CN113871870A

CN113871870A - Antenna assembly and electronic equipment

Info

Publication number: CN113871870A
Application number: CN202010615512.4A
Authority: CN
Inventors: 张小伟; 余冬; 储嘉慧; 侯猛
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-12-31
Anticipated expiration: 2040-06-30
Also published as: CN113871870B

Abstract

The embodiment of the application provides an antenna assembly and electronic equipment, electronic equipment includes cell-phone, panel computer, wearing equipment, virtual reality equipment, wireless U dish etc. have the removal or the fixed terminal of antenna, the antenna assembly that this application embodiment provided, set up the ground plane between first antenna and the second antenna in through the antenna assembly, the ground plane can play the shielding effect to the electromagnetic wave, the influence of second antenna to first antenna has been reduced, set up the gap on first antenna and ground plane, the second antenna also can outwards launch or receive the electromagnetic wave in the gap department on first antenna and ground plane like this, the sheltering from of ground plane and first antenna to the second antenna has been reduced like this, thereby the influence of first antenna to the second antenna has been reduced, the antenna assembly that this embodiment provided, the mutual influence between first antenna and the second antenna has been reduced.

Description

Antenna assembly and electronic equipment

Technical Field

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

Background

The smart terminals such as the mobile phone need to communicate through a mobile Communication network provided by an operator, and can also implement Communication connection between the smart devices through multiple modes such as Wireless Fidelity (WIFI), bluetooth, infrared, and the like. With the application of 5G technology, an antenna in a 5G frequency band, such as a sub-6G antenna, needs to be set in the mobile phone.

At present, when an antenna is arranged in a mobile phone, the antenna is mainly arranged on a battery cover or a middle frame of the mobile phone, and along with the increase of rear cameras, the space on the battery cover for the rear cameras to be arranged is increased, so that the space of the antenna arranged on the battery cover is reduced, and therefore, part of the antenna, such as an NFC antenna or a wireless charging antenna, is often overlapped with a sub-6G antenna in the direction perpendicular to a display screen, and the antenna, such as the NFC antenna or the wireless charging antenna, is positioned right in front of the sub-6G antenna.

However, when the two antennas are spatially overlapped, the two antennas are mutually affected, which results in greatly reduced radiation performance of the antennas.

Disclosure of Invention

The embodiment of the application provides an antenna module and electronic equipment, has reduced the interact between two antennas of range upon range of setting, has improved the radiation performance of antenna, has solved the problem that the interact leads to the antenna radiation performance to reduce when two current antennas overlap.

A first aspect of embodiments of the present application provides an antenna assembly, including:

the antenna comprises a first antenna and a second antenna which are stacked and arranged at intervals, wherein the orthographic projection area of the first antenna facing the second antenna is at least partially overlapped with the second antenna;

further comprising: a ground plane located between the first antenna and the second antenna;

a first gap is formed in the overlapping area of the first antenna and the second antenna, and a second gap corresponding to the first gap is formed in the grounding layer.

In the embodiment of the application, the ground layer is arranged between the first antenna and the second antenna, so that the influence of the second antenna on the first antenna is reduced through the ground layer, the gaps are formed in the first antenna and the ground layer, and the electromagnetic waves are outwards emitted from the second antenna through the gaps in the first antenna and the ground layer, so that the shielding of the first antenna on the second antenna is reduced, the influence of the first antenna on the second antenna is reduced, the mutual influence of two stacked antennas in the electronic device can be reduced, the radiation performance of the first antenna and the second antenna is improved, and the problem that the radiation performance is reduced due to the mutual influence when the two conventional antennas (sub-6G antenna and NFC antenna or wireless charging antenna) are arranged in a stacked mode is solved.

In one possible implementation manner, the method further includes: the ground plane covers at least an overlapping area between the first antenna and the second antenna. The ground plane thus at least reduces the mutual influence of the overlapping area between the first antenna and the second antenna.

In a possible implementation, the first slot is opened along a direction of a current fed on the first antenna. Therefore, the high-frequency current on the first antenna is consistent with the extending direction of the first gap, the path of the high-frequency current on the first antenna is not easy to change, the resonant frequency of the first antenna is not easy to change, the problem that the resonant frequency of the first antenna is changed due to the fact that the path of the high-frequency current on the first antenna is changed is solved, and therefore the resonant frequency of the first antenna is not easy to change due to the fact that the first gap is formed along the direction of the fed current on the first antenna.

In one possible implementation, the width of the first and second slits is between 0.1 and 2 mm.

In one possible implementation, the first antenna includes: a first antenna radiator and a first feed point;

the second antenna includes: a second antenna radiator and at least one feed point electrically connected to the second antenna radiator;

the ground plane is located between the first antenna radiator and the second antenna radiator, and the ground plane at least covers an overlapping area between the first antenna radiator and the second antenna radiator;

the first antenna radiator is provided with the first slot.

In one possible implementation manner, the electronic device is internally provided with a circuit board, and the circuit board is provided with a feed source;

the first feeding point and the at least one feeding point are located on the circuit board and electrically connected with the feed source, the first feeding point is used for feeding high-frequency current to the first antenna radiator, and the at least one feeding point is used for feeding high-frequency current to the second antenna radiator.

In one possible implementation, the first antenna further includes: a coupling metal layer disposed near the first antenna radiator and coupled to the first antenna radiator, wherein the first feeding point is electrically connected to the coupling metal layer, and the first feeding point feeds a high-frequency current to the first antenna radiator through the coupling metal layer and the first antenna radiator. Therefore, the purpose of non-contact coupling feeding of the first antenna radiator and the first feeding point is achieved, direct contact between the first feeding point and the first antenna radiator is avoided, when the antenna is directly connected with the feeding point, flexible buffer materials (such as elastic bonding pads or flexible metal buffer materials) need to be arranged on the antenna and the feeding point, therefore, coupling feeding is achieved between the first antenna radiator and the first feeding point through the coupling metal layer, elastic bonding pads or flexible metal buffer materials are avoided from being arranged on the antenna when the antenna is directly connected with the feeding point, and elastic pins and flexible metal buffer materials are avoided from being arranged on the feeding point.

