Low-profile waveguide antenna array
By designing a cascaded power divider structure and connection components in a low-profile waveguide antenna array, the power divider extends forward and backward, solving the problem of large volume of the existing waveguide array, and achieving the reduction of the volume and performance improvement of the array.
Patent Information
- Application Number
- CN202411915131.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-03-28
AI Technical Summary
The existing waveguide arrays extend in multiple directions due to the cascade of the power divider, resulting in a large volume and it is difficult to control the volume of the array.
By designing a cascaded power divider structure in a low profile waveguide antenna array, the output port of the first mating member is tortuously connected to the input port of the second mating member by using a plurality of connection components, so that the plurality of first power dividers extend in one direction only in the front and back.
The height and volume of the waveguide antenna array are reduced, while improving the array performance and machining accuracy.
Smart Images
Figure CN119726155A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of antenna technology, and in particular to a low-profile waveguide antenna array. Background Art
[0002] Waveguide antennas are widely used in the field of radar detection due to their low loss, large power capacity, compact structure, easy processing and convenient separation. Low-profile broadband waveguide antenna arrays are an important application requirement for automotive radar.
[0003] The waveguide arrays currently used are mainly parallel-fed by cascading multiple one-to-two power splitters. The power splitter cascade is usually extended in two directions to complete the process, so there is a problem of large size.
[0004] Therefore, how to control the volume of the waveguide antenna array is an urgent problem to be solved by those skilled in the art. Summary of the invention
[0005] The main purpose of the present invention is to propose a low-profile waveguide antenna array, aiming to control the volume of the waveguide antenna array.
[0006] To achieve the above-mentioned purpose, the low-profile waveguide antenna array proposed in the present invention includes a cascaded power divider structure, and the cascaded power divider structure includes a plurality of first power dividers arranged at intervals along the front-to-back direction, and each of the first power dividers is provided with an input port facing the left side or the right side and two output ports orthogonal to the input port, and the input port is used to receive an input signal, and the output port is used to output an electromagnetic wave converted from the input signal; the two first power dividers cooperating with each other in the front-to-back direction are a first matching piece and a second matching piece, and the input port of the first matching piece and the input port of the second matching piece face opposite directions, and an output port in the first matching piece is connected to an input port in the second matching piece through a connecting component to transmit electromagnetic waves, and the other output port in the first matching piece is connected to a first radiating element to emit electromagnetic waves outward.
[0007] In one embodiment, the connecting component includes a first waveguide tube and two first waveguide elbows; the first waveguide tube extends in a front-to-rear direction; the two first waveguide elbows are respectively connected to the two ends of the first waveguide tube, and the two first waveguide elbows are connected to the output port of the first matching component and the input port of the second matching component.
[0008] In one embodiment, the first waveguide elbow has a first port and a second port, one of the first port and the second port is used to connect to the first waveguide tube, and the other is used to connect to the first matching piece or the second matching piece, and the electric field polarizations of the input port and the output port of the first waveguide elbow are perpendicular to each other.
[0009] In one embodiment, the plurality of first power dividers, the plurality of connection components, and the plurality of first radiation elements form a cascade power divider structure, and the plurality of cascade power divider structures are provided, and the plurality of cascade power divider structures are arranged in an array;
[0010] The low-profile waveguide antenna array also includes a parallel component, which includes a second power divider, a plurality of second waveguide elbows and a plurality of second waveguide elbows; the second power divider has an input port and a plurality of output ports, the input port of the second power divider is used to receive an input signal, and the plurality of output ports of the second power divider are respectively connected to the input ports of the first matching parts at the head end of the plurality of cascaded power divider structures; each of the plurality of second waveguide tubes extends in a front-to-back or up-and-down direction, and one end of the plurality of second waveguide tubes is respectively connected to the plurality of output ports of the second power divider; a plurality of second waveguide elbows, one end of each of the second waveguide elbows is connected to the other end of the second waveguide tube, and the other end of the plurality of waveguide elbows is connected to the input port of the cascaded power divider structure.
