A high-gain omnidirectional antenna based on a trapezoidal ridge waveguide

Abstract

This invention discloses a high-gain omnidirectional antenna based on a trapezoidal ridge waveguide, comprising an antenna radiating element and a feeding network. The antenna radiating element includes a first trapezoidal metal waveguide and a second trapezoidal metal waveguide. The feeding network includes a 1-to-2 stripline power divider, two TEM mode-to-TE01 mode conversion power dividers, a rectangular dielectric substrate, and a microstrip line conversion structure. The microstrip line conversion structure includes a coaxial SMA connector, a rectangular microstrip line, and two sets of metal pillars. A first rectangular ridge is introduced in the first trapezoidal metal waveguide, and a second rectangular ridge is introduced in the second trapezoidal metal waveguide to lower the cutoff frequency. A first rectangular slot on the first trapezoidal metal waveguide and a second rectangular slot on the second trapezoidal metal waveguide uniformly couple the existing symmetrical fields to generate an ideal radiation pattern. The two TEM mode-to-TE01 mode conversion power dividers achieve signal interconnection and impedance matching, and the two sets of metal pillars prevent energy leakage. The advantages are that it can achieve complete omnidirectional radiation in the horizontal direction and has stable high gain.

Description

Technical Field

[0001] This invention relates to an omnidirectional antenna, and more particularly to a high-gain omnidirectional antenna based on a trapezoidal ridge waveguide. Background Technology

[0002] An omnidirectional antenna is an antenna that radiates energy uniformly in a 360-degree horizontal plane. Omnidirectional antennas are widely used in point-to-multipoint communication, broadcasting, data transmission, and the construction of wireless spread spectrum networks, even when the positions of the receiver and transmitter are variable or uncertain. Dipole antennas, monopole antennas, biconical antennas, disk antennas, and loop antennas are the most widely used forms of omnidirectional antennas. Due to their inherent structural symmetry, these antennas can achieve good roundness; however, their polarization direction is always vertical, which limits their application in communication systems.

[0003] Scatter communication, as a long-distance communication method, is widely used in the field of communications. Point-to-multipoint vehicle-mounted communication equipment and shipborne mobile scatter communication equipment can realize real-time communication between a central base station and multiple peripheral stations, and a high-gain horizontally polarized omnidirectional antenna with an omnidirectional radiation mode is a good choice. However, compared with vertically polarized omnidirectional antennas, horizontally polarized omnidirectional antennas are more difficult to design.

[0004] The paper "Horizontally polarized omnidirectional antenna array using cascaded cavities" proposes a dual-polarized saber antenna for automotive applications. This dual-polarized saber antenna has a maximum gain of 8.64 dBi. Horizontal and vertical polarization are achieved through a thin resonant cavity and a folded slot, respectively. The structure is compact, with a cross-sectional area of ​​only 0.24λ0*0.24λ0, where λ0 is the wavelength of the electromagnetic wave at the center frequency within the antenna's operating frequency band. In fact, omnidirectional antennas with gains exceeding 10 dBi are rarely reported, especially horizontally polarized omnidirectional antennas, which are more difficult to design. However, high-gain horizontally polarized omnidirectional antennas are essential for achieving better communication quality in long-distance scattering communications. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a high-gain omnidirectional antenna based on a trapezoidal ridge waveguide that can achieve complete omnidirectionality in the horizontal direction and has stable high gain (up to 11 dBi).

[0006] The technical solution adopted by this invention to solve the above-mentioned technical problems is as follows: a high-gain omnidirectional antenna based on a trapezoidal ridge waveguide, comprising an antenna radiating element and a feeding network. The antenna radiating element comprises a first trapezoidal metal waveguide and a second trapezoidal metal waveguide. The first trapezoidal metal waveguide comprises a first upper base plate, a first lower base plate, a first left side plate, a first right side plate, a first front side plate, and a first rear side plate. The first upper base plate, the first lower base plate, the first left side plate, the first right side plate, the first front side plate, and the first rear side plate are distributed in a vertical, horizontal, front, and rear orientation, and the six components are interconnected to form a trapezoidal structure. Both the upper base plate and the first lower base plate are rectangular plates. The first left side plate and the first right side plate are two identical isosceles trapezoidal plates. The first front side plate and the first rear side plate are two identical isosceles trapezoidal plates. The first upper base plate is located above the first lower base plate and is parallel to the first lower base plate, with their center lines aligned. The first front side plate is located in front of the first rear side plate, and the first left side plate is located to the left of the first right side plate. The first upper base plate, the first lower base plate, the first left side plate, the first right side plate, and the first... A first trapezoidal cavity is formed between a front side plate and a first rear side plate. A first partition plate is disposed in the first trapezoidal cavity, and the first partition plate is located in the middle of the first trapezoidal cavity, dividing the first trapezoidal cavity into two trapezoidal cavities of the same size, distributed to the left and right. The length of the first upper bottom plate and the first lower bottom plate are both along the left-right direction, and the width is both along the front-back direction. The length of the first upper bottom plate is equal to the length of the first lower bottom plate, and the width of the first upper bottom plate is less than the width of the first lower bottom plate. A first rectangular groove is provided on the first left side plate, and the first rectangular groove penetrates the cavity along the left-right direction. The first left side plate has a long side perpendicular to the plane containing the upper surface of the first left side plate, a wide side parallel to the plane containing the upper surface of the first left side plate, one wide side of the first rectangular groove flush with the lower surface of the first left side plate, the upper surface of the first rectangular groove located below the plane containing the upper surface of the first left side plate, the distance from the front end face of the first rectangular groove to the plane of symmetry of the first left side plate being equal to the distance from the rear end face of the first rectangular groove to the plane of symmetry of the first left side plate, and the width of the first rectangular groove being less than the width of the first upper bottom plate.The first front side plate is provided with 11 first rectangular slots evenly spaced along the left-right direction, penetrating the first front side plate. The lower ends of the 11 first rectangular slots are on the same plane and parallel to the lower end of the first front side plate. The centers of the 11 first rectangular slots are on a straight line, and the distance from this line to the upper end of the first front side plate is equal to its distance to the lower end of the first front side plate. The spacing between two adjacent first rectangular slots is half a wavelength. The left end of the leftmost first rectangular slot is located to the right of the plane containing the left end of the first upper bottom plate, and the distance between them is greater than one wavelength. The right end of the rightmost first rectangular slot is located to the left of the plane containing the right end of the first upper bottom plate, and the distance between them is greater than one wavelength. The first rear side plate is provided with 11 second rectangular slots evenly spaced along the left and right direction, penetrating the first rear side plate. The lower end faces of the 11 second rectangular slots are on the same plane and parallel to the lower end face of the first rear side plate. The centers of the 11 second rectangular slots are on a straight line, and the distance from this straight line to the upper end face of the first rear side plate is equal to the distance from it to the lower end face of the first rear side plate. The spacing between two adjacent second rectangular slots is half a wavelength. The left end face of the leftmost second rectangular slot is located to the right of the plane containing the left end face of the first upper bottom plate, and the distance between them is greater than one wavelength. The right end face of the rightmost second rectangular slot is located to the left of the plane containing the right end face of the first upper bottom plate, and the distance between them is greater than one wavelength.

