TWI743971B - Antenna structure and electronic device with same - Google Patents

Abstract

An antenna structure of an electronic device includes a metallic frame, a first feeding portion, a second feeding portion, and a ground portion. The metallic frame is made of metallic material. The metallic frame defines a first gap and a second gap. The metallic frame between the first and second gaps forms a first radiating portion. The first feeding portion is electrically connected to the first radiating portion for feeding current. The second feeding portion is spaced apart from the first feeding portion and is electrically connected to the first radiating portion for feeding current. The ground portion is positioned between the first and second feeding portions. The ground portion is electrically connected to the first radiating portion for grounding the first radiating portion.

Description

Antenna structure and electronic equipment with the antenna structure

The invention relates to an antenna structure and an electronic device with the antenna structure.

With the advancement of wireless communication technology, electronic devices such as mobile phones and personal digital assistants continue to develop toward the trend of diversified functions, thinner and lighter, and faster and more efficient data transmission. However, the space that can accommodate the antenna is getting smaller and smaller, and with the continuous development of wireless communication technology, the demand for 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 facing antenna design.

In view of this, it is necessary to provide an antenna structure and an electronic device with the antenna structure to solve the above-mentioned problems.

An antenna structure of an electronic device includes a metal frame, a first feeding portion, a second feeding portion, and a grounding portion. The metal frame is at least partially made of a metal material. The metal frame is provided with at least a first gap and a second gap. Gap, the metal frame between the first gap and the second gap forms a first radiating portion, and the first feeding portion is electrically connected to the first radiating portion and electrically connected to a first The feeding point is used to feed a current signal to the first radiating part, the second feeding part and the first feeding part are spaced apart, the second feeding part is electrically connected to the first radiating part, and Connected to a second feeding point to feed the current signal into the first radiating part No., the grounding portion is disposed between the first feeding portion and the second feeding portion, and is electrically connected to the first radiating portion, so as to provide a ground for the first radiating portion.

An electronic device including the above-mentioned antenna structure.

The above-mentioned antenna structure and the electronic device with the antenna structure are provided with the metal frame, and the antenna structure is divided from the housing by the gap on the metal frame, so that a broadband design can be effectively realized.

100: Antenna structure

11: shell

110: Metal frame

111: Backplane

112: Ground plane

113: middle frame

114: Clearance area

115: Part One

116: Part Two

117: Part Three

118: Slotting

120: The first gap

121: The second gap

122: The Third Gap

123: Slot

F1: The first radiation department

F2: The second radiating part

12: The first feed-in part

13: The second feed-in part

14: Grounding part

15: The third feed-in part

17: Adjustment Department

19: Switching circuit

19a, 19c: Single switch

a1, b1, c1, d1: moving contacts

a2, c2: static contact

19b, 19d: multiple switch

b2, d2: the first static contact

b3, d3: second static contact

191, 193: matching components

b4, d4: third fixed contact

b5, d5: fourth static contact

200: electronic equipment

201: display unit

202: The first feed point

203: second feed point

205: third feed point

FIG. 1 is a schematic diagram of the antenna structure of the preferred embodiment of the present invention applied to an electronic device.

FIG. 2 is a schematic diagram of the electronic device shown in FIG. 1 from another angle.

FIG. 3 is a schematic cross-sectional view taken along the line III-III in the electronic device shown in FIG. 1. FIG.

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

5A to 5D are circuit diagrams of the switching circuit in the antenna structure shown in FIG. 4.

Fig. 6 is a schematic diagram of the current flow when the antenna structure shown in Fig. 4 works.

Fig. 7 is a graph of S parameters (scattering parameters) of the antenna structure shown in Fig. 1 working in GPS mode and WIFI 2.4GHz mode.

Fig. 8 is a graph showing the total radiation efficiency of the antenna structure shown in Fig. 1 operating in the GPS mode and the WIFI 2.4GHz mode.

Fig. 9 is a graph of S parameter (scattering parameter) of the antenna structure shown in Fig. 1 operating in the WIFI 5GHz mode.

Fig. 10 is a diagram showing the total radiation efficiency of the antenna structure shown in Fig. 1 operating in the WIFI 5GHz mode.

Figure 11 shows the S parameters of the antenna structure shown in Figure 1 working in LTE-A low, medium and high frequency modes (Scattering parameter) graph.

