CN218975788U

CN218975788U - Antenna assembly and electronic equipment

Info

Publication number: CN218975788U
Application number: CN202223048556.7U
Authority: CN
Inventors: 曹廷友
Original assignee: Realme Chongqing Mobile Communications Co Ltd
Current assignee: Realme Chongqing Mobile Communications Co Ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-05-05
Anticipated expiration: 2032-11-14

Abstract

The application provides an antenna assembly and electronic equipment, including NFC chip, NFC coil and commentaries on classics body radiator. The NFC chip comprises a connecting end; one end of the NFC coil is electrically connected with the connecting end; the common radiator comprises a first connecting point and a second connecting point, wherein the first connecting point is electrically connected with the other end of the NFC coil, and the second connecting point is grounded or electrically connected with the connecting end. The application provides an antenna assembly capable of reducing the number of devices of an NFC antenna system and occupied space and cost and electronic equipment with the antenna assembly.

Description

Antenna assembly and electronic equipment

Technical Field

The application relates to the technical field of communication, in particular to an antenna assembly and electronic equipment.

Background

With the rapid development of the communication industry, the level of wireless communication technology is increasing, the 4G network is already mature, and the 5G technology is also slowly moving to us. With the continuous penetration of wireless communication technology, short-range wireless communication technology is coming into the spotlight of rapid development. At present, mobile phones are indispensable devices in life of everyone, and along with the continuous rapid increase of uplink and downlink data transmission rates of wireless communication, applications of mobile phones are also changing day by day. The NFC antenna is one of various antenna forms, and has wide application in the aspects of mobile payment, electronic ticketing, entrance guard, mobile identity recognition, anti-counterfeiting, wireless charging and the like. The mobile phone has a plurality of internal devices and extremely limited internal space, so that the technical problem to be solved is how to reduce the number of devices of the NFC antenna system, occupied space and cost.

Disclosure of Invention

The application provides an antenna assembly capable of reducing the number of devices of an NFC antenna system and occupied space and cost and electronic equipment with the antenna assembly.

In a first aspect, the present application provides an antenna assembly comprising:

the NFC chip comprises a connecting end;

an NFC coil, wherein one end of the NFC coil is electrically connected with the connecting end; and

The common radiator comprises a first connecting point and a second connecting point, wherein the first connecting point is electrically connected with the other end of the NFC coil, and the second connecting point is grounded or electrically connected with the connecting end.

In a second aspect, an electronic device provided by the present application includes a middle frame and an antenna assembly, where the NFC chip and the NFC coil are located in an area surrounded by the middle frame, and a common radiator of the antenna assembly is located at a top of the middle frame and/or a portion on a side edge of the middle frame, which is close to the top.

The antenna assembly and the electronic equipment provided by the application comprise a connecting end through setting up the NFC chip, the one end electricity of NFC coil is connected the connecting end, the common body radiator includes first connecting point and second tie point, first connecting point electricity is connected the other end of NFC coil, the second tie point ground connection or electricity are connected the connecting end, when realizing NFC communication, because NFC chip single-ended connection is in NFC coil, then the device between NFC chip single-ended and the NFC coil reduces, has saved NFC antenna's device quantity to and space, the cost that reduces to occupy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below.

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

fig. 2 is a schematic structural splitting diagram of an electronic device according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a first antenna assembly according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a second antenna assembly according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a first antenna assembly with a first antenna unit according to an embodiment of the present application;

fig. 6 is a detailed structural schematic diagram of the antenna assembly provided in fig. 4;

fig. 7 is a schematic view of a first detailed construction of the antenna assembly provided in fig. 3;

fig. 8 is a schematic view of a second detailed construction of the antenna assembly provided in fig. 3;

fig. 9 is a schematic diagram of the antenna assembly provided in fig. 3 with a first isolation circuit;

fig. 10 is a schematic structural diagram of the antenna assembly provided in fig. 3 with a first isolation circuit and a second isolation circuit;

fig. 11 is a detailed structural schematic diagram of the antenna assembly provided in fig. 10;

fig. 12 is a schematic structural diagram of an antenna assembly provided in an embodiment of the present application and having a second antenna unit and a third antenna unit.

