Foldable device

Abstract

The embodiment of the invention relates to foldable equipment. The foldable equipment comprises a foldable main body and an antenna assembly, the foldable main body comprises a first main body and a second main body, and the first main body and the second main body are movably connected to present a folded state or an unfolded state; the antenna assembly comprises a main branch arranged on the first main body, and a first parasitic branch and a second parasitic branch which are arranged on the second main body; the main branch knot is provided with a feeding point used for being connected with a feed source, the main branch knot is used for generating excitation current under excitation of a feed signal provided by the feed source, and the first main body and the second main body are in a folded state and the main branch knot has the excitation current supporting a first frequency band. The first parasitic branch is used for being coupled with the main branch to generate a first parasitic current used for supporting a second frequency band, and the second parasitic branch is used for being coupled with the first parasitic branch to generate a second parasitic current used for supporting a third frequency band; wherein the second frequency band is not lower than the first frequency band.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technologies, and particularly to a foldable device. Background Art

[0002] Electronic devices with unfolded and folded states have received increasing widespread attention because they have a large display screen when unfolded, occupy a small space when folded, and are convenient to carry. However, the communication performance of foldable devices still cannot meet the usage requirements of users. How to provide a foldable device with better communication performance has become an urgent problem to be solved. Summary of the Invention

[0003] Based on this, it is necessary to provide a foldable device for the above technical problems.

[0004] The present application provides a foldable device, including a foldable main body and an antenna assembly;

[0005] The foldable main body includes a first main body and a second main body, and the first main body is movably connected to the second main body to present a folded state or an unfolded state;

[0006] The antenna assembly includes a main stub provided on the first main body, and a first parasitic stub and a second parasitic stub provided on the second main body; the main stub has a feeding point for connecting a feeder, and the main stub is configured to generate an exciting current under the excitation of the feeding signal provided by the feeder. When the first main body and the second main body present a folded state and the main stub has an exciting current supporting a first frequency band, the first parasitic stub is configured to be coupled with the main stub to generate a first parasitic current for supporting a second frequency band, and the second parasitic stub is configured to be coupled with the first parasitic stub to generate a second parasitic current for supporting a third frequency band;

[0007] Wherein, the second frequency band is not lower than the first frequency band.

[0008] The above-mentioned foldable device, by providing a foldable body including a first body and a second body, enables the foldable device to flexibly switch between a folded state and an unfolded state. Among them, the length of the foldable device in the folded state is small, which is convenient for users to store the foldable device. The unfolded state can expand the display area of the foldable device, which is convenient for viewing the screen displayed by the foldable device and improving the viewing experience. By coupling the main branch and the first parasitic branch in the folded state, the foldable device can be controlled to work in the first frequency band and the second frequency band at the same time. When the frequency bands supported by multiple radiating branches are the same, the coupled first parasitic branch can adjust the directional pattern of the foldable device in the frequency band to improve the radiation efficiency of the foldable device. In particular, if the center frequency points of the main branch and the first parasitic branch are different, the bandwidth of the foldable device in the frequency band can also be expanded. When the frequency bands supported by multiple radiating branches are different, the foldable device can support more working frequency bands. In addition, by coupling the second parasitic branch and the first parasitic branch, the foldable device can be controlled to work in the third frequency band at the same time, thereby further improving the communication flexibility of the foldable device. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 is an exploded schematic diagram of a foldable device according to an embodiment;

[0011] Figure 2 This is one of the structural schematic diagrams of a foldable device in an unfolded state according to an embodiment;

[0012] Figure 3 One of the schematic diagrams of the structure of a plurality of radiating branches in a folded state according to an embodiment;

[0013] Figure 4 The second structural schematic diagram of a plurality of radiating branches in a folded state according to an embodiment;

[0014] Figure 5 The third structural schematic diagram of a plurality of radiating branches in a folded state according to an embodiment;

[0015] Figure 6 The fourth structural schematic diagram of a plurality of radiating branches in a folded state according to an embodiment;

[0016] Figure 7 For an embodiment Figure 3 Examples andFigure 5 Radiation efficiency diagram of the antenna assembly of the embodiment;

[0017] Figure 8 For an embodiment Figure 4 embodiment and Figure 6 Radiation efficiency diagram of the antenna assembly of the embodiment;

[0018] Figure 9 The second structural schematic diagram of the foldable device in the unfolded state for an embodiment.

[0019] Description of component labels:

[0020] Display screen: 10; Middle frame: 20; Frame body: 21; Frame edge: 22; Main board: 24; Rear cover: 30; First main body: 110; First side: 111; Second main body: 120; Second side: 121; Third side: 122; Rotating shaft: 130; Main branch: 210; First parasitic branch: 220; Second parasitic branch: 230. Detailed implementation manners

[0021] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] It can be understood that the terms "first", "second", etc. used in the present application may be used herein to describe various components, but these components are not limited by these terms. These terms are only used to distinguish the first component from another component. For example, without departing from the scope of the present application, the first parasitic branch may be referred to as the second parasitic branch, and similarly, the second parasitic branch may be referred to as the first parasitic branch.

