Terminal device

Abstract

The utility model relates to terminal equipment. The terminal equipment comprises a mainboard, an antenna suspension branch knot, a feed source, a first lead and a second lead. The antenna suspension branch knot is arranged in a non-shielding area of the terminal device, a rectangular groove is formed in the main board, and the rectangular groove is provided with a groove bottom and an opening side opposite to the groove bottom. And the antenna suspension branch knot is arranged to be spaced from the main board and is opposite to the opening side and the groove bottom of the rectangular groove. The feed source is connected to the feed point, and the feed point is arranged in the middle of the opening side of the rectangular groove. The metal layer of the mainboard is provided with a first end and a second end on the two sides of the opening side in the length direction of the antenna suspension branch knot, the first lead extends from the feeding point in the length direction of the antenna suspension branch knot and is electrically connected to the first end, and the second lead extends from the feeding point in the length direction of the antenna suspension branch knot and is electrically connected to the second end. Therefore, through a simple structure, the characteristic that the directional diagram faces the antenna suspension branch knot direction can be realized, so that the proportion of the upper hemisphere is improved, and the communication performance is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to communication field especially terminal equipment. BACKGROUND

[0002] An antenna assembly is usually included in an electronic device to realize the communication function of the electronic device. However, the communication performance of the antenna assembly in the electronic device in the related art when communicating with a satellite is not good enough, and there is still room for improvement. SUMMARY

[0003] Embodiments of the utility model provide a kind of terminal equipment, including mainboard, antenna suspension branch, feed source, first lead wire and second lead wire, the antenna suspension branch is arranged in the non-shielding area of the terminal equipment, rectangular slot is arranged on the mainboard, the rectangular slot has groove bottom and the opening side opposite to the groove bottom;The antenna suspension branch is arranged with the interval between the mainboard, and the opening side and the groove bottom of the rectangular slot are opposite;The feed source is connected to feed point, and the feed point is arranged in the intermediate position of the opening side of the rectangular slot;The first end and the second end of the metal layer of the mainboard have on the length direction of the opening side of the antenna suspension branch, first lead wire extends from the feed point along the length direction of the antenna suspension branch and is electrically connected to the first end, and second lead wire extends from the feed point along the length direction of the antenna suspension branch and is electrically connected to the second end.

[0004] Optionally, the antenna suspension branch is configured to form a surface current distribution corresponding to a half-wavelength mode.

[0005] Optionally, the rectangular slot is configured to excite a half-wavelength mode of the antenna suspension branch, and a current distribution thereof corresponds to a surface current distribution of the half-wavelength mode of the antenna suspension branch.

[0006] Optionally, the length of the antenna suspension branch is about one-half of an equivalent electric wave length of an antenna target frequency;And / or the interval distance between the antenna suspension branch and the mainboard is less than one-eighth of the equivalent electric wave length of the antenna target frequency;And / or the length of the rectangular slot is one-fourth to one-eighth of the length of the antenna suspension branch;And / or the depth of the rectangular slot in the direction away from the antenna suspension branch is one-fourth to one-eighth of the length of the rectangular slot;And / or the size of the lead wire in the thickness direction perpendicular to the length direction in the plane where the opening side of the rectangular slot is located is 1 to 3 layers of wiring thickness of the mainboard.

[0007] Optionally, a middle position of the rectangular slot in the length direction is substantially aligned with a middle position of the antenna floating branch in the length direction; and / or the rectangular slot is filled with a non-metallic base material of the mainboard.

[0008] Optionally, the antenna floating branch is arranged at a frame position of the terminal device.

[0009] Optionally, the mainboard has a length direction, a width direction and a thickness direction, and has an edge adjacent to and opposite to the antenna floating branch in the length direction or the width direction of the mainboard, and the rectangular slot is located at the edge of the mainboard, and the opening side and the slot bottom of the rectangular slot are opposite to the antenna floating branch in the length direction or the width direction of the mainboard.

[0010] Optionally, the rectangular slot penetrates through the mainboard in the thickness direction of the mainboard.

[0011] Optionally, the antenna floating branch is arranged on a battery cover of the terminal device.

[0012] Optionally, the antenna floating branch is opposite to the mainboard in the thickness direction of the mainboard; the mainboard is attached to a metal middle frame of the terminal device, and the slot bottom is on the metal middle frame. BRIEF DESCRIPTION OF DRAWINGS

[0013] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout the figures, and in which:

[0014] Figure 1 An exemplary structural schematic diagram of a terminal device according to at least one embodiment of the present application is shown.