In one possible implementation, the ground plane includes a first area and a second area, and the first area covers at least an overlapping area between the first antenna radiator and the second antenna radiator;

the second region extends in a direction away from the second antenna radiator;

the second gap is formed in the first area and a part of the second area;

the first slot is formed in a region of the first antenna radiator corresponding to the first region and the part of the second region.

In a possible implementation manner, the coupling metal layer is located on a side of the second area facing the first antenna radiator, and at least a portion of the coupling metal layer is located between the second area and the first antenna.

In one possible implementation, the antenna assembly further includes: the second antenna radiator is located on the support, and the support is arranged on the circuit board. The second antenna radiator is supported by the bracket.

In one possible implementation, the first antenna further includes: and the first grounding point is electrically connected with the first antenna radiator and is positioned on the circuit board, or the first grounding point is electrically connected with the grounding layer.

In one possible implementation, the second antenna further includes: and the second grounding point is electrically connected with the second antenna radiator and is positioned on the circuit board, or the second grounding point is electrically connected with the grounding layer.

In one possible implementation, the ground layer is a metal layer, and the metal layer is grounded.

In one possible implementation, the first antenna is a sub-6G antenna.

In one possible implementation, the second antenna includes a Near Field Communication (NFC) antenna or a wireless charging antenna.

A second aspect of the embodiments of the present application provides an electronic device, which at least includes: display screen, battery cover and any above-mentioned antenna module, at least part of the antenna module is located one side of the battery cover internal surface.

In one possible implementation, a first antenna of the antenna assembly is disposed on an inner surface of the battery cover, and a second antenna of the antenna assembly and the ground layer are located on a side of the first antenna facing the display screen.

In one possible implementation, the first antenna of the antenna assembly is disposed on an outer surface of the battery cover, the second antenna and the ground layer of the antenna assembly are located on one side of an inner surface of the battery cover, and the ground layer is adjacent to the inner surface of the battery cover.

In one possible implementation, the battery cover is a glass battery cover. Thus, the first antenna can be directly arranged on the inner surface of the glass battery cover, and the influence of the battery cover on the antenna component is avoided.

Drawings

Fig. 1 is a schematic perspective view of an electronic device according to an embodiment of the present disclosure;

fig. 2A is a schematic view of a disassembled structure of an electronic device according to an embodiment of the present application;

fig. 2B is a schematic diagram of a split structure of an electronic device according to an embodiment of the present application;

fig. 3A is a schematic diagram illustrating an antenna assembly and a battery cover according to an embodiment of the present disclosure;

fig. 3B is a schematic disassembled view of an antenna assembly according to an embodiment of the present application;

FIG. 3C is a schematic plan view of the antenna assembly of FIG. 3B after assembly;

fig. 3D is another schematic diagram illustrating a detachment of an antenna element and a battery cover according to an embodiment of the present disclosure;

FIG. 3E is a schematic plan view of the antenna assembly of FIG. 3D after assembly;

fig. 3F is another schematic diagram illustrating a disassembled antenna element and a battery cover according to an embodiment of the present disclosure;

FIG. 4 is a schematic cross-sectional view of an antenna assembly and a battery cover of the present application taken along the line A-A in FIG. 3A;

FIG. 5 is a schematic cross-sectional view of an antenna assembly and a battery cover according to an embodiment of the present application;

FIG. 6 is a schematic cross-sectional view of an antenna assembly and a battery cover according to another embodiment of the present disclosure;

fig. 7 is a schematic diagram illustrating an antenna assembly and a battery cover according to another embodiment of the present disclosure;

FIG. 8 is a schematic plan view of the antenna assembly of FIG. 7 after assembly;

FIG. 9 is a schematic cross-sectional view of an antenna assembly and a battery cover according to another embodiment of the present application;

FIG. 10 is a schematic cross-sectional view of an antenna assembly and a battery cover according to another embodiment of the present application;

11-13 are simulation test charts of a second antenna provided in an embodiment of the present application;

fig. 14 is a simulation test chart of the first antenna according to an embodiment of the present application.

Description of reference numerals:

100-mobile phone; 10-a display screen; 20-a battery cover; 21. 21 a-a frame; 22-an inner surface; 20 a-middle frame;

22 a-metal middle plate; 30-a circuit board; 40-a battery; 50-an antenna assembly; 51-a first antenna; 511-a first antenna radiator;

5111-a via; 512-coupling metal layer; f1 — first feeding point; f2 — second feeding point; f3 — third feed point; b-a feed source;

an L-feeder; 52-a second antenna; 521-a second antenna radiator; 522-a second ground point; 523-ferrite layer;

53-ground plane; 531-first area; 532-a second region; 54-a scaffold; 501-a first gap; 502-second slit.

Detailed Description

The terminology used in the description of the embodiments of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the application, as the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

According to the antenna assembly and the electronic device provided by the embodiment of the application, the ground layer is arranged between the first antenna and the second antenna in the antenna assembly, so that the influence of the second antenna on the first antenna is reduced through the ground layer, and the second antenna can emit electromagnetic waves outwards at the gaps on the first antenna and the ground layer through the gaps formed in the first antenna and the ground layer, so that the shielding of the first antenna on the second antenna is reduced, and the influence of the first antenna on the second antenna is reduced.

The electronic device provided by the embodiment of the application includes, but is not limited to, a mobile or fixed terminal with an antenna, such as a mobile phone, a tablet computer, a notebook computer, an ultra-mobile personal computer (UMPC), a handheld computer, an interphone, a netbook, a POS machine, a Personal Digital Assistant (PDA), a wearable device, a virtual reality device, a wireless usb disk, a bluetooth sound/earphone, or a vehicle-mounted front-end device.

In the embodiment of the present application, the mobile phone 100 is taken as the above-mentioned electronic device for example, the mobile phone 100 provided in the embodiment of the present application may be a bar phone, a slider phone or a foldable phone, and the embodiment of the present application takes the bar phone as an example for description. The cell-phone display screen that this application embodiment provided can be for water droplet screen, bang screen, dig hole screen or comprehensive screen, and the following description uses the water droplet screen as the example and explains.