[0007] Eleven first rectangular seams are sequentially named from left to right as the 1st to the 11th first rectangular seams, and eleven second rectangular seams are sequentially named from left to right as the 1st to the 11th second rectangular seams. The left and right end faces of the m-th first rectangular seam are located between the right end face of the m-th second rectangular seam and the left end face of the (m+1)-th second rectangular seam, where m = 1, 2, ..., 10. The left end face of the 11th first rectangular seam is located to the right of the plane containing the right end face of the 11th second rectangular seam. A first rectangular ridge is provided within the first trapezoidal cavity. The lower end face of a rectangular ridge is fitted and connected to the upper end face of the first lower base plate, the right end face of the first rectangular ridge is fitted and connected to the left end face of the first right side plate, the left end face of the first rectangular ridge is fitted and connected to the right end face of the first left side plate, the distance from the front end face of the first rectangular ridge to the plane containing the front end face of the first lower base plate is equal to the distance from the rear end face of the first rectangular ridge to the plane containing the rear end face of the first lower base plate, the upper end face of the first rectangular ridge is flush with the upper end face of the first rectangular groove, and the first rectangular ridge passes through the first partition plate.

[0008] The second trapezoidal metal waveguide includes a second upper base plate, a second lower base plate, a second left side plate, a second right side plate, a second front side plate, and a second rear side plate. The second lower base plate, the second upper base plate, the second left side plate, the second right side plate, the second front side plate, and the second rear side plate are distributed in a vertical, horizontal, front-back, and vertical orientation, and are interconnected to form a trapezoidal structure. The second upper base plate and the second lower base plate are both rectangular plates. The second left side plate and the second right side plate are two identical isosceles trapezoidal plates. The second front side plate and the second rear side plate... The two rear side panels are two identical isosceles trapezoidal plates. The second upper base plate is located below the second lower base plate, and the second upper base plate is parallel to the second lower base plate, with their center lines collinear. The second front side plate is located in front of the second rear side plate, and the second left side plate is located to the left of the second right side plate. The second upper base plate, the second lower base plate, the second left side plate, the second right side plate, the second front side plate, and the second rear side plate form a second trapezoidal cavity, in which a second partition is provided. The second partition is located in the middle of the second trapezoidal cavity, dividing the second trapezoidal cavity into two identical trapezoidal cavities distributed to the left and right. The length of the second upper base plate and the second lower base plate are both along the left-right direction, and the width is both along the front-back direction. The length of the second upper base plate is equal to the length of the second lower base plate, and the width of the second upper base plate is less than the width of the second lower base plate. A second rectangular groove is provided on the second left side plate, penetrating the second left side plate along the left-right direction. The long side of the second rectangular groove... The second rectangular groove is perpendicular to the plane containing the upper end face of the second left side plate. The width of the second rectangular groove is parallel to the plane containing the upper end face of the second left side plate. One width of the second rectangular groove is flush with the upper end face of the second left side plate. The lower end face of the second rectangular groove is located below the plane containing the lower end face of the second left side plate. The distance from the front end face of the second rectangular groove to the plane of symmetry of the second left side plate is equal to the distance from the rear end face of the second rectangular groove to the plane of symmetry of the second left side plate. The width of the second rectangular groove is less than the width of the second upper bottom plate.The second front side plate is provided with 11 third rectangular slots evenly spaced along the left-right direction, penetrating the second front side plate. The lower ends of the 11 third rectangular slots are on the same plane and parallel to the lower end face of the second front side plate. The centers of the 11 third rectangular slots are on a straight line, and the distance from this line to the upper end face of the second front side plate is equal to the distance from it to the lower end face of the second front side plate. The spacing between two adjacent third rectangular slots is half a wavelength. The left end face of the leftmost third rectangular slot is located to the right of the plane containing the left end face of the second upper bottom plate, and the distance between them is greater than one wavelength. The right end face of the rightmost third rectangular slot is located to the right of the plane containing the left end face of the second upper bottom plate. The second upper base plate is located to the left of the plane containing its right end face, and the distance between the two is greater than one wavelength. The second rear side plate is provided with 11 fourth rectangular slots evenly spaced along the left-right direction, penetrating the second rear side plate. The lower ends of the 11 fourth rectangular slots are on the same plane and parallel to the lower end face of the second rear side plate. The centers of the 11 fourth rectangular slots are on a straight line, and the distance from this line to the upper end face of the second rear side plate is equal to its distance to the lower end face of the second rear side plate. The spacing between two adjacent fourth rectangular slots is half a wavelength. The left end face of the leftmost fourth rectangular slot is located to the right of the plane containing the left end face of the second upper base plate. The right end face of the fourth rectangular seam, located to the right of the right end face of the second upper base plate, is located to the left of the plane containing the right end face of the second upper base plate, and the distance between them is greater than one wavelength. The 11 third rectangular seams are sequentially named from left to right as the 1st to the 11th third rectangular seams, and the 11 fourth rectangular seams are sequentially named from left to right as the 1st to the 11th fourth rectangular seams. The left and right end faces of the m-th third rectangular seam are located between the right end face of the m-th fourth rectangular seam and the left end face of the (m+1)-th fourth rectangular seam. The left end face of the 11th third rectangular seam is located on the plane containing the right end face of the 11th fourth rectangular seam. On the right side of the surface; a second rectangular ridge is provided inside the second trapezoidal cavity. The lower end face of the second rectangular ridge is attached to the upper end face of the second lower base plate, the right end face of the second rectangular ridge is attached to the left end face of the second right side plate, and the left end face of the second rectangular ridge is attached to the right end face of the second left side plate. The distance from the front end face of the second rectangular ridge to the plane containing the front end face of the second lower base plate is equal to the distance from the rear end face of the second rectangular ridge to the plane containing the rear end face of the second lower base plate. The upper end face of the second rectangular ridge is flush with the upper end face of the second rectangular groove, and the second rectangular ridge passes through the second partition plate.