[0015] Figure 2 A current distribution schematic diagram of an antenna floating branch in Figure 1 is shown.

[0016] Figure 3 Directional diagrams of a conventional scheme and Figure 1 are shown.

[0017] Figure 4 S-parameter curves and efficiency curves of the scheme shown in Figure 1 are shown.

[0018] Figure 5 An exemplary structural schematic diagram of a terminal device according to at least another embodiment of the present application is shown.

[0019] Figure 6 The current distribution of the antenna suspended branch in the Figure 5 is shown.

[0020] Figure 7 The directional diagram of the scheme shown. Figure 5 DETAILED DESCRIPTION

[0021] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to convey the scope of the present application to those skilled in the art.

[0022] Those skilled in the art should understand that the terms "first", "second", etc. in the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence, and there is no additional limitation.

[0023] The present application provides a terminal device. The terminal device uses a rectangular slot arranged on a mainboard as a feeding structure of an antenna suspended branch arranged on the terminal device (such as the upper part), excites the antenna suspended branch, and makes the antenna suspended branch induce current. The antenna suspended branch forms a surface current distribution as an antenna radiator on one hand, and acts as a director to direct the antenna pattern to shift towards the direction of the antenna suspended branch. At the same time, the terminal device can reflect at least part of the electromagnetic waves radiated by the antenna suspended branch back, so that the terminal device can act as a reflector to further reflect the pattern towards the direction of the antenna suspended branch. In this way, a better upper hemisphere ratio can be achieved, thereby improving the communication performance of the terminal device.

[0024] The upper hemisphere ratio is an important indicator of antenna performance. The upper hemisphere ratio refers to the proportion of the antenna's ability to radiate or receive signals in the upper hemisphere space. The upper hemisphere ratio reflects the distribution of the antenna's directional gain or radiation intensity in the upper hemisphere space relative to the entire sphere. In satellite communication, GPS navigation and other applications, signals mainly come from satellites in high altitude. Therefore, the radiation and reception ability of the antenna in the upper hemisphere space directly affects the reception quality of the signal. A higher upper hemisphere ratio means that the antenna can better receive these high-altitude signals, thereby improving the stability and accuracy of communication. In addition, in a complex wireless communication environment, signals may be subject to various interferences (such as multipath effect, electromagnetic interference, etc.). A higher upper hemisphere ratio helps to reduce the impact of these interferences on signals and improves the anti-interference ability of the communication system.

[0025] ​The terminal device can be any device with an antenna structure (such as at least one antenna), for example, but not limited to, a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, an augmented reality (AR) / virtual reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), an Internet of Things device, a smart television, and the like. The specific type of the terminal device is not limited in the embodiments of the present application.

[0026] For example, the terminal device can be a station (STATION, ST) in a WLAN (Wireless Local Area Network), a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA) device, a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a computer, a laptop, a handheld communication device, a handheld computing device, and / or other devices for communicating over a wireless system, and a next-generation communication system, for example, a mobile terminal in a 5G (the Fifth Generation mobile communication technology) network, a mobile terminal in a future evolved public land mobile network (PLMN), or a mobile terminal in a future evolved non-terrestrial network (NTN), etc.

[0027] As an example but not limitation, when the terminal device is a wearable device, the wearable device can also be a general term of application of wearable technology to the intelligent design of daily wear, and the development of wearable devices, such as gloves, watches, etc. configured with a near field communication module. The wearable device is a portable device directly worn on the body or integrated into the user's clothes or accessories. Through attachment to the user, through the pre-bound electronic card, the operation of payment, authentication, etc. is performed. The wearable device is not only a hardware device, but also a powerful function through software support and data interaction, cloud interaction. The general wearable smart device includes full function, large size, and can realize complete or partial function without relying on a smart phone, such as a smart watch or smart glasses, etc., and only focuses on a certain application function, and needs to cooperate with other devices such as a smart phone, such as various smart watches, smart bracelets, etc. with a display screen.

[0028] Figure 1 An exemplary structure diagram of a terminal device according to at least one embodiment of the present application is shown.

[0029] Referring to Figure 1 , the terminal device includes a mainboard 31 (i.e. a PCB board), an antenna floating branch 21, a feed source, a first lead 11, and a second lead 12.

