion 117. The slit 122 is formed on the end portion 115. The gap 122 is disposed between the first breakpoint 119 and the second breakpoint 121, and is connected to the first breakpoint 119 and the second breakpoint 121. The slot 118 communicates. In this way, the slot 118, the first break point 119, the second break point 121, and the gap 122 collectively separate at least two parts spaced apart from each other, that is, the first radiation portion H1 and the second Radiation section H2. Wherein, the front frame 111 between the first break point 119 and the slit 122 constitutes the first radiation portion H1. The front frame 111 between the second break point 121 and the slit 122 constitutes the second radiating portion H2. In this embodiment, the position of the slit 122 does not correspond to the middle of the end portion 115, so the length of the first radiation portion H1 is greater than the length of the second radiation portion H2.

It can be understood that, in this embodiment, the slot 118, the first break point 119, the second break point 121, and the gap 122 are all filled with an insulating material (such as plastic, rubber, glass, wood, ceramics). Etc., but not limited to this).

It can be understood that, in this embodiment, the slot 118 is opened at one end of the frame 113 near the back plate 112 and extends to the front frame 111 so that the first radiating portion H1 and the second The radiating portion H2 is composed entirely of the front frame 111. Of course, in other embodiments, the opening position of the slot 118 may be adjusted according to specific requirements. For example, the slot 118 is formed at one end of the frame 113 near the back plate 112 and extends in a direction where the front frame 111 is located, so that the first radiation portion H1 and the second radiation portion H2 are partially formed. The front frame 111 and a part of the frame 113 are formed.

It can be understood that, in other embodiments, the slot 118 may be provided only at the end portion 115 without extending to any one of the first side portion 116 and the second side portion 117, or the The slot 118 is disposed on the end portion 115 and extends along only one of the first side portion 116 and the second side portion 117. In this way, the positions of the first end T1 and the second end T2, the positions of the first break point 119, and the second break point 121 can also be adjusted according to the positions of the slot 118. For example, the first end T1 and the second end T2 may both be located at positions of the front frame 111 corresponding to the end portions 115. For example, one of the first end T1 and the second end T2 may be located corresponding to the front frame 111 The position of the end portion 115 and the other of the first end T1 and the second end T2 may be opened at a position of the front frame 111 corresponding to the first side portion 116 or the second side portion 117. Obviously, the shape and position of the slot 118 and the positions of the first end T1 and the second end T2 on the frame 113 can be adjusted according to specific requirements, and only the slot 118, the The first break point 119, the second break point 121, and the gap 122 may be divided from the casing 11 into a first radiating portion H1 and a second radiating portion H2 that are disposed at intervals.

It can be understood that, except for the slot 118, the first break point 119, the second break point 121, and the gap 122, the upper half of the front frame 111 and the frame 113 are not provided with other insulation slots, disconnections, or breaks. point.

Please refer to FIG. 4 together, the first feed source F1 is disposed in the accommodation space 114. One end of the first feeding source F1 is electrically connected to the first radiating portion H1 to feed current to the first radiating portion H1. The other end of the first feed source F1 is electrically connected to the backplane 112, that is, grounded. In this embodiment, after a current is fed from the first feed source F1, the current is transmitted to the first breakpoint 119 and the gap 122 at the first radiation portion H1, so that the first radiation The part H1 is further divided into a first branch H11 opposite to the first breakpoint 119 and a second branch H12 opposite to the gap 122 with the first feed source F1 as a separation point. Specifically, a portion of the first feed source F1 to the front frame 111 provided with the first breakpoint 119 forms the first branch H11. A portion of the first feed source F1 to the front frame 111 provided with the slit 122 forms the second branch H12.

The first ground portion G1 is disposed in the accommodating space 114 and is located between the first side portion 116 and the first feed source F1. One end of the first ground portion G1 is electrically connected to the first branch H11, and the other end is electrically connected to the back plate 112, that is, grounded, thereby providing grounding for the first branch H11.

The second ground portion G2 is disposed in the accommodating space 114 and is located in the slit. Between the gap 122 and the first feed source F1. One end of the second ground portion G2 is electrically connected to the second branch H12, and the other end is electrically connected to the back plate 112, that is, grounded, thereby providing ground for the second branch H12.