[0009] The second trapezoidal metal waveguide is located directly below the first trapezoidal metal waveguide, and the two are mirror images of each other. The front end face of the second bottom plate is flush with the front end face of the first bottom plate, the rear end face of the second bottom plate is flush with the rear end face of the first bottom plate, the left end face of the second bottom plate is flush with the left end face of the first bottom plate, and the right end face of the second bottom plate is flush with the right end face of the first bottom plate.

[0010] The power supply network includes a 1-to-2 stripline power divider, two TEM mode-TE01 mode conversion power dividers, a rectangular dielectric substrate, and a microstrip-to-stripline conversion structure. The rectangular dielectric substrate is disposed between the first and second lower base plates. The front end face of the rectangular dielectric substrate is flush with the front end face of the first lower base plate, the rear end face of the rectangular dielectric substrate is flush with the rear end face of the first lower base plate, the left end face of the rectangular dielectric substrate is flush with the left end face of the first lower base plate, and the right end face of the rectangular dielectric substrate is flush with the right end face of the first lower base plate. The lower end face of the rectangular dielectric substrate is attached to the upper end face of the second lower base plate. A vertically penetrating... The rectangular dielectric substrate has a first through hole and a second through hole, which are spaced apart horizontally. The distance from the center line connecting the center of the first and second through holes to the front end face of the rectangular dielectric substrate is equal to the distance from the center line to the rear end face of the rectangular dielectric substrate. The distance from the central axis of the first through hole to the left end face of the rectangular dielectric substrate is equal to one-quarter of the length of the rectangular dielectric substrate in the left-right direction. The distance from the central axis of the second through hole to the right end face of the rectangular dielectric substrate is equal to one-quarter of the length of the rectangular dielectric substrate in the left-right direction. The 1-to-2 stripline power divider is attached to the upper surface of the rectangular dielectric substrate and is in contact with the lower end face of the first bottom plate. The line power divider has one input terminal and two output terminals. The two output terminals of the one-to-two stripline line power divider are referred to as the first output terminal and the second output terminal, respectively. The two TEM mode_TE01 mode conversion power dividers are referred to as the first TEM mode_TE01 mode conversion power divider and the second TEM mode_TE01 mode conversion power divider, respectively. The first TEM mode_TE01 mode conversion power divider is installed at the first through hole and extends into the first trapezoidal cavity and the second trapezoidal cavity. The upper end face of the first TEM mode_TE01 mode conversion power divider is in contact with the lower end face of the first upper base plate, and the lower end face of the first TEM mode_TE01 mode conversion power divider is in contact with... The upper surface of the second upper base plate is attached to the first upper base plate. The second TEM mode_TE01 mode converter is installed at the second through hole and extends into the first trapezoidal cavity and the second trapezoidal cavity. The upper surface of the second TEM mode_TE01 mode converter is attached to the lower surface of the first upper base plate, and the lower surface of the second TEM mode_TE01 mode converter is attached to the upper surface of the second upper base plate. The first output terminal of the 1-to-2 stripline power divider is connected to the first TEM mode_TE01 mode converter, and the second output terminal of the 1-to-2 stripline power divider is connected to the second TEM mode_TE01 mode converter.The microstrip line conversion structure includes a coaxial SMA connector, a rectangular microstrip line, and two sets of metal pillars. The left end face of the first left side plate, the left end face of the second left side plate, and the left end face of the rectangular dielectric substrate are joined to form a hexagon. The coaxial SMA connector is installed at the center of this hexagon. The rectangular microstrip line is attached to the upper surface of the rectangular dielectric substrate and is in contact with the first lower base plate. The front end face of the rectangular microstrip line is parallel to the plane containing the front end face of the rectangular dielectric substrate. The left end face of the rectangular microstrip line... Connected to the coaxial SMA connector, the right end face of the rectangular microstrip line is connected to the input terminal of the 1-to-2 stripline power divider. Two sets of metal pillars each comprise n metal cylinders, where n is an integer greater than or equal to 6. These two sets of metal pillars are referred to as the first set and the second set, respectively. The n metal cylinders in the first set are evenly spaced from left to right. All n metal cylinders in the first set penetrate the rectangular dielectric substrate. The upper end face of the n metal cylinders in the first set is connected to... The upper surface of the rectangular dielectric substrate is flush with the lower surface of the n metal cylinders in the first group of metal pillars. A portion of the metal cylinders in the first group are located in front of the rectangular microstrip line, and another portion are located in front of the input terminal of the 1-to-2 stripline power divider. The n metal cylinders in the second group of metal pillars are evenly spaced from left to right, and all n metal cylinders in the second group penetrate the rectangular dielectric substrate. The upper surfaces of the n metal cylinders in the second group of metal pillars are flush with the upper surface of the rectangular dielectric substrate, and the lower surfaces of the n metal cylinders in the second group of metal pillars are also flush with the lower surface of the rectangular dielectric substrate. A portion of the metal cylinders in the second group of metal pillars are located behind the rectangular microstrip line, and another portion of the metal cylinders are located behind the input terminal of the 1-to-2 stripline power divider. The n metal cylinders in the first group of metal pillars and the n metal cylinders in the second group of metal pillars are aligned one-to-one.