[0030] The antenna floating branch 21 is arranged in a non-occluded area of the terminal device. The non-occluded area refers to an area that is not easily occluded by the user when the terminal device is in use. In this way, the radiation pattern can be directed to an area that is not easily occluded. Exemplarily, the non-occluded area can refer to the upper part of the terminal device. For example, the upper part of the smart phone refers to the part where the camera, earpiece, etc. are located. Generally, the upper frame position of the terminal device is an area that is not easily occluded, so in some exemplary embodiments, the antenna floating branch 2 can be arranged at or near the upper frame position of the terminal device.

[0031] The mainboard 31 is provided with a rectangular slot 32. The mainboard 31 has a metal layer, which is a conductive layer on the mainboard 31 for arranging circuit wires and is composed of a material with good conductivity (such as copper foil). The main function of the metal layer is to conduct current, connect various electronic components, and realize circuit functions. The rectangular slot 32 provided on the mainboard can be in communication with the metal layer on both sides in the length direction of the antenna floating branch 21. In the case that the rectangular slot 32 penetrates the entire thickness direction of the mainboard, the rectangular slot 32 is equivalent to a rectangular groove (or notch) shape formed on all layers of the mainboard, so a corresponding rectangular groove (or notch) shape is also formed on the conductive metal layer. That is, the corresponding rectangular groove (or notch) shape formed on the conductive metal layer is equivalent to part of the rectangular slot.

[0032] The length of the antenna floating branch 21 is denoted as l1, and the clearance is denoted as d1. The length l1 of the antenna floating branch 21 refers to the total length of the antenna floating branch 21 along its main extension direction. The clearance d1 refers to the distance between the antenna floating branch 21 and the obstacle below. For example, Figure 1 The clearance d1 in FIG. 1 refers to the distance between the antenna floating branch 21 and the main board 31.

[0033] The length of the rectangular slot 32 is denoted as l2, and the width is denoted as d2. The length l2 of the rectangular slot 32 refers to the dimension of the rectangular slot in the direction parallel to the length direction of the antenna floating branch 21. The width d2 of the rectangular slot 32 refers to the dimension in the direction perpendicular to the length direction of the rectangular slot and perpendicular to the thickness direction of the main board 31.

[0034] The rectangular slot 32 has a slot bottom and an opening side opposite to the slot bottom. The slot bottom refers to the bottom of the rectangular slot 32, i.e., the slot bottom can be a bottom plane parallel to the length direction and the thickness direction of the rectangular slot 32 at the bottom of the rectangular slot 32. The opening side refers to the upper opening of the rectangular slot 32 opposite to the bottom.

[0035] The antenna floating branch 21 is arranged to have a spacing between the main board 31 and opposite to the opening side and the slot bottom of the rectangular slot 32. The middle position in the length direction of the rectangular slot 32 can be aligned or substantially aligned with the middle position in the length direction of the antenna floating branch 21. The feed source is connected to the feed point 13 (i.e., shown by the red arrow in the figure), and the feed point 13 is arranged at the middle position of the opening side of the rectangular slot 32.

[0036] The metal layer of the main board 31 has a first end and a second end on both sides of the opening side in the length direction of the antenna floating branch 21. The first lead wire 11 extends from the feed point 13 along the length direction of the antenna floating branch 21 and is electrically connected to the first end. The second lead wire 12 extends from the feed point 13 along the length direction of the antenna floating branch 21 and is electrically connected to the second end.

[0037] The positions of the first lead wire 11 and the second lead wire 12 are not specially limited in the utility model, as long as they can be connected to the metal layer (or connected to the metal layer through a through hole). For example, the first lead wire 11 and the second lead wire 12 can be located on one side close to the front and back surfaces of the main board (one end of the width direction of the opening side of the rectangular slot, i.e., on the intersection edge of the opening side and the adjacent side surface), or at the middle position in the width direction of the opening side of the rectangular slot. In some exemplary embodiments, the first lead wire 11 and the second lead wire 12 can be two metal strip structures.

[0038] The first and second feed lines 11 and 12 are used to transmit the electrical signal inputted by the feed point 13 to both sides of the rectangular slot 32, so as to generate the whole current distribution in the rectangular slot 32 and other positions nearby, and induce the current in the antenna floating branch 21. Thus, the rectangular slot 32 (especially the notch formed in the metal layer of the main board 31 when the rectangular slot 32 penetrates through the thickness direction of the main board, which can be referred to the notch described above) can act as a feed structure to excite the antenna floating branch 21, so that the antenna floating branch 21 induces the current.