It can be understood that, in this embodiment, the first feed source F1, the first branch H11, and the first ground portion G1 constitute an inverted F-type antenna, thereby exciting a first mode to generate a radiation signal in a first frequency band. . The first feed source F1, the second branch H12, and the second ground portion G2 constitute another inverted F-type antenna, which in turn excites a second mode to generate a radiation signal in a second frequency band. In this embodiment, the first mode is a low-frequency mode of Long Term Evolution Advanced (LTE-A), and the second mode is an LTE-A intermediate frequency mode. The frequency of the second frequency band is higher than the frequency of the first frequency band. The first frequency band is a 703-960MHz frequency band, and the second frequency band is a 1710-2170MHz frequency band.

The second feed source F2 is disposed in the accommodating space 114 and is disposed adjacent to the second break point 121. One end of the second feeding source F2 is electrically connected to one end of the second radiating portion H2 near the second break point 121 to feed current to the second radiating portion H2. The other end of the second feed-in source F2 is electrically connected to the backplane 112, that is, grounded. In this embodiment, the second feed source F2 and the second radiating portion H2 together form a monopole antenna, and then a third mode is excited to generate a radiation signal in a third frequency band. The third mode is a GPS mode. The frequency of the third frequency band is higher than the frequency of the first frequency band and smaller than the frequency of the second frequency band. The third frequency band is a 1575 MHz frequency band.

Please refer to FIG. 4 together, the first inner radiator 13 is disposed in the accommodation space 114 and is located between the first ground portion G1 and the first side portion 116. The first inner radiator 13 includes a first radiation arm 131, a second radiation arm 132, a third radiation arm 133, a fourth radiation arm 134, a fifth radiation arm 135, a sixth radiation arm 136, and a seventh radiation arm connected in this order. The radiation arm 137 and the eighth radiation arm 138.

The first radiation arm 131 is substantially straight, and is disposed substantially parallel to the first side portion 116. The second radiating arm 132 is substantially straight, and is vertically connected to one end of the first radiating arm 131 near the end portion 115 and parallel to the end portion 115 and near the second side portion 117 Extending in the direction. The third radiating arm 133 is substantially straight, and one end of the third radiating arm 133 is vertically connected to one end of the second radiating arm 132 away from the first radiating arm 131, and is parallel to the first side portion 116 and close to the The end portion 115 extends in the direction. In this embodiment, the first radiating arm 131 and the third radiating arm 133 are respectively disposed at two ends of the second radiating arm 132 and are disposed facing away from each other.

The fourth radiation arm 134 is substantially straight, and one end of the fourth radiation arm 134 is vertically connected to an end of the third radiation arm 133 away from the second radiation arm 132. The fourth radiation arm 134 is parallel to the end portion 115 and faces the first radiation arm. The side portion 116 extends in the direction. The second radiation arm 132 and the fourth radiation arm 134 are disposed on the same side of the third radiation arm 133, and together with the third radiation arm 133 form a generally U-shaped structure. The fifth radiating arm 135 is substantially straight, and one end of the fifth radiating arm 135 is vertically connected to an end of the fourth radiating arm 134 away from the third radiating arm 133. The fifth radiating arm 135 is parallel to the first side portion 116 and is close to the end. The end portion 115 extends in the direction.

The sixth radiating arm 136 is substantially straight, and one end of the sixth radiating arm 136 is vertically connected to an end of the fifth radiating arm 135 far from the fourth radiating arm 134 and is parallel to the end portion 115 and close to the first The side portion 116 extends in the direction. The seventh radiating arm 137 is substantially straight, and one end of the seventh radiating arm 137 is vertically connected to one end of the sixth radiating arm 136 away from the fifth radiating section 135 and parallel to the first side portion 116 and away from the The end portion 115 extends in the direction. The fifth radiation arm 135 and the seventh radiation arm 137 are disposed on the same side of the sixth radiation arm 136 and together with the sixth radiation arm 136 form a generally U-shaped structure. The eighth radiation arm 138 is substantially straight, and one end of the eighth radiation arm 138 is vertically connected to one end of the seventh radiation arm 137 away from the sixth radiation arm 136, and is parallel to the end portion 115 and close to the first The side portion 116 extends in the direction.