Reference numerals illustrate:

an electronic device 1; an antenna assembly 10; a display screen 20; a middle frame 30; a rear cover 40; a middle plate 31; a frame 32; an NFC chip 11; an NFC coil 12; a common radiator 13; a connection end 111; a first connection point A; a second connection point B; a main board 50; a top edge 321; a bottom edge 322; a first side 323; a second side 324; a first signal terminal 112; the second signal terminal 113; a connection circuit 114; a feed 15; a second matching circuit M2; a first antenna unit 161; a first radiator 162; a first isolation circuit F1; a second isolation circuit F2; a first antenna unit ANT1; a second antenna unit ANT2; and a third antenna unit ANT3.

Detailed Description

The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. It is apparent that the embodiments described herein are only some embodiments, not all embodiments. All other embodiments, which can be made by a person of ordinary skill in the art based on the embodiments provided herein without any inventive effort, are within the scope of the present application.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will appreciate explicitly and implicitly that the embodiments described herein may be combined with other embodiments.

The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example: an assembly or device incorporating one or more components is not limited to the listed one or more components, but may alternatively include one or more components not listed but inherent to the illustrated product, or one or more components that may be provided based on the illustrated functionality.

At present, a common NFC antenna system adopts double-end feeding, specifically, an NFC chip includes two pins, and the two pins are electrically connected with two ends of an NFC coil respectively. Each matching circuit takes up a certain space and increases the cost of the device.

Referring to fig. 1 and 2, an antenna assembly 10 for reducing the number of devices of an NFC antenna system and reducing occupied space and cost and an electronic device 1 having the antenna assembly 10 are provided.

The antenna assembly 10 includes an NFC antenna system. The NFC antenna system is an antenna for wireless communication by a near field communication technology. Near field communication (Near Field Communication, NFC) technology is a short-range wireless communication technology that allows contactless point-to-point data transfer and exchange of data between electronic devices. Near field communication plays a great role in the fields of access control, public transportation, mobile phone payment and the like.

When the antenna assembly 10 is mounted on the electronic device 1, the electronic device 1 can realize electronic payment, read information of other NFC devices or tags, realize functions of data exchange and service, and the like. The electronic device 1 includes, but is not limited to, a mobile phone, a smart wearable device (e.g., a smart watch, etc.), a computer, a digital camera, a PDA, etc. In addition, NFC antenna systems may also operate between a mobile device and certain target devices. Such as a sales terminal system of a store checkout counter, a tag device incorporating a near field communication chip, etc. The electronic device 1 provided by the application can be an initiating device or a target device.

Referring to fig. 1 and 2, an operation environment of the antenna assembly 10 is illustrated by taking the electronic device 1 as an example of a mobile phone. The electronic apparatus 1 includes a display screen 20, a center 30, and a rear cover 40, which are disposed in this order in the thickness direction. The middle frame 30 includes a middle plate 31 and a frame 32 surrounding the middle plate 31. The display screen 20, the middle plate 31 and the rear cover 40 are sequentially stacked, and an accommodating space is formed between the display screen 20 and the middle plate 31 and between the middle plate 31 and the rear cover 40 to accommodate devices such as a main board, a camera module, a receiver module, a battery, various sensors and the like. One side of the frame 32 is connected to an edge of the display 20, and the other side of the frame 32 is connected to an edge of the rear cover 40, so as to form a complete appearance structure of the electronic device 1. In the embodiment, the frame 32 and the middle plate 31 are in a split structure, and the frame 32 and the rear cover 40 can be in a split structure. In other embodiments, the frame 32 and the middle plate 31 are separate structures, and the frame 32 and the rear cover 40 may be an integral structure.

Referring to fig. 2, the length direction of the electronic apparatus 1 is defined as the Y-axis direction, the width direction is defined as the X-axis direction, and the thickness direction is defined as the Z-axis direction.

Referring to fig. 3, the antenna assembly 10 includes an NFC chip 11, an NFC coil 12, and a common radiator 13.

The NFC chip 11 includes a connection terminal 111. Optionally, the connection terminal 111 is a pin. The NFC chip 11 is a radio frequency transceiver chip for exciting to generate NFC resonance.