[0039] The antenna floating branch 21 can act as a director, which is configured to direct the radiated energy to concentrate in the direction of the antenna floating branch 21, so as to achieve the stronger directional pattern characteristic of the terminal device in the direction of the antenna floating branch 21. Meanwhile, the terminal device can act as a reflector to further reflect the directional pattern to radiate in the direction of the antenna floating branch 21.

[0040] In some example embodiments, the antenna floating branch 21 is configured to form a surface current distribution corresponding to a half-wavelength mode. The rectangular slot 32 can be configured to excite the half-wavelength mode of the antenna floating branch 21, and the current distribution thereof corresponds to the surface current distribution of the half-wavelength mode of the antenna floating branch 21. The current distribution of the half-wavelength mode is that the current is zero at both ends and strong in the middle, and the current on the whole antenna floating branch 21 is in the same direction.

[0041] Figure 2 The current distribution of the antenna floating branch in the terminal device is shown in FIG. 6. In FIG. 6, Figure 1 In FIG. 6, different colors are used to represent different sizes of the current. In particular, the current represented by the blue color is smaller, and the current represented by the red color is larger. Figure 2

[0042] As shown in FIG. 7, the rectangular slot 32 is a slot structure penetrating through the thickness direction of the main board. The bottom and two sides of the slot structure are the cross section of the main board, and the top and the other two sides of the slot structure are open. The rectangular slot 32 excites the stronger half-wavelength current distribution on the antenna floating branch 21. Figure 2

[0043] ​​For example, the length (i.e., l1) of the antenna floating branch 21 can be about one-half of the equivalent wavelength of the antenna target frequency; and / or the spacing distance (i.e., clearance) between the antenna floating branch 21 and the main board can be less than one-eighth of the equivalent wavelength of the antenna target frequency; and / or the length (i.e., l2) of the rectangular slot 32 is one-fourth to one-eighth of the length of the antenna floating branch 21; and / or the depth (i.e., the distance between the opening side of the rectangular slot 32 and the slot bottom) of the rectangular slot 32 in the direction away from the antenna floating branch 21 is one-fourth to one-eighth of the length of the rectangular slot 32; and / or the dimension of the lead in the thickness direction perpendicular to the length direction in the plane of the opening side of the rectangular slot 32 is 1 to 3 layers of the wiring thickness of the main board.

[0044] In some example embodiments, the rectangular slot 32 can be filled with a non-metallic base material (such as substrate FR4) of the main board for supporting the first lead 11, the second lead 12, and the feeding point 13.

[0045] In some example embodiments, the antenna floating branch 21 can be arranged at the frame position of the terminal device. The main board has a length direction, a width direction, and a thickness direction, and has an edge adjacent to and opposite to the antenna floating branch 21 in the length direction or the width direction of the main board. Figure 1 The direction indicated by arrow A can be regarded as the width direction of the main board 31, the direction indicated by arrow B can be regarded as the length direction of the main board 31, and the direction perpendicular to the direction indicated by arrow A and perpendicular to the direction indicated by arrow B is the thickness direction. The rectangular slot 32 is located at the edge of the main board, and the opening side and the slot bottom of the rectangular slot 32 are opposite to the antenna floating branch 21 in the length direction or the width direction of the main board. The rectangular slot 32 can penetrate the main board in the thickness direction of the main board.

[0046] Figure 3 The directional diagram of the conventional scheme and Figure 1 The directional diagram of the scheme shown. Among them, the left view is the directional diagram of the conventional scheme, and the right view is the directional diagram of the scheme. Among them, Figure 3is a schematic diagram of a radiation pattern obtained by testing a GPS L1 frequency band. The GPS L1 frequency band is a core frequency band in a global navigation satellite system (GNSS), and the center frequency of the L1 frequency band is 1575.42 MHz. The radiation pattern can represent the radiation intensity of the antenna in different directions. After obtaining the antenna pattern, the total energy of the radiation in the upper hemisphere can be determined by integrating the radiation intensity in the upper hemisphere range of the radiation pattern. Similarly, the total energy of the antenna radiation can be obtained by integrating the entire radiation pattern. The upper hemisphere ratio can be obtained by dividing the upper hemisphere radiation energy by the total radiation energy. According to Figure 3 It can be seen that the upper hemisphere ratio of the conventional scheme is basically the same as the lower hemisphere ratio, that is, the upper hemisphere ratio of the conventional scheme is about 50%, and the radiation pattern of the present application is basically upward at the GPS L1 frequency point 1.6 GHz, and the upper hemisphere ratio is as high as 67.6%, realizing a good upper hemisphere ratio antenna scheme design.

