CN113555685A

CN113555685A - Electronic device

Info

Publication number: CN113555685A
Application number: CN202110829005.5A
Authority: CN
Inventors: 邾志民; 简宪静
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2021-07-22
Filing date: 2021-07-22
Publication date: 2021-10-26

Abstract

The application provides an electronic equipment belongs to electronic product technical field, electronic equipment includes: the antenna unit comprises a radiating body and a flexible circuit board, wherein the radiating body is arranged in the display module; the flexible circuit board comprises a first feeder line, a filter, a second feeder line, a first floor and an insulating dielectric slab, wherein the first floor and the insulating dielectric slab are arranged in a laminated mode, the first feeder line, the filter and the second feeder line are respectively laid on the insulating dielectric slab, and the first feeder line, the filter and the second feeder line are respectively oppositely separated from the first floor; the circuit board is electrically connected with the first end of the filter through the first feeder line, and the second end of the filter is electrically connected with the radiator through the second feeder line.

Description

Electronic device

Technical Field

The application relates to the technical field of electronic equipment products, in particular to electronic equipment.

Background

Antennas in electronic devices are often subject to significant clutter during the transmission of radio frequency signals. Therefore, a filter is usually added to the signal transmission line of the antenna to filter the rf signal. In the prior art, a filter is usually attached (welded) to a signal transmission line of an antenna, however, in this way, when a radio frequency signal flows through a welding point of the signal transmission line and the filter, a large loss is generated, and thus, the gain of the antenna is reduced. Therefore, the existing electronic equipment has the problem of poor signal transmission effect of the antenna.

Disclosure of Invention

The application provides a pair of electronic equipment, can solve the relatively poor problem of signal transmission effect of the antenna that current electronic equipment exists.

An embodiment of the present application provides an electronic device, including: the antenna unit comprises a radiating body and a flexible circuit board, wherein the radiating body is arranged in the display module;

the flexible circuit board comprises a first feeder line, a filter, a second feeder line, a first floor and an insulating dielectric slab, wherein the first floor and the insulating dielectric slab are arranged in a laminated mode, the first feeder line, the filter and the second feeder line are respectively laid on the insulating dielectric slab, and the first feeder line, the filter and the second feeder line are respectively oppositely separated from the first floor;

the circuit board is electrically connected with the first end of the filter through the first feeder line, and the second end of the filter is electrically connected with the radiator through the second feeder line.

In the embodiment of the application, the first feeder line and the second feeder line are connected by using the filter, so that the filter is integrated in the signal transmission line of the antenna, and compared with a mode of adopting a surface-mounted filter in the prior art, the filtering function of the signal transmission line of the antenna can be realized without additionally arranging welding spots, and the loss of radio-frequency signals in the transmission process is reduced. In addition, the first feeder line and the second feeder line are connected through the filter, namely the filter can be used as a wiring between the first feeder line and the second feeder line, so that the length of the wiring in the signal transmission line can be reduced, and the loss in the wiring in the radio frequency signal transmission process is further reduced. Therefore, the problem that the signal transmission effect of the antenna of the existing electronic equipment is poor can be solved.

Drawings

FIG. 1 is a schematic diagram illustrating a connection between a display module and a flexible circuit board according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram illustrating a connection between a radiator and a flexible circuit board according to an embodiment of the present application;

FIG. 3 is an exploded view of the structure of FIG. 2;

fig. 4 is an exploded view of a radiator and a flexible circuit board according to another embodiment of the present disclosure;

fig. 5 is a second schematic diagram illustrating the connection between the radiator and the flexible circuit board according to the embodiment of the present application;

FIG. 6 is an exploded view of the structure of FIG. 5;

FIG. 7 is a schematic structural diagram of an electronic device in an embodiment of the present application;

FIG. 8 is a second schematic view illustrating the connection between the display module and the flexible printed circuit board according to the embodiment of the present invention;

fig. 9 is a graph comparing frequency versus gain curves for an antenna in an electronic device.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present disclosure.

Referring to fig. 1 to 8, an electronic device provided in an embodiment of the present application includes: the antenna unit includes a radiator 200 and a Flexible Printed Circuit (FPC) 300, wherein the radiator 200 is disposed on the display module 100;

the flexible circuit board 300 includes a first feeder line 301, a filter 302, a second feeder line 303, an insulating dielectric plate 304 and a first floor 305, the first floor 305 and the insulating dielectric plate 304 are stacked, the first feeder line 301, the filter 302 and the second feeder line 303 are respectively laid on the insulating dielectric plate 304, and the first feeder line 301, the filter 302 and the second feeder line 303 are respectively spaced from the first floor 305;

the circuit board is electrically connected to a first end of the filter 302 through the first feed line 301, and a second end of the filter 302 is electrically connected to the radiator 200 through the second feed line 303.