[0023] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. The meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0024] The embodiments of the present application provide a foldable device. It should be noted that the foldable device in the embodiments of the present application is a foldable device in a broad sense, and any electronic device capable of realizing morphological changes based on the flexible display screen 10 technology belongs to the protection scope of the foldable device in the embodiments of the present application. For example, the foldable device can be realized based on flexible display screen technologies such as foldable screens and rollable screens. The foldable device includes, but is not limited to, electronic devices such as mobile phones, tablet computers, and laptop computers.

[0025] Figure 1 FIG. is an exploded schematic view of a foldable device according to an embodiment. Referring to Figure 1 , the foldable device includes a display screen 10, a middle frame 20, and a rear cover 30 sequentially arranged in the thickness direction. The middle frame 20 and the rear cover 30 of the foldable device may include multiple parts to support the folding function of the foldable device.

[0026] Among them, the middle frame 20 includes a frame body 21 and a side frame 22 surrounding the periphery of the frame body 21. The side frame 22 may be a conductive side frame 22. The display screen 10, the frame body 21, and the rear cover 30 are sequentially stacked, and accommodation spaces are formed between the display screen 10 and the frame body 21, and between the frame body 21 and the rear cover 30 to accommodate components such as a main board 24, a camera module, a receiver module, a battery, and various sensors. One side of the side frame 22 surrounds the edge of the display screen 10, and the other side of the side frame 22 surrounds the edge of the rear cover 30 to form a complete appearance structure of the foldable device. In this embodiment, the side frame 22 and the frame body 21 are an integral structure, and the side frame 22 and the rear cover 30 may be a split structure. The above is the working environment of the antenna assembly taking a mobile phone as an example, but the antenna assembly of the present application is not limited to the above working environment.

[0027] The side frame 22 includes a top side and a bottom side arranged opposite to each other, and a first side and a second side connecting the top side and the bottom side. Among them, the top side is the side away from the ground when the user holds the foldable device vertically, and the bottom side is the side facing the ground when the user holds the foldable device vertically. The first side is the left side when the user holds the foldable device vertically. The second side is the right side when the user holds the foldable device vertically. Of course, the first side may also be the right side when the user holds the foldable device, and the second side is the left side when the user holds the foldable device.

[0028] The foldable device further includes a reference floor 23. Optionally, the reference floor 23 is disposed within the frame 22. That is, the frame 22 surrounds the periphery of the reference floor 23. The shape of the reference floor 23 is generally rectangular. Because components are arranged as needed or other structures are avoided in the mobile phone, various slots, holes, etc. can be formed on the reference floor 23. The reference floor 23 can be, but is not limited to, the frame body 21 of the middle frame 20 in the foldable device, or the ground in the circuit board, or the shielding member of the display screen 10, or the conductive battery cover, etc. In other embodiments, the reference floor 23 can also be a separate ground independent of the frame body 21 of the foldable device, the ground of the circuit board, the shielding member of the display screen 10, and the conductive battery cover. The present application does not limit the reference floor 23.

[0029] Figure 2 FIG. 4 is one of the schematic structural diagrams of the foldable device in the unfolded state of an embodiment. Refer to Figure 2 , the foldable device includes a foldable main body and an antenna assembly.

[0030] Among them, the foldable main body includes a first main body 110 and a second main body 120, and the first main body 110 and the second main body 120 are movably connected to present a folded state or an unfolded state. It should be noted that in this embodiment, the foldable main body including the first main body 110 and the second main body 120 is taken as an example for illustration, and the sizes and shapes of the first main body 110 and the second main body 120 are the same. However, in some embodiments, the foldable main body may include three or more main bodies, and the sizes and shapes of different main bodies may not be exactly the same. This embodiment does not make a limitation.

[0031] The antenna assembly includes a plurality of radiation branches. The plurality of radiation branches specifically include a main branch 210 disposed on the first main body 110 and a first parasitic branch 220 disposed on the second main body 120.

[0032] The radiation branch is a conductor with specific dimensions. The material of the radiation branch includes but is not limited to metal, alloy, graphite, semiconductor, plasma, and conductive polymer. The shape of the radiation branch includes but is not limited to strip, sheet, rod, coating, and film. The extension mode of the radiation branch includes but is not limited to linear extension, curved extension, and bent extension. The above-mentioned main branch 210 can be a line with a uniform width on the extension trajectory, or an irregular shape with a gradually changing width, a widened area, etc. and unequal widths. In the schematic diagram of this embodiment, taking the extension of each radiation branch along a straight trajectory as an example, it can be understood that the schematic diagram shown in this embodiment should not be construed as a limitation on the radiation branch provided by the embodiment of the present application.

