Folded waveguide resonant cavity antenna and electronic device

Abstract

The present application provides a folded waveguide resonant cavity antenna and an electronic device, wherein the folded waveguide resonant cavity antenna comprises a folded waveguide resonant cavity and a feeding structure, wherein the folded waveguide resonant cavity comprises a resonant cavity formed by enclosing a metal structure and a metal partition arranged in the resonant cavity, wherein the metal structure has a slit connected to the resonant cavity; the metal partition has a first side edge and a second side edge adjacent to each other, and a slotted gap is provided between the first side edge and the second side edge and the inner wall of the resonant cavity, and the other sides of the metal partition except the first side edge and the second side edge are fitted and connected to the inner wall of the resonant cavity to divide the resonant cavity into a first cavity and a second cavity, and the first cavity and the second cavity are connected through the slotted gap.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a waveguide resonant cavity antenna and electronic equipment. Background Art

[0002] As we all know, waveguide cavity resonator (WCR) is a typical resonant structure based on a fully enclosed metal cavity. Due to its low loss, high quality factor, good frequency selection characteristics and anti-interference performance, WCR is widely used in radio frequency communication systems.

[0003] At present, rectangular waveguide resonant cavities and cylindrical waveguide resonant cavities are usually used in electronic devices. Compared with patch antennas, inverted-F antennas (IFA) and planar inverted-F antennas (PIFA), WCR antennas still have larger sizes, which is not conducive to the application of miniaturized electronic products. Summary of the invention

[0004] The embodiments of the present application provide a folded waveguide resonant cavity antenna and an electronic device to solve the problem of the large volume of the waveguide resonant cavity antenna.

[0005] In the first aspect, an embodiment of the present application provides a folded waveguide resonant cavity antenna, which includes a folded waveguide resonant cavity and a feeding structure, wherein the folded waveguide resonant cavity includes a resonant cavity formed by an enclosure of a metal structure and a metal partition arranged in the resonant cavity, wherein the metal structure has a slit connected to the resonant cavity; the metal partition has a first side and a second side adjacent to each other, and the first side and the second side both have a slotted gap with the inner wall of the resonant cavity, and the other sides of the metal partition except the first side and the second side are fitted and connected to the inner wall of the resonant cavity to divide the resonant cavity into a first cavity and a second cavity, and the first cavity and the second cavity are connected through the slotted gap.

[0006] In the second aspect, an embodiment of the present application further provides an electronic device, which includes a folded waveguide resonant cavity antenna, the folded waveguide resonant cavity antenna including a folded waveguide resonant cavity and a feeding structure, the folded waveguide resonant cavity including a resonant cavity formed by an enclosure of a metal structure and a metal partition arranged in the resonant cavity, wherein the metal structure has a slit connected to the resonant cavity; the metal partition has a first side and a second side adjacent to each other, the first side and the second side both having a slotted gap with the inner wall of the resonant cavity, the other sides of the metal partition except the first side and the second side are fittedly connected to the inner wall of the resonant cavity to divide the resonant cavity into a first cavity and a second cavity, and the first cavity and the second cavity are connected through the slotted gap.

[0007] In the embodiment of the present application, a folded waveguide resonant cavity antenna is provided, which includes a folded waveguide resonant cavity and a feeding structure. The folded waveguide resonant cavity includes a resonant cavity formed by a metal structure and a metal partition provided in the resonant cavity, wherein the metal structure has a slit connected to the resonant cavity; the metal partition has a first side and a second side adjacent to each other, and the first side and the second side have a slotted gap between the inner wall of the metal partition, and the other sides of the metal partition except the first side and the second side are fitted and connected to the inner wall of the resonant cavity to divide the resonant cavity into a first cavity and a second cavity, and the first cavity and the second cavity are connected through the slotted gap. In this way, since the WCR itself is not sensitive to height, by providing a metal partition, the electric field is three-dimensionally flipped inside the folded waveguide resonant cavity, and the height of the single-layer resonant cavity can still be compressed, so that the total height of the resonant cavity remains unchanged. Therefore, the embodiment of the present application can reduce the volume of the antenna, and thus reduce the volume of the electronic device used.