The third feed source F3 is disposed in the accommodation space 114 and is disposed adjacent to the first breakpoint 119. One end of the third feed source F3 is electrically connected to one end of the first radiation arm 131 in the first internal radiator 13 far from the second radiation arm 132 to feed the first internal radiator 13. Into the current. The other end of the third feed source F3 is electrically connected to the backplane 112, that is, grounded. In this embodiment, the third feed source F3 and the first inner radiator 13 together form a monopole antenna, and then a fourth mode is excited to generate a fourth-band radiation signal. The fourth mode is a WIFI 2.4GHz mode. The fourth frequency band is a WIFI 2.4GHz (2400-2480MHz) frequency band.

The second inner radiator 15 is disposed in the accommodation space 114 and is located between the first inner radiator 13 and the first side portion 116. The second internal radiator 15 includes a first parasitic section 151 and a second parasitic section 153. The first parasitic section 151 is substantially straight, one end of which is electrically connected to the back plate 112, that is, grounded, and the other end extends in a direction parallel to the first side portion 116 and close to the eighth radiation arm 138. . The second parasitic section 153 is substantially straight, and one end of the second parasitic section 153 is vertically connected to one end of the first parasitic section 151 near the eighth radiating arm 138 and parallel to the eighth radiating arm 138 and close to the eighth radiating arm 138. The third radiation arm 133 extends in a direction until it reaches a space surrounded by the first inner radiator 13.

It can be understood that, in this embodiment, the second internal radiator 15 and the first internal radiator 13 are spaced and coupled to each other, and are further formed with the first internal radiator 13 and the third feed source F3. The coupling is fed into the antenna to excite a fifth mode to generate a radiation signal in a fifth frequency band. The fifth mode is a WIFI 5GHz mode. The fifth frequency band is a WIFI 5GHz (5150-5850MHz) frequency band.

The third inner radiator 17 is disposed in the accommodating space 114 and is located between the second ground portion G2 and the second side portion 117 and is disposed adjacent to the second side portion 117. The third inner radiator 17 is a zigzag sheet body, and includes a feeding section 171, a first connecting section 172, and a second The connection section 173, the third connection section 174, and the ground section 175. The feeding section 171 is substantially straight, and is arranged at a substantially parallel interval with the second side portion 117 and extends in a direction where the end portion 115 is located. The first connecting section 172 is substantially straight, and one end of the first connecting section 172 is vertically connected to one end of the feeding section 171 near the end portion 115 and parallel to the end portion 115 and near the first side portion 116. It extends in the direction until it passes through the gap 122. The second connecting section 173 is substantially straight, and one end of the second connecting section 173 is vertically connected to one end of the first connecting section 172 away from the feeding section 171 and parallel to the second side portion 117 and close to the end. The direction of the portion 115 extends. In this embodiment, the second connection section 173 and the feed-in section 171 are respectively disposed at both ends of the first connection section 172 and are disposed facing away from each other.

The third connection section 174 is substantially straight, and one end of the third connection section 174 is vertically connected to an end of the second connection section 173 away from the first connection section 172 and parallel to the end portion 115 and near the second side portion. 117 extends to cross the gap 122 and continues to extend in a direction parallel to the end portion 115 and close to the second side portion 117. The ground segment 175 is substantially straight, and is spaced from and parallel to the feeding segment 171. One end of the ground segment 175 is vertically connected to one side of the first connection segment 172, and extends in a direction parallel to the feeding segment 171 and away from the end portion 115.

The fourth feed source F4 is disposed in the accommodation space 114 and is disposed adjacent to the second break point 121. One end of the fourth feed source F4 is electrically connected to one end of the feed section 171 away from the first connection section 172 to feed current to the third inner radiator 17. The other end of the fourth feed source F4 is electrically connected to the backplane 112, that is, grounded. One end of the ground segment 175 remote from the first connection segment 172 is electrically connected to the back plate 112, that is, grounded, thereby providing grounding for the third inner radiator 17.