One end of the NFC coil 12 is electrically connected to the connection terminal 111. Specifically, NFC coil 12 includes, but is not limited to, an FPC coil. The NFC coil 12 extends from the FPC with two terminals. One terminal is electrically connected to the connection end 111 of the NFC chip 11, and a specific electrical connection manner includes, but is not limited to, soldering, and the like. The NFC coil 12 is part of the radiator of the NFC antenna system.

The co-body radiator 13 comprises a first connection point a and a second connection point B. The first connection point a is electrically connected to the other end of the NFC coil 12, and the second connection point B is grounded or electrically connected to the connection terminal 111. The common radiator 13 is another part of the radiator of the NFC antenna system.

The material of the co-emitter 13 is a conductive material, including but not limited to a metal, an alloy, a conductive oxide, a conductive polymer, graphene, etc.

The co-body radiator 13 is connected in series with said NFC coil 12 to function as a radiator of the NFC antenna system, and furthermore the co-body radiator 13 may also function as a conductive structure of the electronic device 1 for other purposes. For example, the common radiator 13 may be a radiator of another antenna, the common radiator 13 may support a common radiator of two antennas at the same time, the common radiator 13 may support a plurality of frequency band resonances at the same time, and the total size of the radiators of the two antennas is reduced compared with the case that the radiators of the two antennas are independently arranged due to multiplexing of the common radiator 13. Of course, in other embodiments, the common radiator 13 may also be a conductive shielding case in the electronic device 1, where the common radiator 13 may not only be a part of a radiator of the NFC antenna system, but also be a shielding case of an electronic device of the electronic device 1, so as to implement multiplexing of the shielding case. Of course, in other embodiments, the common radiator 13 may also be a metal support plate of the camera module, and the common radiator 13 may not only be a part of the radiator of the NFC antenna system, but also be a metal support plate of the camera module, so as to implement multiplexing of the metal support plate of the camera module.

The common radiator 13 is taken as an example of a radiator of an NFC antenna system and other antennas (e.g. cellular antennas) below.

Alternatively, the shape of the common radiator 13 is not particularly limited in this application. For example, the shape of the common radiator 13 includes, but is not limited to, a strip, a sheet, a plate, a rod, a coating, a film, and the like. The co-emitter 13 shown in fig. 3 is only an example and is not intended to limit the shape of the co-emitter 13 provided herein. In this embodiment, the common radiator 13 is in a strip shape. The extending track of the co-body radiator 13 is not limited in this application. In this embodiment, the common radiator 13 has a meander shape. In other embodiments, the common radiator 13 may extend along a straight line, a curved line, or the like. The above-mentioned common radiator 13 may be a line with a uniform width on the extending track, or may be a bar with a gradual change in width and a widening area, etc.

Alternatively, the specific shape of the co-emitter 13 is not specifically limited in this application. The common radiator 13 includes, but is not limited to, a metal bezel 32 for a mobile phone, a metal frame embedded in the plastic bezel 32, and the metal common radiator 13 located in or on the bezel 32. The common body radiator 13 is provided in the electronic device 1, and includes, but is not limited to, a flexible circuit board radiator formed on a flexible circuit board (Flexible Printed Circuit board, FPC), a laser direct structuring radiator formed by laser direct structuring (Laser Direct Structuring, LDS), a printed direct structuring radiator formed by printing direct structuring (Print Direct Structuring, PDS), a conductive sheet radiator (e.g., a metal bracket radiator), and the like. In this embodiment, the common radiator 13 is exemplified by a metal frame 32 of a mobile phone.

The specific type of the other antenna where the common radiator 13 is located is not limited in the present application, for example, the common radiator 13 may be an IFA antenna, a PIFA antenna, a LOOP antenna, a monopole antenna, a dipole antenna, or the like. In this embodiment, the common radiator 13 is taken as an IFA antenna as an example, and the structure of the common radiator 13 is illustrated below with reference to the drawings.

Referring to fig. 3, the common radiator 13 includes a free end 131, a first connection point a, and a second connection point B, which are sequentially disposed. Wherein the free end 131 is an end disconnected from the rest of the metal bezel 32. The second connection point B may be a position on the common radiator 13 or the other end of the common radiator 13. In this embodiment, the second connection point B is a point on the common radiator 13.