[0008] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0010] Figure 1 It is one of the structural diagrams of the folded waveguide resonant cavity in the folded waveguide resonant cavity antenna provided in the embodiment of the present application;

[0011] Figure 2 It is one of the structural diagrams of the folded waveguide resonant cavity antenna provided in an embodiment of the present application;

[0012] Figure 3 This is the second structural diagram of the folded waveguide resonant cavity antenna provided in an embodiment of the present application;

[0013] Figure 4 This is the third structural diagram of the folded waveguide resonant cavity antenna provided in the embodiment of the present application;

[0014] Figure 5 This is the fourth structural diagram of the folded waveguide resonant cavity antenna provided in an embodiment of the present application;

[0015] Figure 6 This is the fifth structural diagram of the folded waveguide resonant cavity antenna provided in the embodiment of the present application;

[0016] Figure 7 This is the sixth structural diagram of the folded waveguide resonant cavity antenna provided in the embodiment of the present application;

[0017] Figure 8 This is the second structural diagram of the folded waveguide resonant cavity in the folded waveguide resonant cavity antenna provided in an embodiment of the present application;

[0018] Fig. 9 This is the third structural diagram of the folded waveguide resonant cavity in the folded waveguide resonant cavity antenna provided in an embodiment of the present application;

[0019] Fig.10 This is the fourth structural diagram of the folded waveguide resonant cavity in the folded waveguide resonant cavity antenna provided in an embodiment of the present application;

[0020] Fig.11 This is the fifth structural diagram of the folded waveguide resonant cavity in the folded waveguide resonant cavity antenna provided in the embodiment of the present application;

[0021] Fig.12 is an exploded structural diagram of a folded waveguide resonant cavity in a folded waveguide resonant cavity antenna provided in an embodiment of the present application;

[0022] Fig.13 is a right side view of the folded waveguide resonant cavity in the folded waveguide resonant cavity antenna provided in an embodiment of the present application;

[0023] Fig.14 is a bottom view of a folded waveguide resonant cavity in a folded waveguide resonant cavity antenna provided in an embodiment of the present application;

[0024] Fig.15 This is the seventh structural diagram of the folded waveguide resonant cavity antenna provided in the embodiment of the present application;

[0025] Fig.16 This is a comparison diagram of radiation effects corresponding to the cut-angle structures of different sizes in the folded waveguide resonant cavity antenna provided in an embodiment of the present application;

[0026] Fig.17This is the sixth structural diagram of the folded waveguide resonant cavity in the folded waveguide resonant cavity antenna provided in an embodiment of the present application;

[0027] Fig.18 is a schematic cross-sectional structure diagram of a folded waveguide resonant cavity in a folded waveguide resonant cavity antenna provided in an embodiment of the present application;

[0028] Fig.19 This is the seventh structural diagram of the folded waveguide resonant cavity in the folded waveguide resonant cavity antenna provided in the embodiment of the present application;

[0029] Fig. 20 This is the eighth structural diagram of the folded waveguide resonant cavity in the folded waveguide resonant cavity antenna provided in the embodiment of the present application;

[0030] Fig.21 This is the ninth structural diagram of the folded waveguide resonant cavity in the folded waveguide resonant cavity antenna provided in an embodiment of the present application;

[0031] Fig. 22 This is the tenth structural diagram of the folded waveguide resonant cavity in the folded waveguide resonant cavity antenna provided in an embodiment of the present application;

[0032] Fig.23 is a structural diagram of an electronic device provided in an embodiment of the present application;