It can be understood that, in this embodiment, the fourth feed source F4 and the third inner radiator 17 constitute an inverted F-type antenna, and then a sixth mode is excited to generate a radiation signal in the sixth frequency band. number. In this embodiment, the sixth mode is an LTE-A high-frequency mode. The frequencies of the sixth frequency band and the fourth frequency band are higher than the frequency of the second frequency band. The frequencies of the sixth frequency band and the fourth frequency band are smaller than the frequency of the fifth frequency band. The sixth frequency band is a frequency band of 2300-2690MHz.

Understandably, please refer to FIG. 1 and FIG. 4 again. In other embodiments, in order to make the first radiating portion H1 have a better low-frequency bandwidth, the antenna structure 100 may further include a switching circuit 18. The switching circuit 18 is disposed in the accommodating space 114. One end of the switching circuit 18 is electrically connected to the first ground portion G1 to be electrically connected to the first branch H11 of the first radiation portion H1 through the first ground portion G1. The other end of the switching circuit 18 is electrically connected to the back plate 112, that is, grounded.

Please refer to FIG. 5 together. The switching circuit 18 includes a switching unit 181 and at least one switching element 183. The switching unit 181 is electrically connected to the first ground portion G1 to be electrically connected to the first branch H11 of the first radiation portion H1 through the first ground portion G1. The switching element 183 may be an inductor, a capacitor, or a combination of an inductor and a capacitor. The switching elements 183 are connected in parallel with each other, and one end of the switching elements 183 is electrically connected to the switching unit 181, and the other end is electrically connected to the back plate 112, that is, grounded. In this way, by controlling the switching of the switching unit 181, the first branch H11 of the first radiating portion H1 can be switched to a different switching element 183. Since each switching element 183 has a different impedance, the low-frequency frequency of the antenna structure 100 can be effectively adjusted by the switching of the switching unit 181, that is, the first frequency band is adjusted.

For example, in this embodiment, the switching circuit 18 includes four switching elements 183. The four switching elements 183 are all inductors, and the inductance values are 27nH, 15nH, 9.1nH, and 6.2nH, respectively. When the switching unit 181 switches to the switching element 183 with an inductance value of 27 nH, the antenna structure 100 can work in the LTE-A band 17 frequency band (704-746 MHz). When the switching unit 181 is switched to the switching element 183 having an inductance value of 15 nH, the antenna structure 100 can work in the LTE-A band 20 frequency band (791-862 MHz). When the switching unit 181 switches to an inductance value When the switching element 183 is 9.1 nH, the antenna structure 100 can work in the LTE-A band 5 frequency band (824-894 MHz). When the switching unit 181 is switched to the switching element 183 having an inductance value of 6.2 nH, the antenna structure 100 can work in the LTE-A band 8 frequency band (880-960 MHz). That is, by switching of the switching unit 181, the low frequency of the antenna structure 100 can be covered to 704-960 MHz.

Understandably, please refer to FIG. 1 and FIG. 4 again. In this embodiment, in order to make the first radiating portion H1 have a better intermediate frequency bandwidth, the antenna structure 100 further includes a matching circuit 19. The matching circuit 19 is disposed in the accommodating space 114. One end of the matching circuit 19 is electrically connected to the second ground portion G2 to be electrically connected to the second branch H12 of the first radiation portion H1 through the second ground portion G2. The other end of the matching circuit 19 is electrically connected to the back plate 112, that is, grounded. In this embodiment, the matching circuit 19 includes an inductor L. One end of the inductor L is electrically connected to the second ground portion G2 to be electrically connected to the second branch H12 of the first radiation portion H1 through the second ground portion G2. The other end of the inductor L is electrically connected to the back plate 112, that is, grounded. The inductance L can match or compensate the impedance of the second branch H12. In this way, by adjusting the inductance value of the inductance L, the IF frequency of the antenna structure 100, that is, the second frequency band can be effectively adjusted, so that the IF of the antenna structure 100 can cover 1710-2170 MHz.

Please refer to FIG. 6 together. It can be understood that, in this embodiment, when a current is fed from the first feed source F1, a part of the current will flow through the first branch H11 of the first radiating portion H1, and Flowing to the first breakpoint 119, the first mode is excited to generate a radiation signal in a first frequency band (see path P1). Another part of the current will flow through the second branch H12 of the first radiating part H1 and flow to the gap 122, thereby exciting the second mode to generate a radiation signal in the second frequency band (see path P2).

