TWI668910B - Antenna structure and wireless communication device with same - Google Patents

Abstract

An antenna structure includes a frame, a first feeding portion, a second feeding portion, and a first grounding portion, wherein the frame has a first breaking point and a second breaking point, the first breaking point and the second breaking point Pointing from the frame to divide the first radiating portion, when a current is fed from the first feeding portion, a current flows through the first resonating portion and is grounded by the first ground portion to excite the first work a mode and a second mode of operation, when a current is fed from the first feed portion, a current flows through the second resonating section and is grounded by the second feed portion to excite a third operating mode. After the current is fed from the second feeding portion, a current flows through the second resonating section and the first resonating section, and is grounded by the first grounding portion, thereby exciting a fourth operating 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 same.

With the advancement of wireless communication technology, electronic devices such as mobile phones and personal digital assistants are constantly moving toward the trend of diversification, thinning, and faster and more efficient data transmission. However, the space for accommodating the antenna is also getting smaller and smaller, and with the continuous development of Long Term Evolution (LTE) technology, the bandwidth of the antenna is increasing. Therefore, how to design an antenna with a wider bandwidth in a limited space is an important issue in antenna design.

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

An antenna structure includes a frame, a first feeding portion, a second feeding portion, and a first grounding portion, wherein the frame has a first breaking point and a second breaking point, the first breaking point and the second breaking The first break point and the second break point jointly define a first radiating portion from the frame, and one end of the first feeding portion is electrically connected to the first radiation And dividing the first radiating portion into a first resonating portion and a second resonating portion, the second feeding portion being electrically connected to an end portion of the second resonating portion close to the first breaking point, a first ground portion electrically connected to an end of the first resonating section close to the second break point when current is fed from the first After the feeding portion, a current flows through the first resonating section and is grounded by the first grounding portion to excite the first working mode and the second working mode to generate the first radiating band and the second radiating band. a radiation signal, when a current is fed from the first feed portion, a current flows through the second resonating section and is grounded by the second feed portion to excite a third operating mode to generate a third radiation a radiation signal of the frequency band, when a current is fed from the second feeding portion, a current flows through the second resonating section and the first resonating section, and is grounded by the first grounding portion, thereby exciting the first The four operating modes are used to generate a radiation signal in the fourth radiation band.

A wireless communication device comprising the antenna structure described above.

The antenna structure and the wireless communication device having the antenna structure can effectively realize the broadband design by setting the frame and dividing the antenna structure from the frame by using the first break point and the second break point on the frame. .

100‧‧‧Antenna structure

11‧‧‧Shell

112‧‧‧Border

114‧‧‧ accommodating space

115‧‧‧End

116‧‧‧First side

117‧‧‧ second side

118‧‧‧First breakpoint

119‧‧‧second breakpoint

120‧‧‧ openings

12‧‧‧First Feeding Department

13‧‧‧Second Feeding Department

14‧‧‧First grounding

15‧‧‧ Third Feeding Department

16‧‧‧ Fourth Feeding Department

17‧‧‧Second grounding

E1‧‧‧First Radiation Department

E11‧‧‧First Resonance Section

E12‧‧‧Secondary resonating section

E2‧‧‧Second Radiation Department

E3‧‧‧ Third Radiation Department

121, 131, 151‧‧‧ matching components

132‧‧‧NFC chip

141‧‧‧ Grounding components

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‧‧‧First electronic components

218‧‧‧Second electronic components

219‧‧‧ Third electronic component

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

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

FIG. 3 is a schematic diagram of current flow 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.

Figure 5 is a graph showing the gain efficiency of the first antenna in the antenna structure shown in Figure 1.

6 is a graph of S-parameters (scattering parameters) of a second antenna in the antenna structure shown in FIG. 1.

7 is a gain efficiency diagram of a third antenna in the antenna structure shown in FIG. 1.

8 is a graph of S-parameters (scattering parameters) of a third antenna in the antenna structure shown in FIG. 1.

9 is a gain efficiency diagram of a third antenna in the antenna structure shown in FIG. 1.

The technology in the embodiment of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are described clearly and completely, and it is obvious that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without the creative work are all within the scope of the present invention.

