TWI758973B - Antenna structure and electronc device with same - Google Patents

Abstract

An antenna structure includes a side frame, a first feed portion, and a second feed portion. The side frame is made of metallic material. The side frame at least defines a first gap and a second gap. The first gap and the second gap cooperatively divide the side frame into a first radiation portion and a second radiation portion. The first feed portion is electrically connected to the first radiation portion for feeding current to the first radiation portion. The second feed portion is electrically connected to the second radiation portion for feeding current to the second radiation portion. When the first and second feed portions feed current, the first and second radiation portions generate at least one same radiation frequency band. The at least one same radiation frequency band includes LTE-A middle and high frequency bands.

Description

Antenna structure and electronic equipment having the same

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

With the advancement of wireless communication technology, electronic devices such as mobile phones and personal digital assistants are constantly developing towards the trend of diversification of 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 bandwidth requirement of the antenna is increasing. Therefore, how to design an antenna with a wider bandwidth in a limited space is an important issue faced by the antenna design.

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

An antenna structure of an electronic device includes a frame, a first feeding portion and a second feeding portion, the frame is at least partially made of a metal material, at least a first slot and a second slot are opened on the frame, and the first The slot and the second slot together define a first radiating part and a second radiating part from the frame, the first feeding part is electrically connected to the first radiating part, and is electrically connected to a first feeding point to feed a current signal to the first radiating part, the second feeding part is electrically connected to the second radiating part, and is electrically connected to a second feeding point to feed the second radiating part A current signal, when the first feeding part and the second feeding part respectively feed current, the first radiating part and the second radiating part produce At least one identical radiation frequency band is generated, wherein the at least one identical radiation frequency band is the LTE-A medium and high frequency frequency bands.

An electronic device includes the above-mentioned antenna structure.

The above-mentioned antenna structure and the electronic device having the antenna structure are provided with the first slot and the second slot to form the first radiating portion and the second radiating portion, the first radiating portion and the first radiating portion. The two radiation parts can generate at least one same radiation frequency band to meet the MIMO characteristics and have a broadband effect.

100, 100a: Antenna structure

11: Shell

110: Border

111, 111a: Backplane

112: Ground plane

113: Middle frame

114: Clearance area

115: Part 1

116: Part II

117: Part Three

120, 120a: the first gap

121, 121a: Second slit

123: slotted hole

F1, F1a: the first radiation part

F2, F2a: the second radiation part

12: The first feed-in section

13: Second feed-in

14: The first switching circuit

14a, 14c: One-way switch

a1, b1, c1, d1: moving contacts

a2, c2: static contact

14b, 14d: Multiplexer

b2, d2: the first static contact

b3, d3: the second static contact

141, 143: Matching components

b4, d4: the third static contact

b5, d5: the fourth static contact

15: Second switching circuit

F3: The third radiation department

16: The third feed-in

17: Grounding

18: Adjustment Department

200, 200a: Electronic equipment

201: Display unit

202: First feed point

203: Second feed point

205: Third feed point

FIG. 1 is a schematic diagram of the application of the antenna structure of the preferred embodiment of the present invention 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 along line III-III of the electronic device shown in FIG. 1 .

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 is in operation.

FIG. 7 is a graph showing the S-parameter (scattering parameter) of the antenna structure shown in FIG. 1 .

FIG. 8 is a diagram of the total radiation efficiency of the antenna structure shown in FIG. 1 .

FIG. 9 is a schematic diagram of an antenna structure according to a second preferred embodiment of the present invention.

FIG. 10 is a schematic diagram of the current flow when the antenna structure shown in FIG. 9 is in operation.

FIG. 11 is a graph showing the S-parameter (scattering parameter) of the antenna structure shown in FIG. 9 .

FIG. 12 is a graph showing the total radiation efficiency of the antenna structure shown in FIG. 9 .

The technical solutions in the embodiments of the present invention will be clearly and completely described below 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, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those with ordinary knowledge in the art 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 on the other element or an intervening element may also be present. When an element is said to be "electrically connected" to another element, it can be a contact connection, eg, by means of a wire connection, or a contactless connection, eg, by a contactless coupling.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention.

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

Please refer to FIG. 1 and FIG. 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, personal digital assistants (PDAs), etc., for transmitting, Receive radio waves to transmit and exchange wireless signals.