In an alternative embodiment, referring to fig. 3, the second connection point B is grounded. The term "ground" as used herein refers to electrically connected to the reference ground or the reference ground system GND, and the electrical connection manner includes, but is not limited to, direct soldering, or indirect electrical connection by means of coaxial lines, microstrip lines, conductive spring plates, conductive adhesives, etc. The reference ground system GND may be a single integral structure or a plurality of structures that are independent of each other but electrically connected to each other. In this embodiment, the mg-al alloy structure of the middle plate 31 of the mobile phone is referred to the ground. The second connection point B is grounded and electrically connected to the reference ground through a grounding spring plate.

The first connection point a is located between the free end 131 and the second connection point B. The first connection point a is a position on the common radiator 13 where the NFC coil 12 is electrically connected. The position of the first connection point a between the free end 131 and the second connection point B is not specifically limited in this application.

When the common radiator 13 also serves as a radiator for other antennas, the first connection point a may or may not be a feeding point.

In this embodiment, the current path of the NFC antenna system is: the NFC chip 11 transmits a radio frequency current to the NFC coil 12 through the connection terminal 111, and the radio frequency current flows through the NFC coil 12, the first connection point a of the common radiator 13, and the second connection point B of the common radiator 13 back to ground, so as to form a current loop.

In an alternative embodiment, referring to fig. 4, the second connection point B is electrically connected to the connection terminal 111. I.e. the second connection point B may be electrically connected to the connection terminal 111 of the NFC chip 11 by means of the first electrical connection line 14.

Optionally, the electrical connection between the second connection point B and the first electrical connection line 14 includes, but is not limited to, direct soldering, or indirect electrical connection via coaxial lines, microstrip lines, conductive clips, conductive adhesives, etc. The second connection point B is electrically connected to one end of the first electrical connection line 14 through the conductive spring. The other end of the first electrical connection line 14 is soldered to the connection terminal 111 of the NFC chip 11.

In this embodiment, the current path of the NFC antenna system is: the NFC chip 11 transmits a radio frequency current to the NFC coil 12 through the connection terminal 111, and the radio frequency current flows through the NFC coil 12, the first connection point a of the common radiator 13, the second connection point B of the common radiator 13, and the first electrical connection line 14 back to the connection terminal 111 of the NFC chip 11, so as to form a current loop.

The second connection point B is electrically connected to the connection end 111 of the NFC chip 11 through the first electrical connection line 14, so that an area surrounded by the radiator of the NFC antenna system is larger, an effective area of the NFC function is as large as possible, and the NFC antenna system can be flexibly used in multiple postures during use.

NFC chip 11 in this application excites through single-ended feed's mode and produces NFC resonance, then NFC chip 11 only need all the way matching circuit electricity connect NFC coil 12, compares in NFC chip 11 double-ended feed mode, has saved all the way matching circuit.

The antenna assembly 10 and the electronic device 1 provided by the application, through setting up NFC chip 11 and including link 111, the one end electricity of NFC coil 12 is connected link 111, the common body radiator 13 includes first tie point A and second tie point B, first tie point A electricity is connected the other end of NFC coil 12, second tie point B ground connection or electricity are connected link 111 realizes NFC communication in the time, because NFC chip 11 single-ended connection is in NFC coil 12, then the device between NFC chip 11 single-ended and the NFC coil 12 reduces, has saved NFC antenna system's device quantity to and space, the cost that reduces to occupy.

Referring to fig. 5, the electronic device 1 includes a motherboard 50. The NFC chip 11 is disposed on the motherboard 50. The NFC coil 12 is an FPC radiator. The NFC coil 12 is disposed between the motherboard 50 and the back cover 40. The NFC coil 12 and the NFC chip 11 are both located in the area surrounded by the middle frame 30.

Generally, the NFC coil 12 is mainly concentrated on the back of the mobile phone, and the NFC performance of the top/front of the mobile phone is weak or even not due to the shielding of the metal front shell of the display 20/the metal supporting plate of the display 20, so that the user needs to use the mobile phone in a fixed posture, which is inconvenient.