When a current is fed from the second feed source F2, the current will flow through the second radiating portion H2 and flow to the gap 122, thereby exciting the third mode to generate a third frequency band. Radiation signal (see path P3). When a current is fed from the third feed source F3, the current will flow through the first inner radiator 13, thereby exciting a fourth mode to generate a radiation signal in a fourth frequency band (see path P4). At the same time, the current signal is also coupled from the first internal radiator 13 to the second internal radiator 15 to excite a fifth mode to generate a radiation signal in the fifth frequency band (see path P5). After the current is fed from the fourth feed source F4, the current will flow through the third internal radiator 17 and be grounded through the grounding section 175 of the third internal radiator 17, thereby exciting the sixth mode. State to generate a radiation signal in the sixth frequency band (see path P6).

Obviously, in this embodiment, the first radiating portion H1 and the third inner radiator 17 are diversity antennas. The second radiating portion H2 is a GPS antenna. The first inner radiator 13 is a WIFI 2.4GHz antenna. The second inner radiator 15 is a WIFI 5GHz antenna.

It can be understood that, in this embodiment, the back plate 112 can be used as a place for the antenna structure 100 and the wireless communication device 200. In another embodiment, a shielding mask for shielding electromagnetic interference or a middle frame supporting the display unit 201 may be provided on a side of the display unit 201 facing the back plate 112. The shielding cover or the middle frame is made of a metal material. The shield cover or the middle frame can be connected to the back plate 112 to serve as a place for the antenna structure 100 and the wireless communication device 200. At each of the above grounds, the shield cover or middle frame can replace the back plate 112 for grounding the antenna structure 100 or the wireless communication device 200. In another embodiment, the main circuit board of the wireless communication device 200 may be provided with a ground plane, which is grounded at each of the above locations. The ground plane may replace the backplane 112 for the antenna structure 100 or the antenna structure 100. The wireless communication device 200 is grounded. The ground plane may be connected to the shield cover, the middle frame, or the back plate 112.

FIG. 7 is a graph of S-parameters (scattering parameters) of the antenna structure 100 when the LTE-A low-IF mode is operated. Obviously, when the switching unit 181 in the switching circuit 18 is switched to a different switching element 183 (for example, four different switching elements 183), since each switching element 183 has different impedances. Therefore, the switching of the switching unit 181 can effectively adjust the frequency of the antenna structure 100 at a low frequency band. At the same time, by adjusting the inductance value of the inductance L in the matching circuit 19, the frequency of the antenna structure 100 in the middle frequency band can be effectively adjusted, thereby obtaining a better operating bandwidth.

FIG. 8 is a graph of S parameters (scattering parameters) of the antenna structure 100 when the LTE-A low-IF mode and the GPS mode are operated. The curve S81 is the value of S11 when the antenna structure 100 works in the LTE-A low-IF mode. The curve S82 is the S11 value when the antenna structure 100 works in the GPS mode. Curve S83 is the isolation between the first radiating portion H1 and the second radiating portion H2 when the antenna structure 100 works in the LTE-A low-IF mode and the GPS mode.

FIG. 9 is a graph of S parameters (scattering parameters) of the antenna structure 100 operating in the LTE-A high-frequency mode. FIG. 10 is a graph of S parameters (scattering parameters) of the antenna structure 100 when the WIFI 2.4GHz mode and the WIFI 5GHz mode are operated.

FIG. 11 is a diagram of the total radiation efficiency of the antenna structure 100 when the antenna structure 100 works in the LTE-A low-IF mode. The curve S111 is the total radiation efficiency of the antenna structure 100 when the switching unit 181 is switched to the switching element 183 having an inductance value of 27 nH when the antenna structure 100 operates in the LTE-A band 17 frequency band (704-746 MHz). The curve S112 is the total radiation efficiency of the antenna structure 100 when the switching unit 181 is switched to the switching element 183 having an inductance value of 15 nH when the antenna structure 100 operates in the LTE-A band 20 frequency band (791-862 MHz). The curve S113 is the total radiation efficiency of the antenna structure 100 when the switching unit 181 is switched to the switching element 183 having an inductance value of 9.1 nH when the antenna structure 100 operates in the LTE-A band 5 frequency band (824-894 MHz). The curve S114 is the total radiation efficiency of the antenna structure 100 when the switching unit 181 is switched to the switching element 183 having an inductance value of 6.2nH when the antenna structure 100 operates in the LTE-A band8 frequency band (880-960MHz). That is, by switching of the switching unit 181, the low frequency of the antenna structure 100 can be covered to 704-960 MHz. In addition, when the antenna structure 100 works in the LTE-A band 17/20/5/8 frequency band and the LTE-A mid-frequency band (1710-2170MHz), its average total The radiation efficiency is -8.1dB, -8.8dB, -9.0dB, -9.3dB, -5.3dB.

