CN111510546B

CN111510546B - Terminal

Info

Publication number: CN111510546B
Application number: CN202010333795.3A
Authority: CN
Inventors: 雍征东
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2021-06-11
Anticipated expiration: 2040-04-24
Also published as: CN111510546A

Abstract

The embodiment of the application provides a terminal and relates to the technical field of terminals. The terminal includes: the antenna comprises a machine body and a first antenna module; a first target area of the body is covered with a first phase change material, the first target area comprises an area located in the radiation direction of the first antenna module, and the first phase change material comprises a metal state and a non-metal state; when the first phase change material is changed from a non-metal state to a metal state, the first antenna module stops working. According to the embodiment of the application, the phase-change material covers the area in the radiation direction of the antenna module, and comprises a metal state and a non-metal state. When the phase-change material is changed from the non-metal state to the metal state, the radio-frequency signal radiated by the antenna module cannot pass through the machine body, and the antenna module stops working, so that the antenna module is protected, and the device is prevented from being damaged by the antenna module due to overhigh temperature.

Description

Terminal

Technical Field

The embodiment of the application relates to the technical field of terminals, in particular to a terminal.

Background

Terminals having a wireless communication function, such as a mobile phone, are generally provided with an antenna, and a function of transmitting and receiving radio frequency signals is realized through the antenna.

In the related art, since the network systems and the used frequency bands adopted by the network operators are different, the terminal needs to support communication services of different frequency bands in the communication process.

Disclosure of Invention

The embodiment of the application provides a terminal. The terminal includes: the antenna comprises a machine body and a first antenna module;

a first target area of the body is covered with a first phase change material, the first target area includes an area located in the radiation direction of the first antenna module, and the first phase change material includes a metal state and a non-metal state;

when the first phase change material is changed from a non-metal state to a metal state, the first antenna module stops working.

The technical scheme provided by the embodiment of the application can bring the following beneficial effects:

the phase-change material is covered by an area in the radiation direction of the antenna module, and the phase-change material comprises a metal state and a non-metal state. When the phase-change material is changed from the non-metal state to the metal state, the radio-frequency signal radiated by the antenna module cannot pass through the machine body, and the antenna module stops working, so that the antenna module is protected, and the device is prevented from being damaged by the antenna module due to overhigh temperature.

Drawings

Fig. 1 is a schematic diagram of a terminal provided in an embodiment of the present application;

fig. 2 is a schematic diagram of a terminal provided in another embodiment of the present application;

fig. 3 is a schematic diagram of a terminal provided in another embodiment of the present application;

fig. 4 is a schematic diagram of a terminal provided in another embodiment of the present application;

fig. 5 is a schematic diagram of a terminal provided in another embodiment of the present application;

fig. 6 is a schematic diagram of a terminal according to another embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

For the sake of understanding, the following first briefly introduces terms related to the embodiments of the present application.

Phase change material: refers to a substance that changes state with temperature. Phase change materials generally have two states: metallic and non-metallic states. In different states, the electromagnetic properties (such as relative dielectric constant, conductivity, etc.) of the phase-change material are significantly different. Induced by temperature, laser excitation and the like, the arrangement mode of atoms in the phase-change material is changed, so that the change of the electromagnetic property of the phase-change material is triggered, the conversion from one state to another state is realized, and the conversion process is reversible.

Injection molding: it is a method for producing and shaping industrial products. The main types of the injection molding include rubber injection molding, plastic injection molding and molding injection molding. Rubber injection molding is a production method for directly injecting rubber material into a mold from a cylinder for vulcanization; plastic injection molding is a method for plastic products, wherein molten plastic is injected into a plastic product mold by pressure, and a desired plastic part is obtained by cooling and molding; molding and injection molding: the shape obtained by injection molding is often the final product and no further processing is required before installation or use as a final product.

Referring to fig. 1, a schematic diagram of a terminal according to an embodiment of the present application is shown. The terminal 100 includes: the body 110, the first antenna module 120.

In the embodiment of the present application, the first target area 111 of the body 110 is covered with the first phase change material, the first target area includes an area located in the radiation direction of the first antenna module, and the first phase change material includes a metal state and a non-metal state. When the first phase change material changes from the non-metallic state to the metallic state, the first antenna module 120 stops operating.