[0047] Figure 4 The structure of the terminal device according to the present application is shown. Figure 1 The S parameter curve and the efficiency curve of the scheme shown are shown. Among them, Figure 4 is a schematic diagram of the S parameter curve and the efficiency curve obtained by testing the GPS L1 frequency band. The left view is the S parameter curve, and the right view is the efficiency curve. Figure 4 The output reflection coefficient S22 of the S parameter curve in is small at 1.6 GHz (i.e. the GPS L1 frequency band), indicating that the impedance matching is good, Figure 4 The efficiency curve in has the highest efficiency at 1.6 GHz. Therefore, according to Figure 4 It can be seen that, Figure 1 The scheme shown has good impedance matching and efficiency in the GPS L1 frequency band, and good resonance is realized.

[0048] In the present application, the antenna floating branch 21 is not limited to being arranged at the frame position of the terminal device, but can also be arranged at other non-shielding areas (for example, on the battery cover of the terminal device, such as the relatively upper area on the battery cover) of the upper part of the terminal device, and the same feeding structure is adopted. In this way, the radiation pattern will still be inclined towards the direction of the antenna floating branch, so that a good upper hemisphere ratio can also be achieved.

[0049] Figure 5 The structure of the terminal device according to the present application is shown.

[0050] As Figure 5As shown, the antenna floating branch 21 is arranged on the battery cover of the terminal device. The antenna floating branch 21 is opposite to the mainboard 31 in the thickness direction of the mainboard 31 (i.e. the direction shown by the arrow C in the figure). The metal layer of the mainboard 31 has a first end and a second end on both sides of the length direction of the antenna floating branch 21 at the opening side. The first lead wire 11 extends from the feeding point 13 along the length direction of the antenna floating branch 21 and is electrically connected to the first end. The second lead wire 12 extends from the feeding point 13 along the length direction of the antenna floating branch 21 and is electrically connected to the second end.

[0051] The rectangular slot 32, the first lead wire 11, the second lead wire 12 and the feeding point 13 can be referred to the relevant description in the foregoing embodiment, for example, the rectangular slot 32 can penetrate the mainboard 31 in the thickness direction of the mainboard 31. The difference is that the mainboard 31 is attached to the metal middle frame 14 of the terminal device, and the slot bottom of the rectangular slot 32 is on the metal middle frame 14. That is to say, the rectangular slot 32 still penetrates the mainboard 31 in the thickness direction of the mainboard 31, but the metal middle frame 14 attached to one of the penetration faces of the terminal device can be regarded as the slot bottom of the rectangular slot 32. Figure 1

[0052] On the basis that the first lead wire 11 and the second lead wire 12 transmit the electrical signal input by the feed source through the feeding point 13 to both sides of the rectangular slot 32 (i.e. introduce the electrical signal to the metal layer on both sides of the rectangular slot 32), the two ends of the first lead wire 11 and the second lead wire 12 (for example, through the through hole) can also be connected to the metal middle frame 14 of the slot bottom, so as to guide the electrical signal introduced from the feeding point 13 to the metal middle frame 14. Guiding the electrical signal introduced from the feeding point 13 to the metal middle frame 14 can make the rectangular slot 32 form a loop current, so as to better excite the antenna floating branch 21 and induce the current in the antenna floating branch 21.

[0053] Figure 6 The current distribution diagram of the antenna floating branch in the embodiment shown in Figure 5 is shown.

[0054] As shown in Figure 6 , the rectangular slot 32 and the position of the mainboard near the rectangular slot 32 can form a current, and under the main excitation of the rectangular slot 32, the antenna floating branch 21 can induce a current. Among them, a larger current can be induced at the position of the antenna floating branch 21 corresponding to the rectangular slot 32, and a smaller current can be induced at the two sides of the antenna floating branch 21 deviating from the rectangular slot 32.