[0033] The radiation stub can be an internal antenna or an external antenna. When the radiation stub is an internal antenna, the form of the radiation stub includes but is not limited to a flexible circuit board antenna formed on a flexible printed circuit board (FPC), a laser direct structuring (LDS) antenna formed by laser direct structuring, a print direct structuring (PDS) antenna formed by print direct structuring, and a conductive sheet antenna (such as a metal bracket antenna). When the radiation stub is an external antenna, the form of the radiation stub includes but is not limited to a frame antenna and an antenna provided on the outer surface of a non-conductive frame.

[0034] The main stub 210 has a feeding point for connecting to a feeder. The main stub 210 is configured to generate an excitation current under the excitation of the feeding signal provided by the feeder. The "feeding point" can be understood as the end, or port, or position where the stub is electrically connected to the corresponding feeder. Similar naming in the following embodiments has similar meanings and will not be elaborated further. The feeder and the feeding point can be directly welded or electrically connected through electrical connectors such as coaxial cables, microstrip lines, conductive elastomers, conductive adhesives, and circuit boards.

[0035] The feeding signal is at least used to excite an excitation current for supporting a first frequency band on the main stub 210. Exemplarily, the feeder can excite all of the main stub 210 to generate an excitation current for supporting the first frequency band, that is, the excitation current is mainly distributed throughout the main stub 210. Another exemplarily, the feeder can excite a part of the main stub 210 to generate an excitation current for supporting the first frequency band, that is, the excitation current is mainly distributed on a part of the main stub 210. It should be noted that an excitation signal for supporting other frequency bands can also be generated on the main stub 210. Specifically, the main stub 210 can generate an excitation current for supporting other frequency bands under the excitation of other excitation signals provided by other feeders, or by adjusting the tuning circuit connected to the main stub 210, the main stub 210 can generate an excitation current for supporting other frequency bands under the excitation of other excitation signals provided by the same feeder.

[0036] Figure 3 As one of the schematic structural diagrams of multiple radiation stubs in the folded state of an embodiment, when the first body 110 and the second body 120 are in the folded state and there is an excitation current for supporting the first frequency band on the main stub 210, the first parasitic stub 220 is configured to couple with the main stub 210 to generate a first parasitic current for supporting a second frequency band. The second frequency band is not lower than the first frequency band to enhance resonance.

[0037] Among them, "coupling" means that an electric field is generated between the main branch 210 and the first parasitic branch 220, and the electrical signal on the main branch 210 can be transmitted to the first parasitic branch 220 through the electric field, so that the main branch 210 and the first parasitic branch 220 can achieve electrical signal conduction even when they are not in direct contact or direct connection. Specifically, the main branch 210 can have the same extension direction as the first parasitic branch 220 and be relatively arranged in a direction perpendicular to the extension direction, so that there is a relatively large relative area between the main branch 210 and the first parasitic branch 220, ensuring the coupling effect between the main branch 210 and the first parasitic branch 220, thereby enhancing the intensity of the first parasitic current on the first parasitic branch 220 and enabling the first parasitic branch 220 to have better signal radiation ability in the second frequency band.

[0038] Exemplarily, the first frequency band and the second frequency band are the same. When the frequency bands supported by multiple radiation branches are the same, the coupled first parasitic branch 220 can adjust the radiation pattern of the foldable device in this frequency band and improve the radiation efficiency of the foldable device. Especially if the center frequency points of the main branch 210 and the first parasitic branch 220 are different, the bandwidth of the foldable device in this frequency band can also be expanded.

[0039] The first frequency band and the second frequency band can be any one of the low-frequency band, the medium-frequency band, the high-frequency band, and the ultra-high-frequency band. The low-frequency band is the frequency band located at 704 MHz to 960 MHz. The low-frequency band includes but is not limited to the B5 / N5 band (uplink 824 MHz to 849 MHz; downlink 869 MHz to 894 MHz), the B8 / N8 band (uplink 880 MHz to 915 MHz; downlink 925 MHz to 960 MHz), the B20 / N20 band (uplink 832 MHz to 862 MHz; downlink 791 MHz to 821 MHz), and the B28 band (uplink 703 MHz to 748 MHz; downlink 758 MHz to 803 MHz). The medium-frequency band is the frequency band located at 1710 MHz to 2170 MHz. The medium-frequency band includes but is not limited to the B1 / N1 band (uplink 1920 MHz to 1980 MHz; downlink 2110 MHz to 2170 MHz), the B2 / N2 band (uplink 1850 MHz to 1910 MHz; downlink 1930 MHz to 1990 MHz), the B3 / N3 band (uplink 1710 MHz to 1785 MHz; downlink 1805 MHz to 1880 MHz), the B4 band (uplink 1710 MHz to 1755 MHz; downlink 2110 MHz to 2155 MHz), the B34 / N34 band (2010 MHz to 2025 MHz), and the B39 / N39 band (1880 MHz to 1920 MHz). The high-frequency band is the frequency band located at 2 MHz to 2690 MHz. The high-frequency band includes but is not limited to the B40 / N40 band (2 MHz to 2 MHz), the B41 / N41 band (2469 MHz to 2690 MHz), the B38 / N38 band (2570 MHz to 2620 MHz), and the B7 / N7 band (uplink 2 MHz to 2570 MHz; downlink 2620 MHz to 2690 MHz). The ultra-high-frequency band is the frequency band greater than 2690 MHz. The ultra-high-frequency band includes but is not limited to the N77 band (3.3 GHz to 4.2 GHz), the N78 band (3.3 GHz to 3.8 GHz), and the N79 band (4.4 GHz to 5.0 GHz). Of course, the ultra-high-frequency band also includes but is not limited to the frequency band greater than 5 GHz.