[0033] Figures 24 to 39 This is a radiation effect diagram of the folded waveguide resonant cavity antenna provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0035] The term "first" or "second" in the specification and claims of the present application may include one or more of the features explicitly or implicitly. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0036] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] See also Figures 1 to 14 The embodiment of the present application provides a folded waveguide resonant cavity antenna, including a folded waveguide resonant cavity 1 and a feeding structure 40, wherein the folded waveguide resonant cavity 1 includes a resonant cavity 10 formed by a metal structure and a metal partition 20 arranged in the resonant cavity 10, wherein the metal structure has a slit 101 connected to the resonant cavity 10; the metal partition 20 has a first side 201 and a second side 202 adjacent to each other, and the first side 201 and the second side 202 have a slot gap between the inner wall of the resonant cavity 10, and the other sides of the metal partition 20 except the first side 201 and the second side 202 are fitted and connected to the inner wall of the resonant cavity 10 to divide the resonant cavity 10 into a first cavity 102 and a second cavity 103, and the first cavity 102 and the second cavity 103 are connected through the slot gap 104.

[0039] In order to better understand this application, Figure 1 The three-dimensional coordinate system shown in FIG. 1 is a three-dimensional coordinate system in which the Z-axis direction is the up-down direction, the X-axis direction is the left-right direction, and the Y-axis direction is the front-back direction. Figure 1 In the figure, the first side edge 201 can be understood as the right side edge of the metal partition 20, and the second side edge 202 can be understood as the front side edge of the metal partition.

[0040] In the embodiment of the present application, the structure of the resonant chamber 10 can be set according to actual needs. For example, in some embodiments, the resonant chamber 10 is a rectangular cavity or a fan-shaped cavity. The structure of the metal partition 20 is similar to that of the resonant chamber 10. For example, when the resonant chamber 10 is a rectangular cavity, the metal partition 20 is a rectangular metal partition; when the resonant chamber 10 is a fan-shaped cavity, the metal partition 20 is a fan-shaped metal partition. The other sides of the metal partition 20 except the first side 201 and the second side 202 are connected to the inner wall of the resonant chamber 10. It can be understood that the other sides of the metal partition 20 are connected to the metal structure used to enclose the resonant chamber 10. At this time, the other sides of the metal partition 20 are conductively connected to the metal structure used to enclose the resonant chamber 10. When the metal partition 20 is a rectangular metal partition, the other sides may include a fourth side set back to the first side 201 and a third side set back to the second side. When the metal partition 20 is an arc-shaped metal partition, the other side can be understood as the arc-shaped side of the metal partition 20. In order to better understand the present application, the following embodiments are described in detail by taking the resonance chamber 10 as a rectangular cavity and the metal partition 20 as a rectangular metal partition as an example.

[0041] The first side 201 and the second side 202 both have a slotted gap between the inner wall of the metal partition 20, which can be understood as the first side 201 and the second side 202 both have an insulating gap between the inner wall of the metal partition 20. In some embodiments, the first side 201 of the metal partition 20 can also be connected to the inner wall of the resonance chamber 10 through other connecting structures to provide additional support for the metal partition 20.

[0042] The above-mentioned slits can be understood as slots formed in the parts where no metal is provided. The slits may be filled with or not filled with non-conductive medium.

[0043] It should be understood that for a classical rectangular waveguide resonant cavity, its side length is equal to the main mode (TE 110 mode), so when the resonant frequency is low, the waveguide resonant cavity usually has a larger outer size. In the embodiment of the present application, after the metal partition 20 is set in the resonant cavity 10, the resonant cavity 10 can be called a folded waveguide resonator antenna (FWRA). Due to the setting of the metal partition 20, the electric field can be three-dimensionally flipped inside the resonant cavity 10. In comparison, the folded waveguide resonant cavity can reduce the side length to 50% of the original without changing its original resonant frequency, that is, the main mode (TE 110 half the wavelength corresponding to the mode Therefore, the folded waveguide resonant cavity in the folded waveguide resonant cavity antenna provided in the embodiment of the present application is 75% smaller than the classic rectangular waveguide resonant cavity.

[0044] Optionally, the feeding structure 40 includes a feeding connection line and a grounding connection line, the feeding connection line is connected to a feeding point of the metal partition, and the grounding connection line is electrically connected to the metal structure.