Fig. 1 and 2A show an overall structure and a disassembled structure of the mobile phone 100, respectively, and referring to fig. 1 and 2A, the mobile phone 100 may include: the display screen 10 and the battery cover 20, the circuit board 30 and the battery 40 are arranged in an inner cavity defined by the display screen 10 and the battery cover 20, the circuit board 30 and the battery 40 can be arranged on an inner surface 22 of the battery cover, the battery cover 20 is provided with a frame 21, and a cavity with an open end is defined by the inner wall of the frame 21 and the inner surface 22.

In this embodiment, the battery 40 may be connected to the charging management module and the circuit board 30 through a power management module, and the power management module receives input from the battery 40 and/or the charging management module and supplies power to the processor, the internal memory, the external memory, the display screen, the camera, the communication module, and the like. The power management module may also be used to monitor parameters such as battery 40 capacity, battery 40 cycle count, battery 40 state of health (leakage, impedance), etc. In other embodiments, the power management module may also be disposed in the processor of the circuit board 30. In other embodiments, the power management module and the charging management module may be disposed in the same device.

The Display screen 10 may be an Organic Light-Emitting Diode (OLED) Display screen or a Liquid Crystal Display (LCD).

Of course, in some other examples, as shown in fig. 2B, the handset 100 may include: the display screen 10, the middle frame 20a and the battery cover 20, it should be noted that the battery cover 20 in fig. 2B is different from the battery cover 20 in fig. 2A in structure, in fig. 2A, the battery cover 20 has a frame 21, and in fig. 2B, the middle frame 20a may include a metal middle plate 22A and a frame 21 a. The frame 21a is disposed around the outer periphery of the metal intermediate plate 22 a. Bezel 21a may include a top edge, a bottom edge, a left side edge, and a right side edge, wherein the top edge, the bottom edge, the left side edge, and the right side edge define bezel 21a in a square ring configuration. The metal middle plate 22a may be an aluminum plate, an aluminum alloy, or a magnesium alloy. The frame 21a may be a metal frame, a ceramic frame, or a glass frame. The middle metal plate 22a and the side frame 21a may be connected by snapping, welding, bonding or integrally forming, for example, the middle metal plate 22a and the side frame 21a may be placed in a grinding tool, and plastic is poured between the middle metal plate 22a and the side frame 21a, so that the middle metal plate 22a and the side frame 21a are connected into an integral structure.

In the embodiment of the present application, the battery cover 20 may be a glass battery cover, but in some other examples, the battery cover 20 may also be a ceramic battery cover or a metal battery cover. When the battery cover 20 is a metal battery cover, the metal battery cover often affects the radiation of the antenna if the antenna is on the metal battery cover, so the metal battery cover in the electronic device can be used as the antenna through the slit.

It is to be understood that the illustrated structure of the embodiment of the present application does not specifically limit the mobile phone 100. In other embodiments of the present application, the handset 100 may include more or fewer components than shown, or some components may be combined, some components may be separated, or a different arrangement of components may be used. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

The following description will be made mainly by taking the structure shown in fig. 2A as an example.

In this embodiment of the present application, in order to ensure signal transmission or reception of the electronic device, an antenna assembly 50 is further disposed in the electronic device, where the antenna assembly 50 provided in this embodiment of the present application is shown in fig. 2B, and the antenna assembly 50 may include: the first antenna 51 and the second antenna 52 are stacked in the space between the display screen 10 and the inner surface of the battery cover 20 and spaced from each other by a predetermined distance, as shown in fig. 3A, in the embodiment of the present application, the first antenna 51 and the second antenna 52 may be disposed on the inner surface of the battery cover 20, and the second antenna 52 may be located on a side of the first antenna 51 facing the display screen 10, for example, the second antenna 52 may be located right in front of the first antenna 51 (see fig. 2B).

In the embodiment of the present application, the working frequency band of the first antenna 51 may be less than 6GHz, for example, the working frequency band of the first antenna 51 may be a middle frequency band (3.4GHz-3.6GHz), or the working frequency band of the first antenna 51 may also be a middle frequency band (4.8GHz-4.9 GHz).

In this embodiment of the application, the first antenna 51 may be a sub-6G antenna, the second antenna 52 may be an NFC antenna, and an operating frequency band of the NFC antenna may be 13.56MHz, or the second antenna 52 is a wireless charging antenna, and an operating frequency band of the wireless charging antenna may be 22KHz or 13.56 MHz.

In the embodiment of the present application, the second antenna 52 is specifically taken as an NFC antenna for example. Of course, in some other examples, the first Antenna 51 and the second Antenna 52 include, but are not limited to, the sub-6G Antenna, the NFC Antenna, or the wireless charging Antenna described above, for example, the first Antenna 51 and the second Antenna 52 may also be any one of a WIFI Antenna, a GPS Antenna, a Main Antenna (Main Antenna), and a Diversity Antenna (Diversity Antenna).

In this embodiment, the forward projection area of the first antenna 51 toward the second antenna 52 at least partially overlaps with the second antenna 52, for example, the forward projection area of the first antenna 51 toward the second antenna 52 partially overlaps with the second antenna 52 (as shown in fig. 3B), or in some other embodiments, the forward projection area of the first antenna 51 toward the second antenna 52 partially overlaps with the second antenna 52 completely.

Because first antenna 51 and second antenna 52 overlap at least partially, first antenna 51 causes the sheltering from to second antenna 52 like this, when making inside and outside transmission electromagnetic wave of second antenna 52, first antenna 51 shields part electromagnetic wave, make the radiation performance of second antenna 52 reduce, in addition, second antenna 52 also can exert an influence to the radiation of first antenna 51, especially when second antenna 52 is the NFC antenna, the one side of NFC antenna can have the ferrite, ferrite and NFC antenna constitute overall structure, the ferrite is magnetic material, the magnetic line that produces causes the influence to first antenna 51, make the radiation performance of first antenna 51 receive the influence.

In order to solve the above problem, in the embodiment of the present application, as shown in fig. 3A: further comprising: and a ground layer 53, the ground layer 53 being positioned between the first antenna 51 and the second antenna 52, so that the ground layer 53 can prevent the second antenna 52 from affecting the first antenna 51, and thus the radiation performance of the first antenna 51 is improved.