[0040] Another example is that the second frequency band is higher than the first frequency band. When the second frequency band is different from the first frequency band, the foldable device can support more operating frequency bands, thereby improving the communication flexibility of the foldable device. Optionally, the second frequency band and the first frequency band can belong to any one of the low-frequency band, the medium-frequency band, the high-frequency band, and the ultra-high-frequency band, or the second frequency band can be the ultra-high-frequency band and the first frequency band can be the high-frequency band, or the second frequency band can be the high-frequency band and the first frequency band can be the medium-frequency band, or the second frequency band can be the medium-frequency band and the first frequency band can be the low-frequency band.

[0041] Continue to refer to Figure 2 and Figure 3 The multiple radiation branches of the antenna assembly further include a second parasitic branch 230 provided on the second body 120. In order to improve the loss on the trace, especially the loss of high-frequency signals on the trace, the main branch 210 can be arranged close to the feed source to shorten the trace length between the main branch 210 and the feed source. Correspondingly, the feed source and the main branch 210 can be arranged on the same body of the foldable device, that is, both the feed source and the main branch 210 are arranged on the first body 110 of the foldable device in the embodiment of the present application. For similar reasons, in order to shorten the trace length between the feed source and other radiation branches connected thereto, other radiation branches can also be arranged on the first body 110. However, the above arrangement will make the setting space of the radiation branches on the first body 110 relatively tight. Therefore, in this embodiment, the second parasitic branch 230 is arranged on the second body 120, and the second parasitic branch 230 does not occupy the space of the first body 110 to ensure that the first body 110 has enough space to accommodate other radiation branches connected to the feed source.

[0042] The second parasitic branch 230 is used to couple with the first parasitic branch 220 to generate a second parasitic current for supporting the third frequency band. Among them, "coupling" means that an electric field is generated between the first parasitic branch 220 and the second parasitic branch 230, and the electrical signal on the first parasitic branch 220 can be transmitted to the second parasitic branch 230 through the electric field, so that the first parasitic branch 220 and the second parasitic branch 230 can achieve electrical signal conduction even in a state of not being in direct contact or not being directly connected.

[0043] Among them, by adjusting the electrical length of the second parasitic branch 230, the adjustment of the third frequency band supported by the second parasitic branch 230 can be realized. The second frequency band supported by the first parasitic branch 220 and the third frequency band supported by the second parasitic branch 230 can be the same or different, and this embodiment does not make a limitation. Exemplarily, the second frequency band and the third frequency band are the same. When the second frequency band and the third frequency band are the same, the coupled second parasitic branch 230 can adjust the radiation pattern of the foldable device in this frequency band and improve the radiation efficiency of the foldable device. Especially if the center frequency points of the second parasitic branch 230 and the first parasitic branch 220 are different, the bandwidth of the foldable device in this frequency band can also be expanded. The second frequency band and the third frequency band can be any one of the low-frequency band, the medium-frequency band, the high-frequency band, and the ultra-high-frequency band. Another exemplarily, the second frequency band and the third frequency band are different. When the second frequency band and the third frequency band are different, the foldable device can support more working frequency bands, thereby improving the communication flexibility of the foldable device.

[0044] In the embodiments of the application, by providing a foldable body including a first body 110 and a second body 120, the foldable device can be flexibly switched between a folded state and an unfolded state. Among them, the length of the foldable device in the folded state is smaller, which is convenient for the user to store the foldable device. In the unfolded state, the display area of the foldable device can be expanded, which is convenient for viewing the picture displayed on the foldable device and improving the viewing experience. By coupling the main branch 210 and the first parasitic branch 220 in the folded state, the foldable device can be controlled to operate in the first frequency band and the second frequency band simultaneously. When the frequency bands supported by multiple radiation branches are the same, the coupled first parasitic branch 220 can adjust the radiation pattern of the foldable device in this frequency band, improving the radiation efficiency of the foldable device. In particular, if the center frequencies corresponding to multiple radiation branches supporting the same frequency band are different, the bandwidth of the foldable device in this frequency band can also be expanded. When the frequency bands supported by multiple radiation branches are different, the foldable device can support more operating frequency bands. In addition, by coupling the second parasitic branch 230 and the first parasitic branch 220, the foldable device can be controlled to operate in the third frequency band simultaneously, thereby further improving the communication flexibility of the foldable device.