The common radiator 13 of the NFC antenna system provided in this embodiment may be disposed in the frame 32 of the middle frame 30, or in an accommodating space formed by the middle frame 30 and the rear cover 40, or in an accommodating space formed by the display screen 20 and the middle frame 30, or the like, and of course, the common radiator 13 of the NFC antenna system may also be disposed in or on the display screen 20, on the surface of the middle frame 30, on the surface of the rear cover 40, or integrated with the rear cover 40. Through the position of the common radiator 13 is flexibly arranged, the position of the NFC function on the mobile phone can be increased, the NFC function is not required to be used by adopting a fixed posture, and the flexibility of using the NFC function is improved.

Alternatively, the common radiator 13 of the NFC antenna system may be disposed on the frame 32 of the middle frame 30. The position of the common radiator 13 on the center 30 is not particularly limited in this application. Specifically, the rim 32 of the middle frame 30 includes a top side 321 and a bottom side 322 disposed opposite to each other, and a first side 323 and a second side 324 connected between the top side 321 and the bottom side 322. And corners are arranged between the adjacent edges.

Optionally, the common radiator 13 of the NFC antenna system is disposed on the top of the middle frame 30 and/or a portion of the side edge of the middle frame near the top, so that the back, top, and side surfaces of the electronic device 1 have NFC functions. Further, the common radiator 13 of the NFC antenna system is bent. A part of the common radiator 13 of the NFC antenna system is disposed on the top edge 321 of the middle frame 30, and another part of the common radiator 13 of the NFC antenna system is disposed on the first side edge 323 of the middle frame 30, so that the back, top and first side edges 323 of the electronic device 1 all have NFC functions, and a user can use the NFC functions in various postures.

Optionally, referring to fig. 5, the common radiator 13 of the NFC antenna system is disposed on top of the middle frame 30, so that the back and top of the electronic device 1 have NFC functions. Further, the common radiator 13 of the NFC antenna system is bent. A part of the common radiator 13 of the NFC antenna system is disposed on the top edge 321 of the middle frame 30, and another part of the common radiator 13 of the NFC antenna system is disposed on the second side edge 324 of the middle frame 30, so that the back, top and second side edges 324 of the electronic device 1 all have NFC functions, and a user can use the NFC functions in multiple postures.

In other embodiments, the common radiator 13 of the NFC antenna system is disposed on the first side 323 or the second side 324 or the bottom side 322 of the middle frame 30, so that the first side 323 or the second side 324 or the bottom of the electronic device 1 has NFC function.

Referring to fig. 6, the connection terminal 111 includes a first signal terminal 112, a second signal terminal 113, and a connection circuit 114 connected between the first signal terminal 112 and the second signal terminal 113, wherein the connection circuit 114 may be a combination of shorting and grounding between the first signal terminal 112 and the second signal terminal 113. The connection circuit 114 in fig. 6 is a simplified structure, and does not represent that the connection circuit 114 is only one electrical connection line.

Specifically, the first signal terminal 112 and the second signal terminal 113 are two pins of the NFC chip 11. The two pins are electrically connected by a connection circuit 114. In other words, two pins of the NFC chip 11 are integrated.

To facilitate connection molding, the first signal terminal 112 is electrically connected to one end of the NFC coil 12, and the second connection point B is electrically connected to the second signal terminal 113. The connection between the one end of the NFC coil 12 and the second connection point B is separated, so that the one end of the NFC coil 12 and the second connection point B are firmly connected to the NFC chip 11 and do not affect each other.

Referring to fig. 7, the antenna assembly 10 further includes a first matching circuit M1. The first matching circuit M1 is electrically connected between the connection terminal 111 and one end of the NFC coil 12. The first matching circuit M1 is configured to adjust an impedance of the radiator of the NFC antenna system, so that the impedance of the radiator of the NFC antenna system is better matched with the NFC frequency band, so as to generate a resonance mode of the NFC frequency band, and the antenna has better radiation performance in the NFC frequency band. Optionally, the first matching circuit M1 includes a circuit structure formed by a plurality of elements such as a capacitor, an inductor, and a resistor.

