Patent Description:
As usage scenarios of a terminal device continuously increase, structure types of the terminal device begin to increase. The most common structure types are bar-type terminal devices and foldable terminal devices. Designs of antennas in the terminal device vary according to the structure types of the terminal device.

The foldable terminal device has two parts that are relatively movable (for example, relatively sliding and relatively rotating). For example, one part <NUM> may rotate relative to a side of another part <NUM>. For another example, one part may slide on a surface of another part. Therefore, the foldable terminal device may have a bar-type mode in which a cover is opened and a folded mode in which a cover is closed. For example, the foldable terminal device includes the part <NUM> and the part <NUM>. After the part <NUM> rotates relative to one end of the part <NUM>, a surface of the part <NUM> is in contact with and coincides with a surface of the part <NUM>, and the two surfaces cannot be exposed. In this case, the foldable terminal device is in the folded mode in which the cover is closed. However, after the part <NUM> rotates relative to one end of the part <NUM>, the two surfaces are no longer in contact and are exposed. In this case, the foldable terminal device may be in the bar-type mode in which the cover is opened. For another example, the foldable terminal device includes a part <NUM> and a part <NUM>. After the part <NUM> slides on the part <NUM>, a projection area that is of a surface of the part <NUM> and that is on the part <NUM> coincides with a surface of the part <NUM>. In this case, the foldable terminal device is in the folded mode in which the cover is closed. However, after the part <NUM> slides on the part <NUM>, the projection area no longer coincides with the surface of the part <NUM>. In this case, the foldable terminal device may be in the bar-type mode in which the cover is opened.

However, in the two modes, use performance of antennas that are of the two relatively movable parts and that have different relative positions and a same operating frequency band is likely to change. This affects stability of antenna signals. To ensure stable use of an antenna in the two modes, a plurality of antennas with a same operating frequency band usually need to be disposed on the two relatively movable parts of the terminal device. Therefore, antenna arrangement and connection methods become complex.

<CIT> discloses a mobile terminal which solves the problem that the radiation capability of the antenna is poor when the mobile terminal is in the folded state.

<CIT> discloses an electronic device that is configurable to be transitioned from a first operating mode having a first form factor to a second operating mode having a second form factor.

<CIT> discloses an antenna apparatus which can be used in an electronic device having a flexible display which can be bent at a rotating shaft. The flexible display includes a primary screen and a secondary screen, and the primary screen and the secondary screen are connected by using the rotating shaft.

This application provides a foldable terminal device, to provide a foldable terminal device with a simple structure and high antenna performance.

According to a first aspect, a foldable terminal device as defined in claim <NUM> is provided. According to a second aspect, a foldable terminal device as defined in claim <NUM> is provided.

In these aspects of this application, when the foldable terminal device is in a folded mode, the second part is relatively close to the first part, and an electronic element disposed in the second part affects an electronic element disposed in the first part. This application uses such impact in a way that the second antenna element disposed in the second part and the first antenna element disposed in the first part are coupled for feeding and operate in a same frequency band. In this way, signal interference caused by a distance change can be avoided, and use performance of antennas can be improved. Because the first antenna element and the second antenna element are not directly electrically connected by using a conducting wire, but are electrically connected in a coupling manner, existence of the second antenna element does not additionally introduce a problem of wiring difficulty.

With reference to the first and second aspects, the first antenna element includes: a first antenna radiator, including a first connection point and a second connection point. The first connection point of the first antenna radiator is grounded, and the second connection point of the first antenna radiator is electrically connected to the first feed source. The second antenna element includes: a second antenna radiator, configured to couple to the first antenna radiator for coupled feeding when the foldable terminal device is folded, and including a third connection point and a fourth connection point, where both the third connection point of the second antenna radiator and the fourth connection point of the second antenna radiator are grounded, and a first tuning element, electrically connected between a ground and the third connection point of the second antenna radiator, and configured to adjust the operating frequency band of the second antenna element to include the operating frequency band of the first antenna element.

When the first antenna element and the second antenna element are coupled for feeding, the operating frequency band of the second antenna element may be slightly different from the operating frequency band of the first antenna element, and a coincidence degree between the operating frequency band of the second antenna element and the operating frequency band of the first antenna element does not meet a requirement. The operating frequency band of the second antenna element is adjusted by using a tuning element, so that coupling feeding efficiency between the first antenna radiator and the second antenna radiator can be improved.

With reference to the first and second aspects, when the foldable terminal device is folded, a distance between the first connection point of the first antenna radiator and the third connection point of the second antenna radiator is less than a first preset threshold, and a distance between the second connection point of the first antenna radiator and the fourth connection point of the second antenna radiator is less than a second preset threshold; or a distance between the first connection point of the first antenna radiator and the fourth connection point of the second antenna radiator is less than the first preset threshold, and a distance between the second connection point of the first antenna radiator and the third connection point of the second antenna radiator is less than the second preset threshold.

A distance between the first antenna radiator and the second antenna radiator is relatively close, so that coupling feeding efficiency between the first antenna radiator and the second antenna radiator can be improved.

With reference to the first and second aspects, the first part includes a first frame, and the second part includes a second frame; and the first antenna element is disposed around the first frame, the second antenna element is disposed around the second frame, and when the foldable terminal device is folded, the first frame and the second frame are located on a same side of the foldable terminal device.

The first antenna element and the second antenna element are disposed on the same side of the foldable terminal device, so that coupling feeding efficiency between the first antenna radiator and the second antenna radiator can be improved.

With reference to the first and second aspects, the first antenna radiator is the first frame, and the second antenna radiator is the second frame.

By using a frame as an antenna radiator, a structure of the foldable terminal device can be simplified.