It can be understood that the electronic device 200 may adopt one or more of the following communication technologies: Bluetooth (bluetooth, BT) communication technology, global positioning system (global positioning system, GPS) communication technology, wireless fidelity (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 (long term evolution, LTE) communication technology, 5G communication technology, SUB-6G communication technology and other communication technologies in the future.

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

The frame 110 is generally in the form of an annular structure, which is made of metal or other conductive materials. The back plate 111 is disposed on the edge of the frame 110 . The back plate 111 can be made of metal or other conductive materials.

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

It can be understood that in this embodiment, the display unit 201 has a high screen ratio. That is, the area of the display plane of the display unit 201 is larger 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 refers to that the left side, the right side and the lower side of the display unit 201 can be connected to the frame without gaps except for the necessary slots formed on the antenna structure 100 . 110.

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

The middle frame 113 is generally 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 plane 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 for supporting the display unit 201 , providing electromagnetic shielding, and improving the mechanical strength of the electronic device 200 .

It can be understood that, in this embodiment, the 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 large-area metals, so they can jointly form a system ground plane (not shown) of the antenna structure 100 . The system ground plane may be spaced apart from the frame 110 and electrically connected to the frame 110 through at least one connection point. For example, the frame 110 can be contacted and connected to the frame 110 by means of elastic sheets, welding, probes, etc., so as to provide grounding for the antenna structure 100 . It can be understood that in this embodiment, the distance between the system ground plane and the frame 110 can be adjusted according to specific requirements. For example, the distance between the frame 110 and the system ground plane at different positions can be equal. distance or not.

In addition, it can be understood that, in this embodiment, since the system ground plane and the frame 110 are spaced apart, a corresponding clearance area 114 is formed therebetween. For example, in one embodiment, 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 frame 110 .

It can be understood that in other embodiments, the electronic device 200 may further include one or more of the following elements, such as a processor, a circuit board, a memory, a power supply element, an input and output circuit, and an audio element (such as a microphone and a speaker, etc.) , multimedia components (such as front camera and/rear camera), sensor components (such as proximity sensor, distance sensor, ambient light sensor, acceleration sensor, gyroscope, magnetic sensor, pressure sensor and/or temperature sensor, etc.), etc., which will not be repeated here.

Please also refer to FIG. 4 , the antenna structure 100 at least includes a frame body, a first feeding part 12 , a second feeding part 13 , a first switching circuit 14 and a second switching circuit 1415 .

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

At least one slit is also defined on the frame 110 . Wherein, in this embodiment, the frame 110 is provided with two slits, namely the first slit 120 and the second slit 121 . Wherein, the first slit 120 is opened on the first portion 115 . The second slit 121 is formed on the second portion 116 . The first slit 120 is closer to the third portion 117 than the second portion 116 .

It can be understood that, in this embodiment, the at least one slit jointly defines at least two radiating portions from the frame 110 . In this embodiment, the first slit 120 and the second slit 121 together define a first radiation portion F1 and a second radiation portion F2 from the frame 110 . The frame 110 between the first slit 120 and the second slit 121 forms the first radiation portion F1. The first slit 120 and the third portion 117 together constitute the second radiation portion F2. The first radiation portion F1 is composed of part of the first part 115 and part of the second part 116 . Two ends of the first radiation portion F1 are respectively connected to the first slit 120 and the second slit 121 . The second radiation portion F2 is disposed at a corner of the electronic device 200 . One end of the second radiating portion F2 is connected to the first slit 120 , and the other end is disposed at the third portion 117 and connected to the back plate 111 . In this embodiment, the electrical length of the second radiation portion F2 is smaller than the electrical length of the first radiation portion F1.

It can be understood that, referring to FIG. 4 again, in this embodiment, the inner side of the frame 110 is further provided with a slot 123 . The slot 123 is substantially U-shaped, and is connected to the first slit 120 and the second slit 121 are communicated with each other, and are used to separate and insulate the first radiating part F1 and the second radiating part F2 from the system ground plane, such as the middle frame 113 . That is to say, in this embodiment, the slot hole 123 is used to separate the frame radiator (ie, 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 frame radiator and the ground plane 112 , and in the part other than the slot 123 , the frame 110 , the back plate 111 and the ground plane 112 are connected.