[0045] Figure 4 FIG. 4B is a second schematic structural diagram of multiple radiation branches in the folded state of an embodiment, with reference to Figure 3 and Figure 4 , in one embodiment, the first parasitic branch 220 has a first free end A1 and a first ground end B1, and the second parasitic branch 230 has a second free end A2 and a second ground end B2. Among them, the "free end" can be understood as the end of the branch that is not electrically connected to other conductive parts, or there is a slit between it and the conductive part, or it is isolated from the conductive part by an insulating material. The "ground end" can be understood as the end, port, or position where the branch is electrically connected to the reference ground. Similar names in the following embodiments have similar meanings and will not be elaborated later.

[0046] As Figure 3 shown, the second ground end B2 of the second parasitic branch 230 is close to the first free end A1 of the first parasitic branch 220. As Figure 4As shown, the second free end A2 of the second parasitic stub 230 is close to the first grounded end B1 of the first parasitic stub 220. The above two setting methods can be understood as that the opening directions of the first parasitic stub 220 and the second parasitic stub 230 are the same. When the opening directions of the first parasitic stub 220 and the second parasitic stub 230 are the same, the directions of the current distributions on the second parasitic stub 230 and the first parasitic stub 220 are consistent, so the coupling effect is stronger. Based on this, the stronger coupling effect makes the second parasitic stub 230 more affected by the first parasitic stub 220, so that the third frequency band supported by the second parasitic stub 230 is limited by the first parasitic stub 220, and thus the third frequency band is lower than the second frequency band.

[0047] Exemplarily, the second frequency band is the N78 frequency band, and the third frequency band is the B41 frequency band. It can be understood that due to the hardware design of traditional electronic devices, it is often impossible to support the communication services of multiple operators at the same time. Therefore, the foldable device of the embodiment of the present application is compatible with the N78 frequency band and the B41 frequency band. Since N78 is the working frequency band of China Unicom and China Telecom, and B41 is the working frequency band of China Mobile, the foldable device can perform the communication services of China Unicom or China Telecom through the N78 frequency band of the first parasitic antenna, and at the same time support the communication services of China Mobile through the B41 frequency band of the second parasitic antenna, thereby improving the user's communication experience.

[0048] Figure 5 It is the third structural schematic diagram of the multiple radiation stubs in the folded state of an embodiment. Figure 6 It is the fourth structural schematic diagram of the multiple radiation stubs in the folded state of an embodiment. With reference to Figure 5 and Figure 6 , in one embodiment, the first parasitic stub 220 has a first free end A1 and a first grounded end B1, and the second parasitic stub 230 has a second free end A2 and a second grounded end B2. Among them, the "free end" can be understood as the end of the stub that is not electrically connected to other conductive parts, or there is a slit between it and the conductive part, or it is isolated from the conductive part by an insulating material. The "grounded end" can be understood as the end, port, or position where the stub is electrically connected to the reference ground. Similar names in the following embodiments have similar meanings and will not be elaborated later.

[0049] As Figure 5 shown, the second free end A2 of the second parasitic stub 230 is close to the first free end A1 of the first parasitic stub 220. As Figure 6As shown, the second grounding end B2 of the second parasitic stub 230 is close to the first grounding end B1 of the first parasitic stub 220. This arrangement can be understood as the opening directions of the first parasitic stub 220 and the second parasitic stub 230 being opposite. When the opening directions of the first parasitic stub 220 and the second parasitic stub 230 are opposite, the current directions of the first parasitic stub 220 and the second parasitic stub 230 are orthogonal or misaligned, so the coupling effect is weak. Based on this, the second parasitic stub 230 is approximately an independent resonant structure, and the third frequency band supported by the second parasitic stub 230 is mainly dominated by its own electrical length and has little association with the first parasitic stub 220. That is, the shorter the electrical length of the second parasitic stub 230, the higher the third frequency band, and the longer the electrical length of the second parasitic stub 230, the shorter the third frequency band. Therefore, when the opening directions of the first parasitic stub 220 and the second parasitic stub 230 are opposite, the third frequency band can be adjusted more flexibly, so that the second parasitic stub 230 can support any low-frequency band, medium-frequency band, high-frequency band or even ultra-high-frequency band according to requirements.

[0050] Furthermore, by adjusting the electrical length of the second parasitic stub 230, the third frequency band can be made the same as the second frequency band to jointly support the radiation of radio frequency signals in a unified frequency band, causing the radiation patterns to overlap, thereby improving the radiation efficiency of the foldable device in this frequency band. Exemplarily, both the second frequency band and the third frequency band are the N78 frequency band, or both the second frequency band and the third frequency band are the B8 frequency band.

[0051] In one embodiment, the antenna assembly further includes a tuning circuit for tuning the operating frequency band of the connected stub.