However, since the ground layer 53 and the first antenna 51 both shield the second antenna 52, so that the radiation performance of the second antenna 52 is reduced, in the embodiment of the present application, one or more first slots 501 are formed at intervals in at least an area where the first antenna 51 overlaps the second antenna 52, and one or more second slots 502 corresponding to the first slots 501 are formed in the ground layer 53. In the embodiment of the present application, the opening of the first slot 501 in the first antenna 51 is specifically to open the first slot 501 in the radiator of the first antenna 51.

For example, as shown in fig. 3A, the first antenna 51 has the first antenna radiator 511, so the first antenna radiator 511 of the first antenna 51 is provided with a plurality of first slots 501 arranged at intervals along the Y direction, in some examples, the first slots 501 may be arranged on the whole surface of the first antenna radiator 511 of the first antenna 51, or in other examples, the first slots 501 may be arranged on an area of the first antenna 51 overlapping with the second antenna 52.

One or more second slots 502 are formed in the ground layer 53 along the Y direction, and when the second slot 502 is formed, the second slot 502 may be formed in the ground layer 53 located in the overlapping area of the first antenna 51 and the second antenna 52, in order to reduce the influence of the second antenna 52 on the first antenna 51, that is, the portion of the ground layer 53 not located in the overlapping area of the first antenna 51 and the second antenna 52 may not be formed with a slot. This can ensure that the influence of the second antenna 52 on the first antenna 51 is reduced on the premise of ensuring that the first antenna 51 shields the second antenna 52 to be reduced, so that when the second antenna 52 is an NFC antenna, the iron oxide layer on the NFC antenna reduces the influence on the first antenna 51 under the shielding effect of the ground layer 53.

In the embodiment of the present application, when the ground layer 53 is disposed between the first antenna 51 and the second antenna 52, in order to reduce the mutual influence between the first antenna 51 and the second antenna 52, the ground layer 53 covers at least the overlapping area between the first antenna 51 and the second antenna 52, for example, the overlapping area between the first antenna 51 and the second antenna 52 falls within the ground layer 53, so that the ground layer 53 can at least reduce the mutual influence of the overlapping area between the first antenna 51 and the second antenna 52. It should be noted that in this embodiment of the application, specifically, when the first slot 501 is not formed in the first antenna 51, the first antenna 51 projects forward toward the second antenna 52, and a projection area projected onto the second antenna 52 and an area of the projection area corresponding to the first antenna 51 are overlapping areas between the first antenna 51 and the second antenna 52 (see an area between two dotted lines in fig. 4 described below).

It should be noted that the ground layer 53 covers at least the overlapping area between the first antenna 51 and the second antenna 52, but the overlapping area between the first antenna 51 and the second antenna 52 does not exceed the outer edge of the ground layer 53 (see fig. 4), and when the ground layer 53 is orthographically projected toward the first antenna 51 or the second antenna 52, the projected area of the ground layer 53 projected onto the first antenna 51 or the second antenna 52 covers the overlapping area between the first antenna 51 and the second antenna 52.

Therefore, in the embodiment of the present application, by disposing the ground layer 53 between the first antenna 51 and the second antenna 52, the ground layer 53 can play a role of shielding electromagnetic waves, so that when the second antenna 52 emits electromagnetic waves outwards, the ground layer 53 shields the electromagnetic waves emitted by the second antenna 52, and the ground layer 53 plays a role of shielding the electromagnetic waves from the first antenna 51, so that the electromagnetic waves emitted by the second antenna 52 are not easily acted on the first antenna 51, so that the influence of the second antenna 52 on the first antenna 51 is reduced, and by forming the slots on the first antenna 51 and the ground layer 53, so that the second antenna 52 emits electromagnetic waves or receives electromagnetic waves outwards through the slots on the first antenna 51 and the ground layer 53, so that the slots on the ground layer 53 and the first antenna 51 are reduced or avoided, so that the second antenna 52 cannot radiate or receive electromagnetic waves outwards due to shielding of the ground layer 53 and the first antenna 51 on the second antenna 52, so that the slots are formed on the ground layer 53 and the first antenna 51, the second antenna 52 is ensured to normally emit or receive electromagnetic waves outwards, shielding of the first antenna 51 and the ground layer 53 on the second antenna 52 is reduced, influence of the first antenna 51 on the second antenna 52 is reduced, mutual influence of two stacked antennas in the electronic device is ensured to be reduced, and radiation performance of the first antenna 51 and the second antenna 52 is improved.

In the embodiment of the present application, when the first slot 501 is formed in the first antenna 51, the first slot 501 may be formed in any direction on the first antenna 51, as long as the electromagnetic wave generated by the second antenna 52 can radiate outwards from the first slot 501 and the second slot 502 or can receive the electromagnetic wave.

The second slot 502 formed in the ground layer 53 may correspond to the first slot 501, and it should be noted that the correspondence between the first slot 501 and the second slot 502 means that an orthogonal projection of the first slot 501 toward the ground layer 53 at least partially overlaps with the second slot 502.

The lengths of the first slot 501 and the second slot 502 are specifically set according to the size of the overlapping area of the first antenna 51 and the second antenna 52, for example, when the overlapping area of the first antenna 51 and the second antenna 52 is large, the length of the first slot 501 and the second slot 502 is at least greater than the minimum length of the overlapping area of the first antenna 51 and the second antenna 52.

The number of the first and

second slots

501 and 502 is specifically set according to whether the electromagnetic waves radiated or received by the second antenna 52 are less or not affected by the ground layer 53 and the second antenna 52, for example, when the number of the first and

second slots

501 and 502 is 4, the performance of the second antenna 52 radiating or receiving electromagnetic waves outward is close to the performance of the second antenna 52 radiating or receiving electromagnetic waves outward when it is set alone, or the performance of the second antenna 52 radiating or receiving electromagnetic waves outward is different from the performance of the second antenna 52 radiating or receiving electromagnetic waves outward when it is set alone by less than a preset difference, then the number of the first and

second slots

501 and 502 is 4 respectively, or when the number of the first and

second slots

501 and 502 is 4, the performance of the second antenna 52 radiating or receiving electromagnetic waves outward is larger than the performance of the second antenna 52 radiating or receiving electromagnetic waves outward when it is set alone, the number of the first and

second slits

501 and 502 opened may be increased to 4 or more than 4.