Fig. 12 is a diagram showing the total radiation efficiency of the antenna structure shown in Fig. 1 operating in LTE-A low, medium and high frequency modes.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those with ordinary knowledge in the field without creative work shall fall within the protection 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 connected to the other element or a central element may also exist. 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 otherwise defined, all technical and scientific terms used in this article have the same meanings commonly understood by those with ordinary knowledge in the field. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

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

1 and 2, a preferred embodiment of the present invention provides an antenna structure 100, which can be applied to electronic devices 200 such as mobile phones, tablet computers, and personal digital assistants (personal digital assistants, PDAs) for transmitting, Receive radio waves to transmit and exchange wireless signals.

It is understandable that the electronic device 200 may use one or more of the following communication technologies: Bluetooth (BT) communication technology, global positioning system (GPS) communication technology, wireless fidelity (Wi-Fi) Communication technology, global system for mobile communications (GSM) communication technology, wideband code division multiple access (WCDMA) communication technology, long term evolution (LTE) communication technology, 5G communication Technology, SUB-6G communication technology and other future communication technologies.

Please also refer to FIG. 3, the electronic device 200 includes a housing 11 and a display unit 201. The housing 11 at least includes a metal frame 110, a back plate 111, a ground plane 112 and a middle frame 113.

The metal frame 110 has a substantially ring-shaped structure and is made of metal or other conductive materials. The back plate 111 is disposed on the edge of the metal frame 110. The back plate 111 may be made of metal or other conductive materials.

It can be understood that, in this embodiment, the metal frame 110 is provided with an opening (not labeled) on one side of the metal frame 110 opposite to the back plate 111 for accommodating the display unit 201. The display unit 201 has a display plane, and the display plane is exposed at the opening. It can be understood that the display unit 201 can be combined with a touch sensor to form a touch screen. The touch sensor can also be called a touch panel or a touch-sensitive panel.

It can be understood that, in this embodiment, the display unit 201 has a high screen-to-body ratio. That is, the area of the display plane of the display unit 201 is greater than 70% of the front area of the electronic device, and even a front full screen can be achieved. Specifically in this embodiment, the full screen means that, except for the necessary slots provided on the antenna structure 100, the left, right, and bottom sides of the display unit 201 can be seamlessly connected to the metal The border 110.

The ground plane 112 may be made of metal or other conductive materials. The ground plane 112 may be disposed in an accommodating space enclosed by the metal frame 110 and the back plate 111 (not shown).

The middle frame 113 is roughly in the shape of a rectangular sheet, which is made of metal or other conductive materials. The shape and size of the middle frame 113 may be slightly smaller than the ground plane 112. The middle frame 113 is stacked on the ground surface 112. In this embodiment, the middle frame 113 is a metal sheet disposed between the display unit 201 and the ground plane 112. The middle frame 113 is used to support the display unit 201, provide electromagnetic shielding, and improve the mechanical strength of the electronic device 200.

It can be understood that, in this embodiment, the metal frame 110, the back plate 111, the ground plane 112, and the middle frame 113 can form an integrally formed metal frame. The backplane 111, the ground plane 112, and the middle frame 113 are made of large-area metal, so they can jointly form the system ground plane of the antenna structure 100 (not shown in the figure). The system ground plane may be spaced apart from the metal frame 110 and electrically connected to the metal frame 110 through at least one connection point. For example, the metal frame 110 may be contacted and connected with the metal frame 110 by means of shrapnel, welding, probes, etc., to provide a ground for the antenna structure 100. It can be understood that, in this embodiment, the distance between the system ground plane and the metal frame 110 can be adjusted according to specific requirements. For example, the distance between the metal frame 110 and the system ground plane at different positions can be adjusted. Is equidistant or unequal distance.

In addition, it can be understood that, in this embodiment, since the system ground plane and the metal frame 110 are spaced apart, a corresponding clearance area 114 is formed between the two. For example, in one of the embodiments, the clearance area 114 may be formed by one of the backplane 111, the middle frame 113, and the ground plane 112, such as the middle frame 113 and the metal frame 110.

It can be understood that, in other embodiments, the electronic device 200 may further include the following One or more components, such as processors, circuit boards, memory, power components, input and output circuits, audio components (such as microphones and speakers, etc.), multimedia components (such as front camera and/rear camera), sensors Components (such as proximity sensors, distance sensors, ambient light sensors, acceleration sensors, gyroscopes, magnetic sensors, pressure sensors and/or temperature sensors, etc.), etc. Go into details again.

Please also refer to FIG. 4. The antenna structure 100 at least includes a frame, a first feeding portion 12, a second feeding portion 13, a grounding portion 14, a third feeding portion 15, an adjusting portion 17 and a switching circuit 19.