It can be understood that in this embodiment, the first slit 120 , the second slit 121 and the slot hole 123 are filled with insulating materials, such as plastic, rubber, glass, wood, ceramics, etc. limited.

It can be understood that, in this embodiment, the width of the first slit 120 and the width of the second slit 121 can be set to 1 mm-2 mm. The width of the slot hole 123 is set to be less than twice the width of the first slit 120 and the second slit 121 . Specifically, the width of the slot hole 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 elastic sheets, microstrip lines, strip lines, coaxial cables, etc., and the other end is electrically connected to the first radiating portion F1, to feed a current signal to the first radiating portion F1. It can be understood that, in this embodiment, the first feeding portion 12 is closer to the second slot 121 than the first slot 120 .

The second feeding portion 13 is disposed inside the second radiating portion F2. 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 elastic sheets, microstrip lines, strip lines, coaxial cables, etc., and the other end is electrically connected to the second radiating portion F2, to feed a current signal to the second radiation portion F2. In this implementation In an example, the second feeding portion 13 is electrically connected to the first portion 115 of the second radiating portion F2 , and is closer to the first slot 120 than the first feeding portion 12 .

In this embodiment, one end of the first switching circuit 14 is electrically connected to the first radiation portion F1 , and the other end is electrically connected to the system ground plane, such as the ground plane 112 , that is, ground. It can be understood that, in this embodiment, the first switching circuit 14 is disposed closer to the second slot 121 than the first feeding portion 12 . That is to say, in this embodiment, the first switching circuit 14 is disposed between the second slot 121 and the first feeding portion 12 . Specifically, the first switching circuit 14 is substantially electrically connected to an end of the first radiation portion F1 close to the second slot 121 . The first switching circuit 14 is used for switching the first radiating part F1 to the system ground plane, so that the first radiating part F1 is not grounded, or switching the first radiating part F1 to a different The grounding position (equivalent to switching to different impedance elements) can effectively adjust 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 first switching circuit 14 can be in various forms, for example, it can include a single-channel switch, a multi-channel switch, a single-channel switch with a matching element, a multiple-channel switch with a matching element, and the like.

Please also refer to FIG. 5A , in one embodiment, the first switching circuit 14 includes a one-way switch 14a. The one-way switch 14a includes a movable contact a1 and a stationary contact a2. The movable contact a1 is electrically connected to the second radiation portion F2. The static contact a2 of the one-way switch 14a is electrically connected to the ground plane 112 . In this way, by controlling the opening or closing of the one-way switch 14a, the first radiating portion F1 is electrically connected or disconnected from the ground plane 112, that is, the first radiating portion F1 is controlled to be grounded or not. Ground to achieve the function of multi-frequency adjustment.

Understandably, please refer to FIG. 5B , in one embodiment, the first switching Circuit 14 includes multiplexer 14b. In this embodiment, the multiplexer 14b is a four-way switch. The multiplexer 14b includes a movable contact b1, a first stationary contact b2, a second stationary contact b3, a third stationary contact b4 and a fourth stationary contact b5. The movable contact b1 is electrically connected to the first radiation portion F1. The first stationary contact b2 , the second stationary contact b3 , the third stationary contact b4 and the fourth stationary contact b5 are respectively electrically connected to different positions of the ground plane 112 . By controlling the switching of the movable contact b1, the movable contact b1 can be switched to the first stationary contact b2, the second stationary contact b3, the third stationary contact b4 and the fourth stationary contact respectively. point b5. In this way, the first radiation portion F1 will be electrically connected to different positions of the ground plane 112 respectively, thereby achieving the function of multi-frequency adjustment.

It can be understood that, referring to FIG. 5C , in one embodiment, the first switching circuit 14 includes a one-way switch 14 c and a matching element 141 . The one-way switch 14c includes a movable contact c1 and a stationary contact c2. The movable contact c1 is electrically connected to the first radiation portion F1. The stationary contact c2 is electrically connected to the ground plane 112 through the matching element 141 . The matching element 141 has a predetermined impedance. The matching element 141 may include inductance, capacitance, or a combination of inductance and capacitance.