With reference to the first and second aspects, the first antenna element is fed by the first feed source and operates on a first frequency band. The foldable terminal device further includes: a third feed source, where the first antenna element is fed by the third feed source and operates on a second frequency band; a first filtering element, electrically connected between the first feed source and the first antenna element, and configured to filter a signal of the second frequency band; and a second filtering element, electrically connected between the third feed source and the first antenna element, and configured to filter a signal of the first frequency band.

A filter is configured to filter a signal of a specific frequency band, to avoid interference between different frequency bands, so that the first antenna element can operate in a plurality of frequency bands.

With reference to the first aspect, in some implementations of the first aspect, the foldable terminal device further includes: a second tuning element, electrically connected to the first antenna element, and configured to adjust the second frequency band.

A tuning element may enable the first antenna element to multiplex a plurality of antennas, so that the first antenna element can operate in a plurality of frequency bands.

With reference to the first and second aspects, the second antenna element is coupled to and fed by the first antenna element and operates on a third frequency band, and the third frequency band is the same as the first frequency band. The foldable terminal device further includes: a fourth feed source, where the second antenna element is fed by the fourth feed source and operates on a fourth frequency band; a third filtering element, electrically connected between the ground and the second antenna element, and configured to filter a signal of the fourth frequency band; and a fourth filtering element, electrically connected between the fourth feed source and the second antenna element, and configured to filter a signal of the third frequency band.

The filter is configured to filter a signal of a specific frequency band, to avoid interference between different frequency bands, so that the second antenna element can operate in a plurality of frequency bands.

With reference to the first and second aspects, the foldable terminal device further includes: a third tuning element, electrically connected to the second antenna element, and configured to adjust the fourth frequency band.

The tuning element may enable the second antenna element to multiplex a plurality of antennas, so that the second antenna element can operate in a plurality of frequency bands.

With reference to the first and second aspects, when the foldable terminal device is unfolded, the first antenna element is fed by the first feed source and operates on the first frequency band; and the second antenna element does not operate or operates on another frequency band different from the first frequency band.

When a distance between the first antenna element and the second antenna element is relatively long, the first antenna element may operate independently, and use performance of the foldable terminal device is not changed.

With reference to the first and second aspects, the operating frequency band of the first antenna element includes an operating frequency band of a near field communication NFC antenna.

Both a first part side and a second part side of the foldable terminal device may be used in an NFC application scenario, thereby improving use performance of the foldable terminal device.

Because two movable parts of the foldable terminal device may move relatively, an antenna position in the foldable terminal device may also move relatively. When the foldable terminal device is in an bar-type mode, a distance between antennas is relatively long, and impact between the antennas is relatively small. However, when the foldable terminal device is in a folded mode, the distance between the antennas is relatively close, and the impact between the antennas (for example, interference between the antennas and impact on antenna performance) cannot be ignored. Antennas with a same operating frequency band are disposed on the two movable parts of the foldable terminal device, and the antennas may be fed by a same feed source through a feeding line. This introduces a problem of complex arrangement of feeding lines. This application uses such impact in a way that the second antenna element disposed in the second part and the first antenna element disposed in the first part are coupled for feeding and operate in a same frequency band. In this way, signal interference caused by a distance change can be avoided, and use performance of antennas can be improved. Because the first antenna element and the second antenna element are not directly electrically connected by using a conducting wire, but are electrically connected in a coupling manner, existence of the second antenna element does not additionally introduce a problem of wiring difficulty.

Terms used in the following embodiments are merely intended to describe specific embodiments, but are not intended to limit this application. Terms "one", "a", "the", "the foregoing", "this", and "the one" of singular forms used in this specification and the appended claims of this application are also intended to include plural forms like "one or more", unless otherwise specified in the context clearly. It should be further understood that, in the embodiments of this application, "one or more" means one, two, or more. In addition, "and/or" describes an association relationship between associated objects, and indicates that three relationships may exist. For example, A and/or B may indicate the following cases: only A exists, both A and B exist, and only B exists, where A and B may be singular or plural. The character "/" generally indicates an "or" relationship between the associated objects.

Reference to "an embodiment", "some embodiments", or the like described in this specification indicates that one or more embodiments of this application include a specific feature, structure, or characteristic described with reference to the embodiments. Therefore, in this specification, statements, such as "in an embodiment", "in some embodiments", "in some other embodiments", and "in other embodiments", that appear at different places do not necessarily mean referring to a same embodiment, instead, the statements mean referring to "one or more but not all of the embodiments", unless otherwise specifically emphasized in other ways. Terms "include", "comprise", "have", and variants of the terms all mean "include but are not limited to", unless otherwise specifically emphasized in other ways.

The following describes specific implementations of the embodiments of this application in more detail with reference to specific examples. It should be noted that the examples below are merely intended to help a person skilled in the art understand the embodiments of this application, instead of limiting the embodiments of this application to a specific value or a specific scenario shown in the example.

The foldable terminal device provided in this embodiment of this application may be a further improvement on the basis of an existing foldable terminal device. Generally, one outer frame of the foldable terminal device may approach another outer frame of the foldable terminal device from a relatively far distance. The foldable terminal device usually includes a slide-type terminal device and a flip-type terminal device. A common foldable terminal device in daily life includes a foldable mobile phone.

A flip-type mobile phone is used as an example. As shown in <FIG>, the flip-type mobile phone <NUM> includes an outer housing <NUM>, a rotating shaft <NUM>, and an inner housing <NUM>. An outer screen is mounted on the outer housing <NUM>, and an inner screen is mounted on the inner housing <NUM>.

It should be understood that the housing in this application includes a display surface and a reverse surface of the display surface. In other words, the housing has two surfaces. One surface may display a user interface, and the other surface may integrate circuits to connect to and communicate with another module of the mobile phone.