The frame body is at least partially made of metal material. In this embodiment, the frame is the metal frame 110 of the electronic device 200. The metal frame 110 at least includes a first part 115, a second part 116 and a third part 117. In this embodiment, the first part 115 is the top of the electronic device 200, that is, the first part 115 is the top metal frame of the electronic device 200, and the antenna structure 100 forms the top of the electronic device 200 antenna. The second part 116 and the third part 117 are disposed opposite to each other, and the two are respectively disposed at two ends of the first part 115, preferably vertically. In this embodiment, the length of the second part 116 or the third part 117 is greater than the length of the first part 115. That is, the second part 116 and the third part 117 are both side metal frames of the electronic device 200.

The metal frame 110 is also provided with a slot 118 and at least one gap. Wherein, the slot 118 is substantially U-shaped, and is entirely arranged on the first part 115 and extends in the direction of the second part 116 and the third part 117 respectively. In this embodiment, the metal frame 110 is provided with three slits, namely, a first slit 120, a second slit 121, and a third slit 122. Wherein, the first gap 120 is opened on the first portion 115. The second gap 121 is arranged on the second part 116. The third gap 122 is disposed on the third portion 117. The third gap 122 is farther away from the first gap 120 than the second gap 121.

In this embodiment, the first gap 120, the second gap 121, and the third gap 122 and the slot 118 pass through each other and separate the metal frame 110. The slot 118 and the at least one gap jointly divide at least two radiating parts from the metal frame 110. In this embodiment, the slot 118, the first gap 120, the second gap 121, and the third gap 122 jointly divide the first radiation portion F1 and the second radiation portion from the metal frame 110. Department F2. Wherein, in this embodiment, the metal frame 110 between the first gap 120 and the second gap 121 forms the first radiating portion F1. The metal frame 110 between the first gap 120 and the third gap 122 constitutes the second radiating portion F2.

In other words, the first radiating part F1 is disposed at a corner of the electronic device 200, that is, it is composed of a part of the first part 115 and a part of the second part 116. Two ends of the first radiating portion F1 connect the first gap 120 and the second gap 121 respectively. Two ends of the second radiating portion F2 connect the first slit 120 and the third slit 122 respectively. The electrical length of the second radiating portion F2 is greater than the electrical length of the first radiating portion F1.

Understandably, please refer to FIG. 1 again. Since the metal frame 110 is also provided with the slot 118, the slot 118 is moved from the side of the metal frame 110 close to the back plate 111 toward away from the The back plate 111 extends in a direction close to the display unit 201, so that the first radiating portion F1 and the second radiating portion F2 are completely formed by part of the metal frame 110. In this way, the slot 118 is sandwiched between the back plate 111 and the metal frame radiator, such as the first radiating portion F1 and the second radiating portion F2, so that the three (ie, the back plate) 111. The slot 118 and the metal frame radiator form a sandwich structure.

Understandably, please refer to FIG. 4 again. In this embodiment, a slot 123 is further provided inside the metal frame 110. The slot 123 is approximately U-shaped and communicates with the slot 118, the first slot 120, the second slot 121, and the third slot 122 to connect the first radiating portion F1, the The second radiating portion F2 is spaced apart from the middle frame 113 and insulated from each other. That is, in this embodiment, the slot 123 is used to separate the metal frame radiator (that is, the first radiating portion F1 and the second radiating portion F2) and the back plate 111. Of course, the slot 123 can also separate the metal frame radiator and the ground plane 112, and the metal frame 110, the back plate 111 and the ground plane other than the slot 123 112 is connected.

It can be understood that, in this embodiment, the slot 118, the first slot 120, the second slot 121, the third slot 122, and the slot 123 are all filled with insulating materials, such as plastic, rubber, Glass, wood, ceramics, etc., but not limited to this.

It can be understood that, in this embodiment, the width of the metal frame 110 is approximately 1 millimeter (mm) to 2 mm. The widths of the first slit 120, the second slit 121, and the third slit 122 can all be set to 1 mm-2 mm. The width of the slot 123 is set to be less than twice the width of the first slot 120, the second slot 121 and the third slot 122. Specifically, the width of the slot 123 can be set to 0.5mm-2mm.

It can be understood that, in this embodiment, the first feeding portion 12 is disposed inside the first radiating portion F1. Specifically, the first feeding portion 12 is disposed in the clearance area 114. One end of the first feeding portion 12 can be electrically connected to a first feeding point 202 by means of shrapnel, microstrip line, strip line, coaxial cable, etc., and the other end is electrically connected by a matching circuit (not shown). Connected to the first radiating part F1 to feed a current signal to the first radiating part F1.