When the first slots 501 and the second slots 502 are provided in a plurality of numbers, the interval between two adjacent first slots 501 and the interval between two adjacent second slots 502 are not limited, as long as the electromagnetic waves generated by the second antenna 52 radiate outwards from the first slots 501 and the second slots 502 or can receive the electromagnetic waves without being affected.

In one possible implementation, as shown in fig. 3A, the first antenna 51 may include: a first antenna radiator 511 and a first feeding point F1, the first feeding point F1 being for feeding a high frequency current to the first antenna radiator 511, the high frequency current being radiated outward on the first antenna radiator 511 in the manner of an induction cooker.

Here, as shown in fig. 3A, the first feeding point F1 may be directly connected to the first antenna radiator 511 to realize feeding (i.e., direct feeding), or, in some other examples, the first feeding point F1 may also feed the first antenna radiator 511 by coupling, for example, the first feeding point F1 is not in contact with the first antenna radiator 511 (see fig. 9), and by coupling feeding, the first feeding point F1 is prevented from being in contact with the first antenna radiator 511, which avoids the problem that a buffer material needs to be disposed on the feeding point and the antenna radiator when the antenna radiator is directly connected to the feeding point.

In the embodiment of the present application, as shown in fig. 3A, a plurality of first slots 501 are formed on the first antenna radiator 511. The second antenna 52 may include: the second antenna radiator 521 and the at least one feeding point electrically connected to the second antenna radiator 52, for example, in fig. 3A, the second antenna radiator 521 electrically connects two feeding points, that is, the second feeding point F2 and the third feeding point F3, respectively, that is, the second antenna 52 adopts a dual feeding mode, the second antenna radiator 521 may have a structure formed by metal material wound at least one turn, in fig. 3A, the second antenna radiator 521 is wound multiple turns, and the second feeding point F2 and the third feeding point F3 are electrically connected to two ends of the second antenna radiator 521, respectively, where the third feeding point F3 may be a differential feeding point.

Of course, in some other examples, the second antenna radiator 521 may also make one turn, so that a single feed may be used, such that one end of the second antenna radiator 521 is grounded and the other end is connected to the second feeding point F2 or the third feeding point F3, where the third feeding point F3 and the second feeding point F2 may or may not be in direct electrical contact with the second antenna radiator 521, and the feeding is implemented by coupling.

The first antenna 51 and the second antenna 52 at least partially overlap, specifically, the first antenna radiator 511 and the second antenna radiator 521 at least partially overlap, for example, an orthographic projection area of the first antenna radiator 511 toward the second antenna radiator 521 partially overlaps with the second antenna radiator 521 (see fig. 3C), and of course, in some other examples, the orthographic projection area of the first antenna radiator 511 toward the second antenna radiator 521 may completely overlap with the second antenna radiator 521.

In the embodiment, when the ground layer 53 is disposed between the first antenna radiator 511 and the second antenna radiator 521, the ground layer 53 is spaced apart from the first antenna radiator 511 and the second antenna radiator 521 (see fig. 4), so that a clearance between the ground layer 53 and the first antenna radiator 511 and the second antenna radiator 521 is ensured, and the radiation performance of the first antenna radiator 511 and the second antenna radiator 521 is better. It should be noted that the distance between the ground layer 53 and the first and

second antenna radiators

511 and 521 is specifically set according to actual requirements.

For example, as shown in fig. 3B and 3C, the ground layer 53 covers the overlapping area between the first antenna radiator 511 and the second antenna radiator 521, and meanwhile, the ground layer 53 extends outward, when the first antenna 51 is orthographically projected toward the ground layer 53, the projected area of the first antenna 51 on the ground layer 53 is located on the ground layer 53, so that the ground layer 53 has a better effect of resisting the first antenna 51, and the effect of the second antenna 52 on the first antenna 51 is greatly reduced.

In one possible implementation, the opening direction of the first slot 501 is along the direction of the current fed to the first antenna 51, for example, as shown in fig. 3A, the current fed to the first antenna radiator 511 is in the Y direction, so that the first slot 501 is opened on the first antenna radiator 511 along the Y direction, and the extending direction of the second slot 502 corresponds to the extending direction of the first slot 501, so that the second slot 502 extends along the Y direction.

In the embodiment of the present application, as shown in fig. 3C, when the second antenna radiator 521, the ground layer 53 and the first antenna radiator 511 are stacked, the first slot 501 of the first antenna radiator 511 is opposite to the corresponding second slot 502 of the ground layer 53, so that the second antenna radiator 521 can be ensured to radiate outwards smoothly.

In the embodiment of the present application, as shown in fig. 3C, the widths of the first and

second slits

501 and 502 may be between 0.1 and 2mm, for example, as shown in fig. 3C, the width b1 of the first slit 501 and the width b2 of the second slit 502 may be the same, for example, the width b1 of the first slit 501 and the width b2 of the second slit 502 may be 1mm or 1.5mm, or the width b1 of the first slit 501 and the width b2 of the second slit 502 may be different, but the width b1 of the first slit 501 may be greater than the width b2 of the second slit 502, for example, the width b1 of the first slit 501 may be 1.2mm, and the width b of the second slit 502 may be 0.9 mm. By making the width b1 of the first slot 501 larger than the width b2 of the second slot 502, the shielding of the second antenna 52 by the first slot 501 is further reduced, which ensures that the radiation performance of the second antenna 52 is improved.

In some other embodiments, as shown in fig. 3D, the feeding direction of the current on the first antenna radiator 511 is the X direction, the first slot 501 is opened on the first antenna radiator 511 along the X direction, and the second slot 502 on the ground layer 53 also extends along the X direction.

As shown in fig. 3E, the first slot 501 of the first antenna radiator 511 is opposite to the corresponding second slot 502 of the ground layer 53, so that the shielding of the second antenna 52 by the ground layer 53 and the first antenna radiator 511 is reduced, and the influence of the ground layer 53 and the first antenna radiator 511 on the second antenna 52 is reduced.

Of course, in some examples, since the current flowing direction on the first antenna radiator 511 includes, but is not limited to, an X direction or a Y direction, the opening direction of the first slot 501 and the second slot 502 is not limited to the X direction or the Y direction. The first slits 501 and the second slits 502 may be parallel or non-parallel.