Optionally, when the outer housing <NUM> and the inner housing <NUM> are in a mode in which the flip-type mobile phone <NUM> is not flipped open (that is, the outer screen and the inner screen are folded to each other), the outer screen and the inner screen may be considered as two screens. When the flip-type mobile phone <NUM> is flipped open (that is, the outer screen and the inner screen are not folded to each other), the outer screen and the inner screen may form an entire screen, that is, the outer screen and the inner screen may actually be an entire flexible screen, but when folded, the outer screen and the inner screen are visually located on the two housings and form two screens.

Optionally, regardless of a mode of the flip-type mobile phone <NUM>, the outer screen and the inner screen may be independent and are located on two housings connected by using the rotating shaft <NUM>.

It should be understood that the foldable terminal device provided in this embodiment of this application is applicable to both a flexible screen and a non-flexible screen, and a screen material is not limited in this application.

It should be further understood that <FIG> is a schematic form, and the mobile phone further includes another part or module, but is not shown in <FIG>. Because this application mainly relates to a locking apparatus for controlling opening and closing between the outer housing <NUM> and the inner housing <NUM> shown in <FIG> shows only a part of the terminal device mainly involved in this application.

<FIG> is a schematic diagram of another foldable terminal device in an unfolded mode. <FIG> is a schematic diagram of appearance of the electronic device at six different angles: a front surface, a back surface, a bottom surface, a top surface, a left surface, and a right surface. <NUM> in the front view is a flexible screen component of the electronic device. <NUM> and <NUM> in the rear view are housings of the electronic device, for example, a first housing and a second housing. A dashed-line box shows a bending area <NUM> of the electronic device.

<FIG> is a schematic diagram of the foldable terminal device in a folded mode. As shown in <FIG>, when the two housings rotate to be in the folded mode (an angle is <NUM> degrees), the bending structure <NUM> deforms, and the first housing <NUM> and the second housing <NUM> are stacked. The bending structure <NUM> may be a known bending structure used on a foldable terminal. In addition, when the first housing <NUM> is rotatably connected to the second housing <NUM>, a component such as a common rotating shaft that can implement rotatable connection may also be used to perform the rotatable connection.

It should be understood that, for the foldable terminal device, the bending area <NUM> may be disposed longitudinally, and a flexible screen may be folded left and right along the longitudinally disposed bending area, as shown in <FIG>. Alternatively, the bending area <NUM> may be disposed horizontally, and the flexible screen may be folded up and down along the horizontally disposed bending area, as shown in <FIG>.

It should be further understood that, when the foldable terminal device is unfolded, a left screen may be folded in a direction facing a right screen, or may be folded in a direction opposite to the right screen. In the description of this embodiment of this application, an example in which the flexible screen component <NUM> shown in <FIG> is located on an outer surface of the foldable terminal device after folding is used for description. This is not limited in this application.

It should be further understood that <FIG> use an example in which the terminal device is a mobile phone. Actually, the terminal device in the technical solutions of the embodiments of this application may refer to user equipment, an access terminal, a user unit, a user station, a mobile station, a mobile console, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communications device, a user agent, or a user apparatus. The terminal device may alternatively be a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal digital assistant, PDA), a handheld device having a wireless communication function, a computing device, another processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future <NUM> network, or a terminal device in a future evolved public land mobile network (public land mobile network, PLMN). This is not limited in the embodiments of this application.

In the embodiments of this application, the terminal device includes a hardware layer, an operating system layer running above the hardware layer, and an application layer running above the operating system layer. The hardware layer includes hardware such as a central processing unit (central processing unit, CPU), a memory management unit (memory management unit, MMU), and a memory (which is also referred to as a main memory). The operating system may be any one or more computer operating systems that implement service processing by using a process (process), for example, a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. The application layer includes applications such as a browser, an address book, word processing software, and instant messaging software.

In addition, aspects or features of this application may be implemented as a method, an apparatus or a product that uses standard programming and/or engineering technologies. The term "product" used in this application covers a computer program that can be accessed from any computer-readable component, carrier or medium. For example, the computer-readable medium may include but is not limited to: a magnetic storage component (for example, a hard disk, a floppy disk, or a magnetic tape), an optical disc (for example, a compact disc (compact disc, CD), and a digital versatile disc (digital versatile disc, DVD)), a smart card and a flash memory component (for example, erasable programmable read-only memory (erasable programmable read-only memory, EPROM), a card, a stick, or a key drive). In addition, various storage media described in this specification may indicate one or more devices and/or other machine-readable media that are configured to store information. The term "machine-readable media" may include but is not limited to a radio channel, and various other media that can store, contain, and/or carry instructions and/or data.

The foldable terminal device may have a folded mode and a bar-type mode. The folded mode may mean that one frame of the foldable terminal device approaches another frame of the foldable terminal device from a relatively far distance, and is sometimes referred to as a cover-closed mode. The bar-type mode may be, for example, an initial mode before the occurrence of the above-described "approaching" process, and may sometimes be referred to as a cover-opened mode.

In the two different modes, relative positions of electronic elements in the foldable terminal device are different. In the folded mode and in the bar-type mode, the foldable terminal device sometimes has different use performance. Changing relative positions of antennas in the foldable terminal device usually causes a change in use performance of the antennas. This affects user experience.

To resolve the foregoing disadvantage, this application provides a foldable terminal device, to unify use performance of the foldable terminal device and improve user experience.

<FIG> is a schematic structural diagram of a foldable terminal device <NUM> according to an embodiment of this application. The foldable terminal device <NUM> includes a first part <NUM> and a second part <NUM> that are foldable. It should be understood that, when the foldable terminal device <NUM> is in a folded mode, a frame of the first part <NUM> may be close to a frame of the second part <NUM>, and the first part <NUM> and the second part <NUM> are configured to be folded.

The first part <NUM> is configured with a first antenna element <NUM>, and the second part <NUM> is configured with a second antenna element <NUM>. The terminal device <NUM> further includes a first feed source <NUM> that feeds the first antenna element <NUM>, so that the first antenna element <NUM> can operate in an operating frequency band.