The second feeding portion 13 is arranged inside the first radiating portion F1. Specifically, the second feeding portion 13 is disposed in the clearance area 114. One end of the second feeding portion 13 can be electrically connected to a second feeding point 203 by means of shrapnel, microstrip line, strip line, coaxial cable, etc., and the other end is electrically connected by a matching circuit (not shown). Connected to the first radiating part F1 to feed a current signal to the first radiating part F1.

In other words, in this embodiment, both the first feeding portion 12 and the second feeding portion 13 are electrically connected to the first radiating portion F1. Specifically, the first feeding portion 12 and the second feeding portion 13 are electrically connected to both sides of the first radiating portion F1, for example, the first feeding portion 12 is electrically connected to the first radiating portion F1. The part F1 is located in the part of the first part 115, and the second feeding part 13 is electrically connected to the part of the first radiating part F1 which is located in the second part 116.

The ground portion 14 is arranged inside the first radiating portion F1. Specifically, the grounding portion 14 is arranged in the clearance area 114. One end of the ground portion 14 can be electrically connected to the ground plane 112 by means of a shrapnel, microstrip line, strip line, coaxial cable, etc., that is, grounded, and the other end is electrically connected to the first radiating portion F1. The first radiating part F1 provides grounding.

It can be understood that, in this embodiment, the grounding portion 14 is disposed between the first feeding portion 12 and the second feeding portion 13. That is, the first feeding portion 12 is electrically connected to one end side of the first radiating portion F1, the second feeding portion 13 is electrically connected to the other end side of the first radiating portion F1, and The ground portion 14 is electrically connected between two ends of the first radiating portion F1.

The third feeding portion 15 is arranged inside the second radiating portion F2. Specifically, the third feeding portion 15 is disposed in the clearance area 114. Of the third feeding part 15 One end can be electrically connected to a third feeding point 205 by means of shrapnel, microstrip line, strip line, coaxial cable, etc., and the other end can be electrically connected to the second radiating part by a matching circuit (not shown) F2, to feed a current signal to the second radiating part F2. In this embodiment, the third feeding portion 15 is electrically connected to the first portion 115 of the second radiating portion F2 and is closer to the third gap 122 than the first gap 120.

It can be understood that, in this embodiment, the first feeding portion 12, the second feeding portion 13 and the third feeding portion 15 can all be made of iron parts, metal copper foil, and laser direct structuring (LDS) processes. The conductor and other materials are made.

The adjusting part 17 is arranged inside the second radiating part F2. Specifically, the adjusting portion 17 is arranged in the clearance area 114. One end of the adjusting part 17 can be electrically connected to the second radiating part F2 by means of elastic sheets, microstrip lines, strip lines, coaxial cables, etc., and the other end is electrically connected to the ground plane 112, that is, grounded. In this embodiment, the adjusting part 17 may be a middle/high band conditioner (MHC), which may be an inductor, a capacitor, or a combination thereof, for adjusting the middle/high frequency of the antenna structure 100 Frequency band, and effectively improve its bandwidth and antenna efficiency.

It can be understood that, in this embodiment, the adjusting portion 17 is closer to the third gap 122 than the third feeding portion 15. Specifically, in this embodiment, the adjusting portion 17 is disposed adjacent to the third gap 122.

In this embodiment, one end of the switching circuit 19 is electrically connected to the second radiating portion F2, and the other end is electrically connected to the ground plane 112, that is, grounded. It can be understood that, in this embodiment, the switching circuit 19 is arranged closer to the first gap 120 relative to the third feeding portion 15. Specifically, the switching circuit 19 is substantially electrically connected to the middle part of the second radiating part F2 Set. That is, the switching circuit 19 and the adjusting portion 17 are respectively arranged on both sides of the third feeding portion 15. The switching circuit 19 is used to switch the second radiating portion F2 to the ground plane 112 so that the second radiating portion F2 is not grounded, or to switch the second radiating portion F2 to a different ground Position (equivalent to switching to a different impedance element), thereby effectively adjusting the bandwidth of the antenna structure 100 to achieve the function of multi-frequency adjustment.

It can be understood that, in this embodiment, the specific structure of the switching circuit 19 can be in various forms, for example, it can include a single switch, a multiple switch, a single switch with matching components, a multiple switch with matching components, and so on.

Please also refer to FIG. 5A. In one of the embodiments, the switching circuit 19 includes a single switch 19a. The single-circuit switch 19a includes a movable contact a1 and a static contact a2. The movable contact a1 is electrically connected to the second radiating part F2. The static contact a2 of the single-circuit switch 19 a is electrically connected to the ground plane 112. In this way, by controlling the opening or closing of the single-circuit switch 19a, the second radiating portion F2 is electrically connected or disconnected from the ground plane 112, that is, the second radiating portion F2 is controlled to be grounded or not. Ground to achieve the function of multi-frequency adjustment.