[0011] Both the first TEM mode_TE01 mode converter and the second TEM mode_TE01 mode converter are implemented using two metal cylinders.

[0012] Compared with the prior art, the advantage of this invention lies in constructing a high-gain omnidirectional antenna based on a trapezoidal ridge waveguide using an antenna radiating element and a feeding network. The antenna radiating element is composed of a first trapezoidal metal waveguide and a second trapezoidal metal waveguide. The first trapezoidal metal waveguide has a first rectangular ridge and 11 first rectangular slots, and the second trapezoidal metal waveguide has a second rectangular ridge and 11 second rectangular slots. Introducing the first rectangular ridge into the first trapezoidal metal waveguide can reduce the cutoff frequency of the first trapezoidal metal waveguide, making the antenna structure smaller and more compact. Introducing the second rectangular ridge into the second trapezoidal metal waveguide can reduce the cutoff frequency of the second trapezoidal metal waveguide, making the antenna structure smaller and more compact. The 11 first rectangular slots on the first left and first right plates of the first trapezoidal metal waveguide can uniformly couple the symmetrical fields present on the first left and first right plates of the first trapezoidal metal waveguide to generate an ideal radiation pattern. Similarly, the 11 second rectangular slots on the second left and second right plates of the second trapezoidal metal waveguide can uniformly couple the symmetrical fields present on the second left and second right plates of the second trapezoidal metal waveguide to generate an ideal radiation pattern. The feed network includes a 1-to-2 stripline power divider, a first TEM mode-to-TE01 mode conversion power divider, a second TEM mode-to-TE01 mode conversion power divider, a rectangular dielectric substrate, and a microstrip line conversion structure. The two-way stripline power divider outputs the energy of the input signal to the first TEM mode to TE01 mode converter and the second TEM mode to TE01 mode converter in a 1:1 ratio. The function of the first and second TEM mode to TE01 mode converters is to convert the TEM mode electromagnetic waves transmitted in the two-way stripline power divider into TE01 mode electromagnetic waves for transmission on the first and second trapezoidal metal waveguides. Signal interconnection and impedance matching are achieved through the first and second TEM mode to TE01 mode converters. The microstrip line-strip line conversion structure has a discontinuous structure in the middle, so a first set of metal pillars and a second set of metal pillars are used to prevent energy leakage. The coaxial SMA connector in the microstrip line-strip line conversion structure is model SMA-KFD70702, which supports a frequency range of DC-40GHz, covering the required operating frequency band. Through the design of the first trapezoidal metal waveguide, the second trapezoidal metal waveguide, 11 first rectangular slots and 11 second rectangular slots, the omnidirectional radiation performance of the azimuth plane of the present invention is improved and a high gain of 11dBi is achieved. Thus, the present invention can achieve complete omnidirectional radiation in the horizontal direction and has a stable high gain (up to 11dBi). Attached Figure Description

[0013] Figure 1 This is a three-dimensional view of the high-gain omnidirectional antenna based on a trapezoidal ridge waveguide of the present invention;

[0014] Figure 2 This is an exploded view of the high-gain omnidirectional antenna based on a trapezoidal ridge waveguide of the present invention.

[0015] Figure 3 This is a top view of the feeding network for the high-gain omnidirectional antenna based on a trapezoidal ridge waveguide according to the present invention.

[0016] Figure 4 This is a partially enlarged view of the feeding network of the high-gain omnidirectional antenna based on a trapezoidal ridge waveguide according to the present invention;

[0017] Figure 5 The gain curve of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention is shown.

[0018] Figure 6 The reflection coefficient diagram of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention is shown.

[0019] Figure 7 The normalized radiation pattern of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention in the elevation plane at 15 GHz.

[0020] Figure 8 The azimuth normalized radiation pattern of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention at 15 GHz.

[0021] Figure 9 The normalized radiation pattern of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention in the elevation plane at 14.5 GHz;

[0022] Figure 10 This is the azimuth plane normalized radiation pattern of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention at 14.5 GHz;

[0023] Figure 11 This is the azimuth normalized radiation pattern of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention at 15.5 GHz.