For example, as shown in fig. 3F, the current feeding direction of the first antenna radiator 511 is along a plurality of directions, that is, the current direction of the first antenna radiator 511 is a plurality of directions, so that the opening direction of the plurality of first slots 501 can be a plurality of directions, and the extending direction of the plurality of first slots 501 is consistent with the plurality of current directions of the first antenna radiator 511. The first and

second slits

501 and 502 open along a plurality of current directions, and the plurality of first slits 501 and the plurality of second slits 502 are not parallel. Since the current direction is not limited to a straight line, but may be a curved line, the plurality of first slits 501 and the plurality of second slits 502 include, but are not limited to, straight-line holes, and may be curved slits.

By forming the first slot 501 along the direction of the current fed into the first antenna 51, the path of the high-frequency current on the first antenna 51 is not easy to change, so that the resonant frequency of the first antenna 51 is not easy to change, and the problem that the resonant frequency of the first antenna 51 is changed due to the change of the path of the high-frequency current on the first antenna 51 is avoided, therefore, the resonant frequency of the first antenna 51 is not easy to change due to the formation of the first slot 501 along the direction of the current fed into the first antenna 51.

As shown in fig. 3F, the second antenna radiator 521 is a radiator formed by winding, so that the second antenna 52 may include a feeding point, such as a second feeding point F2, the second antenna 52 further includes a second grounding point 522, one end of the second antenna radiator 521 is electrically connected to the second feeding point F2, and the other end of the second antenna radiator 521 is electrically connected to the second grounding point 522, so as to implement grounding. The second ground point 522 may be a contact point where the second antenna radiator 521 is connected to a reference ground (e.g., a ground layer of a circuit board or the metal middle plate 22 a).

In a possible implementation manner, when the second antenna 52 is an NFC antenna, as shown in fig. 4, the second antenna 52 may further include: and the ferrite layer 523 is arranged on the surface of the second antenna radiator 521 away from the ground layer 53, and the ferrite layer 523 and the second antenna radiator 521 form an integral structure. The first antenna radiator 511 is provided on the inner surface of the battery cover 20, one surface of the ground layer 53 is spaced apart from the first antenna radiator 511, and the other surface of the ground layer 53 is spaced apart from the second antenna radiator 521. The area between the two dotted lines in fig. 4 is the overlapping area of the first antenna radiator 511 and the second antenna radiator 521, and both ends of the ground layer 53 respectively exceed the overlapping area, so that the ground layer 53 has a better anti-influence effect on the first antenna 51, thereby reducing the influence of the second antenna 52 on the first antenna 51.

In one possible implementation, in order to support the second antenna radiator 521, as shown in fig. 5, the antenna assembly 50 may further include: in the embodiment of the present invention, the bracket 54 may be disposed on the circuit board 30, the second antenna radiator 521 is disposed on the bracket 54, and the second antenna radiator 521 is supported on the circuit board 30 by the bracket 54, in which the ground layer 53 may also be fixed on the circuit board 30 by a support, or one end of the bracket 54 is used to support the second antenna radiator 521, and the other end of the bracket 54 supports the ground layer 53, and the ground layer 53 is located on a side of the second antenna radiator 521 facing the battery cover 20.

The circuit board 30 has a feed source B, which may be a radio frequency module, the feed source B is electrically connected to a first feed point F1 and a second feed point F2 through a feed line L, the first feed point F1 and the second feed point F2 may be located on the circuit board 30, and the second feed point F2 is electrically connected to the second antenna radiator 521, so that a high-frequency current emitted from the feed source B is fed into the second antenna radiator 521 through the second feed point F2. In fig. 5, the first feeding point F1 is electrically connected to the first antenna radiator 511, and the first feeding point F1 directly feeds power to the first antenna radiator 511.

In another possible implementation, as shown in fig. 6, the first antenna radiator 511 is located on the outer surface of the battery cover 20, the first antenna radiator 511 and the ground layer 53 are respectively located on both sides of the battery cover 20, and the first feeding point F1 may be electrically connected to the first antenna radiator 511 through a via 5111 on the battery cover 20. Of course, in some other examples, the first feeding point F1 may be electrically connected to the first antenna radiator 511 by a wire passing through the battery cover 20.

In the embodiment, when the first antenna radiator 511 is located on the outer surface of the battery cover 20, the ground layer 53 may be disposed on the inner surface of the battery cover 20. By providing the first antenna radiator 511 on the outer surface of the battery cover 20, more space can be saved on the inner surface of the battery cover 20, and other components can be provided in the space.

It should be noted that, in fig. 6, when the first antenna radiator 511 is disposed on the outer surface of the battery cover 20, the second antenna radiator 521 has a step difference with the outer surface of the battery cover 20, so that a raised area is formed on the outer surface of the battery cover 20, in order to ensure the aesthetic appearance of the battery cover 20, an opening or a groove (not shown) may be formed on the outer surface of the battery cover 20, and the first antenna radiator 511 is accommodated in the opening or the groove of the battery cover 20 to ensure that the second antenna radiator 521 is flush with the outer surface of the battery cover 20.

In another possible implementation, the first feeding point F1 is coupled to the first antenna radiator 511, for example, as shown in fig. 7, the first antenna 51 may further include: a coupling metal layer 512, the coupling metal layer 512 is disposed near the first antenna radiator 511 and coupled to the first antenna radiator 511, a first feeding point F1 is electrically connected to the coupling metal layer 512, and the first feeding point F1 is coupled to the first antenna radiator 511 through the coupling metal layer 512, so as to feed a high frequency current into the first antenna radiator 511. Thus, the coupling metal layer 512 is not in contact with the first antenna radiator 511, and is not connected to the first antenna radiator 511, and the coupling metal layer 512 and the first antenna radiator 511 are fed by coupling.

As shown in fig. 8, one end of the coupling metal layer 512 extends into the space between the ground layer 53 and the first antenna radiator 511, and the other end of the coupling metal layer 512 extends outward and is electrically connected to the first feeding point F1.

In order to avoid the shielding of the coupling metal layer 512 on the first slot 501 and the second slot 502 to affect the radiation performance of the second antenna 52, in the embodiment of the present application, as shown in fig. 9, the ground layer 53 may include: a first area 531 and a second area 532, the first area 531 at least covering the overlapping area between the first antenna radiator 511 and the second antenna radiator 521.