Understandably, please also refer to FIG. 5B. In one of the embodiments, the switching circuit 19 includes a multiplexer 19b. In this embodiment, the multiplexer 19b is a four-way switch. The multiplexer 19b includes a moving contact b1, a first static contact b2, a second static contact b3, a third static contact b4, and a fourth static contact b5. The movable contact b1 is electrically connected to the second radiating part F2. The first stationary contact b2, the second stationary contact b3, the third stationary contact b4, and the fourth stationary contact b5 are electrically connected to different positions of the ground plane 112, respectively. By controlling the switching of the moving contact b1, the moving contact b1 can be switched to the first static contact b2, the second static contact b3, the third static contact b4, and the fourth static contact. Point b5. In this way, the second radiating part F2 will respectively It is electrically connected to different positions of the ground plane 112 to achieve the function of multi-frequency adjustment.

It is understandable that please also refer to FIG. 5C. In one of the embodiments, the switching circuit 19 includes a single switch 19c and a matching element 191. The single-circuit switch 19c includes a movable contact c1 and a static contact c2. The movable contact c1 is electrically connected to the second radiating part F2. The static contact c2 is electrically connected to the ground plane 112 through the matching element 191. The matching element 191 has a preset impedance. The matching element 191 may include an inductor, a capacitor, or a combination of an inductor and a capacitor.

Please also refer to FIG. 5D. In one of the embodiments, the switching circuit 19 includes a multiplexer 19d and at least one matching element 193. In this embodiment, the multiplexer 19d is a four-way switch, and the switching circuit 19 includes three matching elements 193. The multiplexer 19d includes a moving contact d1, a first static contact d2, a second static contact d3, a third static contact d4, and a fourth static contact d5. The movable contact d1 is electrically connected to the second radiating part F2. The first static contact d2, the second static contact d3, and the third static contact d4 are electrically connected to the ground plane 112 through corresponding matching elements 193, respectively. The fourth static contact d5 is suspended. Each matching element 193 has a predetermined impedance, and the predetermined impedance of the matching elements 193 may be the same or different. Each matching element 193 may include an inductor, a capacitor, or a combination of an inductor and a capacitor. The location where each matching element 193 is electrically connected to the ground plane 112 can be the same or different.

It can be understood that by controlling the switching of the movable contact d1, the movable contact d1 can be switched to the first stationary contact d2, the second stationary contact d3, the third stationary contact d4, and the first stationary contact d2, respectively. Four fixed contacts d5. In this way, the second radiating portion F2 will be electrically connected to or disconnected from the ground plane 112 through different matching elements 193, thereby achieving the function of multi-frequency adjustment.

Understandably, please also refer to FIG. 6, which is a current path diagram of the antenna structure 100. Wherein, when the current is fed from the first feeding part 12, the current will flow through the first radiating part F1, and then into the ground part 14 (reference path P1), thereby exciting a first working mode State to generate a radiation signal in the first radiation frequency band.

When the current is fed from the second feeding part 13, the current will also flow through the first radiating part F1, and then flow into the ground part 14 (reference path P2), thereby exciting a second operating mode In order to generate the radiation signal of the second radiation frequency band.

It can be understood that, in this embodiment, the second radiating portion F2 is a monopole antenna. When current is fed in from the third feeding part 15, the current will flow through the second radiating part F2, and respectively flow to the first slot 120 and the third slot 122 (refer to path P3), thereby exciting A third working mode is used to generate a radiation signal of the third radiation frequency band.

When the current is fed in from the third feeding part 15, the current will flow through the second radiating part F2, flow to the first gap 120, and then flow into the middle frame 113 and the back plate 111 , And then flow to the third gap 122, flow to the third feeding portion 15 (reference path P4) through the second radiating portion F2, and then excite a fourth working mode to generate a radiation signal of the fourth radiation frequency band .

When the current is fed in from the third feeding part 15, the current will flow through the second radiating part F2 and flow to the third gap 122 (reference path P5), thereby exciting a fifth working mode In order to generate the radiation signal of the fifth radiation frequency band.

In this embodiment, the first working mode includes a Global Positioning System (GPS) mode and a WIFI 2.4 GHz mode. The frequencies of the first radiation band include 1575MHz and 2400-2484MHz. The second working mode includes WIFI 5GHz Modal. The frequency of the second radiation band includes 5150-5850MHz. The third working mode is a low-frequency mode of Long Term Evolution Advanced (LTE-A). The frequency of the third radiation band includes 700-960MHz. The fourth working mode includes an LTE-A intermediate frequency mode. The frequency of the fourth radiation band includes 1710-2170MHz. The fifth working mode includes an LTE-A high frequency mode. The frequency of the fifth radiation band includes 2300-2690MHz.