[0045] In an embodiment of the present application, a folded waveguide resonant cavity antenna includes a folded waveguide resonant cavity 1 and a feeding structure 40, wherein the folded waveguide resonant cavity 1 includes a resonant cavity 10 formed by a metal structure and a metal partition 20 arranged in the resonant cavity 10, wherein the metal structure has a slit 101 connected to the resonant cavity 10; the metal partition 20 has a first side 201 and a second side 202 adjacent to each other, and the first side 201 and the second side 202 both have a slot gap between the inner wall of the resonant cavity 10, and the other sides of the metal partition 20 except the first side 201 and the second side 202 are fitted and connected to the inner wall of the resonant cavity 10 to divide the resonant cavity 10 into a first cavity and a second cavity, and the first cavity and the second cavity are connected through the slot gap; the feeding structure 40 includes a feeding connection line and a grounding connection line, the feeding connection line is connected to the feeding point of the metal partition, and the grounding connection line is electrically connected to the metal structure. In this way, since the WCR itself is not sensitive to height, by providing the metal partition 20, the electric field is three-dimensionally flipped inside the folded waveguide resonant cavity 1, and the height of the single-layer resonant cavity can still be compressed, and finally the total height of the resonant cavity remains unchanged. Therefore, the embodiment of the present application can reduce the volume of the antenna, and then reduce the volume of the applied electronic device.

[0046] It should be understood that the specific structural form of the above-mentioned metal structure can be set according to actual needs. For example, in some embodiments, the metal structure is a plurality of metal plates.

[0047] In the embodiment of the present application, six metal plates can be used to enclose the above-mentioned resonant chamber 10, which has a simple structure and is convenient for industrial production and application. The six metal plates are respectively located at six positions: front, back, left, rear, top, and bottom. It should be understood that the metal plates can be fixed by welding or by other methods.

[0048] The location of the slit 101 can be understood as the radiation location of the folded waveguide resonant cavity 1. Specifically, different forms of slits 101 can be provided according to actual needs. For example, the slit 101 is formed on at least one of the metal plates.

[0049] like Figures 2 to 4As shown, a slit 101 may be provided on the top metal plate; Figure 5 As shown, a slit 101 may be provided on the metal plate on the side; Figure 6 and Figure 7 As shown, interconnected slits 101 may also be formed on the top and side metal plates. Figure 7 In the embodiment, the slit 101 can be formed by cutting grooves on the metal plates at the top and the side, or the slit 101 can be formed by moving the two metal plates at the side outwards by a certain distance.

[0050] It should be noted that the above metal plate can also be referred to as the metal surface of the folded waveguide resonant cavity. Different slotting methods of the folded waveguide resonant cavity antenna have different corresponding radiation areas, for example Figures 24 to 39 Different radiation areas corresponding to various slotting methods are shown. Among them, the filled area represents the radiation area, that is, the slotting area of ​​the slot 101. Optionally, the folded waveguide resonant cavity antenna in the embodiment of the present application can radiate through the metal surface of the folded waveguide resonant cavity (such as Fig.11 As shown), due to the main mode of the resonant cavity (TE 110 The electric field distribution of the mode) is uneven. When the opening area of ​​the metal surface (i.e., the opening area of ​​the slit 101) is located at or close to Figures 24 to 39 In the strong electric field region shown, the overall efficiency of the FWRA is higher.

[0051] It should be understood that the radiation area of ​​FWRA includes but is not limited to Figures 24 to 39 The number, position and shape shown. Generally, increasing the area and number of metal surface openings helps to improve the overall efficiency of the FWRA. When the FWRA adopts a radiation form with a single metal surface opening, the radiation area should be selected as far as possible at a strong electric field and a larger opening area should be ensured. When the FWRA adopts a radiation form with upper and lower or multiple metal surfaces opening at the same time, the overall efficiency of the FWRA is higher than that of a single metal surface opening.