[0011] In one embodiment, the low-profile waveguide antenna array includes two cascaded power divider structures, the two cascaded power divider structures are arranged in a front-to-back interval, the front end and the rear end of the second power divider are respectively provided with output ports, the right end of the second power divider is provided with an input port, and the second waveguide tube extends in the front-to-back direction; the low-profile waveguide antenna array also includes a radiating component, the radiating component includes a third power divider, which is provided with a right-facing input port and multiple output ports, the input port of the third power divider is used to receive an input signal, and one of the multiple output ports of the third power divider is arranged to the left to be connected to the input port of the second power divider; the radiating component also includes one or more second radiating elements; a second radiating element is arranged between the two cascaded power divider structures, and the second radiating element is connected to other output ports of the third power divider; multiple second radiating elements are arranged between the two cascaded power divider structures, the multiple second radiating elements are respectively connected to multiple other output ports of the third power divider and the multiple second radiating elements are arranged in a front-to-back interval.
[0012] In one embodiment, the two cascaded power divider structures are symmetrically arranged along the axis of the third power divider input port.
[0013] In one embodiment, the first radiating element is configured as an open waveguide or a horn antenna, and / or the second radiating element is configured as an open waveguide or a horn antenna.
[0014] In one embodiment, one output port of the third power divider has the same polarization as the input port, and the remaining output ports have polarizations orthogonal to the input port.
[0015] In one embodiment, the first radiation element and the first power divider are fixedly connected via a connecting piece, a floating pin is provided on the connecting piece, and the floating pin penetrates into the first radiation element; and / or, the second radiation element and the third power divider are fixedly connected via a connecting piece, a floating pin is provided on the connecting piece, and the floating pin penetrates into the second radiation element; and / or, the second power divider and the second waveguide are fixedly connected via a connecting piece, a floating pin is provided on the connecting piece, and the floating pin penetrates into the second waveguide.
[0016] In one embodiment, the output port of the second matching piece at the end of the low-profile waveguide antenna array is connected to a third radiating element, and the third radiating element is configured as an open waveguide or a horn antenna.
[0017] The technical solution of the present invention sets the input ports of every two adjacent first power dividers in opposite directions, and uses multiple connecting components to connect the output port of the first matching component to the input port of the second matching component in a zigzag manner, so that the multiple first power dividers can only extend in one direction forward and backward, thereby reducing the height and volume of the waveguide antenna array. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0019] Figure 1 A schematic structural diagram of an embodiment of a low-profile waveguide antenna array provided by the present invention;
[0020] Figure 2 for Figure 1 Schematic diagram of the structure of the medium and low profile waveguide antenna array from top view;
[0021] Figure 3 A schematic top view of the structure of another embodiment provided by the present invention;
[0022] Figure 4 for Figure 1 Antenna H-plane radiation pattern of low- to medium-profile waveguide antenna array;
[0023] Figure 5 for Figure 1 Antenna E-plane radiation pattern of low- to medium-profile waveguide antenna array;
[0024] Figure 6for Figure 1 Antenna standing wave diagrams for low- to medium-profile waveguide antenna arrays.
[0025] Description of Figure Numbers:
[0026] 100. Low-profile waveguide antenna array; 1. Cascade power divider structure; 11. First power divider; 12. Connecting assembly; 121. First waveguide tube; 122. First waveguide elbow; 13. First radiating element; 14. Third radiating element; 2. Parallel assembly; 21. Second power divider; 22. Second waveguide tube; 23. Second waveguide elbow; 3. Radiating assembly; 31. Third power divider; 32. Second radiating element; 4. Floating pin.
[0027] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0029] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0031] Waveguide antennas are widely used in the field of radar detection due to their low loss, high power capacity, compact structure, easy processing and convenient separation. Low-profile broadband waveguide antenna arrays are an important application requirement for automotive radars. Currently used waveguide arrays are mainly achieved by cascading multiple one-to-two power splitters, which are usually extended in two directions to complete the cascade, so there is a problem of large size.