Obviously, in this embodiment, the first radiating part F1 constitutes a GPS, WIFI 2.4G/5G antenna. The second radiating part F2 constitutes an LTE-A low, medium and high frequency antenna.

It can be understood that, in this embodiment, the first radiating portion F1 constitutes a multi-feed, such as a dual-feed common antenna structure. Two of the feeding portions, for example, the first feeding portion 12 and the second feeding portion 13 are provided on both sides of the first radiating portion F1, and the grounding portion is provided at an appropriate position of the first radiating portion F1 14. The GPS antenna, the WIFI 2.4G antenna and the WIFI 5G antenna can be fed into the same radiator at the same time, that is, the first radiating part F1, thereby generating the corresponding GPS frequency band, the WIFI 2.4G frequency band and the WIFI 5G frequency band.

In addition, by adjusting the position of the grounding portion 14, the first working mode and the second working mode can be effectively adjusted. For example, when the grounding portion 14 is close to the second feeding portion 13, the first operating mode and the second operating mode are separated far away. Conversely, when the grounding portion 14 is close to the first feeding portion 12, the first operating mode and the second operating mode are closer.

FIG. 7 is a graph of S parameters (scattering parameters) when the antenna structure 100 works in the GPS mode and the WIFI 2.4 GHz mode. Wherein, when the switching circuit 19 switches to an inductance value of 100nH, 40nH, 22nH, and 11nH, so that the low frequency of the antenna structure 100 is the LTE-A Band17 frequency band (704-746MHz), LTE-A Band13 frequency S11 value when the antenna structure 100 works in GPS mode and WIFI 2.4GHz mode when the antenna structure 100 works in the GPS mode and WIFI 2.4GHz mode Roughly the same.

FIG. 8 is a graph of the total radiation efficiency when the antenna structure 100 works in the GPS mode and the WIFI 2.4 GHz mode. Wherein, when the switching circuit 19 switches to an inductance value of 100nH, 40nH, 22nH, and 11nH, so that the low frequency of the antenna structure 100 is the LTE-A Band17 frequency band (704-746MHz), LTE-A In Band13 frequency band (746-787MHz), LTE-A Band20 frequency band (791-862MHz) and LTE-A Band8 frequency band (880-960MHz), the antenna structure 100 works in GPS mode and WIFI 2.4GHz mode. The radiation efficiency is about the same.

FIG. 9 is a graph of the S parameter (scattering parameter) when the antenna structure 100 works in the WIFI 5GHz mode. Wherein, when the switching circuit 19 switches to an inductance value of 100nH, 40nH, 22nH, and 11nH, so that the low frequency of the antenna structure 100 is the LTE-A Band17 frequency band (704-746MHz), LTE-A In Band13 frequency band (746-787MHz), LTE-A Band20 frequency band (791-862MHz) and LTE-A Band8 frequency band (880-960MHz), the S11 value of the antenna structure 100 when operating in the WIFI 5GHz mode is approximately the same.

FIG. 10 is a graph showing the total radiation efficiency of the antenna structure 100 when operating in the WIFI 5GHz mode. Wherein, when the switching circuit 19 switches to an inductance value of 100nH, 40nH, 22nH, and 11nH, so that the low frequency of the antenna structure 100 is the LTE-A Band17 frequency band (704-746MHz), LTE-A In Band13 frequency band (746-787MHz), LTE-A Band20 frequency band (791-862MHz) and LTE-A Band8 frequency band (880-960MHz), the total radiation efficiency of the antenna structure 100 when operating in the WIFI 5GHz mode is approximately the same.

FIG. 11 is a graph of S parameters (scattering parameters) when the antenna structure 100 works in LTE-A low, medium, and high frequency modes. Wherein, the curve S111 is S11 when the switching circuit 19 switches to an inductance with an inductance value of 100nH, and the antenna structure 100 operates in the LTE-A Band17 frequency band (704-746MHz) and LTE-A mid- and high-frequency modes. value. The curve S112 is the S11 value when the switching circuit 19 switches to an inductance value of 40 nH, and the antenna structure 100 works in the LTE-A Band 13 frequency band (746-787 MHz) and the LTE-A mid- and high-frequency modes. The curve S113 is the S11 value of the antenna structure 100 when the switching circuit 19 switches to an inductance value of 22nH when the antenna structure 100 operates in the LTE-A Band20 frequency band (791-862MHz) and the LTE-A mid- and high-frequency modes. The curve S114 is the S11 value of the antenna structure 100 when the switching circuit 19 switches to an inductance value of 11nH when the antenna structure 100 operates in the LTE-A Band8 frequency band (880-960MHz) and the LTE-A mid- and high-frequency modes.