For example, a portion of the first region 531 is located in the overlapping area between the first antenna radiator 511 and the second antenna radiator 521, and the portion of the first region 531 extends out to the left dashed line in fig. 9, so that the first region 531 can have a better anti-influence effect on one end of the first antenna radiator 511. The second region 532 extends in a direction away from the second antenna 52, e.g. the first region 531 extends beyond the dashed right-hand line in fig. 9 to the outer edge of the other end of the first antenna radiator 511. Thus, the first region 531 and the second region 532 can have an anti-influence effect on the first antenna radiator 511, and the influence of the ferrite layer 523 on the second antenna radiator 521 can be reduced.

When the slit is formed, the second slit 502 is opened in the first region 531 and a part of the second region 532, for example, a part of the second slit 502 may be located in the first region 531, and another part of the second slit 502 may be located in a part of the second region 532. The first slot 501 is opened in an area of the first antenna radiator 511 corresponding to the first area 531 and a part of the second area 532, so that no slot is opened in the second area 532 of the ground layer 53 and a part of the area of the first antenna radiator 511.

Therefore, as shown in fig. 9, the coupling metal layer 512 is located on the side of the second area 532 facing the first antenna 51, and at least a portion of the coupling metal layer 512 is located between the second area 532 and the first antenna radiator 511, for example, as shown in fig. 8, a portion of the coupling metal layer 512 is located between the second area 532 and the area where the first antenna radiator 511 is not opened, so as to avoid the coupling metal layer 512 shielding the first slot 501 and the second slot 502 to affect the radiation of the second antenna 52, and ensure that the coupling metal layer 512 does not affect the second antenna 52, as shown in fig. 9, another portion of the coupling metal layer 512 exceeds the outer edge of the first antenna radiator 511, so as to facilitate the electrical connection between the coupling metal layer 512 and the first feeding point F1.

In one possible implementation, as shown in fig. 10, when the coupling metal layer 512 is provided, the second antenna radiator 521 may be provided on the outer surface of the battery cover 20, and the coupling metal layer 512 is provided on the inner surface of the battery cover 20, so that the coupling metal layer 512 and the first antenna radiator 511 are coupled to feed high-frequency current, thereby preventing a via hole electrically connected to the first antenna radiator 511 or a through hole through which a conductive wire passes from being opened in the battery cover 20.

In the embodiment of the present application, the ground layer 53 may be a metal layer, the metal layer is grounded, and the metal layer may be a copper layer or an aluminum layer. The metal layer may be electrically connected to a ground point on the circuit board 30 to achieve grounding, or the metal middle plate 22a of the middle frame may serve as a reference floor, and the metal layer may be electrically connected to the metal middle plate 22a to achieve grounding.

In this embodiment, the first antenna 51 may further include: a first grounding point (not shown) electrically connected to the first antenna radiator 511 may be located on the circuit board 30, or the first grounding point may be electrically connected to the grounding layer 53. Alternatively, the first grounding point is located on the metal middle plate 22a, for example, the first antenna radiator 511 is electrically connected to the metal middle plate 22a to realize grounding.

Of course, in some examples, the first antenna 51 and the second antenna 52 may not be grounded.

Based on the above description, simulation tests were performed on the antenna assembly 50 in the following scenarios one and two, for example.

Scene one

In this scenario, the first antenna 51 in the antenna assembly 50 is a sub-6G antenna, the second antenna 52 is an NFC antenna, and the NFC antenna is subjected to simulation test, and is respectively tested under three conditions:

the first method is that the NFC antenna is separately arranged, that is, the sub-6G antenna is not arranged, and a Tag card is placed directly above the NFC antenna, the vertical distance between the Tag card and the NFC antenna is 40mm, the test result is shown in fig. 11, S1,1, S2,2 are reflection coefficients (that is, return loss curves) of the NFC antenna and the Tag card when they interact with each other, and S2,1 is a coupling degree curve of the NFC antenna and the Tag card, which can be obtained in fig. 11, when the NFC antenna is separately arranged, the coupling degree between the Tag card and the NFC antenna is-24.6 dB, where the coupling degree between the Tag card and the NFC antenna specifically refers to the amount of energy that the Tag card is coupled to the NFC antenna when the NFC antenna radiates, and the larger the value of the coupling degree indicates that the greater the energy that the Tag card is coupled to the Tag card, the greater the sensing strength of the Tag card.

The second case is: the sub-6G antenna is additionally arranged and is partially overlapped with the NFC antenna, the sub-6G antenna is located between the NFC antenna and the Tag card, the coupling degree between the NFC antenna and the Tag card is tested, the detection result is shown in figure 12, the coupling degree between the Tag card and the NFC antenna is changed to-26 dB, so that the sub-6G antenna is arranged, the coupling degree between the Tag card and the NFC antenna is reduced from-24.6 dB to-26 dB, the coupling degree is reduced and worsened by 1.4dB, the linear energy loss of the NFC antenna is about 14%, when the sub-6G antenna and the NFC antenna are arranged in an overlapped mode, the sub-6G antenna shields the NFC antenna, the sub-6G antenna influences the radiation of the NFC antenna, and the energy coupled by the Tag card is reduced.

The third case is: the ground layer 53 is added between the sub-6G antenna and the NFC antenna, and the ground layer 53 and the sub-6G antenna (i.e., the first antenna radiator 511) are respectively provided with a first slot 501 and a second slot 502 (taking the structure shown in fig. 3A as an example), the widths of the first slot 501 and the second slot 502 are 0.5mm, as shown in fig. 13, the coupling degree between the Tag card and the NFC antenna is-24.7 dB, that is, after the ground layer 53 is added, and the ground layer 53 and the sub-6G antenna are provided with slots, the coupling degree between the Tag card and the NFC antenna is increased from-26 dB to-24.7 dB, which is 0.1dB different from the coupling degree (-24.6dB) in fig. 11, and affects the performance of the NFC antenna by about 1%, so, when the ground layer 53 is added, and when the slots are provided on the ground layer 53 and the sub-6G antenna, the sub-6G antenna affects the NFC antenna by about 1% compared with the first case, but the provision of the slots in the ground plane 53 and the sub-6G antenna greatly reduces the effect of the sub-6G antenna on the NFC antenna compared to the second case.