The radiator 200 may refer to an antenna of an antenna unit, wherein the antenna may be a transparent millimeter wave antenna, and specifically, an antenna form such as an iron sheet antenna, a dipole antenna, a yagi antenna, or a slot antenna may be used as the antenna in the antenna unit.

The radiator 200 may be attached to a clearance area of the display module 100, for example, the radiator 200 may be attached to an Optical Clear Adhesive (OCA) layer of the display module 100, that is, the clearance area may be formed on the OCA layer.

The insulating dielectric plate 304 may be made of a material with low dielectric loss, for example, the insulating dielectric plate 304 may be made of an industrial Liquid Crystal Polymer (LCP) material, so that loss of radio frequency signals on a signal transmission line may be effectively reduced.

The first feed line 301 and the second feed line 303 may be microstrip feed lines, and accordingly, the filter 302 may be a microstrip filter, for example, a parallel coupled line filter, an edge coupled line filter, or the like. The first feed line 301, the second feed line 303 and the filter 302 may be directly printed on the insulating dielectric board 304. And the first feeder line 301, the filter 302, and the second feeder line 303 may be sequentially connected along the length direction of the insulating dielectric slab 304, so that the filter 302 may serve as an antenna trace between the first feeder line 301 and the second feeder line 303, and thus, the length of the trace in the signal transmission line may be reduced, thereby further reducing the loss in the trace in the radio frequency signal transmission process.

Specifically, referring to fig. 3, in the process of radiating signals through the antenna unit, radio frequency signals may first enter the first feed line 301, then pass through the filter 302 for filtering, and then enter the radiator 200 through the second feed line 303 for radiation.

Specifically, the first floor 305 may employ a metal conductive plate, and the first floor 305 may form a metal ground of the flexible circuit board 300. The above-mentioned first feeder line 301, the filter 302 and the second feeder line 303 being spaced opposite to the first floor 305, respectively, may refer to: the first feeder line 301, the filter 302, and the second feeder line 303 are respectively spaced from the first floor 305 by the insulating dielectric plate 304, and then, the first feeder line 301, the filter 302, and the second feeder line 303 may also be respectively spaced from the first floor 305 to respectively space the first feeder line 301, the filter 302, and the second feeder line 303 from the first floor 305. That is, the first floor 305 is relatively insulated from any one of the first feeder line 301, the filter 302, and the second feeder line 303.

Referring to fig. 3, the shape of the first floor 305 may be the same as the shape of the insulating dielectric sheet 304, and the first floor and the insulating dielectric sheet may be aligned.

In this embodiment, the filter 302 is connected to the first feed line 301 and the second feed line 303 to integrate the filter 302 with the signal transmission line of the antenna, so that compared with a method of using the surface-mounted filter 302 in the prior art, the filtering function of the signal transmission line of the antenna can be realized without adding a solder joint, thereby reducing the loss of the radio frequency signal in the transmission process. In addition, since the first feeder line 301 and the second feeder line 303 are connected by the filter 302, that is, the filter 302 can be used as a trace between the first feeder line 301 and the second feeder line 303, the length of the trace in the signal transmission line can be reduced, thereby further reducing the loss in the trace during the transmission of the radio frequency signal. Therefore, the problem that the signal transmission effect of the antenna of the existing electronic equipment is poor can be solved.

Optionally, a first gap 3051 is formed in the surface of the first floor 305 and arranged along the length direction of the first floor 305, and one end of the first gap 3051 extends to the edge of the first floor 305;

the second feeder line 303 comprises a first sub-feeder line 3031 and a second sub-feeder line 3032, the first sub-feeder line 3031 is located in the first slot 3051, and a gap is formed between the first sub-feeder line 3031 and two opposite side walls of the first slot 3051 to form a coplanar waveguide;

the second sub-feed line 3032 is laid on one side of the insulating dielectric slab 304, which faces away from the first floor 305, the first sub-feed line 3031 and the second sub-feed line 3032 are electrically connected through a via hole, and the first sub-feed line 3031 is electrically connected with the radiator 200.