It should be noted that when an element is referred to as being "electrically connected" to another element, it can be directly on the other element or the element can be present. When an element is considered to be "electrically connected" to another element, it can be a contact connection, for example, a wire connection or a non-contact connection, for example, a non-contact coupling.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art. The terminology used in the description of the invention herein is for the purpose of describing the particular embodiments. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The features of the embodiments and examples described below may be combined with each other without conflict.

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 or a personal digital assistant to transmit and receive radio waves to transmit and exchange wireless signals.

The wireless communication device 200 also 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 feed point 211, a second feed point 212, and a third feed point 214. The first feed point 211, the second feed point 212, and the third feed point 214 are spaced apart from each other on the substrate 21 for feeding current to the antenna structure 100.

In this embodiment, at least three electronic components are further disposed on the substrate 21, That is, the first electronic component 217, the second electronic component 218, and the third electronic component 219. The first electronic component 217 , the second electronic component 218 , and the third electronic component 219 are disposed on the same side of the substrate 21 , and are located at the second feeding point 212 and the third feeding point 214 . between. In the embodiment, the first electronic component 217 is an audio interface module disposed between the first feed point 211 and the third feed point 214 and adjacent to the third feed. In point 214 settings. The second electronic component 218 is a front camera module disposed between the first feed point 211 and the second feed point 212. The third electronic component 219 is a speaker module located between the first electronic component 217 and the second electronic component 218. The third electronic component 219 is disposed between the first feed point 211 and the third feed point 214 and is disposed adjacent to the first feed point 211.

Referring 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 ground portion 14 , a third feeding portion 15 , a fourth feeding portion 16 , and a second portion. Grounding portion 17.

The housing 11 can be an outer casing of the wireless communication device 200. The housing 11 includes at least a bezel 112. In this embodiment, the frame 112 is made of a metal material. The bezel 112 has a substantially annular structure. The housing 11 may also include a backing plate (not shown). The back cover is disposed on the frame 112 and defines a receiving space 114 together with the frame 112. The accommodating space 114 is used for accommodating the electronic components or circuit modules of the substrate 21 and the 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 the embodiment, the end portion 115 is the top end of the wireless communication device 200. The first side portion 116 is disposed opposite to the second side portion 117, and is disposed at two ends of the end portion 115, preferably vertically.

A first break point 118 and a second break point 119 are defined on the frame 112. In this implementation In the example, the first break point 118 is opened at a position where the end portion 115 is close to the first side portion 116. The second break point 119 is opened at a position where the end portion 115 is close to the second side portion 117. The first break point 118 and the second break point 119 both penetrate and block the frame 112. The first break point 118 and the second break point 119 collectively divide the frame 112 into a first radiating portion E1, a second radiating portion E2, and a third radiating portion E3. The frame 112 between the first break point 118 and the second break point 119 forms the first radiating portion E1. The frame 116 of the first break point 118 away from the first radiating portion E1 and the second break point 119 forms the second radiating portion E2. The second break point 119 is away from the first radiation portion E1 and the frame 112 on the side of the first break point 118 to form 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 such that the first electronic component 217 is partially exposed from the opening 120. In this way, the user can insert an audio component (for example, an earphone) 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 break point 118 and the second break point 119 are filled with an insulating material, such as plastic, rubber, glass, wood, ceramics, etc., but not limited thereto.

The first feeding portion 12 is disposed inside the casing 11 and 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 by a matching element 121, thereby feeding the first radiating portion E1. Current signal. In this embodiment, the matching component 121 has a zero ohm resistance, that is, a short circuit. Of course, in other embodiments, the matching component 121 is not limited to the zero ohm resistor described above, and may also be a capacitor, an inductor, or a combination thereof.

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

The second feeding portion 13 is disposed inside the casing 11 and 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 by a matching component 131 and grounded by the NFC wafer 132. The other end of the second feeding portion 13 is electrically connected to an end of the second resonating section E12 near the first breaking point 118. In this embodiment, the matching component 131 is an inductor having an inductance value of 39 nH. Of course, in other embodiments, the matching component 131 is not limited to the inductance described above, and may also be a capacitor, other matching components, or a combination thereof.