Please also refer to FIG. 5D , in one embodiment, the first switching circuit 14 includes a multiplexer 14d and at least one matching element 143 . In this embodiment, the multiplexer 14d is a four-way switch, and the switching circuit 19 includes three matching elements 143 . The multiplexer 14d includes a movable contact d1, a first stationary contact d2, a second stationary contact d3, a third stationary contact d4 and a fourth stationary contact d5. The movable contact d1 is electrically connected to the first radiation portion F1. The first stationary contact d2 , the second stationary contact d3 and the third stationary contact d4 are electrically connected to the ground plane 112 through corresponding matching elements 143 , respectively. The fourth static contact d5 is set in the air. Each matching element 143 has a predetermined impedance, and the predetermined impedances of the matching elements 143 may be the same or different. Each matching element 143 may include an inductance, a capacitance, or a combination of an inductance and capacitance. Each matching element 143 is electrically connected to the ground The positions of the surfaces 112 may 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 respectively switched to the first stationary contact d2, the second stationary contact d3, the third stationary contact d4 and the first stationary contact d4. Four static contacts d5. In this way, the first radiation portion F1 will be electrically connected to the ground plane 112 or disconnected from the ground plane 112 through different matching elements 143 , thereby achieving the function of multi-frequency adjustment.

It can be understood that, in this embodiment, one end of the second switching circuit 15 is electrically connected to the first radiating portion F1 , and the other end is electrically connected to the system ground plane, ie, grounding. In this embodiment, the second switching circuit 15 is disposed closer to the first slot 120 than the first feeding portion 12 . That is to say, in this embodiment, the second switching circuit 15 is disposed between the first slot 120 and the first feeding portion 12 , and is further away from the first switching circuit 14 than the first switching circuit 14 The first feeding part 12 is provided. In this embodiment, the circuit structure and working principle of the second switching circuit 15 are similar to those of the first switching circuit 14 , and details are not described herein again.

It can be understood that please refer to FIG. 6 , which is a current path diagram of the antenna structure 100 . The first radiation portion F1 is a monopole antenna. When the current is fed from the first feeding part 12, the current will flow through the first radiating part F1 and flow to the first slit 120 (refer to the path P1), thereby exciting a first working mode to generate the radiation signal of the first radiation frequency band.

When the current is fed from the first feeding part 12 , the current will flow through the first radiating part F1 , and flow to the first slot 120 , then flow to the second slot 121 , and then flow into the The middle frame 113 and the backplane 111 (refer to the path P2 ) further excite a second working mode to generate a radiation signal of a second radiation frequency band.

When the current is fed from the first feeding part 12 , the current will flow through the first radiating part F1 and flow to the second slit 121 (refer to the path P3 ), thereby exciting a third working mode to produce The radiation signal of the third radiation frequency band is generated.

In this embodiment, the second radiation portion F2 is a loop antenna. When the current is fed from the second feeding part 13, the current will flow through the second radiating part F2, and then flow into the middle frame 113 and the backplane 111 (see path P4), thereby exciting a The fourth working mode is used to generate the radiation signal of the fourth radiation frequency band.

In this embodiment, the first working mode is a Long Term Evolution Advanced (Long Term Evolution Advanced, LTE-A) low frequency mode. The frequency of the first radiation band includes 700-960 MHz. The second working mode includes an ultra-middle frequency (UMB) mode, an LTE-A intermediate frequency mode, and an LTE-A high frequency mode. The frequencies of the second radiation band include 1427-1518MHz, 1710-2170MHz and 2300-2690MHz. The third working mode includes an ultra-high frequency (UHB) mode, a 5G N78 mode and a 5G N79 mode. The frequencies of the third radiation band include 3300-3800MHz and 4400-5000MHz. The fourth working mode includes an LTE-A intermediate frequency mode and an LTE-A high frequency mode. The frequencies of the fourth radiation band include 1710-2170MHz and 2300-2690MHz.

Obviously, in this embodiment, the first radiation portion F1 constitutes an LTE-A low, medium, high frequency, ultra-intermediate frequency, ultra-high frequency, 5G N78, and N79 antennas. The second radiation part F2 constitutes an LTE-A medium and high frequency antenna. That is to say, the first radiation portion F1 and the second radiation portion F2 have at least one common radiation frequency band, and the radiation frequency bands of the two overlap. For example, both the first radiation portion F1 and the second radiation portion F2 can generate radiation frequency bands of 1710-2170 MHz and 2300-2690 MHz. In this way, the electronic device 200 can implement a multiple input multiple output (Multiple Input Multiple Output, MIMO) function. For example, when the electronic device 200 is provided with a corresponding upper antenna on the top thereof, the electronic device 200 can be enabled to support 4*4 MIMO.