[0032] Based on this, the present invention proposes a low-profile waveguide antenna array. Figure 1-Figure 3 In one embodiment of the present invention, the low-profile waveguide antenna array 100 includes a cascaded power divider structure 1, the cascaded power divider structure 1 includes a plurality of first power dividers 11 arranged at intervals along the front-to-back direction, each of the first power dividers 11 is provided with an input port facing the left side or the right side and two output ports orthogonal to the input port, the input port is used to receive an input signal, and the output port is used to output an electromagnetic wave converted from the input signal; the two first power dividers 11 that cooperate with each other in the front-to-back direction are a first matching piece and a second matching piece, the input port of the first matching piece and the input port of the second matching piece face opposite directions, an output port in the first matching piece is connected to an input port in the second matching piece through a connecting component 12 to transmit electromagnetic waves, and the other output port in the first matching piece is connected to a first radiation element 13 to emit electromagnetic waves outward.
[0033] The technical solution of the present invention sets the input ports of every two adjacent first power dividers 11 in opposite directions, and uses multiple connecting components 12 to connect the output port of the first matching component to the input port of the second matching component in a zigzag manner, so that the multiple first power dividers 11 can only extend in one direction forward and backward, thereby reducing the height and volume of the waveguide antenna array.
[0034] The first power divider 11 is a passive device that divides an input signal equally or unequally into two output signals, and has one input port and two output ports, that is, a one-to-two power divider.
[0035] In one embodiment of the present invention, the connection component 12 includes a first waveguide tube 121 and two first waveguide elbows 122; the first waveguide tube 121 extends in the front-to-back direction; the two first waveguide elbows 122 are respectively connected to the two ends of the first waveguide tube 121, and the two first waveguide elbows 122 are connected to the output port of the first matching component and the input port of the second matching component. In this way, the first matching component is connected to the second matching component through the first waveguide tube 121 and the two first waveguide elbows 122, and the phase is controlled by controlling the length and width of the first waveguide tube 121 and the first waveguide elbow 122, and the tortuous setting of the first waveguide elbow 122 can provide sufficient space for controlling the phase.
[0036] In one embodiment of the present invention, the first waveguide elbow 122 has a first port and a second port, one of the first port and the second port is used to connect to the first waveguide tube, and the other is used to connect to the first matching piece or the second matching piece, and the electric field polarizations of the input port and the output port of the first waveguide elbow 122 are perpendicular to each other. In this way, the bending loss is reduced by using the E-H 90° bend waveguide, mode conversion is performed, and spatial layout is convenient.
[0037] In one embodiment of the present invention, the plurality of first power dividers 11, the plurality of connection components 12, and the plurality of first radiation elements 13 form a cascade power divider structure 1, wherein the cascade power divider structure 1 is provided with a plurality of cascade power divider structures 1, and the plurality of cascade power divider structures 1 are arranged in an array; the low-profile waveguide antenna array 100 further includes a parallel component 2, wherein the parallel component 2 includes a second power divider 21, a plurality of second waveguide bends 23, and a plurality of second waveguide bends 23; the second power divider 21 has an input port and a plurality of output ports, and the input port of the second power divider 21 is used To receive input signals, the multiple output ports of the second power divider 21 are respectively connected to the input ports of the first matching parts at the head end of the multiple cascade power divider structures 1; the multiple second waveguide tubes 22 each extend in the front-to-back or up-down direction, and one end of the multiple second waveguide tubes 22 is respectively connected to the multiple output ports of the second power divider 21; multiple second waveguide elbows 23, one end of each second waveguide elbow 23 is connected to the other end of the second waveguide tube 22, and the other end of the multiple waveguide elbows is connected to the input port of the cascade power divider structure 1. In this way, multiple cascade power divider structures 1 are set to significantly improve the performance of the low-profile waveguide antenna array 100, and the parallel feeding structure has low processing accuracy requirements.