Scene two

In this scenario, the first antenna 51 is a sub-6G antenna, the current mode of the sub-6G antenna is an 1/2 wavelength mode, and the second antenna 52 is an NFC antenna, and the sub-6G antenna is subjected to simulation testing, and NFC is tested under four conditions respectively.

The four cases are respectively: the sub-6G antenna is separately arranged, the NFC antenna is added, the NFC antenna and the ground layer 53 are added, and gaps are formed in the ground layer 53, and these four cases are respectively tested, where the test result of the radiation performance is shown in fig. 14, where L1 is a radiation performance curve when the sub-6G antenna is separately arranged, L2 is a radiation performance curve when the NFC antenna and the ground layer 53 are added, L3 is a radiation performance curve when the NFC antenna is added and the ground layer 53 is not arranged, and L4 is a second gap 502 formed in the ground layer 53 when the NFC antenna and the ground layer 53 are added.

As can be seen from fig. 14, compared with the L1 curve, the L3 curve has an effect on the radiation performance of the sub-6G antenna after the NFC antenna is added, so that the radiation performance of the sub-6G antenna is greatly reduced. It should be noted that the influence of the NFC antenna on the sub-6G antenna is mainly that the NFC antenna includes ferrite, and the ferrite affects radiation of the sub-6G antenna.

As can be seen from the curves L3 and L2, when the ground layer 53 is disposed, since the ground layer 53 can shield electromagnetic waves, the influence of the NFC antenna on the sub-6G antenna is reduced, and the radiation performance of the sub-6G antenna is improved by increasing or decreasing the ground layer 53. The L2 curve compared to the L1 curve may result in the L2 curve having lower radiation performance than the L1 curve compared to the L1 curve because the ground plane 53 reduces the effect of the NFC antenna on the sub-6G antenna, but the sub-6G antenna may be affected by other areas of the NFC antenna such that the L2 curve has lower radiation performance than the L1 curve.

Compared with the L2 curve, in the L4 curve, since the second slot 502 is formed in the ground layer 53, the NFC antenna affects the radiation performance of the sub-6G antenna through the second slot 502, so that the radiation performance of the sub-6G antenna is reduced, but compared with the L3 curve corresponding to the ground layer 53, since the position where no slot is formed in the ground layer 53 still has a shielding effect on the NFC antenna, the influence of the NFC antenna on the sub-6G antenna can be reduced, and therefore, the ground layer 53 is provided between the NFC antenna and the sub-6G antenna, and the slot is formed in the ground layer 53, the influence of the NFC antenna on the sub-6G antenna can be reduced.

In summary, when the ground layer 53 is disposed between the two antennas that are overlapped, and the ground layer 53 and one of the antennas are provided with a gap, the mutual influence between the two antennas can be reduced, and the radiation performance of the two antennas can be improved.

In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the embodiments of the application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present application, and are not limited thereto; although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An antenna assembly for use in an electronic device, comprising:

2. The antenna assembly of claim 1, wherein the ground layer covers at least an overlapping area between the first antenna and the second antenna.

3. The antenna assembly of claim 1 or 2, wherein the first slot opens in the direction of current fed on the first antenna.

4. An antenna assembly according to any one of claims 1-3, characterized in that the width of the first slot and the second slot is between 0.1-2 mm.

5. The antenna assembly of any one of claims 1-4, wherein the first antenna comprises: a first antenna radiator and a first feed point;

the first antenna radiator is provided with the first slot.

6. The antenna assembly of claim 5, wherein the electronic device has a circuit board therein, the circuit board having a feed thereon;

7. The antenna assembly of claim 6, wherein the first antenna further comprises: a coupling metal layer disposed near the first antenna radiator and coupled to the first antenna radiator, wherein the first feeding point is electrically connected to the coupling metal layer, and the first feeding point feeds a high-frequency current to the first antenna radiator through the coupling metal layer and the first antenna radiator.

8. The antenna assembly of claim 7, wherein the ground layer comprises a first area and a second area, the first area covering at least an overlapping area between the first antenna radiator and the second antenna radiator;

the second region extends in a direction away from the second antenna radiator;

the second gap is formed in the first area and a part of the second area;

9. The antenna assembly of claim 8, wherein the coupling metal layer is located on a side of the second region facing the first antenna radiator, and at least a portion of the coupling metal layer is located between the second region and the first antenna.

10. The antenna assembly of any one of claims 6-9, further comprising: the second antenna radiator is located on the support, and the support is arranged on the circuit board.

11. The antenna assembly of any one of claims 6-10, wherein the first antenna further comprises: and the first grounding point is electrically connected with the first antenna radiator and is positioned on the circuit board, or the first grounding point is electrically connected with the grounding layer.

12. The antenna assembly of any one of claims 6-11, wherein the second antenna further comprises: and the second grounding point is electrically connected with the second antenna radiator and is positioned on the circuit board, or the second grounding point is electrically connected with the grounding layer.

13. The antenna assembly of any one of claims 1-12, wherein the ground layer is a metal layer, and wherein the metal layer is grounded.

14. The antenna assembly of any one of claims 1-13, wherein the first antenna is a sub-6G antenna.

15. The antenna assembly of any one of claims 1-14, wherein the second antenna comprises a Near Field Communication (NFC) antenna or a wireless charging antenna.

16. An electronic device, characterized in that it comprises at least: a display, a battery cover, and the antenna assembly of any one of claims 1-15, at least a portion of the antenna assembly being located on one side of an inner surface of the battery cover.

17. The electronic device of claim 16, wherein a first antenna of the antenna assembly is disposed on the inner surface of the battery cover, and wherein a second antenna of the antenna assembly and a ground layer are located on a side of the first antenna facing the display screen.

18. The electronic device of claim 16, wherein the first antenna of the antenna assembly is disposed on an outer surface of the battery cover, wherein the second antenna of the antenna assembly and the ground layer are located on one side of an inner surface of the battery cover, and wherein the ground layer is proximate to the inner surface of the battery cover.

19. The electronic device of any of claims 16-18, wherein the battery cover is a glass battery cover.