It can be understood that, in one embodiment, the first feeding portion 12 and the second feeding portion 13 can be made of iron, metal copper foil, conductors in a laser direct structuring (LDS) process, etc. become.

It can be understood that in handheld electronic devices, the optimized detuned antenna is designed to have the maximum radiation efficiency in various frequency bands, and its main characteristic is to tune the antenna performance, so that the frequency of the antenna is significantly shifted. Therefore, in one embodiment, the first feed-in portion 12 and/or the second feed-in portion 13 may be configured as capacitors, inductors, or a combination thereof, that is, the first feed-in portion 12 and/or the second feed-in portion 12 The two feeding portions 13 can be replaced by capacitors, inductors, or a combination thereof. By electrically connecting one end of the first feed-in portion 12 and/or the second feed-in portion 13 to the system ground plane, that is, grounding, the other end is electrically connected to the first radiating portion F1 and/or the other end. The second radiation part F2 is described. In this way, the antenna structure 100 can have better tuning performance, and the isolation effect of the antenna structure 100 can be more excellent.

FIG. 7 is a graph showing the S-parameter (scattering parameter) of the antenna structure 100 . The curve S71 is the S11 value of the first radiation portion F1 when the antenna structure 100 is not detuned. The curve S72 is the S11 value of the first radiation portion F1 when the antenna structure 100 is detuned. The curve S73 is the S11 value of the second radiation portion F2 when the antenna structure 100 is not detuned. The curve S74 is the S11 value of the second radiation portion F2 when the antenna structure 100 is detuned.

FIG. 8 is a graph showing the total radiation efficiency of the antenna structure 100 . The curve S81 is the total radiation efficiency of the first radiation portion F1 when the antenna structure 100 is not detuned. Curve S82 is the total radiation efficiency of the first radiation portion F1 when the antenna structure 100 is detuned. Curve S83 is the total radiation efficiency of the second radiation portion F2 when the antenna structure 100 is not detuned. Curve S84 is performed for the antenna structure 100 In the detuned design, the total radiation efficiency of the second radiation portion F2.

Obviously, as can be seen from FIG. 7 and FIG. 8 , when the first feeding part 12 and/or the second feeding part 13 are replaced by capacitors, inductors or their combinations, the antenna structure 100 can obtain better tuning ( Detuned) performance, and has better isolation effect. Furthermore, the high-isolation antenna structure 100 can effectively improve the mid-to-high frequency bandwidth and antenna efficiency, and has MIMO characteristics at the same time. The frequency of the antenna structure 100 covers low, medium, high frequency, ultra-intermediate frequency, ultra-high frequency, 5G N78 and 5G N79 frequency bands, and greatly improves its bandwidth and antenna efficiency, and can also cover applications in global frequency bands, and supports Carrier Aggregation (CA) requirements for LTE-A.

That is, the antenna structure 100 can generate various operating modes, such as a low frequency mode, an intermediate frequency mode, a high frequency mode, an ultra-intermediate frequency mode, an ultra-high frequency mode, a 5G N78 mode, and a 5G N79 mode. , covering the communication frequency bands 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), UHF covers 1427-1518MHz, UHF covers 3400-3800MHz, and the new 5G spectrum range includes N78 (3300-3800MHz) and N79 (4400-5000MHz). The design frequency band of the antenna structure 100 can be applied to the operation of GSM Qual-band, UMTS Band I/II/V/VIII frequency band, and LTE 850/900/1800/1900/2100/2300/2500 frequency band commonly used in the world.

In addition, the first slot 120 and the second slot 121 in the antenna structure 100 are both disposed on the frame 110, that is, not disposed on the back plate 111, the back plate 111 is a single metal sheet integrally formed, The back plate 111 is made to form an all-metal structure. That is, there is no gap between the backplane 111 and the frame 110 , and there is no insulation for dividing the backplane 111 on the backplane 111 . Slots, broken lines or broken points can prevent the back plate 111 from affecting the integrity and aesthetics of the back plate 111 due to the arrangement of the slots, broken lines or broken points.