When the foldable terminal device <NUM> is folded, the second antenna element <NUM> is coupled to the first antenna element <NUM> for coupled feeding, so that the second antenna element <NUM> can operate in the operating frequency band of the first antenna element <NUM>.

It should be understood that the "first part <NUM>" and the "second part <NUM>" may be two components on the foldable terminal device <NUM>, for example, may be a display <NUM> and a display <NUM>, or may be a frame <NUM> and a frame <NUM>. The "first part <NUM>" and the "second part <NUM>" may alternatively be two areas of the foldable terminal device <NUM>, for example, may be a top area and a bottom area of the foldable terminal device <NUM>, or for another example, may be an exposed area and an included area of the foldable terminal device <NUM>.

In this embodiment of this application, an "antenna element" is an entity module that has a function of receiving a signal or sending a signal. One antenna element may operate in one or more frequency bands.

In this embodiment of this application, specific positions of the first antenna element <NUM> and the second antenna element <NUM> in the foldable terminal device <NUM> are not limited. For example, the first antenna element <NUM> may be located at an earpiece end of the foldable terminal device <NUM>, and the second antenna element <NUM> may be located at a microphone end of the foldable terminal device <NUM>. Alternatively, the first antenna element <NUM> may be located at the microphone end of the foldable terminal device <NUM>, and the second antenna element <NUM> may be located at the earpiece end of the foldable terminal device <NUM>. It should be understood that, in this embodiment of this application, a position of the first antenna element <NUM> and a position of the second antenna element <NUM> may be exchanged.

Optionally, the first part <NUM> includes a first frame, and the second part <NUM> includes a second frame; and the first antenna element <NUM> is disposed around the first frame, the second antenna element <NUM> is disposed around the second frame, and when the foldable terminal device <NUM> is folded, the first frame and the second frame are located on a same side of the foldable terminal device <NUM>.

<FIG> is a schematic diagram of the foldable terminal device <NUM> in a bar-type mode. The first antenna element <NUM> is disposed near the first frame on the left of the top of the foldable terminal device <NUM>, and the second antenna element <NUM> is disposed near the second frame on the right of the top of the foldable terminal device <NUM>. When the foldable terminal device <NUM> is folded along a bendable middle area, both the first frame and the second frame are located on the top of the foldable terminal device <NUM>, that is, located on the same side of the foldable terminal device <NUM>.

<FIG> is a schematic diagram of the foldable terminal device <NUM> in a bar-type mode. The first antenna element <NUM> is disposed near the first frame on the left of the center of the foldable terminal device <NUM>, and the second antenna element <NUM> is disposed near the second frame on the right of the center of the foldable terminal device <NUM>. When the foldable terminal device <NUM> is folded along the bendable middle area, both the first frame and the second frame are located on the same side of the foldable terminal device <NUM>.

<FIG> is a schematic diagram of the foldable terminal device <NUM> in a bar-type mode. The first antenna element <NUM> is disposed near the first frame on the top of the foldable terminal device <NUM>, and the second antenna element <NUM> is disposed near the second frame on the bottom of the foldable terminal device <NUM>. When the foldable terminal device <NUM> is folded along the bendable middle area, both the first frame and the second frame are located on the top of the foldable terminal device <NUM>, that is, located on the same side of the foldable terminal device <NUM>.

<FIG> is a schematic diagram of the foldable terminal device <NUM> in a bar-type mode. The first antenna element <NUM> is disposed near the first frame on the left of the bottom of the foldable terminal device <NUM>, and the second antenna element <NUM> is disposed near the second frame on the right of the bottom of the foldable terminal device <NUM>. When the foldable terminal device <NUM> is folded along the bendable middle area, both the first frame and the second frame are located on the bottom of the foldable terminal device <NUM>, that is, located on the same side of the foldable terminal device <NUM>.

When the foldable terminal device <NUM> is folded, the first frame and the second frame are located on the same side of the foldable terminal device <NUM>. In this case, the first antenna element <NUM> is relatively close to the second antenna element <NUM>, so that a coupling feeding effect is better. In addition, the first antenna element <NUM> and the second antenna element <NUM> are relatively close to the frames of the foldable terminal device <NUM>, so that signals can be easily radiated.

In this embodiment of this application, the first antenna element <NUM> and the second antenna element <NUM> may not be disposed at positions on the foldable terminal device <NUM> that are near the frames.

Coupling feeding generally means that two circuit elements conduct electrical energy in a coupling manner. The dashed line in <FIG> shows that the first antenna element <NUM> is coupled to the second antenna element <NUM> for coupled feeding, that is, the first antenna element <NUM> conducts electrical energy to the second antenna element <NUM> in a coupling manner. To meet use performance of the antenna, in this embodiment of this application, "coupling feeding" may refer to implementing, in a coupling manner, feeding that meets a preset condition. For example, when the antenna is normally used, parameters such as coupling feeding efficiency and coupling feeding strength meet preset conditions.

It should be understood that, that the second antenna element <NUM> operates on the operating frequency band of the first antenna element <NUM> may mean that the second antenna element <NUM> operates on a part or all of the operating frequency band of the first antenna element <NUM>. For example, when the foldable terminal device <NUM> is folded, the first antenna element <NUM> is fed by the first feed source <NUM>, so that the first antenna element <NUM> can operate in a frequency band <NUM>. The second antenna element <NUM> is coupled to and fed by the first antenna element <NUM>, so that the second antenna element <NUM> can operate in the frequency band <NUM>. For another example, the first antenna element <NUM> is fed by the first feed source <NUM>, so that the first antenna element <NUM> can operate in the frequency band <NUM>, and the first antenna element <NUM> is further fed by another feed source, so that the first antenna element <NUM> can operate in a frequency band <NUM>. When the foldable terminal device <NUM> is folded, the second antenna element <NUM> is coupled to and fed by the first antenna element <NUM>, so that the second antenna element <NUM> can operate in the frequency band <NUM> or operate in the frequency band <NUM>.