Referring to fig. 8, the antenna assembly 10 further includes a feed 15 and a second matching circuit M2. The second matching circuit M2 is electrically connected between the feed 15 and the first connection point a. The feed source 15 is used for exciting the common radiator 13 to transmit and receive target radio frequency signals.

The frequency band of the target radio frequency signal is not specifically limited in the application. Optionally, the target radio frequency signal includes, but is not limited to, a 2G, 3G, 4G, 5G band of a mobile cellular signal, and specifically includes, but is not limited to, any one band or any multi-band combination of a 4G LB band, a 4G MB band, a 5G LB band, a 5G MB band, a 5G HB band, a WIFI band, and a GPS band.

Optionally, the frequency Band of the target radio frequency signal is not limited, and can be LMH Band, and the frequency range is 600MHz-2690MHz; or MH band+N78, with frequency range of 1700-3800MHz.

The target radio frequency signal is used for receiving and transmitting the LMH frequency band, and the frequency range is 600MHz-2690 MHz.

Specifically, referring to fig. 8, the electronic device 1 further includes a first antenna unit 161. The first antenna unit 161 includes the above-described feed source 15, the second matching circuit M2, and the first radiator 162. Alternatively, the common radiator 13 is a part or all of the first radiator 162.

The feed source 15 is a radio frequency transceiver chip. The second matching circuit M2 is configured to adjust the impedance of the radiator of the first antenna unit 161, so that the impedance of the radiator of the first antenna unit 161 is better matched with the LMH band, so as to generate a resonance mode of the LMH band, and the radiation performance in the LMH band is better. Optionally, the second matching circuit M2 includes a circuit structure formed by a plurality of elements such as a capacitor, an inductor, and a resistor.

Optionally, the second connection point B is grounded. Optionally, in the first antenna unit 161, the second connection point B on the first radiator 162 needs to be grounded. Then, after the first radiator 162 is used as the common radiator 13, the NFC antenna loop can be formed by using the second connection point B originally grounded in the first antenna unit 161, and no additional grounding spring is required.

Optionally, in the first antenna unit 161, the second connection point B on the first radiator 162 does not need to be grounded. The antenna assembly 10 further includes a first filter circuit, wherein one end of the first filter circuit is electrically connected to the second connection point B, and the other end of the first filter circuit is grounded. And the first filter circuit is a band-stop circuit of the LMH frequency band, the first filter circuit is equivalent to an open circuit for the LMH frequency band, the first filter circuit is a band-pass circuit of the NFC frequency band, and the first filter circuit is equivalent to a short circuit for the NFC frequency band. Optionally, the first filter circuit is an inductor.

By arranging the first filter circuit, the NFC radio frequency current is grounded at the second connection point B, and the receiving and transmitting of LMH radio frequency signals are not affected.

Alternatively, the first connection point a may be the feeding point of the first radiator 162 in the first antenna unit ANT1, or may not be the feeding point of the first radiator 162 in the first antenna unit ANT 1.

Optionally, the first connection point a is a feeding point of the first radiator 162 in the first antenna unit ANT 1. The other end of the NFC coil 12 is electrically connected between the first connection point a and the second matching circuit M2. Therefore, the other end of the NFC coil 12 and the second matching circuit M2 can be electrically connected to the same feeding spring, so that the number of spring pieces required to be set can be reduced, and occupied space can be saved.

In other embodiments, the first connection point a is a position of the non-feeding point of the first radiator 162 in the first antenna unit ANT1, so that the flexibility of the position of the first connection point a is higher.

It can be appreciated that the space enclosed by the radiator of the NFC antenna system has better NFC performance. Therefore, the first connection point a can be close to the free end 131, so that the space enclosed by the common radiator 13 and the NFC coil 12 is as large as possible, and the effective area of the NFC function is as large as possible.

By designing the length of the radiator between the first connection point a and the second connection point B, the length of the NFC coil 12 and the first matching circuit M1, the radiator of the NFC antenna system generates NFC resonance.

Referring to fig. 9, the antenna assembly 10 further includes a first isolation circuit F1. One end of the first isolation circuit F1 is electrically connected to the other end of the NFC coil 12, and the other end of the first isolation circuit F1 is electrically connected to the first connection point a. The first isolation circuit F1 is configured to conduct the NFC signal and isolate the target radio frequency signal.