In the embodiment of the present application, the terminal 100 refers to an electronic device having a communication function. For example, the terminal 100 may include a mobile phone, a vehicle-mounted device, a smart wearable device, a tablet Computer, an e-book reader, an MP3(Moving Picture Experts Group Audio Layer III, mpeg compression standard Audio Layer 3) player, an MP4(Moving Picture Experts Group Audio Layer IV, mpeg compression standard Audio Layer 4) player, a PC (Personal Computer), a smart home device, and other electronic devices.

The body 110, which may also be referred to as a body, is a main body frame of the terminal 100. The body 110 has a generally hexahedral shape, and partial edges or corners of the hexahedron may be formed with arc-shaped chamfers. The front surface of the body 110 is generally in the shape of a rounded rectangle or a right-angled rectangle.

In the exemplary embodiment, first antenna module 120 includes a millimeter wave antenna. Millimeter wave antennas have different design architectures and directions, and the more mainstream direction is generally based on a phased array (phased antenna) manner, and the implementation manners of the phased array millimeter wave antenna can be mainly divided into three types: AoB (Antenna on Board), i.e., Antenna array located on the system motherboard, AiP (packaged Antenna), i.e., Antenna array located in the Package of the chip, AiM (Antenna in Module), i.e., Antenna array and RFIC (Radio Frequency Integrated Circuit) form a Module.

Optionally, the first antenna module 120 may support a 5G frequency band, such as an n257 frequency band (26.5-29.5GHz), an n258 frequency band (24.25-27.5GHz), an n261 frequency band (27.5-28.35GHz), and an n260 frequency band (37-40GHz) in the 5G frequency band. In a possible implementation, the first antenna module 120 can support both the 5G band and the 4G band. In the embodiment of the present application, 4G is the abbreviation of the 4th Generation mobile communication technology (the 4G communication system), and the 4G communication system may also be referred to as an LTE (Long Term Evolution) system. The 5G is an abbreviation of the 5th Generation mobile communication technology (the 5G communication technology), and the 5G communication system is also called an NR (New Radio) system or a 5G NR system.

Optionally, the first antenna module 120 includes a ground region, a radiator, and a feeding point connected to the radiator. The grounding area is connected with the radiator, and a grounding point is formed on the grounding area. The ground point may be used to implement grounding of the radiator. In some embodiments, the number of ground points is 1. In other embodiments, the number of ground points is multiple, such as 2, 3, or even more. By arranging a plurality of grounding points, the frequency band requirements of different operator versions can be realized. The radiator refers to a portion for radiating electromagnetic waves outward. The feeding point may also be referred to as a power supply point, and may be used to feed a radio frequency signal to the radiator. For example, the feed point may be coupled to radio frequency circuitry for receiving radio frequency signals from the radio frequency circuitry and transmitting the radio frequency signals through the radiator.

Alternatively, the first Antenna module 120 includes an IFA (Inverted-F Antenna) or LDS (Laser Direct Structuring) Antenna or FPC (Flexible Printed Circuit) Antenna or monopole Antenna or T-shaped Antenna. The IFA antenna is an inverted English letter F antenna with a shape similar to that of the IFA antenna; the LDS antenna is an antenna formed by an LDS technology, the LDS technology is a technology capable of directly radiusing the antenna on a non-metal carrier of the terminal, and the LDS antenna has the characteristics of stable performance, short manufacturing process, strong anti-interference capability, high space utilization rate of the terminal and the like; the FPC antenna is an antenna formed by FPC technology, is connected through a feeder line, can be usually adhered to a terminal nonmetal carrier by using a back adhesive, and has the characteristics of good performance, free installation, low cost, high gain and the like; a monopole antenna refers to a vertical antenna with a quarter wavelength; the T-shaped antenna is an antenna shaped like English letter T.

In the embodiment of the present application, the number of radiators included in the first antenna module 120 is not limited. The first antenna module 120 may include one radiator or a plurality of radiators. In addition, in the embodiment of the present application, the operating frequency band of each radiator included in the first antenna module 120 is not limited, and the operating frequency band may be designed according to actual requirements. Illustratively, the first antenna module 120 includes four radiators, wherein all four radiators are used for radiating high-frequency signals, or two radiators are used for radiating low-frequency signals, and the other two radiators are used for radiating high-frequency signals. The first target region 111 is a region including the four radiators in the radiation direction.

In the exemplary embodiment, first target area 111 may also be referred to as an antenna window. The antenna window is an important component of an antenna system, is used for providing physical protection for an antenna body and has wave-transmitting performance corresponding to the working frequency band of the antenna. The specific location of the first target area 111 on the body 110 can be properly designed according to the working requirement of the first antenna module 120 and the location where the first antenna module 120 is disposed.