It should be understood that, in addition to operating on the operating frequency band of the first antenna element <NUM>, the second antenna element <NUM> can also operate in another frequency band. For example, the foldable terminal device <NUM> includes a feed source <NUM> that feeds the second antenna element <NUM>, so that the second antenna element <NUM> can operate in a frequency band <NUM>. In addition, when the foldable terminal device <NUM> is folded, the second antenna element <NUM> is coupled to and fed by the first antenna element <NUM>, so that the second antenna element <NUM> can operate in the operating frequency band of the first antenna element <NUM>.

There are a plurality of manners of implementing an operating frequency band of the second antenna element <NUM> to be the same as that of the first antenna element <NUM>. For example, an electronic element that can play a tuning function such as an inductor or a capacitor may be used to adjust the operating frequency band of the second antenna element <NUM> to be the same as that of the first antenna element <NUM>. The manner of implementing the operating frequency band of the second antenna element <NUM> to be the same as that of the first antenna element <NUM> may be similar to that in the current technology. To avoid repetition, description is omitted herein.

It should be understood that the operating frequency band of the first antenna element <NUM> may include, for example, a frequency band of <NUM> to <NUM> that is used for communication of wireless fidelity (wireless fidelity, WiFi), Bluetooth (bluetooth®), and the like. The operating frequency band of the first antenna element <NUM> may further include, for example, a near field communication (near field communication, NFC) frequency band of <NUM>. The operating frequency band of the first antenna element <NUM> may further include, for example, frequency bands of <NUM> to <NUM> and <NUM> to <NUM> that are used for a high-speed data network (cellular) <NUM>, a high-speed data network <NUM>, and a high-speed data network <NUM>. The operating frequency band of the first antenna element <NUM> may further include an operating frequency band used for a future <NUM> network.

When the foldable terminal device <NUM> is in a bar-type mode, because the second part <NUM> is relatively far away from the first part <NUM>, the first antenna element <NUM> configured in the first part <NUM> may normally operate in a specific frequency band. However, when the foldable terminal device <NUM> is in a folded mode, the second part <NUM> is relatively close to the first part <NUM>, and an electronic element disposed in the second part <NUM> affects an electronic element disposed in the first part <NUM>. This application uses such impact in a way that the second antenna element <NUM> disposed in the second part <NUM> and the first antenna element <NUM> disposed in the first part <NUM> are coupled for feeding and operate in a same frequency band. In this way, signal interference caused by a distance change can be avoided, and use performance of antennas can be improved. For example, if both the first antenna element <NUM> and the second antenna element <NUM> operate in the NFC frequency band, a near field communication read-write (read-write) capability and a card emulation (card emulation) capability of the foldable terminal device <NUM> can be improved. Because the first antenna element <NUM> and the second antenna element <NUM> are not directly electrically connected by using a conducting wire, but are electrically connected in a coupling manner, existence of the second antenna element <NUM> does not additionally introduce a problem of wiring difficulty.

Optionally, the first antenna element <NUM> includes a first antenna radiator <NUM>. The first antenna radiator <NUM> includes a first connection point <NUM> and a second connection point <NUM>. The first connection point <NUM> of the first antenna radiator <NUM> is grounded, and the second connection point <NUM> of the second antenna radiator <NUM> is electrically connected to the first feed source <NUM>. The second antenna element <NUM> includes a second antenna radiator <NUM> and a first tuning element, and the second antenna radiator <NUM> is configured to couple to the first antenna radiator <NUM> for coupled feeding when the foldable terminal device <NUM> is folded. The second antenna radiator <NUM> includes a third connection point <NUM> and a fourth connection point <NUM>. Both the third connection point <NUM> of the second antenna radiator <NUM> and the fourth connection point <NUM> of the second antenna radiator <NUM> are grounded. The first tuning element is electrically connected between a ground and the third connection point <NUM> of the second antenna radiator <NUM>, and is configured to adjust the operating frequency band of the second antenna element <NUM> to include the operating frequency band of the first antenna element <NUM>.

As shown in <FIG>, the first antenna element <NUM> of the foldable terminal device <NUM> includes the first antenna radiator <NUM> configured to receive or send a signal. The first antenna radiator <NUM> includes one or more connection points. The first connection point <NUM> of the first antenna radiator <NUM> is grounded, and the second connection point <NUM> of the first antenna radiator <NUM> is electrically connected to the first feed source <NUM>, so that the first feed source <NUM> feeds the first antenna element <NUM>. Therefore, an area of the first antenna radiator <NUM> from the first connection point <NUM> to the second connection point <NUM> can operate in an operating frequency band. The second antenna element <NUM> of the foldable terminal device <NUM> includes the second antenna radiator <NUM> configured to receive or send a signal. The second antenna radiator <NUM> includes one or more connection points. The third connection point <NUM> of the second antenna radiator <NUM> is grounded, the fourth connection point <NUM> of the second antenna radiator <NUM> is electrically connected to one end of a tuning element, and the other end of the tuning element is grounded. When the foldable terminal device <NUM> is folded, the second antenna radiator <NUM> is coupled to the first antenna radiator <NUM> for coupled feeding. Therefore, an area of the second antenna radiator <NUM> from the third connection point <NUM> to the fourth connection point <NUM> can operate in the operating frequency band of the first antenna radiator <NUM>, so that the second antenna element <NUM> operates on the operating frequency band of the first antenna element <NUM>.

It should be understood that the one or more connection points of the first antenna radiator <NUM> may be used to indicate a connection position at which the first antenna radiator <NUM> is electrically connected to another element. Similarly, the one or more connection points of the second antenna radiator <NUM> may be used to indicate a connection position at which the second antenna radiator <NUM> is electrically connected to another element.