[0052] Alternatively, if Figures 8 to 11 As shown, the above-mentioned feeding structure may include a coaxial cable (such as Figure 8 and Fig.10 As shown), flexible circuit board (such as Fig. 9 and Fig.11 As shown in the figure, or a connector based on a coaxial cable. Specifically, the folded waveguide resonant cavity can be fed from the side surface or the upper and lower surfaces according to the needs of the application scenario.

[0053] like Fig.12As shown, in some embodiments, when the resonant chamber 10 is a rectangular cavity, the metal structure includes a first metal plate 301, a second metal plate 302, a third metal plate 303, a fourth metal plate 304, a fifth metal plate 305 and a sixth metal plate 306, wherein the first metal plate 301, the second metal plate 302, the third metal plate 303 and the fourth metal plate 304 are side plates connected end to end in sequence, the fifth metal plate 305 is a bottom plate, the sixth metal plate 306 is a top plate, the metal partition plate 20 is located between the fifth metal plate 305 and the sixth metal plate 306, and is respectively connected to the first metal plate 301 and the second metal plate 302, there is a gap between the first side 201 and the third metal plate 303, and there is a gap between the second side 202 and the fourth metal plate 304; the ground connection line is electrically connected to the third metal plate 303, the fourth metal plate 304, the fifth metal plate 305 or the sixth metal plate 306.

[0054] In the embodiment of the present application, when the ground connection line is connected to the third metal plate 303 or the fourth metal plate 304, it can be understood that power is fed from the side surface of the resonant chamber 10. Fig.10 and 11 When the ground connection line is connected to the fifth metal plate 305 or the sixth metal plate 306, it can be understood that the upper and lower surfaces of the resonant chamber 10 are fed, as shown in FIG. Figure 8 and Fig. 9 shown.

[0055] Optionally, in some embodiments, the metal partition plate 20 , the fifth metal plate 305 and the sixth metal plate 306 are arranged parallel to each other. In the embodiment of the present application, the metal partition plate 20 may be located at one-half of the total height of the resonant chamber 10 .

[0056] It should be understood that since the main mode of the folded waveguide resonant cavity is TE 110 The mode has a high redundancy for the height of the resonant cavity 10. It is only necessary to keep the height of the single-layer resonant cavity above 5% of the side length of the folded waveguide resonant cavity. Excessive compression of the height is not conducive to exciting the main mode of the folded waveguide resonant cavity. For example, in other embodiments, according to different application scenarios, the position of the internal metal partition 20 in the Z-axis direction can be adjusted between 30% and 70% of the total height of the resonant cavity 10. When using the high-order mode (TE mnl，l≠0 or TM mnl，l≠0 ), depending on the mode, the height of the resonant cavity should satisfy the wavelength corresponding to the component of the mode in the Z-axis direction.

[0057] Optionally, when the ground connection line is connected to the third metal plate or the fourth metal plate, the vertical distance from the feeding point 203 to the third side of the metal partition 20 is within a target range, and the target range is 0.3 to 0.5 times the side length of the rectangular frame enclosed by the first metal plate 301, the second metal plate 302, the third metal plate 303 and the fourth metal plate 304, and the third side is arranged back to back with the second side.

[0058] Please refer to Fig.12 and Fig.13 In the embodiment of the present application, the side length of the rectangular frame enclosed by the first metal plate 301, the second metal plate 302, the third metal plate 303 and the fourth metal plate 304 can be understood as the side length of the folded waveguide resonant cavity. When feeding from the side surface, the vertical distance H1 from the feeding point 203 to the third side of the metal partition 20 is limited to between 30% and 50% of the side length of the folded waveguide resonant cavity, thereby avoiding the vertical distance being too large or too small to be unfavorable for exciting the main mode of the folded waveguide resonant cavity.

[0059] Optionally, in some embodiments, when the ground connection line is connected to the fifth metal plate 305 or the sixth metal plate 306, the vertical distance from the feeding point 203 to the third side of the metal partition 20 is within a target range, and the target range is 0.3 to 0.5 times the side length of the rectangular frame enclosed by the first metal plate 301, the second metal plate 302, the third metal plate 303 and the fourth metal plate 304, and the third side is arranged back to back with the second side; the vertical distance from the feeding point 203 to the first side of the metal partition 20 is less than or equal to the target threshold, and the target threshold is 0.2 times the side length of the rectangular frame enclosed by the first metal plate 301, the second metal plate 302, the third metal plate 303 and the fourth metal plate 304.