[0024] Figure 12 This is the normalized radiation pattern of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention in the elevation plane at 15.5 GHz. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] Example: Figures 1 to 4As shown, a high-gain omnidirectional antenna based on a trapezoidal ridge waveguide includes an antenna radiating element and a feeding network. The antenna radiating element includes a first trapezoidal metal waveguide 1 and a second trapezoidal metal waveguide 2. The first trapezoidal metal waveguide 1 includes a first upper base plate 3, a first lower base plate 4, a first left side plate 5, a first right side plate 6, a first front side plate 7, and a first rear side plate 8. The first upper base plate 3, the first lower base plate 4, the first left side plate 5, the first right side plate 6, the first front side plate 7, and the first rear side plate 8 are distributed in the vertical, horizontal, front, and rear directions, and are interconnected to form a trapezoidal structure. The first upper base plate 3 and the first lower base plate 4 are both rectangular plates, the first left side plate 5 and the first right side plate 6 are two identical isosceles trapezoidal plates, and the first front side plate 7... The first upper base plate 3 and the first lower base plate 4 are identical isosceles trapezoidal plates. The first upper base plate 3 is located above the first lower base plate 4, and the first upper base plate 3 is parallel to the first lower base plate 4, with their center lines on the same straight line. The first front base plate 7 is located in front of the first rear base plate 8, and the first left side plate 5 is located to the left of the first right side plate 6. The first upper base plate 3, the first lower base plate 4, the first left side plate 5, the first right side plate 6, the first front base plate 7, and the first rear base plate 8 form a first trapezoidal cavity. A first partition is provided in the first trapezoidal cavity, located in the middle of the first trapezoidal cavity, dividing the first trapezoidal cavity into two identical trapezoidal cavities distributed to the left and right. The length directions of the first upper base plate 3 and the first lower base plate 4 are both along the left-right direction. The width direction is along the front-to-back direction. The length of the first upper base plate 3 is equal to the length of the first lower base plate 4, and the width of the first upper base plate 3 is less than the width of the first lower base plate 4. A first rectangular groove 9 is provided on the first left side plate 5, which penetrates the first left side plate 5 in the left-to-right direction. The long side of the first rectangular groove 9 is perpendicular to the plane where the upper end face of the first left side plate 5 is located, and the wide side of the first rectangular groove 9 is parallel to the plane where the upper end face of the first left side plate 5 is located. One wide side of the first rectangular groove 9 is flush with the lower end face of the first left side plate 5, and the upper end face of the first rectangular groove 9 is located below the plane where the upper end face of the first left side plate 5 is located. The distance from the front end face of the first rectangular groove 9 to the plane of symmetry of the first left side plate 5 is equal to the rear end face of the first rectangular groove 9. The distance to the symmetrical plane of the first left side plate 5; the width of the first rectangular groove 9 is less than the width of the first upper bottom plate 3; eleven first rectangular slots 10 are evenly spaced along the left-right direction on the first front side plate 7, penetrating the first front side plate 7. The lower ends of the eleven first rectangular slots 10 are on the same plane and parallel to the lower end of the first front side plate 7. The centers of the eleven first rectangular slots 10 are on a straight line, and the distance from this line to the upper end of the first front side plate 7 is equal to its distance to the lower end of the first front side plate 7. The spacing between two adjacent first rectangular slots 10 is half a wavelength. The left end of the leftmost first rectangular slot 10 is located to the right of the plane containing the left end of the first upper bottom plate 3, and the distance between them is greater than one wavelength.The right end face of the first rectangular slit 10 located on the far right is to the left of the plane containing the right end face of the first upper base plate 3, and the distance between them is greater than one wavelength. Eleven second rectangular slits 11 are evenly spaced along the left-right direction on the first rear side plate 8, penetrating the first rear side plate 8. The lower end faces of the eleven second rectangular slits 11 are on the same plane and parallel to the lower end face of the first rear side plate 8. The centers of the eleven second rectangular slits 11 are on a straight line, and the distance from this line to the upper end face of the first rear side plate 8 is equal to its distance to the lower end face of the first rear side plate 8. The spacing between two adjacent second rectangular slits 11 is half a wavelength. The left end face of the leftmost second rectangular slit 11 is to the right of the plane containing the left end face of the first upper base plate 3, and the distance between them is greater than one wavelength. The right end face of the rightmost second rectangular slit 11 is located to the left of the plane containing the right end face of the first upper base plate 3, and the distance between them is greater than one wavelength. The 11 first rectangular slits 10 are sequentially named from left to right as the 1st to the 11th first rectangular slits 10, and the 11 second rectangular slits 11 are sequentially named from left to right as the 1st to the 11th second rectangular slits 11. The left and right end faces of the m-th first rectangular slit 10 are located between the right end face of the m-th second rectangular slit 11 and the left end face of the (m+1)-th second rectangular slit 11, where m = 1, 2, ..., 10. The left end face of the 11th first rectangular slit 10 is located at the right end face of the 11th second rectangular slit 11. On the right side of the plane containing the first trapezoidal cavity, a first rectangular ridge 12 is provided. The lower end face of the first rectangular ridge 12 is attached to the upper end face of the first lower base plate 4, the right end face of the first rectangular ridge 12 is attached to the left end face of the first right side plate 6, and the left end face of the first rectangular ridge 12 is attached to the right end face of the first left side plate 5. The distance from the front end face of the first rectangular ridge 12 to the plane containing the front end face of the first lower base plate 4 is equal to the distance from the rear end face of the first rectangular ridge 12 to the plane containing the rear end face of the first lower base plate 4. The upper end face of the first rectangular ridge 12 is flush with the upper end face of the first rectangular groove 9. The first rectangular ridge 12 passes through the first partition. The second trapezoidal metal waveguide 2 includes a second upper base plate 13, a second lower base plate 14, a second left side plate 15, and a second right side plate 16. Plate 16, second front side plate 17, and second rear side plate 18, second lower base plate 14, second upper base plate 13, second left side plate 15, second right side plate 16, second front side plate 17, and second rear side plate 18 are distributed in vertical, horizontal, front, and back orientations, and are interconnected to form a trapezoidal structure. The second upper base plate 13 and second lower base plate 14 are both rectangular plates. The second left side plate 15 and second right side plate 16 are two identical isosceles trapezoidal plates. The second front side plate 17 and second rear side plate 18 are two identical isosceles trapezoidal plates. The second upper base plate 13 is located below the second lower base plate 14, parallel to the second lower base plate 14, and their center lines are on the same straight line. The second front side plate 17 is located in front of the second rear side plate 18.The second left side plate 15 is located to the left of the second right side plate 16. The second upper bottom plate 13, the second lower bottom plate 14, the second left side plate 15, the second right side plate 16, the second front side plate 17, and the second rear side plate 18 form a second trapezoidal cavity. A second partition 25 is provided in the second trapezoidal cavity, located in the middle of the second trapezoidal cavity, dividing the second trapezoidal cavity into two trapezoidal cavities of the same size, distributed to the left and right. The length of the second upper bottom plate 13 and the second lower bottom plate 14 are both along the left-right direction, and the width is both along the front-back direction. The length of the second upper bottom plate 13 is equal to the length of the second lower bottom plate 14, and the width of the second upper bottom plate 13 is less than the width of the second lower bottom plate 14. The second left side plate 15 is provided with... A second rectangular groove 19 is provided, which penetrates the second left side plate 15 in a left-right direction. The long side of the second rectangular groove 19 is perpendicular to the plane containing the upper end face of the second left side plate 15, and the wide side of the second rectangular groove 19 is parallel to the plane containing the upper end face of the second left side plate 15. One wide side of the second rectangular groove 19 is flush with the upper end face of the second left side plate 15, and the lower end face of the second rectangular groove 19 is located below the plane containing the lower end face of the second left side plate 15. The distance from the front end face of the second rectangular groove 19 to the plane of symmetry of the second left side plate 15 is equal to the distance from the rear end face of the second rectangular groove 19 to the plane of symmetry of the second left side plate 15. The width of the wide side of the second rectangular groove 19 is less than the width of the second upper base plate 13. Eleven third rectangular slots 20 are evenly spaced