In addition to the case shown in <FIG>, for an element layout, a circuit connection manner, and the like of the foldable terminal device <NUM>, the foldable terminal device <NUM> provided in this application may have another possible implementation.

Optionally, the foldable terminal device <NUM> further includes a second feed source <NUM>. The first antenna element <NUM> is fed by the first feed source <NUM> and the second feed source <NUM>. The first antenna element <NUM> includes the first antenna radiator <NUM>. The first antenna radiator <NUM> includes the first connection point <NUM> and the second connection point <NUM>. The first connection point <NUM> of the first antenna radiator <NUM> is electrically connected to the second feed source <NUM>, and the second connection point <NUM> of the second antenna radiator <NUM> is electrically connected to the first feed source <NUM>. The second antenna element <NUM> includes the second antenna radiator <NUM> and a first tuning element, and the second antenna radiator <NUM> is configured to couple to the first antenna radiator <NUM> for coupled feeding. The second antenna radiator <NUM> includes the third connection point <NUM> and the fourth connection point <NUM>. Both the third connection point <NUM> of the second antenna radiator <NUM> and the fourth connection point <NUM> of the second antenna radiator <NUM> are grounded. The first tuning element is electrically connected between a ground and the third connection point <NUM> of the second antenna radiator <NUM>, and is configured to adjust the operating frequency band of the second antenna element <NUM> to include the operating frequency band of the first antenna element <NUM>.

As shown in <FIG>, the foldable terminal device <NUM> further includes the second feed source <NUM>. The first antenna element <NUM> is fed by the first feed source <NUM> and the second feed source <NUM>. The first antenna element <NUM> includes the first antenna radiator <NUM> configured to receive or send a signal. The first antenna radiator <NUM> includes one or more connection points. The first connection point <NUM> of the first antenna radiator <NUM> is electrically connected to the second feed source <NUM>, and the second connection point <NUM> of the first antenna radiator <NUM> is electrically connected to the first feed source <NUM>, where the first feed source <NUM> and the second feed source <NUM> are two feed sources providing differential signals for the first antenna radiator together, so that the first feed source <NUM> and the second feed source <NUM> feed the first antenna element <NUM>. Therefore, an area of the first antenna radiator <NUM> from the first connection point <NUM> to the second connection point <NUM> can operate in an operating frequency band. The second antenna element <NUM> of the foldable terminal device <NUM> includes the second antenna radiator <NUM> configured to receive or send a signal. The second antenna radiator <NUM> includes one or more connection points. The third connection point <NUM> of the second antenna radiator <NUM> is grounded, the fourth connection point <NUM> of the second antenna radiator <NUM> is electrically connected to one end of a tuning element, and the other end of the tuning element is grounded. When the foldable terminal device <NUM> is folded, the second antenna radiator <NUM> is coupled to the first antenna radiator <NUM> for coupled feeding. Therefore, an area of the second antenna radiator <NUM> from the third connection point <NUM> to the fourth connection point <NUM> can operate in the operating frequency band of the first antenna radiator <NUM>, so that the second antenna element <NUM> operates on the operating frequency band of the first antenna element <NUM>.

It should be understood that, to improve coupling feeding efficiency between the first antenna radiator <NUM> and the second antenna radiator <NUM>, when the foldable terminal device <NUM> is folded, distances from most point positions of the area of the first antenna radiator <NUM> from the first connection point <NUM> to the second connection point <NUM> to the area of the second antenna radiator <NUM> from the third connection point <NUM> to the fourth connection point <NUM> should be as close as possible. Correspondingly, distances from most point positions of the area of the second antenna radiator <NUM> from the third connection point <NUM> to the fourth connection point <NUM> to the area of the first antenna radiator <NUM> from the first connection point <NUM> to the second connection point <NUM> should be as close as possible.

Optionally, when the foldable terminal device <NUM> is folded, a distance between the first connection point <NUM> of the first antenna radiator <NUM> and the third connection point <NUM> of the second antenna radiator <NUM> is less than a first preset threshold, and a distance between the second connection point <NUM> of the first antenna radiator <NUM> and the fourth connection point <NUM> of the second antenna radiator <NUM> is less than a second preset threshold; or a distance between the first connection point <NUM> of the first antenna radiator <NUM> and the fourth connection point <NUM> of the second antenna radiator <NUM> is less than the first preset threshold, and a distance between the second connection point <NUM> of the first antenna radiator <NUM> and the third connection point <NUM> of the second antenna radiator <NUM> is less than the second preset threshold.

It should be understood that both the first preset threshold and the second preset threshold may be preset based on a specific situation. This is not limited in this embodiment of this application.

The first antenna radiator <NUM> and the second antenna radiator <NUM> are disposed in parallel or approximately parallel on the foldable terminal device <NUM>. The foldable terminal device <NUM> is viewed from a side surface of the foldable terminal device <NUM> and from an angle at which a longest side of the first antenna radiator <NUM> or the second antenna radiator <NUM> can be observed, as shown in <FIG> shows a case in which a distance between the first connection point <NUM> of the first antenna radiator <NUM> and the third connection point <NUM> of the second antenna radiator <NUM> is less than a first preset threshold, and a distance between the second connection point <NUM> of the first antenna radiator <NUM> and the fourth connection point <NUM> of the second antenna radiator <NUM> is less than a second preset threshold. The first connection point <NUM> of the first antenna radiator <NUM> is correspondingly disposed right above the third connection point <NUM> of the second antenna radiator <NUM>, and the second connection point <NUM> of the first antenna radiator <NUM> is correspondingly disposed right above the fourth connection point <NUM> of the second antenna radiator <NUM>. In this case, a projection area of the area of the first antenna radiator <NUM> from the first connection point <NUM> to the second connection point <NUM> on the second antenna radiator <NUM> coincides with the area of the second antenna radiator <NUM> from the third connection point <NUM> to the fourth connection point <NUM>. In other words, the first connection point <NUM> of the first antenna radiator <NUM> is aligned with the third connection point <NUM> of the second antenna radiator <NUM>, and the second connection point <NUM> of the first antenna radiator <NUM> is aligned with the fourth connection point <NUM> of the second antenna radiator <NUM>.