When the local temperature of the first antenna module 120 reaches the phase change point of the first phase change material, the first phase change material is converted from a non-metallic state to a metallic state; when the local temperature of the first antenna module 120 is lower than the phase change point of the first phase change material, the first phase change material is changed from the metallic state to the non-metallic state. At normal temperature, the first phase change material shows a non-metal state, and the radio frequency signal radiated by the first antenna module 120 can be transmitted through the first target region 111; after the first antenna module 120 operates for a period of time, since the first antenna module 120 generates heat greatly, the local temperature rises to the phase change point of the first phase change material, the first phase change material is converted from a non-metal state to a metal state, the radio frequency signal radiated by the first antenna module 120 cannot pass through the first target area 111 to be emitted, and the terminal 100 controls the first antenna module 120 to stop operating. In an exemplary embodiment, the terminal 100 may detect the strength of the signal received by the first antenna module 120, when the strength of the signal received by the first antenna module 120 is lower than a preset strength, the terminal 100 determines that the radio frequency signal radiated by the first antenna module 120 cannot pass through the first target area 111, at this time, the temperature of the first antenna module 120 is higher, and the terminal 100 controls the first antenna module 120 to stop working and switches to another antenna module to work, so as to perform over-temperature protection on the first antenna module 120, and prevent the first antenna module 120 from being damaged due to over-high temperature. In addition, the first antenna module 120 can be protected without a complex external circuit in the embodiment of the present application. In a possible implementation manner, when the first phase change material is converted from the metal state to the non-metal state, the radio frequency signal radiated by the first antenna module 120 may be transmitted through the first target area 111, and the terminal 100 may select the antenna module with the highest received signal strength by detecting the strength of the received signal of each antenna module, so as to control the operation of the antenna module.

In a possible implementation, the first phase change material comprises VO₂A phase change material. VO (vacuum vapor volume)₂Is the most studied of the many vanadium oxides, not least because of VO₂The material has obvious mutation property, and more importantly, the phase change temperature of the material is 68 ℃, so that the material is a phase change material with phase change temperature close to room temperature in more phase change materials. VO (vacuum vapor volume)₂The phase change material changes between low-temperature semiconductor and high-temperature metal states in a high-speed reversible phase change manner, and when the temperature reaches VO₂At the phase transition temperature of the phase change material, VO₂The structure and the performance of the phase-change material are mutated within a nanosecond time range, the crystal is changed from monoclinic to tetragonal, and the resistance of the crystal can be mutated.

In summary, in the technical solution provided in the embodiment of the present application, the phase-change material is covered in the area in the radiation direction of the antenna module, and the phase-change material includes a metal state and a non-metal state. When the phase-change material is changed from the non-metal state to the metal state, the radio-frequency signal radiated by the antenna module cannot pass through the machine body, and the antenna module stops working, so that the antenna module is protected, and the device is prevented from being damaged by the antenna module due to overhigh temperature.

Referring to fig. 2, a schematic diagram of a terminal according to another embodiment of the present application is shown. The terminal 100 includes: the body 110, the first antenna module 120.

Alternatively, as shown in fig. 2, the body 100 includes a back plate 112, an inner surface of the back plate 112 includes the first target area 111, and the inner surface of the back plate 112 refers to a surface of the back plate 112 contacting the first antenna module 120. The back plate 112 is a back shell of the terminal 100 and is disposed on the back surface of the body 110. The back plate 112 may be a ceramic back plate, a metal back plate, or a back plate made of other materials, which is not limited in this embodiment. The specific location of the first target area 111 on the back plate 112 can be properly designed according to the working requirement of the first antenna module 120 and the location where the first antenna module 120 is disposed. For example, the first target area 111 may be located at a top region of the back plate 112, or the first target area 111 may be located at a middle region of the back plate 112, or the first target area 111 may be located at an end region of the back plate 112, which is not limited in this embodiment.