[0052] Specifically, the tuning circuit is connected to the feeding point and the feed source of the main stub 210 to tune the operating frequency band of the main stub 210 to the first frequency band. The tuning circuit includes but is not limited to at least one capacitive element and / or at least one inductive element. The tuning circuit can adjust the electrical length of the main stub 210 so that at least part of the main stub 210 can support the required first frequency band under the excitation of the feed source. The tuning circuit can be directly electrically connected or indirectly electrically connected to the feeding point. For example, the tuning circuit can be directly welded to the feeding point, or electrically connected through electrical connection components such as conductive wires, conductive elastic sheets, conductive adhesives, and circuit boards. The tuning circuit can be directly electrically connected or indirectly electrically connected to the reference ground. For example, the tuning circuit can be directly welded to the reference ground, or electrically connected through electrical connection components such as conductive wires, conductive elastic sheets, conductive adhesives, and circuit boards.

[0053] The tuning circuit is not connected to the first parasitic stub 220. In the related art, a tuning circuit is usually used to adjust the electrical length of the first parasitic stub 220 so that the first parasitic stub 220 can support the transceiver of radio frequency signals in different frequency bands. However, the introduction of the tuning circuit also requires adding a circuit board and a spring piece in actual engineering. The use of these devices will inevitably increase the cost and cause the occupation of the space inside the foldable device. In this embodiment, no additional tuning circuit is connected to the first parasitic stub 220. Instead, by using the idle space on the second body 120 and through the coupling effect between the second parasitic stub 230 and the first parasitic stub 220, the second parasitic stub 230 realizes the frequency band expansion or efficiency improvement of the foldable device. Moreover, since no tuning circuit is used in this embodiment, tuning devices with higher costs such as switches can be omitted, which has the advantage of low cost.

[0054] Continue to refer to Figures 3 to 6 , in one embodiment, the main stub 210 includes a third free end A3 and a third ground end B3, and the feeding point is provided between the third free end A3 and the third ground end B3. Among them, the extending direction of the main stub 210 is parallel to the extending direction of the first parasitic stub 220, and when the first body 110 and the second body 120 are in a folded state, the projections of the main stub 210 and the first parasitic stub 220 in the thickness direction of the foldable device at least partially overlap. In some embodiments, as shown in the figures, the projection of the first parasitic stub 220 in the thickness direction of the foldable device entirely falls on the main stub 210. Specifically, the projection of the first parasitic stub 220 in the thickness direction of the foldable device can fall on any end of the main stub 210, and the projection of the first parasitic stub 220 in the thickness direction of the foldable device can also fall on the middle of the main stub 210. This embodiment does not make a limitation.

[0055] In one embodiment, the first parasitic stub 220 is disposed near the third free end A3 of the main stub 210, and the end of the first parasitic stub 220 near the second parasitic stub 230 is aligned with the projection of the third free end A3 of the main stub 210 in the thickness direction of the foldable device. Specifically, when the end of the first parasitic stub 220 near the second parasitic stub 230 is aligned with the projection of the third free end A3 of the main stub 210 in the thickness direction of the foldable device, the first gap between the first parasitic stub 220 and the second parasitic stub 230 is aligned with the third free end A3 of the main stub 210. When there are other radiation stubs near the third free end A3 of the main stub 210, the second gap between the main stub 210 and the radiation stub can be aligned with the first gap, making the design of the radiation stubs of the foldable device more beautiful. Moreover, the projection of the second gap in the thickness direction of the foldable device can be staggered from the first parasitic stub 220 and the second parasitic stub 230, thereby avoiding the problem of the degradation of the radiation performance of the main stub 210 caused by the shielding of the first parasitic stub 220 and the second parasitic stub 230, that is, enabling the main stub 210 to have better radiation performance.

[0056] In one embodiment, the resonance modes of both the main stub 210 and the first parasitic stub 220 are 1 / 4 wavelength modes. Specifically, when resonating in the 1 / 4 wavelength mode, the impedance is purely resistive, and impedance matching can be achieved without additional reactive components, making the structure of the antenna assembly relatively simple. Moreover, the electrical lengths of both the main stub 210 and the first parasitic stub 220 are 1 / 4 of the corresponding wavelength. Compared with half-wavelength or full-wavelength devices, the size of the radiation stubs can be significantly reduced, thus being applicable to foldable devices with smaller sizes such as mobile phones. For example, when both the first frequency band and the second frequency band are the N78 frequency band, the electrical lengths of both the main stub 210 and the first parasitic stub 220 are approximately 21.4 mm. Considering the tuning effect of the tuning circuit on the main stub 210, the physical length of the main stub 210 can be slightly greater than the physical length of the first parasitic stub 220.