along the left-right direction on the side plate 17, penetrating the second front side plate 17. The lower ends of the eleven third rectangular slots 20 are on the same plane and parallel to the lower end of the second front side plate 17. The centers of the eleven third rectangular slots 20 are on a straight line, and the distance from this line to the upper end of the second front side plate 17 is equal to the distance from it to the lower end of the second front side plate 17. The spacing between two adjacent third rectangular slots 20 is half a wavelength. The left end of the leftmost third rectangular slot 20 is located to the right of the plane containing the left end of the second upper bottom plate 13, and the distance between them is greater than one wavelength. The right end of the rightmost third rectangular slot 20 is located to the right of the plane containing the left end of the second upper bottom plate 13. The left side of the plane containing the right end face is located to the left of the plane containing the left end face of the second upper bottom plate 13, and the distance between them is greater than one wavelength. Eleven fourth rectangular slots 21 are evenly spaced along the left-right direction on the second rear side plate 18, penetrating the second rear side plate 18. The lower end faces of the eleven fourth rectangular slots 21 are on the same plane and parallel to the lower end face of the second rear side plate 18. The centers of the eleven fourth rectangular slots 21 are on a straight line, and the distance from this line to the upper end face of the second rear side plate 18 is equal to its distance to the lower end face of the second rear side plate 18. The spacing between two adjacent fourth rectangular slots 21 is half a wavelength. The left end face of the leftmost fourth rectangular slot 21 is located to the right of the plane containing the left end face of the second upper bottom plate 13, and the distance between them is greater than one wavelength.The right end face of the fourth rectangular slit 21 located on the far right is to the left of the plane containing the right end face of the second upper base plate 13, and the distance between them is greater than one wavelength; the 11 third rectangular slits 20 are sequentially named from left to right as the 1st to the 11th third rectangular slits 20, and the 11 fourth rectangular slits 21 are sequentially named from left to right as the 1st to the 11th fourth rectangular slits 21. The left and right end faces of the m-th third rectangular slit 20 are located between the right end face of the m-th fourth rectangular slit 21 and the left end face of the (m+1)-th fourth rectangular slit 21, and the left end face of the 11th third rectangular slit 20 is located to the right of the plane containing the right end face of the 11th fourth rectangular slit 21; the second trapezoidal cavity is provided with The second rectangular ridge 22 has its lower end face attached to the upper end face of the second lower base plate 14, its right end face attached to the left end face of the second right side plate 16, and its left end face attached to the right end face of the second left side plate 15. The distance from the front end face of the second rectangular ridge 22 to the plane containing the front end face of the second lower base plate 14 is equal to the distance from the rear end face of the second rectangular ridge 22 to the plane containing the rear end face of the second lower base plate 14. The upper end face of the second rectangular ridge 22 is flush with the upper end face of the second rectangular groove 19. The second rectangular ridge 22 passes through the second partition plate 25. The second trapezoidal metal waveguide 2 is located directly below the first trapezoidal metal waveguide 1, and the two are mirror images of each other. The front end face of the second lower base plate 14 is flush with the front end face of the first lower base plate 4. The front end face of the second lower base plate 14 is flush with the rear end face of the first lower base plate 4, the left end face of the second lower base plate 14 is flush with the left end face of the first lower base plate 4, and the right end face of the second lower base plate 14 is flush with the right end face of the first lower base plate 4. The power supply network includes a 1-to-2 stripline power divider 23, two TEM mode_TE01 mode conversion power dividers, a rectangular dielectric board 24, and a microstrip line-to-stripline conversion structure. The rectangular dielectric board 24 is disposed between the first lower base plate 4 and the second lower base plate 14. The front end face of the rectangular dielectric board 24 is flush with the front end face of the first lower base plate 4, the rear end face of the rectangular dielectric board 24 is flush with the rear end face of the first lower base plate 4, and the left end face of the rectangular dielectric board 24 is flush with the left end face of the first lower base plate 4. The right end face of plate 24 is flush with the right end face of the first lower base plate 4; the lower end face of rectangular dielectric plate 24 is in contact with the upper end face of the second lower base plate 14; the rectangular dielectric plate 24 is provided with a first through hole 241 and a second through hole 242 that pass through vertically, the first through hole 241 and the second through hole 242 are distributed alternately from left to right, the distance from the center line connecting the center of the first through hole 241 and the second through hole 242 to the front end face of the rectangular dielectric plate 24 is equal to the distance from the center line connecting the center to the rear end face of the rectangular dielectric plate 24, the distance from the central axis of the first through hole to the left end face of the rectangular dielectric plate 24 is equal to one-quarter of the length of the rectangular dielectric plate 24 in the left-right direction, and the distance from the central axis of the second through hole to the right end face of the rectangular dielectric plate 24 is equal to one-quarter of the length of the rectangular dielectric plate 24 in the left-right direction.A 1-to-2 stripline power divider 23 is attached to the upper surface of the rectangular dielectric plate 24 and is in contact with the lower end face of the first lower base plate 4. The 1-to-2 stripline power divider 23 has one input terminal and two output terminals. The two output terminals of the 1-to-2 stripline power divider 23 are referred to as the first output terminal and the second output terminal, respectively. The two TEM mode_TE01 mode conversion power dividers are referred to as the first TEM mode_TE01 mode conversion power divider 26 and the second TEM mode_TE01 mode conversion power divider 27, respectively. The first TEM mode_TE01 mode conversion power divider 26 is installed at the first through hole and extends into the first trapezoidal cavity and the second trapezoidal cavity. The upper end face of the first TEM mode_TE01 mode conversion power divider 26 is... The lower end face of the first TEM mode_TE01 mode converter 26 is attached to the lower end face of the first upper base plate 3, and the upper end face of the second TEM mode_TE01 mode converter 27 is installed at the second through hole and extends into the first trapezoidal cavity and the second trapezoidal cavity. The upper end face of the second TEM mode_TE01 mode converter 27 is attached to the lower end face of the first upper base plate 3, and the lower end face of the second TEM mode_TE01 mode converter 27 is attached to the upper end face of the second upper base plate 13. The first output terminal of the 1-to-2 stripline power divider 23 is connected to the first TEM mode_TE01 mode converter 26, and the second output terminal of the 1-to-2 stripline power divider 23 is connected to... The second TEM mode_TE01 mode converter power divider 27 is connected. The microstrip line / stripline conversion structure includes a coaxial SMA connector 28, a rectangular microstrip line 29, and two sets of metal pillars. The left end face of the first left side plate 5, the left end face of the second left side plate 15, and the left end face of the rectangular dielectric plate 24 are spliced ​​to form a hexagon. The coaxial SMA connector 28 is installed at the center of this hexagon. The rectangular microstrip line 29 is attached to the upper surface of the rectangular dielectric plate 24 and is in contact with the first lower base plate 4. The front end face of the rectangular microstrip line 29 is parallel to the plane of the front end face of the rectangular dielectric plate 24. The left end face of the rectangular microstrip line 29 is connected to the coaxial SMA connector 28, and the right end face of the rectangular microstrip line 29 is connected to the input end of the 1-to-2 stripline power divider 23. The two sets of metal pillars... Each group comprises n metal cylinders, where n is an integer greater than or equal to 6. These two groups of metal cylinders are referred to as the first group 30 and the second group 31, respectively. The n metal cylinders in the first group 30 are evenly spaced from left to right. All n metal cylinders in the first group 30 penetrate the rectangular dielectric substrate 24. The upper and lower surfaces of the n metal cylinders in the first group 30 are flush with the upper and lower surfaces of the rectangular dielectric substrate 24. A portion of the metal cylinders in the first group 30 are located in front of the rectangular microstrip line 29, and another portion are located in front of the input terminal of the 1-to-2 stripline power divider 23.The n metal cylinders in the second group of metal pillars 31 are evenly spaced from left to right. All n metal cylinders in the second group of metal pillars 31 penetrate the rectangular dielectric substrate 24. The upper and lower surfaces of the n metal cylinders in the second group of metal pillars 31 are flush with the upper surface of the rectangular dielectric substrate 24. Some of the metal cylinders in the second group of metal pillars 31 are located behind the rectangular microstrip line 29, and another part is located behind the input terminal of the 1-to-2 stripline power divider 23. The n metal cylinders in the first group of metal pillars 30 and the n metal cylinders in the second group of metal pillars 31 are aligned one-to-one.

