TW201935758A - Antenna structure and wireless communication device with same - Google Patents

Abstract

The present invention provides an antenna structure including a side frame, a first feed portion, a second feed portion, and a first ground portion. The side frame defines a first gap and a second gap. The side frame is divided into a first radiating portion through the first and second gaps. When current is fed from the first feed portion, the current flows through a first resonating section and is grounded through the first ground portion to activate a first mode and a second mode. When the current is fed from the first feed portion, the current flows through a second resonating section and is grounded through the second feed portion to activate a third mode. When the current is fed from the second feed portion, the current flows through the second and first resonating sections, and is grounded through the first ground portion to activate a fourth mode.

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, electronic devices such as mobile phones and personal digital assistants have continued to develop toward diversified functions, thinner and lighter, and faster and more efficient data transmission. However, the space that can accommodate antennas is getting smaller and smaller, and with the continuous development of Long Term Evolution (LTE) technology, the bandwidth of antennas is constantly increasing. Therefore, how to design an antenna with a wide bandwidth in a limited space is an important issue for antenna design.

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 frame, a first feeding portion, a second feeding portion, and a first ground portion. The frame is provided with a first breakpoint and a second breakpoint, and the first breakpoint and the second breakpoint All the points penetrate and cut off the frame, the first breakpoint and the second breakpoint jointly divide a first radiating portion from the frame, and one end of the first feeding portion is electrically connected to the first radiating portion. And the first radiating portion is divided into a first resonance section and a second resonance section, and the second feeding section is electrically connected to an end portion of the second resonance section near the first breakpoint, the The first grounding portion is electrically connected to an end of the first resonance section near the second breakpoint. When a current is fed from the first feeding section, a current flows through the first resonance section and passes through the first resonance section. The first grounding part is grounded to excite the first working mode and the second working mode to generate radiation signals in the first radiation frequency band and the second radiation frequency band. When the current is fed from the first feeding part, the current Flowing through the second resonance section and grounded through the second feed-in to excite the third work State to generate a radiation signal in a third radiation band. When a current is fed from the second feeding section, a current flows through the second resonance section and the first resonance section and passes through the first ground section. Grounding, which in turn excites the fourth working mode to generate a radiation signal in the fourth radiation band.

A wireless communication device includes the antenna structure described above.

The antenna structure and the wireless communication device having the antenna structure are provided with the frame, and the first breakpoint and the second breakpoint on the frame are used to divide the antenna structure from the frame, so that a broadband design can be effectively implemented .

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 an element is considered to be "electrically connected" to another element, it can be a contact connection, for example, a wire connection method, or a non-contact connection method, 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 wireless communication devices 200 such as mobile phones and personal digital assistants to transmit and receive radio waves to transmit and exchange wireless signals.

The wireless communication device 200 further includes a substrate 21. The substrate 21 can be made of a dielectric material such as epoxy glass fiber (FR4). The substrate 21 is provided with a first feeding point 211, a second feeding point 212, and a third feeding point 214. The first feeding point 211, the second feeding point 212, and the third feeding point 214 are disposed on the substrate 21 at intervals to feed current to the antenna structure 100.

In this embodiment, the substrate 21 is further provided with at least three electronic components, namely a first electronic component 217, a second electronic component 218, and a third electronic component 219. The first electronic component 217, the second electronic component 218, and the third electronic component 219 are all disposed on the same side of the substrate 21, and are all located at the second feeding point 212 and the third feeding point 214 between. In this embodiment, the first electronic component 217 is an audio interface module, which is disposed between the first feeding point 211 and the third feeding point 214 and is close to the third feeding point. The entry point 214 is set. The second electronic component 218 is a front camera module, which is disposed between the first feeding point 211 and the second feeding point 212. The third electronic component 219 is a speaker module, which is located between the first electronic component 217 and the second electronic component 218. The third electronic component 219 is disposed between the first feeding point 211 and the third feeding point 214 and is disposed near the first feeding point 211.

Please also refer to FIG. 2. The antenna structure 100 includes at least a housing 11, a first feeding portion 12, a second feeding portion 13, a first grounding portion 14, a third feeding portion 15, a fourth feeding portion 16, and a second feeding portion.地 部 17。 The ground portion 17.

The casing 11 may be a casing of the wireless communication device 200. The casing 11 includes at least a frame 112. In this embodiment, the frame 112 is made of a metal material. The frame 112 is substantially ring-shaped. The casing 11 may further include a back plate (not shown). The back cover is disposed on the frame 112, and forms a containing space 114 together with the frame 112. The accommodating space 114 is used for accommodating electronic components or circuit modules such as a substrate 21 and a processing unit of the wireless communication device 200.