[0057] Figure 7 For an embodiment of Figure 3 the embodiment and Figure 5 the radiation efficiency diagram of the antenna assembly of the embodiment. When the opening of the first free end A1 of the first parasitic stub 220 faces right and the opening of the second free end A2 of the second parasitic stub 230 faces right as shown in Figure 3 the first parasitic stub 220, the second frequency band of the first parasitic stub 220 can be different from the third frequency band of the second parasitic stub 230. For example Figure 7 as shown, the second frequency band corresponding to the first parasitic stub 220 is the N78 frequency band, and the third frequency band corresponding to the second parasitic stub 230 is the B41 frequency band. The two parasitic stubs respectively enhance the efficiency of the B41 and N78 frequency bands. When using asFigure 5 When the opening at the first free end A1 of the first parasitic stub 220 faces right and the opening at the second free end A2 of the second parasitic stub 230 faces left as shown, the second frequency band of the first parasitic stub 220 can be the same as or close to the third frequency band of the second parasitic stub 230. For example Figure 7 As shown, the second frequency band corresponding to the first parasitic stub 220 is the N78 frequency band, and the third frequency band corresponding to the second parasitic stub 230 is slightly higher than the N78 frequency band. The two parasitic stubs jointly enhance the efficiency of the N78 frequency band, significantly improving the N78 efficiency.

[0058] Figure 8 For an embodiment of Figure 4 the embodiment and Figure 6 the radiation efficiency diagram of the antenna assembly of the embodiment. When the opening at the first free end A1 of the first parasitic stub 220 faces left and the opening at the second free end A2 of the second parasitic stub 230 faces left as shown Figure 4 the second frequency band of the first parasitic stub 220 can be different from the third frequency band of the second parasitic stub 230. For example Figure 8 As shown, the second frequency band corresponding to the first parasitic stub 220 is the N78 frequency band, and the third frequency band corresponding to the second parasitic stub 230 is the B41 frequency band. The two parasitic stubs respectively enhance the efficiency of the B41 and N78 frequency bands. When the opening at the first free end A1 of the first parasitic stub 220 faces left and the opening at the second free end A2 of the second parasitic stub 230 faces right as shown Figure 6 the second frequency band of the first parasitic stub 220 can be the same as or close to the third frequency band of the second parasitic stub 230. For example Figure 8 As shown, the second frequency band corresponding to the first parasitic stub 220 is the N78 frequency band, and the third frequency band corresponding to the second parasitic stub 230 is slightly higher than the N78 frequency band. The two parasitic stubs jointly enhance the efficiency of the N78 frequency band, significantly improving the N78 efficiency.

[0059] It can be seen from this that by reasonably distributing the first parasitic stub 220 and the second parasitic stub 230 on the second body 120 of the foldable device and adjusting the opening direction and resonant frequency of the parasitic stubs, the efficiency of the antenna assembly in the folded state can be improved without using any tuning circuits, and the antenna efficiency in the folded state can be increased by 1 dB to 2 dB.

[0060] In one embodiment, the projection of the main branch 210 and the second parasitic branch 230 in the thickness direction of the foldable device at least partially overlaps. The second parasitic branch 230 is used to couple with the main branch 210 and the first parasitic branch 220 respectively to generate a second parasitic current for supporting the third frequency band. Specifically, by arranging the second parasitic branch 230 to couple with multiple antennas respectively, the coupling effect of the second parasitic branch 230 can be enhanced, thereby improving the radiation performance of the second parasitic branch 230. Moreover, the overlapping dimension of the projection of the second parasitic branch 230 in the thickness direction of the foldable device and the main branch 210 can be designed according to requirements to draw the current of the main branch 210 and adjust the radiation pattern when the foldable device operates in the first frequency band.

[0061] Continuing to refer to Figure 2 , in one embodiment, the foldable body further includes a rotating shaft 130 for rotatably connecting the first body 110 and the second body 120. The first body 110 includes a first side 111, and the second body 120 includes a second side 121. The extending directions of the first side 111 and the second side 121 intersect with the extending direction of the rotating shaft 130, and when the first body 110 and the second body 120 are in the unfolded state, the first side 111 is located on the extension line of the second side 121. That is to say, the first side 111 and the second side 121 can be connected as the long side of the foldable device in the unfolded state, and the third side 122 serves as the short side of the foldable device in the unfolded state.

[0062] The main branch 210 is arranged on the first side 111, and the first parasitic branch 220 and the second parasitic branch 230 are both arranged on the second side 121. Exemplarily, the main branch 210 and the first parasitic branch 220 can be arranged close to the rotating shaft 130 of the foldable device, and the second parasitic branch 230 is arranged on the side of the first parasitic branch 220 away from the rotating shaft 130. Exemplarily, the main branch 210 and the first parasitic branch 220 can be arranged away from the rotating shaft 130 of the foldable device, and the second parasitic branch 230 is arranged on the side of the first parasitic branch 220 close to the rotating shaft 130. Specifically, the main branch 210 can be arranged at a position that is not easily blocked by the user's hand, and the first parasitic branch 220 is correspondingly arranged according to the position of the main branch 210, so that the first parasitic branch 220 is symmetrically arranged with the main branch 210 about the rotating shaft 130, and the second parasitic branch 230 is arranged according to the idle position on the second body 120, so as to more flexibly arrange the positions of multiple radiation branches.