FIG. 12 is a graph showing the total radiation efficiency of the antenna structure 100 when operating in the LTE-A low, medium, and high frequency modes. Wherein, the curve S121 is the total of the antenna structure 100 when the switching circuit 19 switches to an inductance with an inductance value of 100nH when the antenna structure 100 operates in the LTE-A Band17 frequency band (704-746MHz) and the LTE-A mid- and high-frequency modes Radiation efficiency. Curve S122 is the total radiation efficiency of the antenna structure 100 when the switching circuit 19 switches to an inductance of 40 nH when the antenna structure 100 operates in the LTE-A Band 13 frequency band (746-787 MHz) and LTE-A mid- and high-frequency modes . Curve S123 is the total radiation efficiency of the antenna structure 100 when the switching circuit 19 is switched to an inductance value of 22nH when the antenna structure 100 operates in the LTE-A Band20 frequency band (791-862MHz) and the LTE-A mid- and high-frequency modes . Curve S124 is the total radiation efficiency of the antenna structure 100 when the switching circuit 19 switches to an inductance value of 11nH when the antenna structure 100 operates in the LTE-A Band8 frequency band (880-960MHz) and LTE-A mid- and high-frequency modes .

Obviously, it can be seen from FIGS. 7 to 12 that the antenna structure 100 is provided with the switching circuit 19 to switch the low-frequency modes of the antenna structure 100, which can effectively increase the low-frequency bandwidth and have the best performance. Good antenna efficiency. Furthermore, when the antenna structure 100 works in the LTE-A Band17 frequency band (704-746MHz), the LTE-A Band13 frequency band (746-787MHz), the LTE-A Band20 frequency band (791-862MHz) and the LTE-A Band8 frequency band, respectively (880-960MHz), the LTE-A middle and high frequency bands of the antenna structure 100 are both 1710-2690MHz, and the antenna structure 100 can also cover the corresponding GPS frequency band, WIFI 2.4GHz frequency band and WIFI 5GHz Frequency band. That is, when the switching circuit 19 is switched, the switching circuit 19 is only used to change the low-frequency mode of the antenna structure 100 without affecting the middle and high-frequency modes, that is, when the low-frequency band is switched, both GPS and WIFI 2.4 are covered. With multiple frequency bands such as GHz and WIFI 5GHz, this feature is conducive to LTE-A carrier aggregation (Carrier Aggregation, CA).

In other words, the antenna structure 100 can generate various operating modes, such as low-frequency mode, intermediate-frequency mode, high-frequency mode, GPS mode, and WIFI 2.4GHz mode through the switching of the switching circuit 19 And WIFI 5GHz mode, covering the communication frequency band commonly used in the world. Specifically, the antenna structure 100 can cover GSM850/900/WCDMA Band5/Band8/Band13/Band17/Band20 at low frequencies, GSM 1800/1900/WCDMA 2100 (1710-2170MHz) at intermediate frequencies, and LTE- A Band7, Band40, Band41 (2300-2690MHz), it can also cover GPS frequency band, Wi-Fi 2.4GHz frequency band and Wi-Fi 5GHz frequency band. The designed frequency band of the antenna structure 100 can be applied to the operation of GSM Qual-band, UMTS Band I/II/V/VIII frequency bands, and LTE 850/900/1800/1900/2100/2300/2500 frequency bands commonly used in the world.

Of course, it can be understood that in other embodiments, the switching circuit 19 is not limited to It is electrically connected to the second radiating part F2, and its position can be adjusted according to specific requirements. For example, the switching circuit 19 may be electrically connected to the first radiation part F1.

It can be understood that the position of the connection point between the system ground plane and the metal frame 110 can be adjusted according to the required low-frequency frequency. For example, when the connection point is close to the third feeding portion 15, the connection point can be adjusted accordingly. Makes its low frequency shift to high frequency. On the contrary, it shifts to low frequency.

In addition, the slot 118, the first slot 120, the second slot 121, and the third slot 122 in the antenna structure 100 are all disposed on the metal frame 110, but not on the back plate 111. The back plate 111 is an integrally formed single metal sheet, so that the back plate 111 constitutes an all-metal structure. That is, there is no gap between the back plate 111 and the metal frame 110, and there is no slot, disconnection or break point for dividing the insulation of the back plate 111 on the back plate 111, so that the The back plate 111 can prevent the integrity and aesthetics of the back plate 111 from being affected by the arrangement of slots, disconnections or break points.