[0060] Please refer to Fig.12 and 14 As shown, in the embodiment of the present application, the side length of the rectangular frame enclosed by the first metal plate 301, the second metal plate 302, the third metal plate 303 and the fourth metal plate 304 can be understood as the side length of the folded waveguide resonant cavity. Since the vertical distance H1 from the feeding point 203 to the third side of the metal partition 20 is limited to between 30% and 50% of the side length of the folded waveguide resonant cavity when feeding from the side surface, it is possible to avoid the vertical distance being too large or too small, which is not conducive to exciting the main mode of the folded waveguide resonant cavity. In addition, the vertical distance H2 of the first side of the metal partition 20 is limited to within 20% of the side length of the folded waveguide resonant cavity, so that the feeding point 203 is as close as possible to the edge of the metal partition 20, which is conducive to exciting the main mode of the resonant cavity 10.

[0061] Alternatively, if Fig.15 As shown, in some embodiments, the metal structure portion is recessed into the first cavity to form a recessed portion 50 .

[0062] In the embodiment of the present application, other metal partitions can be used to divide the recessed portion 50 into an additional independent area. In this way, the corresponding device 60 can be nested in the recessed portion 50 according to the actual scene requirements. Since the independent areas formed are separated by metal partitions, the nested device 60 will not affect the folded waveguide resonant cavity antenna itself. For example, the nested device can be another FWRA with a higher operating frequency, or it can be an acoustic device (such as a speaker), an optical device (such as a camera), or a radio frequency circuit (such as a power amplifier circuit or a power amplifier). Therefore, the recessed portion 50 is provided, and other devices can be compositely nested, thereby further reducing the volume of the electronic device used. It should be understood that the composite nesting form of composite nesting of other devices can be set according to actual needs. For example, the position, quantity and specific type of nested other devices can be set according to actual needs, such as Fig.23 As shown, a composite nesting example is given, in which a camera 2301 is compositely nested in the recessed portion 50, and the camera 2301 is arranged at the lower right corner of the folded waveguide resonant cavity antenna.

[0063] Optionally, in some embodiments, a chamfer structure 204 is provided at the connection between the first side edge 201 and the second side edge 202 .

[0064] In the embodiment of the present application, the shape and size of the above-mentioned cut-angle structure 204 can be set according to actual needs. By setting the cut-angle structure 204, the operating frequency of the folded waveguide resonant cavity can be adjusted. In this way, by controlling the size of the cut-angle structure 204, the operating frequency of the resonant cavity can be optimized and adjusted without changing the shape and size of the resonant cavity. The effect produced by introducing the cut-angle structure 204 is as follows: Fig.16 As shown in FIG. 1 , the operating frequency of the resonant cavity will increase accordingly with the increase of the cut angle size. The size of the cut angle structure should be controlled within 60% of the side length of the folded waveguide resonant cavity 1. If it is too large, it will be unfavorable to excite the main mode (TE 110 Due to the provision of the chamfer structure, the first side 201 and the second side 202 are connected by the chamfer structure, wherein the size of the chamfer structure can be understood as: the length of the chamfer side between the first connection point between the chamfer structure and the first side 201 and the second connection point between the chamfer structure and the second side 202. Fig.16 As shown, the length of the cut corner side is the distance between the first connection point and the second connection point.

[0065] Furthermore, in some embodiments, the folded waveguide resonant cavity is filled with a dielectric material. The dielectric material can be understood as a non-conductive dielectric material. Assuming that the dielectric constant is ε r , the magnetic permeability is μ r When the dielectric material is filled, the volume of the resonant cavity 10 can be further reduced. At this time, the side length of the folded waveguide resonant cavity will be reduced from Reduce to λ is the wavelength of electromagnetic waves in a vacuum environment.