[0063] Figure 9 FIG. is a second schematic structural diagram of the foldable device in the unfolded state of an embodiment. Refer to Figure 9, in one embodiment, the foldable body further includes a rotating shaft 130 for rotatably connecting the first body 110 and the second body 120. The first body 110 includes a first side 111, and the second body 120 includes a connected second side 121 and a third side 122. The extending directions of the first side 111 and the second side 121 intersect with the extending direction of the rotating shaft 130, and when the first body 110 and the second body 120 are in an unfolded state, the first side 111 is located on the extension line of the second side 121.

[0064] Among them, the main branch 210 is arranged on the first side 111, the first parasitic branch 220 is arranged on the second side 121, and the second parasitic branch 230 is arranged on the third side 122. Specifically, the above arrangement can make the first parasitic branch 220 and the second parasitic branch 230 correspond to the corners of the foldable device. When the user uses the foldable device in portrait mode, since the user's hand generally holds the lower half of the long side of the foldable device or the lower short side of the foldable device, when the first parasitic branch 220 and the second parasitic branch 230 are located on different sides of the foldable device respectively, it is difficult for the two parasitic antennas to be held by the user at the same time, so as to ensure that at least one of the two parasitic antennas can work normally, and further make the foldable device to which the above antenna assembly is applied have a relatively good communication effect.

[0065] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0066] The above embodiments only express several implementation manners of the embodiments of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the embodiments of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the embodiments of the present application. Therefore, the protection scope of the patent of the embodiments of the present application should be subject to the appended claims.

Claims

1. A foldable device, characterized in that, Comprising a foldable body and an antenna assembly; The foldable body includes a first body and a second body, and the first body is movably connected to the second body to present a folded state or an unfolded state; The antenna assembly includes a main stub provided on the first body, and a first parasitic stub and a second parasitic stub provided on the second body; the main stub has a feeding point for connecting a feeder, and the main stub is configured to generate an exciting current under the excitation of the feeding signal provided by the feeder. When the first body and the second body are in the folded state and there is an exciting current in the main stub that supports the first frequency band, the first parasitic stub is configured to be coupled with the main stub to generate a first parasitic current for supporting the second frequency band, and the second parasitic stub is configured to be coupled with the first parasitic stub to generate a second parasitic current for supporting the third frequency band; Wherein, the second frequency band is not lower than the first frequency band.

2. The foldable device according to claim 1, wherein, The first parasitic stub has a first free end and a first grounding end, the second parasitic stub has a second free end and a second grounding end, and the second free end is close to the first grounding end, or the second grounding end is close to the first free end; Wherein, the third frequency band is lower than the second frequency band.

3. The foldable device according to claim 1, characterized in that, The first parasitic stub has a first free end and a first grounding end, the second parasitic stub has a second free end and a second grounding end, and the second free end is close to the first free end or the second grounding end is close to the first grounding end; Wherein, the third frequency band is the same as the second frequency band.

4. The foldable device according to claim 2 or 3, characterized in that, The main stub includes a third free end and a third grounding end, and the feeding point is provided between the third free end and the third grounding end; The extending direction of the main stub is parallel to the extending direction of the first parasitic stub, and when the first body and the second body are in the folded state, the projections of the main stub and the first parasitic stub in the thickness direction of the foldable device at least partially overlap.

5. The foldable device according to claim 4, characterized in that, The first parasitic stub is disposed close to the third free end of the main stub, and the end of the first parasitic stub close to the second parasitic stub is aligned with the projection of the third free end of the main stub in the thickness direction of the foldable device.

6. The foldable device according to claim 4, wherein, The projections of the main stub and the second parasitic stub in the thickness direction of the foldable device at least partially overlap; Wherein, the second parasitic stub is configured to be coupled with the main stub and the first parasitic stub respectively to generate a second parasitic current for supporting the third frequency band.

7. The foldable device according to claim 1, wherein, The antenna assembly further includes a tuning circuit, and the tuning circuit is configured to adjust the working frequency band of the connected stub; Wherein, the tuning circuit is connected to the feeding point of the main stub and the feeder to adjust the working frequency band of the main stub to the first frequency band, and the tuning circuit is not connected to the first parasitic stub.

8. The foldable device according to claim 7, wherein, The resonance modes of the main stub and the first parasitic stub are both 1 / 4 wavelength modes.

9. The foldable device according to claim 1, wherein The foldable body further includes a rotating shaft, and the rotating shaft is used for rotatably connecting the first body and the second body; The first body includes a first side edge, the second body includes a second side edge, the extending directions of the first side edge and the second side edge both intersect with the extending direction of the rotating shaft, and when the first body and the second body are in an unfolded state, the first side edge is located on the extension line of the second side edge; Wherein, the main branch is arranged on the first side edge, and the first parasitic branch and the second parasitic branch are both arranged on the second side edge.

10. The foldable device according to claim 1, wherein, The first frequency band, the second frequency band and the third frequency band are all n78 frequency bands; or The first frequency band and the second frequency band are both n78 frequency bands, and the third frequency band is n41 frequency band; or The first frequency band, the second frequency band and the third frequency band are all B8 frequency bands.

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