To sum up, in the antenna structure 100 of the present invention, at least one slot (eg, the first slot 120 and the second slot 121 ) is disposed on the frame 110 to define at least two radiating portions from the frame 110 . The antenna structure 100 is also provided with the first switching circuit 14 and the second switching circuit 15, so that it can cover low frequency, medium frequency, high frequency, super medium frequency, ultra high frequency, 5G N78 through different switching methods. and N79 and other frequency bands, and make the radiation of the antenna structure 100 more broadband than the general metal back cover antenna and have better antenna efficiency, covering the requirements of global frequency band applications and CA applications, and has MIMO characteristics. . Furthermore, the antenna structure 100 can obtain better tuning performance and better isolation effect. In addition, it can be understood 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 with the all-metal backplane 111 , the frame 110 and a large amount of metal around.

Please also refer to FIG. 9 , which is an antenna structure 100a provided by a second preferred embodiment of the present invention, which can be applied to electronic equipment 200a such as mobile phones and personal digital assistants for transmitting and receiving radio waves for transmission and exchange. wireless signal.

The antenna structure 100 a at least includes a frame 110 , a backplane 111 a , a ground plane 112 , a middle frame 113 , a first feeding portion 12 , a second feeding portion 13 , a first switching circuit 14 and a second switching circuit 15 . The frame 110 is provided with a first slit 120 a and a second slit 121 a to define a first radiating portion F1 a and a second radiating portion F2 a from the frame 110 .

It can be understood that, in this embodiment, the difference between the antenna structure 100a and the antenna structure 100 is that the back plate 111a is made of insulating materials such as glass.

It can be understood that in this embodiment, the area between the antenna structure 100a and the antenna structure 100 The difference is that the positions of the first slit 120a and the second slit 121a on the frame 110 are different from the positions of the first slit 120 and the second slit 121 on the frame 110 in the first embodiment . Specifically, the first slit 120 a is opened in the first part 115 and is disposed close to the second part 116 . The second slit 121 a is opened in the third portion 117 . In this way, the first radiation portion F1a is composed of part of the first part 115 and part of the third part 117 . Two ends of the first radiation portion F1a are respectively connected to the first slit 120a and the second slit 121a. The second radiation portion F2a is composed of part of the first part 115 and part of the second part 116 . One end of the second radiating portion F2a is connected to the first slot 120a, and the other end is disposed on the second portion 116 and is electrically connected to the ground plane 112 .

It can be understood that, in this embodiment, the difference between the antenna structure 100 a and the antenna structure 100 is that the antenna structure 100 a further includes a third feeding portion 16 . The first slit 120a and the second slit 121a also jointly define a third radiation portion F3 from the frame 110 . The third radiation portion F3 is formed by the frame 110 between the second slit 121 a and the end of the slot 123 corresponding to the third portion 117 . The third radiating part F3 and the second radiating part F2a are disposed on both sides of the first radiating part F1a at intervals. One end of the third radiating portion F3 is connected to the second slot 121a, and the other end thereof is connected to the system ground plane, ie, ground.

The third feeding portion 16 is disposed inside the third radiating portion F3. Specifically, the third feeding portion 16 is disposed in the clearance area 114 . One end of the third feeding portion 16 can be electrically connected to a third feeding point 205 by means of elastic sheets, microstrip lines, strip lines, coaxial cables, etc., and the other end is electrically connected to the third radiating portion F3, to feed a current signal to the third radiating portion F3. In this embodiment, the third feeding portion 16 is electrically connected to the third portion 117 of the third radiating portion F3, and is disposed on both sides of the second slot 121a with the first switching circuit 14, respectively. .

It can be understood that, please refer to FIG. 10 together. In this embodiment, the working principles and specific working frequency bands of the first radiating portion F1a and the second radiating portion F2a are related to the first radiating portion F1 and the first radiating portion F1 and the antenna structure 100. The working principle and specific working frequency band of the second radiating part F2 are the same, that is, the first radiating part F1a can work in LTE-A low frequency, medium frequency, high frequency, ultra-intermediate frequency, ultra-high frequency, 5G N78 frequency band and 5G N79 frequency band . The second radiating portion F2a can work in the LTE-A medium and high frequency bands, and details are not described herein again. And when the current is fed from the third feeding part 16, the current will flow through the third radiating part F3 and flow to the backplane 111, the ground plane 112 and the middle frame 113 (see path P5). ), and then excite the third working mode to generate a radiation signal of a third radiation frequency band.