The frame 112 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 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.

A first breakpoint 118 and a second breakpoint 119 are defined on the frame 112. In this embodiment, the first breakpoint 118 is located at a position of the end portion 115 near the first side portion 116. The second break point 119 is formed at a position of the end portion 115 near the second side portion 117. The first breakpoint 118 and the second breakpoint 119 both penetrate and block the frame 112. The first breakpoint 118 and the second breakpoint 119 collectively divide the frame 112 into a first radiating portion E1, a second radiating portion E2, and a third radiating portion E3 which are arranged at intervals. Wherein, the frame 112 between the first breakpoint 118 and the second breakpoint 119 forms the first radiation portion E1. The first breakpoint 118 is far from the first radiation portion E1 and the frame 112 on the side of the second breakpoint 119 forms the second radiation portion E2. The second breakpoint 119 is far from the first radiation portion E1 and the frame 112 on the side of the first breakpoint 118 forms the third radiation portion E3. In this embodiment, the second radiating portion E2 and the third radiating portion E3 are both grounded.

It can be understood that the first radiation portion E1 is further provided with an opening 120. The opening 120 corresponds to the first electronic component 217, so that the first electronic component 217 is partially exposed from the opening 120. In this way, the user can insert an audio component (such as a headset) through the opening 120 to establish an electrical connection with the first electronic component 217.

It can be understood that, in this embodiment, the first breakpoint 118 and the second breakpoint 119 are both filled with an insulating material, such as plastic, rubber, glass, wood, ceramic, etc., but not limited thereto.

The first feeding portion 12 is disposed inside the casing 11 and is located between the second electronic component 218 and the third electronic component 219. One end of the first feeding portion 12 is electrically connected to the first radiating portion E1, and the other end is electrically connected to the first feeding point 211 through a matching element 121, so as to feed the first radiating portion E1. Current signal. In this embodiment, the matching element 121 is a zero-ohm resistor, that is, short-circuited. Of course, in other embodiments, the matching element 121 is not limited to the zero-ohm resistance described above, and may also be a capacitor, an inductor, or a combination thereof.

In this embodiment, the first feeding section 12 further divides the first radiating section E1 into a first resonance section E11 and a second resonance section E12. Wherein, the frame 112 between the first feeding portion 12 and the second break point 119 forms the first resonance section E11. The frame 112 between the first feeding portion 12 and the first break point 118 forms the second resonance section E12. In this embodiment, the first feeding portion 12 is not electrically connected to the middle position of the first radiating portion E1, so the length of the first resonance section E11 is greater than the length of the second resonance section E12.

The second feeding portion 13 is disposed inside the casing 11 and is disposed between the second electronic component 218 and the first side portion 116. One end of the second feeding portion 13 is electrically connected to a Near Field Communication (NFC) chip 132 through a matching element 131, and is grounded through the NFC chip 132. The other end of the second feeding portion 13 is electrically connected to an end of the second resonance section E12 near the first breakpoint 118. In this embodiment, the matching element 131 is an inductor, and its inductance value is 39 nH. Of course, in other embodiments, the matching element 131 is not limited to the inductor described above, and may also be a capacitor, other matching elements, or a combination thereof.

The first ground portion 14 is disposed inside the casing 11 and is located between the first electronic component 217 and the second side portion 117. One end of the first grounding portion 14 is grounded through a grounding element 141, and the other end is electrically connected to an end of the first resonance section E11 near the second breakpoint 119 for providing the first radiation portion E1. Ground. In this embodiment, the ground element 141 is an inductor, and its inductance value is 5.6 nH. Of course, in other embodiments, the ground element 141 is not limited to the above-mentioned inductor, and may also be a capacitor, other matching elements, or a combination thereof.

In this embodiment, the third feeding portion 15 is disposed inside the casing 11. One end of the third feeding portion 15 is electrically connected to the second feeding point 212 through a matching element 151, and the other end is electrically connected to the second radiating portion E2 to feed current to the second radiating portion E2. Signal. In this embodiment, the matching element 151 is a capacitor, and its capacitance value is 1.2 pF. Of course, it can be understood that, in other embodiments, the matching element 151 is not limited to the capacitor described above, and may also be an inductor, other matching elements, or a combination thereof.