[0027] In this embodiment, both the first TEM mode_TE01 mode converter 26 and the second TEM mode_TE01 mode converter 27 are implemented using two metal cylinders.

[0028] The gain curve of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of this invention in the operating frequency band was obtained by simulation under ideal conditions using electromagnetic simulation software, as shown in the figure. Figure 5 As shown, analysis Figure 5 It can be seen that the gain of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention is stable and all values ​​are above 11 dBi. The reflection coefficient diagram of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention within the operating frequency band was obtained using electromagnetic simulation software under ideal conditions, as shown below. Figure 6 As shown, analysis Figure 6 It can be seen that the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention has low return loss, with the return loss being below -10dB throughout the entire operating frequency band. The normalized radiation pattern of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention in the elevation plane at 15GHz was obtained by simulation under ideal conditions using electromagnetic simulation software, as shown below. Figure 7 As shown, analysis Figure 7 It can be seen that the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention has a stable elevation plane radiation pattern at 15 GHz. The azimuth plane normalized radiation pattern of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention at 15 GHz was obtained by simulation under ideal conditions using electromagnetic simulation software, as shown below. Figure 8 As shown, analysis Figure 8 It can be seen that the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention has a stable downplane radiation pattern at 15 GHz. The normalized elevation plane radiation pattern of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention at 14.5 GHz was obtained by simulation under ideal conditions using electromagnetic simulation software, as shown below. Figure 9 As shown, analysis Figure 9It can be seen that the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of this invention has a stable elevation plane radiation pattern at 14.5 GHz. The azimuth plane normalized radiation pattern of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of this invention at 14.5 GHz was obtained by electromagnetic simulation software under ideal conditions, as shown below. Figure 10 As shown, analysis Figure 10 It can be seen that the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention has a stable azimuth plane pattern at a frequency of 14.5 GHz. The azimuth plane normalized pattern of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention at 15.5 GHz was obtained by simulation under ideal conditions using electromagnetic simulation software, as shown below. Figure 11 As shown, analysis Figure 11 It can be seen that the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of this invention has a stable elevation pattern at 15.5 GHz. The normalized elevation pattern of the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of this invention at 15.5 GHz was obtained by simulation under ideal conditions using electromagnetic simulation software, as shown below. Figure 12 As shown, analysis Figure 12 It can be seen that the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention has a stable lower plane radiation pattern at a frequency of 15.5 GHz.

[0029] In summary, the high-gain omnidirectional antenna based on the trapezoidal ridge waveguide of the present invention can achieve stable omnidirectional performance in the horizontal direction and has stable high gain.