The first sub-feeder line 3031 may be disposed in the first slot 3051 along the extending direction of the first slot 3051, and the first sub-feeder line 3031 is spaced apart from the inner wall of the first slot 3051, so that the first sub-feeder line 3031 is spaced apart from the first floor 305. The first sub-feed line 3031 may be electrically connected to the radiator 200, and the second sub-feed line 3032 may be electrically connected to the second end of the filter 302 by forming a via hole on the surface of the insulating dielectric board 304.

In this embodiment, the first slot 3051 is opened on the surface of the first floor 305, and the first sub-feeder 3031 is disposed in the first slot 3051, so that a coplanar waveguide is formed at the first slot 3051, thereby effectively reducing impedance discontinuity and further improving the effect of signal transmission.

Optionally, a width dimension of an end of the first slit 3051 extending to the edge of the first floor 305 is a first dimension, a width dimension of an end of the first slit 3051 opposite to the via hole is a second dimension, and the first dimension is greater than the second dimension.

Specifically, referring to fig. 3, a triangular notch may be formed at one end of the first slit 3051 at the edge of the first floor panel 305, and of course, a rectangular notch (not shown) may be formed at one end of the first slit 3051 at the edge of the first floor panel 305, so that the first size is larger than the second size. Therefore, an impedance transformation structure can be formed at the triangular groove, and a coplanar waveguide can be formed at the impedance transformation structure in the signal transmission process, so that impedance discontinuity is effectively reduced, and the signal transmission effect is further improved.

Optionally, referring to fig. 4, the flexible circuit board 300 further includes a second ground plate 306 and a third ground plate 307, and the first feeder line 301, the filter 302, the second feeder line 303, the second ground plate 306 and the third ground plate 307 are located on a side of the insulating dielectric plate 304 opposite to the first ground plate 305;

the second floor 306 and the third floor 307 are adjacently arranged and located at the edge area of the insulating dielectric slab 304, a second gap is formed between the second floor 306 and the third floor 307, the second feeder 303 penetrates through the second gap to be electrically connected with the radiator 200, and the second floor 306 and the third floor 307 are respectively electrically connected with the first floor 305 through via holes.

In which a via hole may be provided in an area of the insulating dielectric plate 304 opposite to the second ground plate 306 to achieve electrical connection between the second ground plate 306 and the first floor 305, and correspondingly, a via hole may be provided in an area of the insulating dielectric plate 304 opposite to the third floor 307 to achieve electrical connection between the third floor 307 and the first floor 305. Thus, the first floor 305, the second floor 306, and the third floor 307 may collectively form a metal ground of the flexible circuit board 300.

The second floor 306 and the third floor 307 may have the same structure, and the second floor 306 and the third floor 307 may be symmetrically disposed about the second feeder 303, and in addition, a cross-sectional area of an end of the second floor 306 close to the radiator 200 is smaller than or equal to a cross-sectional area of an end of the second floor 306 away from the radiator 200, and a cross-sectional area of an end of the third floor 307 close to the radiator 200 is smaller than or equal to a cross-sectional area of an end of the third floor 307 away from the radiator 200, for example, trapezoidal plate bodies, rectangular plate bodies, triangular plate bodies, and the like may be respectively adopted for the second floor 306 and the third floor 307. In this way, an impedance transformation structure can be formed between the second floor 306 and the third floor 307, and a coplanar waveguide can be formed at the impedance transformation structure during signal transmission, so that impedance discontinuity is effectively reduced, and the signal transmission effect is further improved.

In this embodiment, by providing the second floor board 306 and the third floor board 307, an impedance transformation structure can be formed between the second floor board 306 and the third floor board 307, thereby further improving the signal transmission effect. In addition, in this embodiment, the first feed line 301 and the second feed line 303 are respectively disposed on the side of the insulating dielectric board 304 opposite to the first floor 305, so that no via hole exists on the signal transmission line between the circuit board and the radiator 200, thereby reducing the impedance matching problem and the extra loss caused by the via hole (in high frequency, the loss of the via hole tends to be large).

Optionally, the filter 302 includes a microstrip line, and the length of the microstrip line is one quarter of the target wavelength.

The filter 302 may be a microstrip line filter including a microstrip line, and the microstrip line is used to perform filtering processing on the signal passing through the filter 302. The width of the microstrip line can be adjusted according to actual needs.