Specifically, the first isolation circuit F1 is an inductor. The first isolation circuit F1 is a band-pass circuit of the NFC signal and is a band-stop circuit of a target radio frequency signal (LMH band).

The radio frequency signal of the NFC chip 11 is sent to the common radiator 13 via the NFC coil 12 and the first isolation circuit F1, and is returned to ground via the second connection point B.

The target rf signal of the rf transceiver chip of the first antenna unit ANT1 is transmitted to the common radiator 13 through the second matching circuit M2. Due to the arrangement of the first isolation circuit F1, the target radio frequency signal does not flow to the NFC coil 12, so that the NFC signal and the target radio frequency signal are independent from each other.

Optionally, referring to fig. 10, the antenna assembly 10 further includes a second isolation circuit F2. One end of the second isolation circuit F2 is electrically connected to the other end of the NFC coil 12, and the other end of the second isolation circuit F2 is grounded. The second isolation circuit F2 is configured to conduct the target radio frequency signal and isolate the NFC signal.

Specifically, the second isolation circuit F2 is a capacitor. The second isolation circuit F2 is a band-stop circuit of the NFC signal and is a band-pass circuit of a target radio frequency signal (LMH band). The second isolation circuit F2 corresponds to an open circuit for the NFC signal. The second isolation circuit F2 corresponds to a short circuit for the target radio frequency signal.

The radio frequency signal of the NFC chip 11 is sent to the common radiator 13 via the NFC coil 12 and the first isolation circuit F1, and is grounded via the second connection point B, but not grounded via the second isolation circuit F2.

The target rf signal of the rf transceiver chip of the first antenna unit ANT1 is transmitted to the common radiator 13 through the second matching circuit M2. If a part of the target rf signal passes through the first isolation circuit F1, it passes through the second isolation circuit F2 to the ground, so as to avoid the target rf signal flowing to the NFC coil 12 and affecting the receiving and transmitting of the NFC signal.

Of course, the second matching circuit M2 can also isolate the NFC signal, so as to avoid the NFC signal from flowing to the radio frequency transceiver chip of the first antenna unit ANT1 through the second matching circuit M2.

Referring to fig. 11, the first isolation circuit F1 includes at least one inductor, and/or the second isolation circuit F2 includes at least one capacitor.

Optionally, the first isolation circuit F1 is an inductance connected in series between the NFC coil 12 and the common radiator 13, and the second isolation circuit F2 is a grounded capacitance.

Still alternatively, the first isolation circuit F1 includes a plurality of inductors disposed in series. By providing a plurality of series arranged inductors, the inductors can adjust the impedance of the radiator in the NFC antenna system to improve NFC performance.

Optionally, the second isolation circuit F2 includes a plurality of capacitors, and the plurality of capacitors are grounded. The capacitors are used for grounding the target rf signal passing through the first isolation circuit F1, so as to prevent the target rf signal from flowing to the NFC coil 12 and affecting the receiving and transmitting of the NFC signal.

Optionally, the plurality of grounding capacitors are different in size so as to filter the target radio frequency signals in different frequency bands, so that the target radio frequency signals are filtered more thoroughly.

With respect to the arrangement sequence of the plurality of capacitances and the plurality of inductances. Alternatively, a plurality of capacitors may be collectively disposed together, and a plurality of inductors may be collectively disposed together. Alternatively, the capacitor may be interposed between two adjacent inductors.

The shape of the NFC coil 12 is not limited in this application. Alternatively, the NFC coil 12 may be V-shaped, square, bent, circular, etc.

Optionally, referring to fig. 12, the antenna assembly 10 further includes a second antenna unit ANT2 and a third antenna unit ANT3. The radiator of the second antenna unit ANT2 and the radiator of the third antenna unit ANT3 are both the frame 32 of the electronic device 1, and the radiator of the second antenna unit ANT2 is disposed at the top edge 321 of the electronic device 1. The radiator of the third antenna unit ANT3 is arranged at the second side 324 of the electronic device 1. Wherein, the radiator of the second antenna unit ANT2 has a break between the radiator of the first antenna unit ANT 1. A gap is formed between the radiator of the third antenna unit ANT3 and the radiator of the second antenna unit ANT 2. The second antenna unit ANT2 and the third antenna unit ANT3 both have a radio frequency transceiver chip and a matching circuit. The structures of the second antenna unit ANT2 and the third antenna unit ANT3 may be specifically referred to the structure of the first antenna unit ANT 1. The first antenna unit ANT1, the second antenna unit ANT2, and the third antenna unit ANT3 may be configured to support an LB frequency band, an MB frequency band, an HB frequency band, a WIFI frequency band, a GPS frequency band, and the like.