[0038] Among them, in one embodiment in which a plurality of cascaded power divider structures 1 are arranged in an array, two cascaded power divider structures 1 are arranged at intervals in the up-down direction, the second power divider 21 has two output ports, and the two second waveguide tubes 22 extend in the up-down direction to form a two-row and multiple-column array; in another embodiment, the two cascaded power divider structures 1 are arranged at intervals in the front-to-back direction, the second power divider 21 has two output ports, and the two second waveguide tubes 22 extend in the front-to-back direction to form a one-row and multiple-column array.
[0039] In one embodiment of the present invention, the low-profile waveguide antenna array 100 includes two cascaded power divider structures 1, the two cascaded power divider structures 1 are arranged in a front-to-back interval, the front end and the rear end of the second power divider 21 are respectively provided with output ports, the right end of the second power divider 21 is provided with an input port, and the second waveguide tube 22 extends in the front-to-back direction; the low-profile waveguide antenna array 100 also includes a radiation component 3, the radiation component 3 includes a third power divider 31, which is provided with a right-facing input port and multiple output ports, and the input port of the third power divider 31 is used to receive an input signal, One of the multiple output ports of the third power divider 31 is arranged to the left to be connected to the input port of the second power divider 21; the radiation component 3 also includes one or more second radiation elements 32; one second radiation element 32 is arranged between the two cascade power divider structures 1, and the second radiation element 32 is connected to other output ports of the third power divider 31; multiple second radiation elements 32 are arranged between the two cascade power divider structures 1, and the multiple second radiation elements 32 are respectively connected to multiple other output ports of the third power divider 31 and the multiple second radiation elements 32 are arranged in a forward and backward spaced manner. In this arrangement, before the signal enters the second power divider 21, electromagnetic waves are emitted through the multiple second radiation elements 32 to improve the performance of the low-profile waveguide antenna array 100.
[0040] In one embodiment, the low-profile waveguide antenna array 100 is as follows Figure 2 In the even array shown in FIG. 1 , the third power divider 31 is a one-to-three power divider connected to two second radiating elements 32; in another embodiment, the low-profile waveguide antenna array 100 is as follows Figure 3 In the odd-numbered array shown, the third power divider 31 is a one-to-two power divider, connected to a second radiating element 32 .
[0041] Furthermore, an input port of the third power divider 31 is connected to an external transmitter-receiver feeder.
[0042] In one embodiment of the present invention, the two cascaded power divider structures 1 are symmetrically arranged along the axis of the input port of the third power divider 31. This is conducive to the design of a symmetrical directional pattern.
[0043] In one embodiment of the present invention, the first radiation element 13 is configured as an open waveguide or a horn antenna.
[0044] In one embodiment of the present invention, the second radiating element 32 is configured as an open waveguide or a horn antenna. In this configuration, the open waveguide or the horn antenna is used to increase the broadband width of the low-profile waveguide antenna array 100.
[0045] In one embodiment of the present invention, one output port of the third power divider 31 has the same polarization as the input port, and the remaining output ports have polarizations orthogonal to the input port, so as to facilitate subsequent phase control, so that the phase amplitude of each subsequent port meets the requirements and has consistent polarization.
[0046] In one embodiment of the present invention, the first radiation element 13 is fixedly connected to the first power divider 11 via a connector, and the connector is provided with a first floating pin 4, which penetrates into the first radiation element 13. In this way, equal or unequal power division and impedance matching of the two output ports of the first power divider 11 can be achieved by adjusting the position and height of the first floating pin 4.
[0047] In one embodiment of the present invention, the second power divider 21 is fixedly connected to the second waveguide 22 via a connector, and the connector is provided with a second floating pin 4, which penetrates into the second waveguide 22. In this way, equal or unequal power division and impedance matching of multiple output ports of the second power divider 21 can be achieved by adjusting the position and height of the second floating pin 4.