The target wavelength may be a wavelength of a signal that can smoothly pass through the filter 302, that is, a wavelength of a signal that needs to be retained after the filtering process is performed by the filter 302. In other words, the signal flowing into the first end of the filter 302 from the first feeding line 301, after being filtered by the filter 302, only the signal of the target wavelength can flow out from the second end of the filter 302, and the signal having the wavelength outside the target wavelength will be filtered.

Specifically, the most important function of the filter 302 is to allow signals in the desired operating frequency (in-band) to pass as far as possible, while suppressing signals in the undesired operating frequency band (out-of-band), wherein the signals in the desired operating frequency (in-band), i.e., the signals with the target wavelength, and the undesired operating frequency (in-band), i.e., the signals with the wavelength outside the target wavelength; in other words, the required operating frequency is a frequency corresponding to the target wavelength, and the undesired operating frequency band is a frequency range corresponding to the non-target wavelength. Therefore, it is necessary to form a transmission zero point, i.e., a path state, in a desired frequency band, so as to allow a signal to pass through as much as possible; meanwhile, a transmission pole is formed in an undesired frequency band, namely, an open circuit state is formed, and the signal is restrained from passing through as much as possible. On this basis, in the embodiment of the present application, by setting the length of the microstrip line to be a quarter of the target wavelength, when a signal of the target wavelength flows through the filter 302, that is, a signal within the desired operating frequency flows through the filter 302, the microstrip line corresponds to a path state at the desired operating frequency, that is, forms a transmission zero point (the transmission zero point of the filter 302 may be analogized to a resonance point of the antenna). Accordingly, when a signal with a non-target wavelength flows through the filter 302, that is, a signal in an undesired operating band flows through the filter 302, the microstrip line is in an open circuit state at the undesired operating band, so that a function of filtering the signal flowing through the filter 302 can be realized.

Optionally, the filter 302 includes at least two microstrip lines, where the microstrip lines are U-shaped microstrip lines, the at least two microstrip lines are arranged at intervals along the length direction of the insulating dielectric slab 304, an opening of the microstrip line faces a first side edge of the insulating dielectric slab 304, the first side edge is a side edge of the insulating dielectric slab 304 in the width direction, and openings of any two adjacent microstrip lines of the at least two microstrip lines face opposite directions;

the at least two microstrip lines include a first microstrip line and a second microstrip line, the first feed line 301 is electrically connected to the first microstrip line, and the second feed line 303 is electrically connected to the second microstrip line, where the first microstrip line is a microstrip line of the at least two microstrip lines that is closest to the circuit board along the length direction of the first floor 305; the second microstrip line is a microstrip line closest to the radiator 200 in the length direction of the first floor 305, among the at least two microstrip lines.

Specifically, referring to fig. 3, at least two U-shaped microstrip lines are coupled by a slot, which is equivalent to at least two transmission zeros cascaded, so that at least two transmission zeros can be formed in the filter 302, and the operating frequency of the filter 302 can be significantly extended, thereby increasing the bandwidth of the filter 302.

Referring to fig. 3, the third-order hairpin filter structure adopted in this embodiment is formed by three U-shaped microstrip resonance structures (the U-shaped microstrip structures may have the same size or different sizes), and in practice, filtering structures such as a fourth-order filtering structure and a fifth-order filtering structure may be used as needed, which is not limited in this application. The hairpin-line microstrip filter structure adopted in the embodiment is only one scheme in the application, and other filter structures mainly composed of microstrip lines, such as a Uniform Impedance Resonance (UIR) filter, a Stepped Impedance Resonance (SIR) filter and the like, are also within the protection scope of the application. For the microstrip transmission line structure, the main function is to connect the millimeter wave filter antenna and the Radio Frequency Integrated Circuit (RFIC)308, so as to achieve normal operation of the whole millimeter wave radio frequency system.

In an embodiment of the present application, the lengths of the at least two microstrip lines are different, and the lengths of the different microstrip lines are respectively one quarter of different target wavelengths. In this way, at least two different transmission zeros corresponding to at least two microstrip lines one to one may be formed in the filter 302, thereby effectively increasing the bandwidth of the filter 302.

In addition, referring to fig. 5 to 6, in another embodiment of the present application, the filter 302 includes at least two microstrip lines, where the at least two microstrip lines are respectively disposed along a length direction of the insulating dielectric slab 304, and any two adjacent microstrip lines of the at least two microstrip lines are coupled and connected;

the at least two microstrip lines include a third microstrip line and a fourth microstrip line, the first feeder line 301 is coupled with the third microstrip line, and the second feeder line 303 is coupled with the fourth microstrip line, where the third microstrip line is a microstrip line closest to the circuit board along the length direction of the first floor 305 in the at least two microstrip lines; the fourth microstrip line is a microstrip line closest to the radiator 200 in the length direction of the first floor 305, among the at least two microstrip lines.