In a possible implementation manner, the terminal 100 further includes a display screen 130, the display screen 130 is disposed on the front surface of the body 110, and the display screen 130 is used for displaying images and colors. Optionally, the display screen 130 is a touch display screen, and the touch display screen has a function of receiving a touch operation (such as clicking, sliding, pressing, and the like) of a user in addition to a display function. The Display 130 may be an LCD (Liquid Crystal Display) screen or an OLED (Organic Light-Emitting Diode) screen. The display screen 130 may be a rigid screen or a flexible screen, which is not limited in this embodiment. Optionally, the back plate 112 is disposed opposite the display screen 130. As shown in fig. 3, the inner surface of the back plate 112 includes a first target area 111, the first target area 111 refers to an area in the radiation direction including the first antenna module 120, and the first target area 111 is covered with the first phase change material. For example, the first target region 111 of the inner surface of the back plate 112 is covered with VO₂A material. Optionally, the terminal 100 further includes a main board 140, and the first antenna module 120 is disposed on the main board 140.

In a possible implementation, the first target area 111 is the entire area of the inner surface of the back-plate 112. As shown in fig. 3, the first antenna module 120 includes four radiators 121, and the operating frequency bands of the four radiators 121 may be the same or different, which is not limited in this embodiment. The first target area 111 is the entire area of the inner surface of the back plate 112, which includes the area in the radiation direction of the four radiators 121. Covering the entire area of the inner surface of the back plate 112 with the first phase change material is simple to operate, and it is possible to avoid that the first target area does not include the entire area in the radiation direction due to a failure.

In summary, in the technical solution provided in the embodiment of the present application, the phase change material is covered on the entire area of the inner surface of the back plate, so that the operation is simple, and it can be avoided that the target area does not include the entire area in the radiation direction due to a failure.

Referring to fig. 4, a schematic diagram of a terminal according to another embodiment of the present application is shown. The terminal 100 includes: the body 110, the first antenna module 120.

Optionally, the body 110 includes a middle frame 113, an inner surface of the middle frame 113 includes the first target area 111, and the inner surface of the middle frame 113 refers to a surface of the middle frame 113 contacting the first antenna module 120. The first target area 111 is covered with a first phase change material, the first target area 111 is meant to include an area located in a radiation direction of the first antenna module, and the first phase change material includes a metal state and a non-metal state. When the first phase change material changes from the non-metallic state to the metallic state, the first antenna module 120 stops operating.

The body 110 includes a middle frame 113, and the middle frame 113 is a frame around the body 110. The first target area 111 may also be referred to as an antenna window. The specific location of the first target area 111 on the middle frame 113 may be designed according to the working requirement of the first antenna module 120 and the location where the first antenna module 120 is disposed. For example, the first target area 111 may be located on a middle frame 113 on the top of the body 110, and in some other embodiments, the first target area 111 may also be located on a middle frame 113 on the bottom of the body 110, or on a middle frame 113 on the side of the body 110, which is not limited in this embodiment.

The middle frame 113 may be a metal middle frame or a ceramic middle frame, and in other possible implementations, the middle frame 113 may also be a middle frame made of other materials, which is not limited in this embodiment of the present application.

In a possible implementation manner, the first target region 111 is coated with the first phase change material, or the injection molding material of the first target region 111 is doped with particles of the first phase change material. In the illustrative embodiment, the first target area 111 has a length of 25 millimeters and a width of 4 millimeters.

In the exemplary embodiment, first target area 111 is an entire area of the inner surface of middle frame 113. As shown in fig. 5, the first antenna module 120 includes four radiators 121, and the operating frequency bands of the four radiators 121 are the same or different, which is not limited in this embodiment. The first target area 111 is the entire area of the inner surface of the middle frame 113, which includes the areas in the radiation direction of the four radiators. The first phase change material is covered on the whole area of the inner surface of the middle frame 113, the operation is simple, and the first target area can be prevented from not including the whole area in the radiation direction due to the fault.

In summary, in the technical solution provided by the embodiment of the present application, the phase change material is covered on the entire area of the inner surface of the middle frame, so that the operation is simple, and it can be avoided that the target area does not include the entire area in the radiation direction due to a fault.

Please refer to fig. 6, which illustrates a schematic diagram of a terminal according to another embodiment of the present application. The terminal 100 includes: the body 110, the first antenna module 120.

Optionally, the terminal 100 further includes a second antenna module 150.

When the first phase change material changes from the non-metal state to the metal state, the first antenna module 120 stops working, and the second antenna module 150 starts working. When the strength of the signal received by the first antenna module 120 is lower than the preset strength, the terminal 100 determines that the radio frequency signal radiated by the first antenna module 120 cannot pass through the first target area 111, and at this time, the temperature of the first antenna module 120 is higher, and the terminal 100 controls the first antenna module 120 to stop working and switches to the second antenna module 150 to start working.