<FIG> shows a case in which a distance between the first connection point <NUM> of the first antenna radiator <NUM> and the fourth connection point <NUM> of the second antenna radiator <NUM> is less than a first preset threshold, and a distance between the second connection point <NUM> of the first antenna radiator <NUM> and the third connection point <NUM> of the second antenna radiator <NUM> is less than a second preset threshold. The first connection point <NUM> of the first antenna radiator <NUM> is correspondingly disposed right above the fourth connection point <NUM> of the second antenna radiator <NUM>, and the second connection point <NUM> of the first antenna radiator <NUM> is correspondingly disposed right above the third connection point <NUM> of the second antenna radiator <NUM>. In this case, a projection area of the area of the first antenna radiator <NUM> from the first connection point <NUM> to the second connection point <NUM> on the second antenna radiator <NUM> coincides with an area of the second antenna radiator <NUM> from the fourth connection point <NUM> to the third connection point <NUM>. In other words, the first connection point <NUM> of the first antenna radiator <NUM> is aligned with the fourth connection point <NUM> of the second antenna radiator <NUM>, and the second connection point <NUM> of the first antenna radiator <NUM> is aligned with the third connection point <NUM> of the second antenna radiator <NUM>.

Optionally, the first antenna element <NUM> is fed by the first feed source <NUM> and operates on a first frequency band. The foldable terminal device <NUM> further includes: a third feed source <NUM>, where the first antenna element <NUM> is fed by the third feed source <NUM> and operates on a second frequency band; a first filtering element, electrically connected between the first feed source <NUM> and the first antenna element <NUM>, and configured to filter a signal of the second frequency band; and a second filtering element, electrically connected between the third feed source <NUM> and the first antenna element <NUM>, and configured to filter a signal of the first frequency band.

The first antenna element <NUM> can multiplex a plurality of antennas, so as to operate in a plurality of frequency bands.

As shown in <FIG>, the first feed source <NUM> provides a feed for the first antenna element <NUM>, so that the first antenna element <NUM> can operate in the first frequency band. The first antenna element <NUM> further includes a fifth connection point <NUM>, and the foldable terminal device <NUM> further includes the third feed source <NUM> electrically connected to the fifth connection point <NUM> of the first antenna element <NUM>. The third feed source <NUM> provides a feed for the first antenna element <NUM>, so that the first antenna element <NUM> can operate in the second frequency band. An area of the first antenna element <NUM> from the first connection point <NUM> to the second connection point <NUM> may be configured to radiate a signal of the first frequency band, and an area of the first antenna element <NUM> from the first connection point <NUM> to the fifth connection point <NUM> may be configured to radiate a signal of the second frequency band. To avoid interference generated between different frequency bands, the first filtering element is connected in series on a connection path on which the second connection point <NUM> of the first antenna element <NUM> is electrically connected to the first feed source <NUM>, and the first filtering element is configured to filter the signal of the second frequency band; and the second filtering element is connected in series on a connection path on which the fifth connection point <NUM> of the first antenna element <NUM> is electrically connected to the third feed source <NUM>, and the second filtering element is configured to filter the signal of the first frequency band.

It should be understood that the filtering element in this application may be an element such as a capacitor or an inductor, or may be a filtering apparatus configured with a plurality of elements.

Still using <FIG> as an example, if the first frequency band is a low frequency band, for example, may be <NUM> to <NUM>, and the second frequency band is a high frequency band, for example, may be more than <NUM>, the first filtering element may be an inductor, and the second filtering element may be a capacitor.

When the foldable terminal device <NUM> is folded, the second antenna element <NUM> may be coupled to the first antenna element <NUM> for coupled feeding, and operates on the first frequency band or the second frequency band.

Optionally, the foldable terminal device <NUM> further includes: a second tuning element <NUM>, electrically connected to the first antenna element <NUM>, and configured to adjust the second frequency band.

As shown in <FIG>, the second tuning element <NUM> is electrically connected to the first antenna element <NUM>, and is configured to adjust the second frequency band. For example, the second frequency band may be adjusted from the high frequency band to a medium-high frequency band.

Optionally, the second antenna element <NUM> is coupled to and fed by the first antenna element <NUM> and operates on a third frequency band. The foldable terminal device <NUM> further includes: a fourth feed source <NUM>, a third filtering element, and a fourth filtering element. The second antenna element <NUM> is fed by the fourth feed source <NUM> and operates on a fourth frequency band. The third filtering element is electrically connected between a ground and the second antenna element <NUM>, and is configured to filter a signal of the fourth frequency band. The fourth filtering element is electrically connected between the fourth feed source <NUM> and the second antenna element <NUM>, and is configured to filter a signal of the third frequency band.

As shown in <FIG>, the first antenna element <NUM> provides a feed for the second antenna element <NUM>, so that the second antenna element <NUM> can operate in the third frequency band. The second antenna element <NUM> further includes a sixth connection point <NUM>, and the foldable connection device further includes the fourth feed source <NUM> electrically connected to the sixth connection point <NUM> of the second antenna element <NUM>. The fourth feed source <NUM> provides a feed for the second antenna element <NUM>, so that the second antenna element <NUM> can operate in the fourth frequency band. An area of the second antenna element <NUM> from the third connection point <NUM> to the fourth connection point <NUM> may be configured to radiate a signal of the third frequency band, and an area of the second antenna element <NUM> from the third connection point <NUM> to the sixth connection point <NUM> may be configured to radiate a signal of the fourth frequency band. To avoid interference generated between different frequency bands, the third filtering element is connected in series on a connection path on which the fourth connection point <NUM> of the second antenna element <NUM> is electrically connected to a ground, and the third filtering element is configured to filter the signal of the fourth frequency band; and the fourth filtering element is connected in series on a connection path on which the sixth connection point <NUM> of the second antenna element <NUM> is electrically connected to the third feed source <NUM>, and the fourth filtering element is configured to filter the signal of the third frequency band.