[0055] Figure 7 The directional diagram of the scheme shown in Figure 5 is shown.

[0056] ​As shown in 7, when the antenna suspension 21 is arranged on the battery cover of the terminal device, the terminal device can reflect the electromagnetic signal radiated by the antenna suspension 21 along the direction from the bottom of the rectangular slot 32 to the antenna suspension 21, so that the radiation pattern is tilted towards the side where the antenna suspension 21 is located (i.e., the back side where the battery cover is located).

[0057] Back Figure 3 ,exist Figure 3 In the embodiment shown where the antenna sling 21 is positioned above the terminal device, the terminal device can reflect most of the electromagnetic signals radiated by the antenna sling 21 to the area above the terminal device (or the antenna sling 21). Combined with... Figure 3 and Figure 7 It can be seen that placing the antenna stalk 21 on the top of the terminal device or on the battery cover, both of these arrangements cause the radiation pattern to tilt toward the direction of the antenna stalk, proving the effectiveness of the characteristic that "the antenna stalk can act as a director, guiding the antenna radiation pattern to shift toward the direction of the antenna stalk".

[0058] In summary, this utility model, by adopting an antenna scheme of "rectangular slot feeding structure + antenna suspension stub", can achieve the characteristic that the radiation pattern is oriented towards the antenna suspension stub, and the overall structure is simple.

[0059] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A terminal device, characterized by comprising: The terminal device comprises a main board, an antenna floating branch, a feed source, a first lead wire and a second lead wire, the antenna floating branch is arranged in a non-occlusion area of the terminal device, a rectangular slot is arranged on the main board, the rectangular slot has a slot bottom and an opening side opposite to the slot bottom; the antenna floating branch is arranged to have a spacing with the main board, and is opposite to the opening side and the slot bottom of the rectangular slot; the feed source is connected to a feeding point, the feeding point is arranged at a middle position of the opening side of the rectangular slot; the metal layer of the main board has a first end and a second end on both sides of the opening side in the length direction of the antenna floating branch, the first lead wire extends from the feeding point along the length direction of the antenna floating branch and is electrically connected to the first end, and the second lead wire extends from the feeding point along the length direction of the antenna floating branch and is electrically connected to the second end.

2. The terminal device according to claim 1, wherein the antenna floating branch is configured to form a surface current distribution corresponding to a half-wavelength mode.

3. The terminal device according to claim 2, wherein the rectangular slot is configured to excite the half-wavelength mode of the antenna floating branch, and the current distribution thereof corresponds to the surface current distribution of the half-wavelength mode of the antenna floating branch.

4. The terminal device according to claim 1, wherein the length of the antenna floating branch is about one half of the equivalent electric wave length of an antenna target frequency; and / or the spacing distance between the antenna floating branch and the main board is less than one eighth of the equivalent electric wave length of the antenna target frequency; and / or the length of the rectangular slot is one fourth to one eighth of the length of the antenna floating branch; and / or the depth of the rectangular slot in the direction away from the antenna floating branch is one fourth to one eighth of the length of the rectangular slot; and / or the size of the lead wire in the thickness direction perpendicular to the length direction in the plane where the opening side of the rectangular slot is located is 1 to 3 times the thickness of the wiring of the main board.

5. The terminal device according to claim 1, wherein the middle position of the length direction of the rectangular slot is substantially aligned with the middle position of the length direction of the antenna floating branch; and / or the rectangular slot is filled with a non-metallic base material of the main board.

6. The terminal device according to claim 1, wherein the antenna floating branch is arranged at a frame position of the terminal device.

7. The terminal device according to claim 6, wherein the main board has a length direction, a width direction and a thickness direction, and has an edge adjacent to and opposite to the antenna floating branch in the length direction or the width direction of the main board, and the rectangular slot is located at the edge of the main board, and the opening side and the slot bottom of the rectangular slot are opposite to the antenna floating branch in the length direction or the width direction of the main board.

8. The terminal device according to claim 7, wherein the rectangular slot penetrates through the main board in the thickness direction of the main board. 9.The terminal device of claim 1, wherein the antenna floating stub is arranged on a battery cover of the terminal device. 10.The terminal device of claim 9, wherein the antenna floating stub is opposite to the mainboard in a thickness direction of the mainboard; the mainboard is attached to a metal middle frame of the terminal device, and the slot bottom is on the metal middle frame.

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