In a possible implementation manner, the second target area 114 of the body 100 is covered with a second phase change material, where the second target area 114 is an area located in the radiation direction of the second antenna module 150, and the second phase change material includes a metal state and a non-metal state; when the second phase change material changes from the non-metal state to the metal state, the second antenna module 150 stops working. In a possible implementation manner, the terminal 100 may further include a third antenna module or even more antenna modules, and at this time, the terminal 100 may select the antenna module with the highest received signal strength to control its operation.

In the exemplary embodiment, second antenna module 150 includes a millimeter-wave antenna. Millimeter wave antennas have different design architectures and directions, and the more mainstream direction is generally based on a phased array (phased antenna) manner, and the implementation manners of the phased array millimeter wave antenna can be mainly divided into three types: AoB (Antenna on Board), i.e., Antenna array located on the system motherboard, AiP (packaged Antenna), i.e., Antenna array located in the Package of the chip, AiM (Antenna in Module), i.e., Antenna array and RFIC (Radio Frequency Integrated Circuit) form a Module.

Optionally, the second antenna module 150 may support a 5G frequency band, such as an n257 frequency band (26.5-29.5GHz), an n258 frequency band (24.25-27.5GHz), an n261 frequency band (27.5-28.35GHz), and an n260 frequency band (37-40GHz) in the 5G frequency band. In a possible implementation manner, the second antenna module 150 can support both the 5G band and the 4G band. In the embodiment of the present application, 4G is the abbreviation of the 4th Generation mobile communication technology (the 4G communication system), and the 4G communication system may also be referred to as an LTE (Long Term Evolution) system. The 5G is an abbreviation of the 5th Generation mobile communication technology (the 5G communication technology), and the 5G communication system is also called an NR (New Radio) system or a 5G NR system.

Optionally, the second antenna module 150 includes a ground region, a radiator, and a feeding point connected to the radiator. The grounding area is connected with the radiator, and a grounding point is formed on the grounding area. The ground point may be used to implement grounding of the radiator. In some embodiments, the number of ground points is 1. In other embodiments, the number of ground points is multiple, such as 2, 3, or even more. By arranging a plurality of grounding points, the frequency band requirements of different operator versions can be realized. The radiator refers to a portion for radiating electromagnetic waves outward. The feeding point may also be referred to as a power supply point, and may be used to feed a radio frequency signal to the radiator. For example, the feed point may be coupled to radio frequency circuitry for receiving radio frequency signals from the radio frequency circuitry and transmitting the radio frequency signals through the radiator.

Alternatively, the second Antenna module 150 includes an IFA (Inverted-F Antenna) or LDS (Laser Direct Structuring) Antenna or FPC (Flexible Printed Circuit board) Antenna or monopole Antenna or T-shaped Antenna. The IFA antenna is an inverted English letter F antenna with a shape similar to that of the IFA antenna; the LDS antenna is an antenna formed by an LDS technology, the LDS technology is a technology capable of directly radiusing the antenna on a non-metal carrier of the terminal, and the LDS antenna has the characteristics of stable performance, short manufacturing process, strong anti-interference capability, high space utilization rate of the terminal and the like; the FPC antenna is an antenna formed by FPC technology, is connected through a feeder line, can be usually adhered to a terminal nonmetal carrier by using a back adhesive, and has the characteristics of good performance, free installation, low cost, high gain and the like; a monopole antenna refers to a vertical antenna with a quarter wavelength; the T-shaped antenna is an antenna shaped like English letter T.

In the embodiment of the present application, the number of radiators included in the second antenna module 150 is not limited. The second antenna module 150 may include one radiator or a plurality of radiators. In addition, in the embodiment of the present application, the operating frequency band of each radiator included in the second antenna module 150 is not limited, which may be designed according to actual requirements. For example, the second antenna module 150 includes four radiators, wherein all four radiators are used for radiating high-frequency signals, or two radiators are used for radiating low-frequency signals, and the other two radiators are used for radiating high-frequency signals. The second target region 114 is a region including the four radiators in the radiation direction.

In the exemplary embodiment, second target area 114 may also be referred to as an antenna window. The antenna window is an important component of an antenna system, is used for providing physical protection for an antenna body and has wave-transmitting performance corresponding to the working frequency band of the antenna. The specific location of the second target region 114 on the body 110 can be properly designed according to the operation requirement of the second antenna module 150 and the location where the second antenna module 150 is disposed.