The fourth feeding portion 16 is disposed inside the casing 11. One end of the fourth feeding portion 16 is electrically connected to an end of the third radiating portion E3 near the second break point 119, and the other end is electrically connected to the third feeding point 214 through a matching circuit 161. It is thought that the third radiation part E3 is fed with a current signal. In this embodiment, the matching circuit 161 includes a first matching unit 163 and a second matching unit 165. One end of the first matching unit 163 is electrically connected to the third feeding point 214, and the other end is electrically connected to one of the fourth feeding portion 16 and the second matching unit 165. The other end of the second matching unit 165 is grounded. In this embodiment, the first matching unit 163 is a capacitor, and its capacitance value is 0.8 pF. The second matching unit 165 is an inductor with an inductance value of 6.2 nH. Of course, in other embodiments, the first matching unit 163 and the second matching unit 165 are not limited to the capacitors and inductors described above, and may be other matching components or a combination thereof.

The second grounding portion 17 is disposed inside the casing 11 and is spaced from the fourth feeding portion 16. One end of the second grounding portion 17 is electrically connected to the third radiating portion E3, and the other end is grounded, thereby providing grounding for the third radiating portion E3.

Understandably, please refer to FIG. 3 as well. After the current is fed from the first feeding portion 12, the current will flow through the first resonance section E11 and the first grounding portion 14 in sequence, and through the grounding element 141 Ground (see path P1). In this way, the first feed-in portion 12, the first resonance section E11, and the first ground portion 14 together form a loop antenna, thereby exciting the first working mode and the second working mode to generate a first radiation frequency band. And radiation signals in the second radiation band. In addition, when a current is fed from the first feeding section 12, the current will also flow through the second resonance section E12, the second feeding section 13, and the NFC chip 132, and through the NFC chip 132 ground (see path P2). In this way, the first feeding section 12, the second resonance section E12, and the second feeding section 13 together constitute another loop antenna to excite a third working mode to generate a radiation signal in a third radiation frequency band.

After the current is fed from the second feeding section 13, the current will flow through the second resonance section E12, the first resonance section E11, and the first grounding section 14 in order, and grounded through the grounding element 141 (see Path P3). In this way, the second feeding portion 13, the first radiating portion E1, and the first grounding portion 14 together constitute a loop antenna, and then a fourth working mode is excited to generate a radiation signal in a fourth radiation frequency band.

When the third feeding portion 15 feeds a current, the current is fed into the second radiating portion E2 through the third feeding portion 15 and is grounded (see path P4). In this way, the third feeding portion 15 and the second radiating portion E2 together form a loop antenna, and then excite a fifth working mode to generate a radiation signal in a fifth radiating frequency band.

When the fourth feeding portion 16 feeds a current, the current is fed into the third radiating portion E3 through the fourth feeding portion 16, and is grounded through the second grounding portion 17 (see path P5 ). In this way, the fourth feeding portion 16, the third radiating portion E3, and the second grounding portion 17 collectively constitute a loop antenna, and further excite a sixth working mode to generate a radiation signal in a sixth radiation frequency band.

In this embodiment, the first working mode is a low-frequency mode of an LTE-Advanced (LTE-Advanced). The second working mode and the third working mode are both LTE-A intermediate frequency modes. The fourth working mode is an NFC mode. The fifth working mode includes a GPS mode, a WIFI 2.4 / 5GHz mode, and an LTE-A high-frequency mode. The sixth working mode includes a WIFI 2.4 / 5GHz mode. The frequency of the first radiation band is 699-960 MHz. The frequency of the second radiation frequency band is a multiple of the first radiation frequency band. The frequencies of the second radiation frequency band and the third radiation frequency band are 1805-2170 MHz. The frequency of the fourth radiation band is 13.56 MHz. The frequency of the fifth radiation band includes 1575-1605 MHz, 2412-2485 MHz, 5125-5825 MHz, and 2300-2690 MHz. The frequency of the sixth radiation band includes 2412-2485 MHz and 5125-5825 MHz.

Obviously, in this embodiment, the first feeding portion 12, the second feeding portion 13, the first radiating portion E1, and the first ground portion 14 collectively constitute a first antenna. The third feeding portion 15 and the second radiating portion E2 constitute a second antenna. The fourth feeding portion 16, the third radiating portion E3, and the second ground portion 17 constitute a third antenna. The first antenna is a diversity antenna and an NFC antenna. The second antenna is a diversity antenna, a Global Positioning System (GPS) antenna, and a WIFI 2.4 / 5GHz antenna. The third antenna is a WIFI 2.4 / 5GHz antenna. Among the first antennas, the first feeding portion 12, the second feeding portion 13, the first radiating portion E1, and the first grounding portion 14 constitute a diversity antenna. The second feeding portion 13, the first radiating portion E1, and the first ground portion 14 constitute an NFC antenna. When the first antenna operates in the third radiation frequency band, the first antenna is grounded through the second feeding portion 13. When the first antenna operates in a fourth radiation frequency band, the first antenna feeds a current signal through the second feeding portion 13. That is to say, the second feed-in portion 13 can serve as a diversity antenna site and a signal feed-in point of the NFC antenna at the same time.