FIG. 12 is a diagram of the total radiation efficiency of the antenna structure 100 when it is operating in the GPS mode. FIG. 13 is a diagram of the total radiation efficiency of the antenna structure 100 when the antenna structure 100 operates in the LTE-A high-frequency mode. FIG. 14 is a graph of the total radiation efficiency of the antenna structure 100 when it works in WIFI 2.4GHz mode and WIFI 5GHz mode. Wherein, when the antenna structure 100 works in the GPS mode, its average total radiation efficiency is -6.1 dB. When the antenna structure 100 works in the LTE-A high-frequency mode, its average total radiation efficiency is -8.4 dB. When the antenna structure 100 works in the WIFI 2.4GHz mode, its average total radiation efficiency is -7.6dB. When the antenna structure 100 works in the WIFI 5GHz mode, its average total radiation efficiency is -6.0dB.

Obviously, as can be seen from FIG. 7 to FIG. 14, the working frequency band of the antenna structure 100 can cover 704-960MHz and 1710-2690MHz, which can be applied to GSM Quad-band, UMTS Band I / II / V / VIII frequency bands and worldwide Commonly used LTE 700/850/900/1800/1900/2100/2300/2500 frequency band. In addition, the antenna structure 100 can also work in the GPS frequency band and WIFI 2.4GHz / 5GHz frequency band, that is, it covers LTE-A low, middle and high frequency bands, GPS frequency band and WIFI 2.4GHz / 5GHz frequency band, with a wide frequency range. And when the antenna structure 100 operates in the above frequency band, its operating frequency can meet the antenna design requirements and has better radiation efficiency.

As described in the previous embodiments, the antenna structure 100 defines the first radiation portion H1 from the frame 113 by setting the first break point 119 and the slit 122. The antenna structure 100 is further provided with a third internal radiator 17. The first radiating portion H1 can excite the first mode and the second mode to generate radiation signals in the LTE-A low and intermediate frequency bands. The third internal radiator 17 can excite a sixth mode to generate a radiation signal in the LTE-A high frequency band. Therefore, the wireless communication device 200 can use LTE-A Carrier Aggregation (CA) technology and use the first radiation unit H1 and the third internal radiator 17 to receive or send wireless signals in multiple different frequency bands at the same time. increase Transmission bandwidth, that is, 3CA.

In addition, the antenna structure 100 is provided with the casing 11, and the slot 118, the first breakpoint 119, the second breakpoint 121, and the slot 122 on the casing 11 are provided in the front frame 111 and The frame 113 is not disposed on the back plate 112. In this way, only the front frame 111, the bezel 113, and the corresponding inner radiator (that is, the first inner radiator 13, the second inner radiator 15, and the third inner radiator 17) can be used to set up the corresponding LTE -A low, medium and high frequency antenna, GPS antenna and WIFI 2.4GHz / 5GHz antenna, covering a wide frequency band. In addition, the back plate 111 may constitute an all-metal structure, that is, the back plate 111 does not have insulation slots, breaks, or break points, so that the back plate 111 can avoid being damaged The setting of the dots affects the integrity and aesthetics of the back plate 111.

The above descriptions are merely preferred embodiments of the present invention, and are not intended to limit the present invention in any form. In addition, those skilled in the art can also make other changes within the spirit of the present invention. Of course, these changes made in accordance with the spirit of the present invention should be included in the scope of the present invention.