<FIG> is used as an example, if the third frequency band is a low frequency band, for example, may be <NUM> to <NUM>, and the fourth frequency band is a high frequency band, for example, may be more than <NUM>, the third filtering element may be an inductor, and the fourth filtering element may be a capacitor.

Because a first tuning element <NUM> is connected in series between the fourth connection point <NUM> of the second antenna element <NUM> and the ground, in some cases, the first tuning element may be configured to not only tune an operating frequency band of the second antenna element to include an operating frequency band of the first antenna element, but also filter the fourth frequency band. The first tuning element <NUM> shown in <FIG> may be the third filtering element.

When the foldable terminal device <NUM> is folded, the second antenna element <NUM> can operate in the operating frequency band of the first antenna element <NUM> and the fourth frequency band.

Optionally, the foldable terminal device <NUM> further includes: a third tuning element <NUM>, electrically connected to the second antenna element <NUM>, and configured to adjust the fourth frequency band.

As shown in <FIG>, the third tuning element <NUM> is electrically connected to the second antenna element <NUM>, and is configured to adjust the fourth frequency band. For example, the fourth frequency band may be adjusted from the high frequency band to a medium-high frequency band.

<FIG> is a foldable terminal device <NUM> according to this application. The first feed source <NUM> provides a feed for the first antenna element <NUM>, so that the first antenna element <NUM> can operate in the first frequency band. The first antenna element <NUM> further includes a fifth connection point <NUM>, and the foldable terminal device <NUM> further includes the third feed source <NUM> electrically connected to the fifth connection point <NUM> of the first antenna element <NUM>. The third feed source <NUM> provides a feed for the first antenna element <NUM>, so that the first antenna element <NUM> can operate in the second frequency band. An area of the first antenna element <NUM> from the first connection point <NUM> to the second connection point <NUM> may be configured to radiate a signal of the first frequency band, and an area of the first antenna element <NUM> from the first connection point <NUM> to the fifth connection point <NUM> may be configured to radiate a signal of the second frequency band. To avoid interference generated between different frequency bands, the first filtering element is connected in series on a connection path on which the second connection point <NUM> of the first antenna element <NUM> is electrically connected to the first feed source <NUM>, and the first filtering element is configured to filter the signal of the second frequency band; and the second filtering element is connected in series on a connection path on which the fifth connection point <NUM> of the first antenna element <NUM> is electrically connected to the third feed source <NUM>, and the second filtering element is configured to filter the signal of the first frequency band. The first antenna element <NUM> provides a feed for the second antenna element <NUM>, so that the second antenna element <NUM> can operate in the third frequency band. The second antenna element <NUM> further includes a sixth connection point <NUM>, and the foldable terminal device further includes the fourth feed source <NUM> electrically connected to the sixth connection point <NUM> of the second antenna element <NUM>. The fourth feed source <NUM> provides a feed for the second antenna element <NUM>, so that the second antenna element <NUM> can operate in the fourth frequency band. An area of the second antenna element <NUM> from the third connection point <NUM> to the fourth connection point <NUM> may be configured to radiate a signal of the third frequency band, and an area of the second antenna element <NUM> from the third connection point <NUM> to the sixth connection point <NUM> may be configured to radiate a signal of the fourth frequency band. To avoid interference generated between different frequency bands, the third filtering element is connected in series on a connection path on which the fourth connection point <NUM> of the second antenna element <NUM> is electrically connected to a ground, and the third filtering element is configured to filter the signal of the fourth frequency band; and the fourth filtering element is connected in series on a connection path on which the sixth connection point <NUM> of the second antenna element <NUM> is electrically connected to the third feed source <NUM>, and the fourth filtering element is configured to filter the signal of the third frequency band.

In addition, the displayed or discussed mutual couplings or direct couplings or communication connections may be implemented through some interfaces.

When the functions are implemented in the form of a software function unit and sold or used as an independent product, the functions may be stored in a computer-readable storage medium. Based on such an understanding, the technical solutions of this application essentially, or the part contributing to the prior art, or some of the technical solutions may be implemented in a form of a software product. The computer software product is stored in a storage medium, and includes several instructions for instructing a computer device (which may be a personal computer, a server, or a network device) to perform all or some of the steps of the methods described in the embodiments of this application. The foregoing storage medium includes: any medium that can store program code, such as a USB flash drive, a removable hard disk, a read-only memory (read-only memory, ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disc.

Claim 1:
A foldable terminal device (<NUM>), comprising:
a first feed source (<NUM>); and
a first part (<NUM>) and a second part (<NUM>) that are foldable with respect to each other; ; wherein
the first part (<NUM>) is configured with:
a first antenna element (<NUM>), fed by the first feed source (<NUM>), and configured to operate in a first frequency band; and
the second part (<NUM>) is configured with:
a second antenna element (<NUM>), coupled to the first antenna element (<NUM>) for coupled feeding when the foldable terminal device (<NUM>) is folded,
wherein when the foldable terminal device (<NUM>) is folded, the second antenna element (<NUM>) is configured to operate in the first frequency band, and
characterized in that the foldable terminal device (<NUM>) further comprises:
a third feed source (<NUM>), wherein the first antenna element (<NUM>) is fed by the third feed source (<NUM>) and configured to operate on a second frequency band;
a first filtering element, electrically connected between the first feed source (<NUM>) and the first antenna element (<NUM>), and configured to filter a signal of the second frequency band; and
a second filtering element, electrically connected between the third feed source (<NUM>) and the first antenna element (<NUM>), and configured to filter a signal of the first frequency band.