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

In the 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 by 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 component 151 is a capacitor having a capacitance value of 1.2 pF. Of course, it can be understood that in other embodiments, the matching component 151 is not limited to the capacitor described above, and may also be an inductor, other matching components, 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 breaking point 119, and the other end is electrically connected to the third feeding point 214 by a matching circuit 161. It is assumed that the third radiating portion E3 feeds a current signal. In the 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 end 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 having a capacitance value of 0.8 pF. The second matching unit 165 is an inductor having 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 spaced apart 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.

It can be understood that, referring to FIG. 3, when a current is fed from the first feeding portion 12, current will sequentially flow through the first resonating section E11 and the first grounding portion 14, and the grounding component is 141 ground (refer to path P1). Thus, the first feeding portion 12, the first resonating portion 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 the first radiating band. And the radiation signal of the second radiation band. In addition, when a current is fed from the first feeding portion 12, the current will also flow through the second resonating section E12, the second feeding portion 13, and the NFC wafer 132, and by the NFC chip. 132 grounding (reference path P2). As such, the first feeding portion 12, the second resonating portion E12, and the second feeding portion 13 together constitute another loop antenna to excite the third operating mode to generate a radiated signal of the third radiating band.

After the current is fed from the second feeding portion 13, the current will sequentially flow through the second resonating section E12, the first resonating section E11 and the first grounding portion 14, and grounded by the grounding element 141 (see Path P3). In this way, the second feeding portion 13, the first radiating portion E1 and the first ground portion 14 together form a loop antenna, thereby exciting the fourth operating mode to generate a radiation signal of the fourth radiating band.

When the third feeding portion 15 feeds a current, the current is fed into the second radiating portion E2 by the third feeding portion 15 and grounded (refer to the path P4). As such, the third feeding portion 15 and the second radiating portion E2 together form a loop antenna, thereby exciting the fifth operating mode to generate a radiation signal of the fifth radiating band.

When the fourth feeding portion 16 feeds a current, the current is fed into the third radiating portion E3 by the fourth feeding portion 16 and grounded by the second ground portion 17 (refer to the path P5) ). As such, the fourth feeding portion 16, the third radiating portion E3, and the second ground portion 17 together form a loop antenna, thereby exciting the sixth operating mode to generate a radiation signal of the sixth radiating band.

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

Obviously, in the embodiment, the first feeding portion 12, the second feeding portion 13, the first radiating portion E1 and the first ground portion 14 together 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 2.4/5 GHz antenna. The third antenna is a WIFI 2.4/5 GHz antenna. In the first antenna, the first feeding portion 12, the second feeding portion 13, the first radiating portion E1, and the first ground portion 14 constitute a diversity antenna. The second feeding portion 13, the first radiation 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 by the second feeding portion 13. When the first antenna operates in the fourth radiation frequency band, the first antenna feeds a current signal by the second feeding portion 13. That is to say, the second feeding portion 13 can serve as both the ground of the diversity antenna and the signal feeding point of the NFC antenna.

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

Obviously, as can be seen 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, to cover the LTE-A low, medium, and high frequency bands. , GPS band, NFC band, WIFI 2.4/5GHz The frequency band and the frequency range are wide, and when the antenna structure 100 works in the above frequency band, the operating frequency can meet the antenna working design requirements and has better radiation efficiency.

As described in the previous embodiment, the antenna structure 100 divides the first radiating portion E1 and the second radiating portion E2 from the frame 112 by providing the first break point 118 and the second break point 119. The antenna structure 100 is further provided with a first feeding portion 12, a second feeding portion 13, a first ground portion 14 and a third feeding portion 15, so that the current of the first feeding portion 12 is fed to the first The first resonating section E11 of the radiating portion E1 is grounded by the first grounding portion 14 to excite the first operating mode to generate a radiated signal in the low frequency band, and to excite the second operating mode to generate the first intermediate frequency band. Radiation signal. The current of the first feeding portion 12 is further fed to the second resonating section E12 of the first radiating portion E1, and is grounded by the second feeding portion 13 to excite the third working mode to generate the second Radiation signal in the IF 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 of a high frequency band. Therefore, the wireless communication device 200 can simultaneously receive or transmit wireless signals in a plurality of different frequency bands to increase the transmission bandwidth by using Carrier Aggregation (CA) technology of LTE-Advanced.