[0066] Alternatively, if Figure 17 to Figure 18 As shown, in some embodiments, the folded waveguide resonant cavity antenna includes a first conductor layer 701, a first dielectric layer 702, a second conductor layer 703, a second dielectric layer 704 and a third conductor layer 705 which are stacked in sequence; wherein, the first dielectric layer 702 is provided with a plurality of first conductive holes 7021, one end of the first conductive hole 7021 is electrically connected to the first conductor layer 701, and the other end is connected to the second conductor layer 703, the second dielectric layer 704 is provided with a plurality of second conductive holes 7041, one end of the second conductive hole 7041 is electrically connected to the second conductor layer 703, and the other end is connected to the third conductor layer 705, the first conductor layer 701, the plurality of first conductive holes 7021, the plurality of second conductive holes 7041 and the third conductor layer 705 form the metal structure, and a partial conductor region of the second conductor layer forms the metal partition 20.

[0067] In the embodiment of the present application, the folded waveguide resonant cavity antenna can be implemented by using a multi-layer circuit board or a low temperature co-fired ceramic structure. Among them, the first conductor layer 701, the second conductor layer 703 and the third conductor layer 705 are conductive layers of the multi-layer circuit board, and the first dielectric layer 702 and the second dielectric layer 704 are non-conductive dielectric layers of the multi-layer circuit board. The second conductor layer 703, except for the metal partition 20, at least the other conductor area is used to connect the multiple second conductive holes 7021 and the multiple second conductive holes 7041. In this way, the middle area enclosed by the multiple first conductive holes 7021, the multiple second conductive holes 7041 and the third conductor layer 705 can be understood as the above-mentioned resonant cavity 10.

[0068] Optionally, the multilayer circuit board may be a flexible printed circuit (FPC) or a printed circuit board (PCB).

[0069] Optionally, part of the first conductor layer 701 is used to form the metal structure, and part of the first conductor layer 701 forms the feeding structure, that is, the metal part corresponding to the sixth metal plate 306 is formed by the first conductor layer 701, and the feeding structure is formed by setting metal routing on the first conductor layer 701.

[0070] Furthermore, in the embodiment of the present application, power feeding can be achieved by adding additional metal wires and conductive holes. Figures 19 to 22 As shown. Fig.19 and Fig.21 As shown, a metal wire can be led out from the metal separator 20 in the second conductor layer 703, and then electrically connected to the metal wire by setting a conductive hole between the second conductor layer 703 and the first conductor layer 701, and finally connected to the metal wire by a coaxial cable (such as Fig.19 as shown) or FPC (as Fig.21 The feeding structure 40 formed by the power feeding structure 40 is used to realize the feeding. Fig. 20 and Fig. 22 As shown, a conductive hole is provided between the second conductor layer 703 and the first conductor layer 701 to electrically connect with the metal separator 20, and finally a coaxial cable (such as Fig. 20 as shown) or FPC (as Fig. 22 The feeding structure 40 constructed as shown in the figure realizes feeding.

[0071] In the embodiment of the present application, a folded waveguide resonant cavity antenna can be obtained by using low-cost PCB technology, which has high reliability and is convenient for industrial production applications.

[0072] Furthermore, an embodiment of the present application also provides an electronic device, which includes the folded waveguide resonant cavity antenna in the above embodiment. The structure of the folded waveguide resonant cavity antenna can refer to the description of the above embodiment, and will not be repeated here. Since the electronic device provided by the embodiment of the present application adopts the folded waveguide resonant cavity antenna in the above embodiment. Therefore, the electronic device in the embodiment of the present application has all the beneficial effects of the folded waveguide resonant cavity antenna in the above embodiment.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0074] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A folded waveguide resonant cavity antenna, characterized in that: The invention comprises a folded waveguide resonant cavity and a feeding structure, wherein the folded waveguide resonant cavity comprises a resonant cavity formed by a metal structure and a metal partition arranged in the resonant cavity, wherein the metal structure has a slit connected to the resonant cavity; the metal partition has a first side and a second side adjacent to each other, and a slot gap is formed between the first side and the second side and the inner wall of the resonant cavity; the other sides of the metal partition except the first side and the second side are fitted and connected to the inner wall of the resonant cavity to divide the resonant cavity into a first cavity and a second cavity, and the first cavity and the second cavity are connected through the slot gap; A cut-angle structure is provided at the connection between the first side and the second side, and the feeding structure includes a feeding connection line and a grounding connection line, the feeding connection line is connected to the feeding point of the metal partition, and the grounding connection line is electrically connected to the metal structure.