Claims (13)

An antenna structure, characterized in that the antenna structure includes a housing, a first feed source, a second feed source, a third feed source, a fourth feed source, a first internal radiator, and a second internal radiation. And a third internal radiator, the casing is provided with a first radiating portion and a second radiating portion, and the first feed source is electrically connected to the first radiating portion to feed the first radiating portion. An input current signal, so that the first radiating part simultaneously excites a first mode and a second mode to generate signals in a first frequency band and a second frequency band; the second feed source is electrically connected to the second A radiating part for feeding a current signal to the second radiating part, thereby causing the second radiating part to excite a third mode to generate a signal of a third frequency band; the first internal radiator and the second internal radiator And the third internal radiator are both disposed in the housing, and the third feed source is electrically connected to the first internal radiator, so as to feed a current signal to the first internal radiator, so that the first internal radiator is An internal radiator excites a fourth mode to generate a signal in a fourth frequency band; the second internal radiation One end is grounded, and the other end is coupled to the first internal radiator at a distance. The first internal radiator is further configured to couple a current signal to the second internal radiator, thereby making the second internal radiator. A fifth mode is excited to generate a signal in a fifth frequency band; the fourth feed source is electrically connected to the third internal radiator, so as to feed a current signal to the third internal radiator, so that the first The three internal radiators excite the sixth mode to generate signals in the sixth frequency band; the signals in the fifth frequency band are higher than the signals in the sixth and fourth frequency bands, and the signals in the sixth and fourth frequency bands A signal higher than the second frequency band, a signal of the second frequency band higher than a signal of the third frequency band, and a signal of the third frequency band higher than a signal of the first frequency band. The antenna structure according to item 1 of the scope of patent application, wherein the first radiating portion and the third inner radiator are both diversity antennas, the second radiating portion is a GPS antenna, and the first inner radiator Is a WIFI 2.4GHz antenna, the second internal radiator is a WIFI 5GHz antenna, the first mode is an LTE-A low frequency mode, and the second mode is an LTE-A intermediate frequency mode. The three modes are GPS modes, the fourth mode is WIFI 2.4GHz mode, the fifth mode is WIFI 5GHz mode, and the sixth mode is LTE-A high-frequency mode. The antenna structure according to item 1 of the scope of patent application, wherein the housing includes a front frame, a back plate, and a frame, and the frame is sandwiched between the front frame and the back plate, and the frame is opened on the frame. There is a slot, and the front frame is provided with a first break point, a second break point, and a gap. The first break point, the second break point, and the slot are all in communication with the slot and extend to cut off the front. A frame, the slot, the first breakpoint, the second breakpoint, and the gap collectively divide the first radiation portion and the second radiation portion from the housing. The antenna structure according to item 3 of the scope of patent application, wherein the frame includes at least an end portion, a first side portion, and a second side portion, and the first side portion and the second side portion are respectively connected to the ends. At both ends of the portion, the slot is opened at least at the end portion, the first breakpoint is opened at the first side portion, and the second breakpoint is opened at the second side portion, so The gap is opened on the end portion, and the front frame between the first breakpoint and the gap constitutes the first radiating portion, and the gap between the second breakpoint and the gap is The front frame constitutes the second radiation portion, and the first internal radiator and the second internal radiator are disposed between the first feed source and the first side portion; the third internal radiation A body is disposed adjacent to the second side portion. The antenna structure according to item 4 of the scope of patent application, wherein the first feed source is electrically connected to the first radiating part, and the first feed source is provided with the first feed source to the front frame. The part of the breakpoint forms a first branch, and the part from the first feed source to the front frame provided with the gap forms a second branch. The first branch is used to excite the first mode. The second branch is used to excite the second mode. The antenna structure according to item 5 of the scope of patent application, wherein the antenna structure further includes a first ground portion and a second ground portion, and one end of the first ground portion is electrically connected to the first branch and the other end is grounded. One end of the second ground portion is electrically connected to the second branch, and the other end is grounded, and the first feed source, the first branch, and the first ground portion constitute a first inverted-F antenna, and A second feed source, a second branch, and the second ground portion constitute a second inverted F-type antenna, the second feed source and the second radiating portion constitute a first monopole antenna, and the third feed An input source and the first internal radiator form a second monopole antenna, the third feed source, the first internal radiator, and the second internal radiator form a coupled feed antenna, and the