It can be understood that, in this embodiment, the difference between the antenna structure 100 a and the antenna structure 100 is that the antenna structure 100 a further includes a grounding portion 17 and an adjusting portion 18 . The grounding portion 17 is disposed inside the second radiating portion F2. Specifically, the grounding portion 17 is disposed in the clearance area 114 . One end of the grounding portion 17 can be electrically connected to the system ground plane, ie, ground, by means of elastic sheets, microstrip lines, strip lines, coaxial cables, etc., and the other end is electrically connected to the second radiating portion F2a, so that the The second radiation portion F2a provides grounding.

It can be understood that, in this embodiment, the grounding portion 17 is disposed at the end of the second radiation portion F2a corresponding to the slot 123 at the end of the second portion 116 , that is, is disposed at the second radiation portion The portion F2a is away from the end of the first slit 120a.

The adjusting portion 18 is disposed inside the third radiating portion F3. Specifically, the adjusting portion 18 is disposed in the clearance area 114 . One end of the adjusting portion 18 can be electrically connected to the third radiating portion F3 by means of elastic sheets, microstrip lines, strip lines, coaxial cables, etc., and the other end is electrically connected to the system ground plane, ie, grounding. In this embodiment, the adjusting part 18 may be a middle/high band conditioner (MHC), which may be an inductor, a capacitor or a combination thereof, for adjusting the The middle and high frequency bands of the antenna structure 100a can be adjusted, and the bandwidth and antenna efficiency thereof can be effectively improved. In this embodiment, the adjusting portion 18 is further away from the second slit 121 a than the third feeding portion 16 .

It can be understood that, in this embodiment, the positions where the grounding portion 17 and the adjusting portion 18 are connected to the system grounding plane can be adjusted according to the required frequency. For example, when its connection position is close to the corresponding second feed-in part 13 and/or the third feed-in part 16 , its frequency can be shifted to high frequency, and conversely, its frequency can be shifted to low frequency.

FIG. 11 is a graph showing the S-parameter (scattering parameter) of the antenna structure 100a. The curve S111 is the value of S11 of the first radiation portion F1a when the antenna structure 100a is not detuned. The curve S112 is the S11 value of the first radiation portion F1a when the antenna structure 100a is detuned. The curve S113 is the S11 value of the second radiation portion F2a when the antenna structure 100a is not detuned. The curve S114 is the S11 value of the second radiation portion F2a when the antenna structure 100a is detuned. The curve S115 is the S11 value of the third radiation portion F3 when the antenna structure 100a is not detuned. The curve S116 is the S11 value of the third radiation portion F3 when the antenna structure 100a is detuned.

FIG. 12 is a graph showing the total radiation efficiency of the antenna structure 100a. The curve S121 is the total radiation efficiency of the first radiation portion F1a when the antenna structure 100a is not detuned. The curve S122 is the total radiation efficiency of the first radiation portion F1a when the antenna structure 100a is detuned. Curve S123 is the total radiation efficiency of the second radiation portion F2a when the antenna structure 100a is not detuned. The curve S124 is the total radiation efficiency of the second radiation portion F2a when the antenna structure 100a is detuned. Curve S125 is the third radiation when the antenna structure 100a is not detuned. The total radiation efficiency of part F3. The curve S126 is the total radiation efficiency of the third radiating portion F3 when the antenna structure 100a is detuned.

Obviously, similar to the antenna structure 100 in the first embodiment, the antenna structure 100a can form at least three independent radiating portions by providing a plurality of slots, such as the first slot 120 and the second slot 121 . Among them, the first radiation part F1 can excite LTE-A low, medium, high frequency, ultra-intermediate frequency, ultra-high frequency, 5G N78/N79 modes (covering frequency ranges 700-960MHz, 1427-1518MHz, 1710-2170MHz, 2300MHz -2690MHz, 3300-3800MHz and 4400-5000MHz). The second radiation portion F2 can excite the LTE-A medium and high frequency modes (covering frequency ranges of 1710-2170 MHz and 2300-2690 MHz). The third radiating part F3 can excite UHF, 5G N78 and N79 modes (frequency coverage ranges of 3300-3800MHz and 4400-5000MHz), thereby effectively improving bandwidth and antenna efficiency, and having MIMO characteristics.