FIG. 4 is a graph of S-parameters (scattering parameters) of a first antenna in the antenna structure 100. FIG. 5 is a graph of gain efficiency of the first antenna in the antenna structure 100. FIG. 6 is a graph of S-parameters (scattering parameters) of a second antenna in the antenna structure 100. FIG. 7 is a graph of gain efficiency of the second antenna in the antenna structure 100. FIG. 8 is a graph of an S parameter (scattering parameter) of a third antenna in the antenna structure 100. FIG. 9 is a graph of gain efficiency of a third antenna in the antenna structure 100.

Obviously, from FIG. 4 to FIG. 9, the operating frequency of the antenna structure 100 can cover 699-960 MHz, 1710-2690 MHz, 1575-1605 MHz, and 5125-5825 MHz, that is, LTE-A low, medium , High frequency band, GPS frequency band, NFC frequency band, WIFI 2.4 / 5GHz frequency band, the frequency range is wide, and when the antenna structure 100 works in the above frequency band, its operating frequency can meet the antenna working design requirements, and has better Radiation efficiency.

As described in the previous embodiment, the antenna structure 100 defines the first radiating portion E1 and the second radiating portion E2 from the frame 112 by setting the first breakpoint 118 and the second breakpoint 119. The antenna structure 100 is further provided with a first feeding portion 12, a second feeding portion 13, a first grounding portion 14, and a third feeding portion 15, so that the current of the first feeding portion 12 is fed into the first feeding portion 12. The first resonance section E11 of the radiating section E1 is grounded through the first grounding section 14 to excite a first working mode to generate a radiation signal in a low frequency band and excite a second working mode to generate a first intermediate frequency band Radiation signal. The current of the first feeding section 12 is also fed to the second resonance section E12 of the first radiating section E1 and is grounded through the second feeding section 13 to excite a third working mode to generate a second Radiation signals in the intermediate frequency band. The current of the third feeding portion 15 is fed to the second radiating portion E2, so that the second radiating portion E2 can generate a radiation signal in a high frequency band. Therefore, the wireless communication device 200 can use LTE-Advanced Carrier Aggregation (CA) technology to simultaneously receive or send wireless signals in multiple different frequency bands to increase the transmission bandwidth.

Furthermore, in this embodiment, since the second antenna and the third antenna can both generate or receive WIFI 2.4 / 5GHz radiation signals, the antenna structure 100 can implement WIFI MIMO (Multi-input Multi- output) function. That is, the antenna structure 100 in this case can completely achieve the receiving and transmitting functions required for 4G LTE mobile phones covering LTE / GSM / UMTS, GPS 1575MHz, Wi-Fi MIMO 2.4 / 5GHz, and NFC 13.56 MHz bands, including 700/850/900 / 1800/1900/2100/2300/2500 MHz, GPS 1575MHz, Wi-Fi 2.4 / 5GHz, NFC 13.56MHz and other frequency band receiving and transmitting functions, and also has 3CA function and Wi-Fi MIMO function.

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.