fourth The feed source and the third internal radiator constitute a third inverted F-type antenna. The antenna structure according to item 6 of the scope of patent application, wherein the antenna structure further includes a switching circuit, the switching circuit includes a switching unit and at least one switching element, and the switching unit is electrically connected to the first ground portion, So that the switching elements are electrically connected to the first branch through the first ground portion, and the switching elements are connected in parallel with each other, and one end of the switching elements is electrically connected to the switching unit, and the other end is grounded. The switching causes the switching unit to switch to a different switching element, thereby adjusting the first frequency band. The antenna structure according to item 6 of the scope of patent application, wherein the antenna structure further includes a matching circuit, the matching circuit includes an inductor, and one end of the inductor is electrically connected to the second ground portion, so that The second ground portion is electrically connected to the second branch, and the other end of the inductor is grounded. The inductor matches or compensates the impedance of the second branch to adjust the second frequency band. The antenna structure according to item 4 of the scope of patent application, wherein the first inner radiator includes a first radiation arm, a second radiation arm, a third radiation arm, a fourth radiation arm, a fifth radiation arm, A sixth radiating arm, a seventh radiating arm, and an eighth radiating arm; the first radiating arm is in a straight bar shape and is arranged in parallel with the first side portion; the second radiating arm is vertically connected to the first The radiation arm is close to one end of the end portion and extends in a direction parallel to the end portion and close to the second side portion, and one end of the third radiation arm is vertically connected to the second radiation arm away from the first One end of the radiation arm extends in a direction parallel to the first side portion and close to the end portion, and one end of the fourth radiation arm is vertically connected to one end of the third radiation arm away from the second radiation arm, And extends in a direction parallel to the end portion and toward the first side portion, one end of the fifth radiation arm is vertically connected to one end of the fourth radiation arm away from the third radiation arm, and parallel to the end The direction of the first side portion near the end portion Extending, one end of the sixth radiation arm is vertically connected to one end of the fifth radiation arm away from the fourth radiation arm, and extends in a direction parallel to the end portion and close to the first side portion, and the first One end of the seventh radiating arm is vertically connected to one end of the sixth radiating arm away from the fifth radiating section, and extends in a direction parallel to the first side portion and away from the end portion, and one end of the eighth radiating arm is vertical. Connected to one end of the seventh radiating arm away from the sixth radiating arm and extending in a direction parallel to the end portion and close to the first side portion. The antenna structure according to item 9 of the scope of patent application, wherein the second inner radiator includes a first parasitic segment and a second parasitic segment, one end of the first parasitic segment is grounded, and the other end is parallel to the first side Extending in a direction close to the eighth radiating arm, one end of the second parasitic segment is vertically connected to one end of the first parasitic segment near the eighth radiating arm, and parallel to the eighth radiating arm and close to The third radiation arm extends in a direction until it reaches a space surrounded by the first inner radiator. The antenna structure according to item 4 of the scope of patent application, wherein the third internal radiator includes a feeding section, a first connecting section, a second connecting section, a third connecting section, and a grounding section. The second side portions are arranged in parallel and spaced apart, and extend toward the direction of the end portion; one end of the first connection section is vertically connected to one end of the feeding section near the end portion, and is parallel to the end portion. And extends in a direction close to the first side portion until it crosses the gap; one end of the second connecting section is vertically connected to one end of the first connecting section away from the feeding section, and parallel to the second The side portion extends in a direction close to the end portion; one end of the third connection section is vertically connected to one end of the second connection section away from the first connection section, and is parallel to the end portion and close to the second section The direction of the side portion extends to cross the gap, and continues to extend in a direction parallel to the end portion and close to the second side portion; the grounding section and the feeding section are spaced from each other and are arranged in parallel, the One end of the ground segment is connected vertically The first connecting section extends in a direction parallel to the feeding section and away from the end portion, and the other end of the grounding section is grounded. The antenna structure according to item 1 of the scope of patent application, wherein the wireless communication device uses carrier aggregation technology and uses the first radiating part and the third internal radiator to simultaneously receive or send wireless signals in multiple different frequency bands. A wireless communication device includes the antenna structure according to any one of claims 1-12 in the scope of patent application.