2. The folded waveguide resonant cavity antenna according to claim 1, characterized in that: The resonant chamber is a rectangular cavity or a fan-shaped cavity.

3. The folded waveguide resonant cavity antenna according to claim 1, characterized in that: The metal structure is a plurality of metal plates.

4. The folded waveguide resonant cavity antenna according to claim 3, when the folded waveguide resonant cavity is a rectangular cavity, the metal structure comprises a first metal plate, a second metal plate, a third metal plate, a fourth metal plate, a fifth metal plate and a sixth metal plate, wherein: The first metal plate, the second metal plate, the third metal plate and the fourth metal plate are side plates of the rectangular cavity, the fifth metal plate is the bottom plate, the sixth metal plate is the top plate, the metal partition is located between the fifth metal plate and the sixth metal plate, and is respectively connected to the first metal plate and the second metal plate, there is a slotted gap between the first side and the third metal plate, and there is a slotted gap between the second side and the fourth metal plate; the grounding connecting line of the feeding structure is electrically connected to the third metal plate, the fourth metal plate, the fifth metal plate or the sixth metal plate.

5. The folded waveguide resonant cavity antenna according to claim 4, characterized in that: When the ground connection line is connected to the third metal plate or the fourth metal plate, the vertical distance from the feeding point of the metal partition to the third side of the metal partition is within a target range, and the target range is 0.3 to 0.5 times the side length of the rectangular frame enclosed by the first metal plate, the second metal plate, the third metal plate and the fourth metal plate, and the third side is arranged back to back with the second side.

6. The folded waveguide resonant cavity antenna according to claim 4, characterized in that: When the grounding connection line is connected to the fifth metal plate or the sixth metal plate, the vertical distance from the feeding point of the metal partition to the third side of the metal partition is within the target range, which is 0.3 to 0.5 times the side length of the rectangular frame enclosed by the first metal plate, the second metal plate, the third metal plate and the fourth metal plate, and the third side is arranged back to back with the second side; the vertical distance from the feeding point to the first side of the metal partition is less than or equal to the target threshold, which is 0.2 times the side length of the rectangular frame enclosed by the first metal plate, the second metal plate, the third metal plate and the fourth metal plate.

7. The folded waveguide resonant cavity antenna according to claim 1, characterized in that: The metal structure portion is recessed into the first cavity to form a recessed portion.

8. The folded waveguide resonant cavity antenna according to claim 1, characterized in that: The folded waveguide resonant cavity antenna includes a first conductor layer, a first dielectric layer, a second conductor layer, a second dielectric layer and a third conductor layer which are stacked in sequence; wherein the first dielectric layer is provided with a plurality of first conductive holes, one end of the first conductive hole is electrically connected to the first conductor layer, and the other end is connected to the second conductor layer; the second dielectric layer is provided with a plurality of second conductive holes, one end of the second conductive hole is electrically connected to the second conductor layer, and the other end is connected to the third conductor layer; the first conductor layer, the plurality of first conductive holes, the plurality of second conductive holes and the third conductor layer form the metal structure, and a partial conductor region of the second conductor layer forms the metal partition.

9. The folded waveguide resonant cavity antenna according to any one of claims 1 to 8, characterized in that: The resonant cavity is filled with dielectric material.

10. An electronic device, characterized in that: The invention comprises the folded waveguide resonant cavity antenna as claimed in any one of claims 1 to 9.

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