Furthermore, in this embodiment, since the second antenna and the third antenna can generate or receive the WIFI 2.4/5 GHz radiation signal, the antenna structure 100 can implement WIFI MIMO (Multi-input Multi- Output) function. That is to say, the antenna structure 100 of the present invention can completely meet the receiving and transmitting functions of the LTE/GSM/UMTS, GPS 1575MHz, Wi-Fi MIMO 2.4/5GHz, and NFC 13.56MHz bands required for 4G LTE mobile phones, including 700/850/900/ Receive and transmit functions in the 1800/1900/2100/2300/2500MHz and GPS 1575MHz, Wi-Fi 2.4/5GHz, NFC 13.56MHz bands, and both 3CA and Wi-Fi MIMO.

The above is only a preferred embodiment of the present invention, and is not intended to be an invention. What is the form of the limit. In addition, those skilled in the art can make other changes in the spirit of the present invention. Of course, the changes made in accordance with the spirit of the present invention should be included in the scope of the present invention.

Claims (11)

An antenna structure is improved in that the antenna structure includes a frame, a first feeding portion, a second feeding portion, and a first grounding portion, and the frame has a first breaking point and a second breaking point, the first The break point and the second break point both penetrate and block the frame, and the first break point and the second break point jointly divide the first radiating portion from the frame, and one end of the first feeding portion Electrically connecting to the first radiating portion, and dividing the first radiating portion into a first resonating portion and a second resonating portion, the second feeding portion being electrically connected to the second resonating portion being close to the first An end portion of the break point, the first ground portion is electrically connected to an end of the first resonating portion close to the second break point, and when a current is fed from the first feed portion, a current flows through the The first resonating section is grounded by the first grounding portion to excite the first operating mode and the second operating mode to generate radiation signals of the first radiating band and the second radiating band, when the current is from the After a feed is fed, a current flows through the second resonating section and is fed by the second Grounding to excite a third operating mode to generate a radiation signal of a third radiating band, and when a current is fed from the second feeding portion, a current flows through the second resonating section and the first resonating section, And transmitting, by the first grounding portion, the fourth working mode to generate a radiation signal of the fourth radiation frequency band, wherein the fourth working mode is a Near Field Communication (NFC) mode. The antenna structure further includes an NFC wafer, one end of the second feeding portion is electrically connected to the second resonating portion, and the other end is electrically connected to the NFC wafer, and is grounded by the NFC wafer, so that The antenna structure operates in the NFC mode. The antenna structure of claim 1, 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. The antenna structure of claim 1, wherein the frame comprises at least a tip end portion, a first side portion and a second side portion, wherein the first side portion and the second side portion respectively Connecting the two ends of the end portion, the first break point and the second break point are formed on the end portion, and the frame between the first break point and the second break point is formed The first radiating portion. The antenna structure of claim 3, wherein the frame of the first breakpoint away from the first radiating portion and the second breakpoint side forms a second radiating portion, the antenna structure Further including 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 close to the first breaking point to be the second radiating portion The current signal is fed, and the fifth operating mode is excited to generate a radiation signal of the fifth radiation band. The antenna structure of claim 4, wherein the fifth working mode comprises a GPS mode, a WIFI 2.4/5 GHz mode, and an LTE-A high frequency mode. The antenna structure of claim 4, wherein the second breakpoint is away from the frame of the first radiating portion and the first breakpoint side to form a third radiating portion, the antenna structure Further including a fourth feeding portion and a second grounding portion, the third radiating portion is grounded, and one end of the fourth feeding portion is electrically connected to an end portion of the third radiating portion near the second breaking point, The second grounding portion is electrically connected to the third radiating portion, and when the current is fed from the fourth feeding portion, the third radiating portion excites the sixth operating mode to generate a radiation signal of the sixth radiating band. The antenna structure of claim 6, wherein the sixth working mode is a WIFI 2.4/5 GHz mode. The antenna structure of claim 1, wherein the first break point and the second break point are filled with an insulating material. The antenna structure of claim 4, wherein the wireless communication device uses a carrier aggregation technique and uses the first radiating portion and the second radiating portion to simultaneously receive or transmit wireless signals in a plurality of different frequency bands. Such as the antenna structure described in claim 6, wherein the wireless communication device The WIFI MIMO function is implemented using the second radiating portion and the third radiating portion. A wireless communication device comprising the antenna structure of any one of claims 1-10.