When the local temperature of the second antenna module 150 reaches the phase transition point of the second phase change material, the second phase change material is converted from a non-metal state to a metal state; when the local temperature of the second antenna module 150 is lower than the phase transition point of the second phase change material, the second phase change material changes from the metal state to the non-metal state. At normal temperature, the second phase change material shows a non-metal state, and the radio frequency signal radiated by the second antenna module 150 can be transmitted through the second target region 114; after the second antenna module 150 works for a period of time, since the second antenna module 150 generates heat greatly, the local temperature rises to the phase change point of the second phase change material, the second phase change material is converted from a non-metal state to a metal state, the radio frequency signal radiated by the second antenna module 150 cannot pass through the second target region 114 to be transmitted, and the terminal 100 controls the second antenna module 150 to stop working. In an exemplary embodiment, the terminal 100 may detect the strength of the signal received by the second antenna module 150, when the strength of the signal received by the second antenna module 150 is lower than the predetermined strength, the terminal 100 determines that the radio frequency signal radiated by the second antenna module 150 cannot pass through the second target region 114, at this time, the temperature of the second antenna module 150 is higher, and the terminal 100 controls the second antenna module 150 to stop working and switches to another antenna module to work, so as to perform over-temperature protection on the second antenna module 150, and prevent the second antenna module 150 from being damaged due to over-high temperature. In addition, the second antenna module 150 can be protected without a complex external circuit. In a possible implementation manner, when the second phase change material is converted from the metal state to the non-metal state, the radio frequency signal radiated by the second antenna module 150 may be transmitted through the second target area 114, and the terminal 100 may select the antenna module with the highest received signal strength by detecting the strength of the received signal of each antenna module, so as to control the operation of the antenna module.

Alternatively, the second phase change material and the first phase change material may be the same phase change material or may be different phase change materials. In possible implementations, the second phase change material includes VO₂A phase change material. VO (vacuum vapor volume)₂Is the most studied of the many vanadium oxides, not least because of VO₂The material has obvious mutation property, and more importantly, the phase change temperature of the material is 68 ℃, so that the material is a phase change material with phase change temperature close to room temperature in more phase change materials. VO (vacuum vapor volume)₂The phase change material changes between low-temperature semiconductor and high-temperature metal states in a high-speed reversible phase change manner, and when the temperature reaches VO₂At the phase transition temperature of the phase change material, VO₂The structure and the performance of the phase-change material are mutated within a nanosecond time range, the crystal is changed from monoclinic to tetragonal, and the resistance of the crystal can be mutated.

The above description is only exemplary of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like that are made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A terminal, characterized in that the terminal comprises: the antenna comprises a machine body and a first antenna module;

when the first phase change material is changed from a non-metal state to a metal state, the first antenna module stops working;

the first antenna module comprises a grounding area, a radiator and a feed point connected with the radiator, wherein the grounding area is connected with the radiator, a grounding point is formed on the grounding area, and the grounding point is used for grounding the radiator.

2. The terminal of claim 1, wherein the body comprises a back plate, wherein an inner surface of the back plate comprises the first target area, and the inner surface of the back plate is a surface of the back plate contacting the first antenna module.

3. A terminal according to claim 2, wherein the first target area is the entire area of the inner surface of the back-plate.

4. The terminal of claim 1, wherein the body comprises a middle frame, wherein an inner surface of the middle frame comprises the first target area, and the inner surface of the middle frame is a surface of the middle frame contacting the first antenna module.

5. A terminal according to claim 4, characterized in that the first target area is coated with the first phase change material or the injection moulding material of the first target area is doped with particles of the first phase change material.

6. A terminal according to claim 4, wherein the first target area is the full area of the inner surface of the middle frame.

7. The terminal of claim 1, further comprising a second antenna module;

when the first phase change material is changed from a non-metal state to a metal state, the first antenna module stops working, and the second antenna module starts working.

8. The terminal of claim 7, wherein a second target area of the body is covered with a second phase change material, the second target area including an area in a radiation direction of the second antenna module, the second phase change material including a metallic state and a non-metallic state;

and when the second phase change material is changed from a non-metal state to a metal state, the second antenna module stops working.

9. A terminal as claimed in any one of claims 1 to 8, characterised in that the phase change material comprises VO₂A phase change material.

10. A terminal as claimed in claim 9, characterized in that the VO is a subscriber terminal₂The phase-change material is doped with ions with high valence state or ions with low valence state.