100‧‧‧ Antenna Structure

11‧‧‧shell

112‧‧‧border

114‧‧‧accommodation space

115‧‧‧ tip

116‧‧‧First side

117‧‧‧ second side

118‧‧‧ the first breakpoint

119‧‧‧ Second breakpoint

120‧‧‧ opening

12‧‧‧First Feeding Department

13‧‧‧Second Feeding Department

14‧‧‧ the first ground

15‧‧‧Third Feeding Department

16‧‧‧Fourth Feeding Department

17‧‧‧ second ground

E1‧‧‧First Radiation Department

E11‧‧‧The first resonance section

E12‧‧‧Second resonance section

E2‧‧‧Second Radiation Department

E3‧‧‧Third Radiation Department

121, 131, 151‧‧‧ matching components

132‧‧‧NFC chip

141‧‧‧ grounding element

161‧‧‧ matching circuit

163‧‧‧first matching unit

165‧‧‧Second matching unit

200‧‧‧Wireless communication device

21‧‧‧ substrate

211‧‧‧First feed point

212‧‧‧Second Feed Point

214‧‧‧Third feed point

217‧‧‧The first electronic component

218‧‧‧Second electronic component

219‧‧‧Third electronic component

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 a circuit diagram of the antenna structure shown in FIG. 1. FIG. 3 is a schematic diagram of a current trend of the antenna structure shown in FIG. 2. FIG. 4 is a graph of S parameters (scattering parameters) of the first antenna in the antenna structure shown in FIG. 1. FIG. 5 is a gain efficiency diagram of the first antenna in the antenna structure shown in FIG. 1. FIG. 6 is a graph of S parameters (scattering parameters) of the second antenna in the antenna structure shown in FIG. 1. FIG. 7 is a gain efficiency diagram of the third antenna in the antenna structure shown in FIG. 1. FIG. 8 is a graph of S parameters (scattering parameters) of a third antenna in the antenna structure shown in FIG. 1. FIG. 9 is a gain efficiency diagram of the third antenna in the antenna structure shown in FIG. 1.

no

Claims (12)

An antenna structure is improved in that the antenna structure includes a frame, a first feeding portion, a second feeding portion, and a first ground portion. The frame is provided with a first breakpoint and a second breakpoint, and the first A breakpoint and the second breakpoint both penetrate and block the frame, and the first breakpoint and the second breakpoint jointly divide a first radiating portion from the frame, and one end of the first feeding portion Is electrically connected to the first radiating section, and divides the first radiating section into a first resonance section and a second resonance section; the second feeding section is electrically connected to the second resonance section near the first resonance section An end portion of the breakpoint, the first ground portion is electrically connected to an end portion of the first resonance section close to the second breakpoint, and when a current is fed from the first feeding portion, a current flows through the The first resonance section is grounded through the first grounding part to excite the first working mode and the second working mode to generate radiation signals in the first radiation frequency band and the second radiation frequency band. After being fed by a feed-in part, current flows through the second resonance section and passes through the second feed Ground to excite a third working mode to generate a radiation signal in a third radiation frequency band, and when a current is fed from the second feeding section, a current flows through the second resonance section and the first resonance section, The first grounding portion is grounded, and a fourth working mode is excited to generate a radiation signal in a fourth radiation frequency band. The antenna structure according to item 1 of the scope of patent application, wherein the first working mode is an LTE-A low-frequency mode, and the second working mode and the third working mode are both LTE-A intermediate-frequency modes. State, and the fourth working mode is a near field communication (Near Field Communication, NFC) mode. The antenna structure according to item 2 of the scope of patent application, wherein the antenna structure further comprises an NFC chip, and one end of the second feeding portion is electrically connected to the second resonance section, and the other end is electrically connected to the NFC chip. And grounding through the NFC chip, so that the antenna structure works in the NFC mode. The antenna structure according to item 1 of the patent application scope, 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 first breakpoint and the second breakpoint are opened on the end portion, and the border between the first breakpoint and the second breakpoint constitutes the first Radiation department. The antenna structure according to item 4 of the scope of patent application, wherein the first breakpoint is far from the first radiation portion and the frame on the side of the second breakpoint forms a second radiation portion, and the antenna structure It further includes a third feeding portion, the second radiating portion is grounded, and one end of the third feeding portion is electrically connected to an end portion of the second radiating portion near the first breakpoint, so that the second radiating portion is The current signal is fed, and the fifth working mode is excited to generate a radiation signal in a fifth radiation band. The antenna structure according to item 5 of the scope of patent application, wherein the fifth working mode includes a GPS mode, a WIFI 2.4 / 5GHz mode, and an LTE-A high-frequency mode. The antenna structure according to item 5 of the scope of patent application, wherein the second breakpoint is far from the first radiating portion and the frame on the side of the first breakpoint forms a third radiating portion, and the antenna structure A fourth feed-in portion and a second ground portion are further included, the third radiating portion is grounded, and one end of the fourth feed-in portion is electrically connected to an end portion of the third radiating portion near the second breakpoint, the The second grounding portion is electrically connected to the third radiating portion. When a current is fed from the fourth feeding portion, the third radiating portion excites a sixth working mode to generate a radiation signal in a sixth radiating frequency band. The antenna structure according to item 7 of the scope of patent application, wherein the sixth working mode is a WIFI 2.4 / 5GHz mode. The antenna structure according to item 1 of the scope of patent application, wherein the first breakpoint and the second breakpoint are both filled with an insulating material. The antenna structure according to item 5 of the scope of patent application, wherein the wireless communication device uses carrier aggregation technology and uses the first radiating portion and the second radiating portion to receive or send wireless signals in multiple different frequency bands simultaneously. The antenna structure according to item 7 of the scope of patent application, wherein the wireless communication device uses the second radiating portion and the third radiating portion to implement a WIFI MIMO function. A wireless communication device includes the antenna structure according to any one of claims 1-11 of the scope of patent application.