[0048] In one embodiment of the present invention, the second radiation element 32 is fixedly connected to the third power divider 31 via a connector, and the connector is provided with a third floating pin 4, which penetrates into the second radiation element 32. In this way, equal or unequal power division and impedance matching of multiple output ports of the third power divider 31 can be achieved by adjusting the position and height of the floating third pin.
[0049] Each floating pin 4 may be a cylinder, a cuboid, a step or other three-dimensional structure.
[0050] In one embodiment of the present invention, the output port of the second matching component at the end of the low-profile waveguide antenna array 100 is connected to a third radiating element 14, and the third radiating element 14 is configured as an open waveguide or a horn antenna to increase the broadband width of the low-profile waveguide antenna array 100.
[0051] On the basis of the above embodiments, array sidelobe weighting can be achieved by adjusting the position and height of each radiating element and each floating pin 4, array beam pointing deflection can be achieved by adjusting the length and width of each waveguide, and beamforming can be achieved by jointly adjusting each radiating element, each floating pin 4, and each waveguide. Among them, the radiating element includes a first radiating element 13, a second radiating element 32, and a third radiating element 14; the floating pin 4 includes a first floating pin 4, a second floating pin 4, and a third floating pin 4; and each waveguide includes a first waveguide 121 and a second waveguide 22.
[0052] Based on the above embodiment, the calculation method of the long side length (the dimension along the front-to-back direction) a of the first waveguide and the second waveguide is as follows:
[0053] It is known that the distance between two adjacent radiating elements in the front-to-back direction is d (the distance between the cavities in the two radiating elements), the width of the radiating element in the left-to-right direction is b, and the distance between the first waveguide and the second waveguide in the left-to-right direction is d0, the signal path length L between the elements of the low-profile waveguide antenna array can be obtained:
[0054] If the low-profile waveguide antenna array is an even-numbered array, the signal path length at the output end of the second power divider is L=1.5×d+0.5×d0; the signal path length of other adjacent array elements is L=d+d0-b; if the low-profile waveguide antenna array is an odd-numbered array, the signal path length of adjacent array elements is L=d+d0-b.
[0055] Further, we can get:
[0056]
[0057] Where λ0 is the operating center frequency of the waveguide antenna array; the above-mentioned feeding structure is completed within the waveguide H-plane height and usually does not exceed 1 wavelength.
[0058] In one embodiment of the present invention, a low-profile waveguide antenna array is provided, which operates in a frequency band of 76 GHz-81 GHz and has a normal beam pointing direction.
[0059] The long side of the external transceiver feeder is 2.5mm, the narrow side is 0.85mm, d = 3.5mm, b = 0.85mm, d0 = 3.7mm, we can get:
[0060] The long side of the first waveguide a1 = 2.57 mm; the long side of the second waveguide a2 = 2.42 mm.
[0061] like Figure 4 and Figure 5 This is the antenna radiation pattern, showing different frequency directions Figure 1 The consistency is good, and the beam pointing deviation is less than 1°; Figure 6 This is the antenna standing wave diagram. It can be seen that 76GHz-81GHz are all less than 2.
[0062] In another embodiment of the present invention, a low-profile waveguide antenna array is provided, which operates in the frequency band of 76 GHz-81 GHz and points the beam in the normal direction.
[0063] The long side of the external transceiver feeder is 2.5mm, the narrow side is 0.85mm, d = 3.5mm, b = 0.85mm, d0 = 3.7mm, we can get:
[0064] The long side a3 of the first waveguide is 2.57 mm, and the long side length a4 of the second waveguide is 2.57 mm.
[0065] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A low profile waveguide antenna array, characterized in that: A cascade power divider structure is included, wherein the cascade power divider structure includes a plurality of first power dividers arranged in a front-to-back direction, each of the first power dividers is provided with an input port facing the left side or the right side and two output ports orthogonal to the input port, the input port is used to receive an input signal, and the output port is used to output an electromagnetic wave converted from the input signal; The two first power dividers that cooperate with each other in the front-to-back direction are a first matching piece and a second matching piece. The input port of the first matching piece and the input port of the second matching piece face in opposite directions. An output port in the first matching piece is connected to an input port in the second matching piece through a connecting component to transmit electromagnetic waves. The other output port in the first matching piece is connected to a first radiation element to emit electromagnetic waves outward.