In summary, the antenna structure 100 of the present invention is provided with at least one slot (for example, the first slot 120, the second slot 121, and the third slot 122) on the metal frame 110, so that at least Two radiating parts. The antenna structure 100 is also provided with the switching circuit 19, which can cover multiple frequency bands such as low frequency, intermediate frequency, high frequency, GPS, Wi-Fi 2.4GHz and Wi-Fi 5GHz by different switching methods, and As a result, the radiation of the antenna structure 100 has a wider frequency effect than that of a general metal back cover antenna. The antenna structure 100 can increase the low frequency bandwidth and have better antenna efficiency, covering the requirements of global frequency band applications and CA applications. In addition, it is understandable that the antenna structure 100 of the present invention has a front full-screen, and the antenna structure 100 still has good performance in the unfavorable environment where the all-metal back plate 111, the metal frame 110 and a large amount of metal surround it. .

The above are only 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 according to the spirit of the present invention should all be included in the scope of protection claimed by the present invention.

112: Ground plane

113: middle frame

120: The first gap

121: The second gap

122: The Third Gap

123: Slot

F1: The first radiation department

F2: The second radiating part

12: The first feed-in part

13: The second feed-in part

14: Grounding part

15: The third feed-in part

17: Adjustment Department

19: Switching circuit

202: The first feed point

203: second feed point

205: third feed point

Claims (10)

An antenna structure of an electronic device. The improvement is that the antenna structure includes a metal frame, a first feeding portion, a second feeding portion, a third feeding portion, and a grounding portion. The metal frame is at least partially made of a metal material. The metal frame is provided with at least a first gap, a second gap, and a third gap. The metal frame between the first gap and the second gap forms a first radiating portion, and the first gap and The metal frame between the third gaps forms a second radiating portion, and the first feeding portion is electrically connected to the first radiating portion and electrically connected to a first feeding point for the second radiating portion. A radiating part feeds a current signal, the second feeding part is spaced apart from the first feeding part, and the second feeding part is electrically connected to the first radiating part and electrically connected to a second feeding point , To feed a current signal to the first radiating portion, and the third feeding portion to be electrically connected to the second radiating portion, and to a third feeding point, to feed current to the second radiating portion Signal, the grounding portion is disposed between the first feeding portion and the second feeding portion, and is electrically connected to the first radiating portion, so as to provide a ground for the first radiating portion. The antenna structure according to claim 1, wherein when current is fed from the first feeding part, the current flows through the first radiating part and is grounded by the grounding part to excite the GPS mode And the WIFI 2.4GHz mode; when the current is fed from the second feeding part, the current flows through the first radiating part and is grounded by the grounding part to excite the WIFI 5GHz mode. The antenna structure according to claim 1, wherein the GPS mode and the WIFI 2.4GHz mode and the WIFI 5GHz mode are adjusted by adjusting the position of the ground portion. The antenna structure according to claim 1, wherein the third slot is farther from the first slot than the second slot. The antenna structure according to claim 4, wherein the metal frame at least includes a first part, a second part, and a third part, and the second part and the third part are respectively connected To both ends of the first part, the lengths of the second part and the third part are both greater than the length of the first part, the first gap is opened in the first part, and the second gap is opened in In the second part, the third slit is opened in the third part, and the second slit is symmetrically arranged with the third slit. The antenna structure according to claim 1, wherein the antenna structure further includes a switching circuit, one end of the switching circuit is electrically connected to the second radiating part, and the other end is grounded to adjust the radiation of the second radiating part frequency. The antenna structure according to claim 1, wherein when current is fed from the third feeding part, the second radiating part excites LTE-A low, medium, and high frequency modes. The antenna structure according to claim 7, wherein the antenna structure further includes an adjustment part, the adjustment part is a mid- and high-frequency regulator, one end of the adjustment part is electrically connected to the second radiating part, and the other end is grounded, It is used to adjust the middle and high frequency bands of the second radiating part. An electronic device, wherein the electronic device includes the antenna structure according to any one of claims 1 to 8. The electronic device according to claim 9, wherein the electronic device further includes a display unit and a back plate, the display unit is accommodated in an opening on one side of the metal frame, the display unit is a full screen, the The back plate is a single piece of metal that is integrally formed. The back plate is directly connected to the metal frame. There is no gap between the back plate and the metal frame. Slotting, disconnection or breaking point of the insulation of the backplane.

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