The above descriptions 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 within the scope of the claimed protection of the present invention.

111: Backplane

112: Ground plane

113: Middle frame

120: The first gap

121: Second gap

123: slotted hole

F1: The first radiation department

F2: The second radiation part

12: The first feed-in section

13: Second feed-in

14: The first switching circuit

15: Second switching circuit

202: First feed point

203: Second feed point

Claims (10)

An antenna structure of an electronic device is improved in that the antenna structure includes a frame, a first feeding portion and a second feeding portion, the frame is at least partially made of a metal material, and at least a first slot and a A second slot, the first slot and the second slot together define a first radiating part, a second radiating part and a third radiating part from the frame, the first slot and the second slot are The frame between them constitutes the first radiating part, the second radiating part and the third radiating part are arranged on both sides of the first radiating part at intervals, and one end of the second radiating part is connected to the The first slot has the other end grounded, one end of the third radiating portion is connected to the second slot, and the other end is grounded, the first feeding portion is electrically connected to the first radiating portion, and is electrically connected to a a first feeding point for feeding a current signal to the first radiating part, the second feeding part being electrically connected to the second radiating part and electrically connected to a second feeding point for the second feeding part The radiating part feeds a current signal, and when the first feeding part and the second feeding part feed current respectively, the first radiating part and the second radiating part generate at least one same radiation frequency band, wherein , the at least one same radiation frequency band is the LTE-A medium and high frequency frequency bands. The antenna structure of claim 1, wherein when a current is fed from the first feeding part, the first radiating part excites LTE-A low, medium, high frequency, ultra-intermediate frequency, ultra-high frequency, 5G N78/N79 mode; when the current is fed from the second feeding part, the second radiating part excites the LTE-A medium and high frequency modes. The antenna structure according to claim 1 or 2, further comprising a third feeding portion, the third feeding portion is electrically connected to the third radiating portion, and is electrically connected to a third feeding point, In order to feed a current signal to the third radiating part, when the third radiating part feeds a current, the third radiating part generates an ultra-high frequency, 5G N78/N79 mode. The antenna structure of claim 3, wherein the frame includes at least a first part, a second part and a third part, the second part and the third part are respectively connected to two ends of the first part, and the The lengths of the second part and the third part are both greater than the length of the first part, the first slit is opened in the first part, and the second slit is opened in the second part or the third part part. The antenna structure of claim 1, wherein the antenna structure further comprises a first switching circuit and a second switching circuit, and the first switching circuit and the second switching circuit are disposed on two sides of the first feeding portion On the other hand, one end of the first switching circuit and the second switching circuit are both electrically connected to the first radiation portion, and the other ends are both grounded, so as to adjust the radiation frequency of the first radiation portion. The antenna structure of claim 1, wherein the antenna structure further comprises a grounding portion, one end of the grounding portion is electrically connected to an end of the second radiating portion away from the first slot, and the other end is grounded, by The position of the grounding portion is adjusted to adjust the frequency of the second radiating portion. The antenna structure according to claim 3, wherein the antenna structure further comprises an adjustment part, the adjustment part is a medium and high frequency adjuster, one end of the adjustment part is electrically connected to the third radiation part, and the other end is grounded, It is used to adjust the middle and high frequency frequency bands of the antenna structure. The antenna structure as claimed in claim 1, wherein a slot hole is further formed inside the frame, and the slot hole and the first slot and the second slot pass through each other. An electronic device, which is improved in that the electronic device comprises claims 1 to The antenna structure described in any one of 8. The electronic device according to claim 9, wherein the electronic device further comprises a display unit and a back panel, the display unit is accommodated in an opening on one side of the frame, the display unit is a full screen, the back panel is The board is a single piece formed in one piece, the back board is directly connected to the frame, there is no gap between the back board and the frame, and there is no partition on the back board for dividing the back board. Slots, breaks or breaks in insulation.

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