This embodiment differs from the above-described embodiment in that the structure of the microstrip line is strip-shaped.

Referring to fig. 5 to 6, the at least two microstrip lines are respectively disposed along a length direction of the insulating dielectric slab 304, and a region opposite to any two adjacent microstrip lines of the at least two microstrip lines exists between any two adjacent microstrip lines, so as to implement a coupling connection between any two adjacent microstrip lines.

In this embodiment, the first feeder line 301 is coupled to the third microstrip line, the second feeder line 303 is coupled to the fourth microstrip line, and any two adjacent microstrip lines are coupled to each other, so that at least two transmission zeros are cascaded, that is, at least two transmission zeros are formed in the filter 302, and the operating frequency of the filter 302 is significantly expanded, thereby increasing the bandwidth of the filter 302.

Optionally, referring to fig. 8, the antenna unit further includes a radio frequency integrated circuit 308, where the radio frequency integrated circuit 308 is disposed on the flexible circuit board 300;

the circuit board is electrically connected with the input end of the radio frequency integrated circuit 308 through the flexible circuit board 300, and the output end of the radio frequency integrated circuit 308 is electrically connected with the first feeder line 301.

Specifically, the rf integrated circuit 308 may be used as a feed source of the radiator 200, and the radiator 200 is fed through the rf integrated circuit 308. In addition, the rf integrated circuit 308 can be further fabricated on the insulating dielectric plate 304 of the flexible circuit board 300, so as to further improve the utilization rate of the flexible circuit board 300, and meanwhile, the problem that the rf integrated circuit 308 occupies the internal space of the screen of the electronic device due to being fabricated on the display module 100 can be avoided.

Optionally, the electronic device further includes a touch circuit 700 and a display circuit 600, the touch circuit 700 and the display circuit 600 are electrically connected to the circuit board through the flexible circuit board 300, the touch circuit 700 may be a touch IC in the electronic device, and the display circuit 600 may be a screen IC in the electronic device.

Specifically, the flexible circuit board 300 may be electrically connected to a circuit board through a connector 500. In this way, the touch circuit 700, the display circuit 600 and the rf integrated circuit 308 can be electrically connected to the circuit board through the same flexible circuit board 300 and the connector 500, respectively, so as to realize multiplexing of the flexible circuit board 300 and the connector 500. Compared with the prior art in which connection between different devices and circuit boards is realized through different lines, the internal space of the electronic equipment which needs to be occupied can be effectively reduced, and the internal space of the electronic equipment is saved.

Referring to fig. 1, the display module 100 may further include an ITO layer 400, where the ITO layer 400 may be used as a ground layer of an antenna unit, and specifically, the ITO ground may be connected to the first floor 305 to achieve conduction between the antenna ground and the metal ground of the flexible circuit board 300.

Please refer to fig. 9, which is a comparison graph of frequency-gain curves of an antenna in an electronic device obtained by testing an electronic device provided in an embodiment of the present application and an electronic device in the prior art based on the present application, wherein an abscissa is frequency, an ordinate is gain, an area between two outermost dotted lines is gain of an operating frequency band of an on-screen antenna, and a curve a is a frequency-gain curve of an on-screen antenna without a filter 302 in the prior art; curve b is the frequency-gain curve of the on-screen antenna in the embodiment of the present application; curve c is the frequency-gain curve for a prior art on-screen antenna with filter 302. Therefore, compared with the prior art, the electronic equipment provided by the embodiment of the application can obtain better frequency selection characteristics, namely the gain of the antenna is basically kept consistent in the working frequency band, and the gain of the antenna is obviously reduced in the non-working frequency band of the antenna, so that various interferences of the non-working area of the antenna are inhibited, and the anti-interference capability of the whole system is improved.