2. The low-profile waveguide antenna array according to claim 1, characterized in that: The connection component comprises: A first waveguide extending in a front-to-rear direction; and The two first waveguide bends are respectively connected to the two ends of the first waveguide tube, and the two first waveguide bends are connected to the output port of the first matching component and the input port of the second matching component.
3. The low-profile waveguide antenna array according to claim 2, characterized in that: The first waveguide elbow has a first port and a second port, one of the first port and the second port is used to connect the first waveguide tube, and the other is used to connect the first matching piece or the second matching piece. The electric field polarizations of the input port and the output port of the first waveguide elbow are perpendicular to each other.
4. The low-profile waveguide antenna array according to claim 1, characterized in that: There are multiple cascade power divider structures, and the multiple cascade power divider structures are arranged in an array; The low-profile waveguide antenna array further comprises a parallel assembly, wherein the parallel assembly comprises: A second power divider having an input port and a plurality of output ports, wherein the input port of the second power divider is used to receive an input signal, and the plurality of output ports of the second power divider are respectively connected to the input ports of the first matching components at the head end of the plurality of cascade power divider structures; a plurality of second waveguides, each of which extends in a front-to-back or up-to-down direction, and one end of each of which is connected to a plurality of output ports of the second power divider; and, A plurality of second waveguide bends, one end of each of the second waveguide bends is connected to the other end of the second waveguide tube, and the other ends of the plurality of waveguide bends are connected to the input port of the cascade power divider structure.
5. The low-profile waveguide antenna array according to claim 4, characterized in that: The low-profile waveguide antenna array comprises two cascade power divider structures, the two cascade power divider structures are arranged in a front-to-back interval, the front end and the rear end of the second power divider are respectively provided with output ports, the right end of the second power divider is provided with an input port, and the second waveguide extends in the front-to-back direction; The low-profile waveguide antenna array further includes a radiation component, the radiation component including a third power divider, provided with an input port facing right and a plurality of output ports, the input port of the third power divider is used to receive an input signal, one of the plurality of output ports of the third power divider is arranged facing left to be connected to the input port of the second power divider, and the radiation component further includes: A second radiation element is disposed between the two cascade power divider structures, and the second radiation element is connected to the other output port of the third power divider; or, A plurality of second radiation elements are arranged between the two cascade power divider structures, the plurality of second radiation elements are respectively connected to a plurality of other output ports of the third power divider and the plurality of second radiation elements are arranged at intervals in the front-to-back direction.
6. The low-profile waveguide antenna array according to claim 5, characterized in that: The two cascade power divider structures are symmetrically arranged along the axis of the third power divider input port.
7. The low-profile waveguide antenna array according to claim 5, characterized in that: The first radiating element is configured as an open waveguide or a horn antenna, and / or, The second radiation element is configured as an open waveguide or a horn antenna.
8. The low-profile waveguide antenna array according to claim 5, characterized in that: One output port of the third power divider has the same polarization as the input port, and the remaining output ports have polarizations orthogonal to the input port.
9. The low-profile waveguide antenna array according to claims 5-8, characterized in that: The first radiation element and the first power divider are fixedly connected via a connector, a floating pin is provided on the connector, and the floating pin penetrates into the first radiation element; and / or, The second radiation element is fixedly connected to the third power divider via a connecting member, the connecting member is provided with a floating pin, and the floating pin penetrates into the second radiation element; and / or, The second power divider is fixedly connected to the second waveguide via a connecting piece, and a floating pin is provided on the connecting piece. The floating pin penetrates into the interior of the second waveguide.
10. The low profile waveguide antenna array according to claims 1-8, characterized in that: The output port of the second matching piece at the end of the low-profile waveguide antenna array is connected to a third radiating element, and the third radiating element is configured as an open waveguide or a horn antenna.