When the radiators of the first antenna unit ANT1, the second antenna unit ANT2 and the third antenna unit ANT3 are used as a part of the mobile phone frame 32, the mobile phone frame 32 can be realized through CNC or MDA, and is not limited by the implementation manner.

According to the embodiment of the application, the NFC coil 12 and the mobile phone frame 32 are adopted as NFC antenna radiators, wherein the NFC coil 12 can be a plurality of turns of wires to serve as a first part of the NFC antenna radiator, and a radiator of a cellular antenna positioned on the mobile phone frame 32 is used as a second part of the NFC antenna radiator to form a complete NFC antenna, so that the resonance requirement of the NFC antenna is met, NFC performance is improved through multiplexing the cellular antenna, and user experience is improved; meanwhile, the NFC chip 11 adopts a single-ended circuit design, so that an NFC function is realized, one path of matching circuit is reduced, namely the number of capacitors/inductors is reduced, and the cost is reduced; by designing the isolation circuit, the influence of the cellular signal on the NFC antenna is isolated, and the antenna performance requirements of the cellular antenna and the NFC are considered.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present application, and that variations, modifications, alternatives and alterations of the above embodiments may be made by those skilled in the art within the scope of the present application, which are also to be regarded as being within the scope of the protection of the present application.

Claims

1. An antenna assembly, comprising:

the NFC chip comprises a connecting end;

2. The antenna assembly of claim 1, wherein the connection terminal comprises a first signal terminal, a second signal terminal, and a connection circuit connected between the first signal terminal and the second signal terminal.

3. The antenna assembly of claim 2, wherein the first signal terminal is electrically connected to one end of the NFC coil and the second connection point is electrically connected to the second signal terminal.

4. The antenna assembly of claim 1, further comprising a first matching circuit electrically connected between the connection terminal and one end of the NFC coil;

the antenna assembly further comprises a feed source and a second matching circuit, the second matching circuit is electrically connected between the feed source and the first connecting point, the other end of the NFC coil is electrically connected between the first connecting point and the second matching circuit, and the feed source is used for exciting the common radiator to transmit and receive target radio frequency signals.

5. The antenna assembly of claim 4, further comprising a first isolation circuit, one end of the first isolation circuit being electrically connected to the other end of the NFC coil, the other end of the first isolation circuit being electrically connected to the first connection point, the first isolation circuit being configured to conduct an NFC signal and isolate the target radio frequency signal.

6. The antenna assembly of claim 5, further comprising a second isolation circuit, one end of the second isolation circuit being electrically connected to the other end of the NFC coil, the other end of the second isolation circuit being grounded, the second isolation circuit being configured to conduct the target radio frequency signal and isolate the NFC signal.

7. The antenna assembly of claim 6, wherein the first isolation circuit comprises at least one inductance and/or the second isolation circuit comprises at least one capacitance.

8. The antenna assembly according to any of claims 4-7, wherein the target radio frequency signal comprises any one of a cellular mobile signal band, a WIFI band, a GPS band, or any combination of multiple bands.

9. The antenna assembly of any of claims 1-7, wherein the co-body radiator comprises any of a metal bezel, a metal frame embedded in a plastic bezel, a metal radiator located in or on a bezel, a flexible circuit board radiator, a laser direct structuring radiator, a printed direct structuring radiator, a metal bracket radiator.

10. An electronic device comprising a middle frame and an antenna assembly according to any one of claims 1-9, wherein the NFC chip and the NFC coil are located in an area surrounded by the middle frame, and the common radiator is located at a top portion of the middle frame and/or a portion of a side edge of the middle frame near the top portion.