The electronic equipment can be intelligent glasses, VR equipment, intelligent wearing equipment such as AR equipment, and also can be mobile terminal equipment such as the thing networking, intelligent house, car, cell-phone. In the embodiment of the application, the antenna unit of the electronic device not only has conformal and hidden characteristics, but also can greatly expand the design space of the antenna, thereby improving the user experience of the product and the competitiveness of the product.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling an electronic device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present application.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An electronic device, comprising: the antenna comprises a display module (100), a circuit board and an antenna unit, wherein the antenna unit comprises a radiating body (200) and a flexible circuit board (300), and the radiating body (200) is arranged in the display module (100);

the flexible circuit board (300) comprises a first feeder line (301), a filter (302), a second feeder line (303), a first floor (305) and an insulating dielectric slab (304), wherein the first floor (305) and the insulating dielectric slab (304) are arranged in a stacked mode, the first feeder line (301), the filter (302) and the second feeder line (303) are respectively laid on the insulating dielectric slab (304), and the first feeder line (301), the filter (302) and the second feeder line (303) are respectively spaced from the first floor (305) in an opposite mode;

the circuit board is electrically connected with a first end of the filter (302) through the first feed line (301), and a second end of the filter (302) is electrically connected with the radiator (200) through the second feed line (303).

2. An electronic device according to claim 1, characterized in that the filter (302) comprises a microstrip line having a length of one quarter of a target wavelength.

3. The electronic device according to claim 2, wherein the filter (302) comprises at least two microstrip lines, the microstrip lines are U-shaped microstrip lines, the at least two microstrip lines are arranged at intervals along a length direction of the insulating dielectric slab (304), an opening of each microstrip line faces a first side of the insulating dielectric slab (304), the first side is a side of the insulating dielectric slab (304) in a width direction, and openings of any two adjacent microstrip lines of the at least two microstrip lines face opposite directions;

the at least two microstrip lines comprise a first microstrip line and a second microstrip line, the first feeder line (301) is electrically connected with the first microstrip line, and the second feeder line (303) is electrically connected with the second microstrip line.

4. The electronic device according to claim 2, wherein the filter (302) comprises at least two microstrip lines, the at least two microstrip lines are respectively arranged along a length direction of the insulating dielectric slab (304), and any two adjacent microstrip lines of the at least two microstrip lines are coupled;

the at least two microstrip lines comprise a third microstrip line and a fourth microstrip line, the first feeder line (301) is coupled with the third microstrip line, and the second feeder line (303) is coupled with the fourth microstrip line.

5. The electronic device according to claim 3 or 4, wherein the lengths of the at least two microstrip lines are different, and the lengths of the different microstrip lines are respectively one quarter of different target wavelengths.

6. The electronic device according to claim 1, wherein a first slit (3051) is formed on a surface of the first floor (305) and arranged along a length direction of the first floor (305), and one end of the first slit (3051) extends to an edge of the first floor (305);

the second feeder line (303) comprises a first sub feeder line (3031) and a second sub feeder line (3032), the first sub feeder line (3031) is positioned in the first gap (3051), and a gap is arranged between the first sub feeder line (3031) and two opposite side walls of the first gap (3051) to form a coplanar waveguide;

the second sub-feeder (3032) is arranged on one side, back to the first floor (305), of the insulating dielectric slab (304), the first sub-feeder (3031) and the second sub-feeder (3032) are electrically connected through a through hole, and the first sub-feeder (3031) is electrically connected with the radiator (200).

7. The electronic device of claim 6, wherein a width dimension of an end of the first slot (3051) extending to an edge of the first floor (305) is a first dimension, a width dimension of an end of the first slot (3051) opposite the via is a second dimension, and the first dimension is greater than the second dimension.

8. The electronic device according to claim 1, wherein the flexible circuit board (300) further comprises a second floor (306) and a third floor (307), the first feed line (301), the filter (302), the second feed line (303), the second floor (306) and the third floor (307) being located on a side of the insulating dielectric plate (304) facing away from the first floor (305);

the second floor (306) and the third floor (307) are adjacently arranged and located at the edge area of the insulating dielectric slab (304), a second gap is formed between the second floor (306) and the third floor (307), the second feeder line (303) penetrates through the second gap to be electrically connected with the radiator (200), and the second floor (306) and the third floor (307) are respectively electrically connected with the first floor (305) through via holes.

9. The electronic device of claim 1, wherein the antenna unit further comprises a radio frequency integrated circuit (308), the radio frequency integrated circuit (308) being disposed on the flexible circuit board (300);

the circuit board is electrically connected with the input end of the radio frequency integrated circuit (308) through the flexible circuit board (300), and the output end of the radio frequency integrated circuit (308) is electrically connected with the first feeder line (301).

10. The electronic device of claim 1, further comprising a touch circuit (700) and a display circuit (600), wherein the touch circuit (700) and the display circuit (600) are electrically connected to the circuit board through the flexible circuit board (300), respectively.