Claims

1. A high-gain omni-directional antenna based on trapezoidal ridge waveguide, characterized in that The application relates to an antenna radiation unit and a feed network, the antenna radiation unit comprising a first trapezoidal metal waveguide and a second trapezoidal metal waveguide, the first trapezoidal metal waveguide comprising a first upper bottom plate, a first lower bottom plate, a first left side plate, a first right side plate, a first front side plate, a first back side plate, a first partition plate, a first rectangular slot and a first rectangular ridge; the first upper bottom plate and the first lower bottom plate are both rectangular plates, the first left side plate and the first right side plate are two completely identical isosceles trapezoidal plates, the first front side plate and the first back side plate are two completely identical isosceles trapezoidal plates, the first upper bottom plate is parallel to the first lower bottom plate, and the center lines of the two plates are located on the same straight line, the first upper bottom plate, the first lower bottom plate, the first left side plate, the first right side plate, the first front side plate and the first back side plate form a first trapezoidal cavity after being connected with each other, the first partition plate is arranged in the middle of the first trapezoidal cavity and equally divides the first trapezoidal cavity, the length direction of the first upper bottom plate and the first lower bottom plate is along the left-right direction, and the width direction of the first upper bottom plate and the first lower bottom plate is along the front-back direction, the length of the first upper bottom plate is equal to the length of the first lower bottom plate, and the width of the first upper bottom plate is smaller than the width of the first lower bottom plate; the first rectangular slot penetrates through the first left side plate along the left-right direction, the long side direction of the first rectangular slot is perpendicular to the plane where the upper end surface of the first left side plate is located, the wide side direction of the first rectangular slot is parallel to the plane where the upper end surface of the first left side plate is located, one wide side of the first rectangular slot is flush with the lower end surface of the first left side plate, the upper end surface of the first rectangular slot is located below the plane where the upper end surface of the first left side plate is located, the distance from the front end surface of the first rectangular slot to the symmetry plane of the first left side plate is equal to the distance from the back end surface of the first rectangular slot to the symmetry plane of the first left side plate, and the width of the first rectangular slot is smaller than the width of the first upper bottom plate; 11 first rectangular slots are uniformly and evenly arranged on the first front side plate along the left-right direction, the lower end surfaces of the 11 first rectangular slots are located on the same plane and are parallel to the lower end surface of the first front side plate, the centers of the 11 first rectangular slots are located on a straight line, the distance from the straight line to the upper end surface of the first front side plate is equal to the distance from the straight line to the lower end surface of the first front side plate, the interval between two adjacent first rectangular slots is half a wavelength, the left end surface of the leftmost first rectangular slot is located on the right side of the plane where the left end surface of the first upper bottom plate is located, and the distance between the left end surface of the leftmost first rectangular slot and the plane where the left end surface of the first upper bottom plate is located is greater than one wavelength, the right end surface of the rightmost first rectangular slot is located on the left side of the plane where the right end surface of the first upper bottom plate is located, and the distance between the right end surface of the rightmost first rectangular slot and the plane where the right end surface of the first upper bottom plate is located is greater than one wavelength; 11 second rectangular slots are uniformly and evenly arranged on the first back side plate along the left-right direction, the lower end surfaces of the 11 second rectangular slots are located on the same plane and are parallel to the lower end surface of the first back side plate, the centers of the 11 second rectangular slots are located on a straight line, the distance from the straight line to the upper end surface of the first back side plate is equal to the distance from the straight line to the lower end surface of the first back side plate, the interval between two adjacent second rectangular slots is half a wavelength, the left end surface of the leftmost second rectangular slot is located on the right side of the plane where the left end surface of the first upper bottom plate is located, and the distance between the left end surface of the leftmost second rectangular slot and the plane where the left end surface of the first upper bottom plate is located is greater than one wavelength, and the right end surface of the rightmost second rectangular slot is located on the left side of the plane where the right end surface of the first upper bottom plate is located, and the distance between the right end surface of the rightmost second rectangular slot and the plane where the right end surface of the first upper bottom plate is located is greater than one wavelength.The 11 first rectangular slits are sequentially called the 1st first rectangular slit to the 11th first rectangular slit from left to right, and the 11 second rectangular slits are sequentially called the 1st second rectangular slit to the 11th second rectangular slit from left to right, the left end face and the right end face of the mth first rectangular slit are located between the right end face of the mth second rectangular slit and the left end face of the m+1th second rectangular slit, m=1, 2, …, 10, and the left end face of the 11th first rectangular slit is located to the right of the plane where the right end face of the 11th second rectangular slit is located; the first rectangular ridge is arranged in the first trapezoidal cavity and penetrates the first partition plate, the lower end face of the first rectangular ridge is attached to the upper end face of the first lower bottom plate, the right end face is attached to the left end face of the first right side plate, the left end face is attached to the right end face of the first left side plate, the distance from the front end face to the plane where the front end face of the first lower bottom plate is located is equal to the distance from the back end face to the plane where the back end face of the first lower bottom plate is located, and the upper end face is flush with the upper end face of the first rectangular groove; the second trapezoidal metal waveguide is located directly below the first trapezoidal metal waveguide, and the two are mirror images with respect to the rectangular dielectric plate arranged therebetween; the part of the second trapezoidal metal waveguide that is a mirror image of the first front side plate is called the second front side plate, and the part that is a mirror image of the first back side plate is called the second back side plate; 11 third rectangular slits that penetrate the second front side plate are uniformly and evenly spaced in the left-right direction on the second front side plate, the lower end faces of the 11 third rectangular slits are on the same plane and parallel to the lower end face of the second front side plate, the centers of the 11 third rectangular slits are on a straight line, and the distance from the straight line to the upper end face of the second front side plate is equal to the distance from the straight line to the lower end face of the second front side plate, the distance between adjacent two third rectangular slits is half a wavelength, the left end face of the leftmost third rectangular slit is located to the right of the plane where the left end face of the second upper bottom plate is located and the distance between the two is greater than one wavelength, and the right end face of the rightmost third rectangular slit is located to the left of the plane where the right end face of the second upper bottom plate is located and the distance between the two is greater than one wavelength; 11 fourth rectangular slits that penetrate the second back side plate are uniformly and evenly spaced in the left-right direction on the second back side plate, the lower end faces of the 11 fourth rectangular slits are on the same plane and parallel to the lower end face of the second back side plate, the centers of the 11 fourth rectangular slits are on a straight line, and the distance from the straight line to the upper end face of the second back side plate is equal to the distance from the straight line to the lower end face of the second back side plate, the distance between adjacent two fourth rectangular slits is half a wavelength, the left end face of the leftmost fourth rectangular slit is located to the right of the plane where the left end face of the second upper bottom plate is located and the distance between the two is greater than one wavelength, and the right end face of the rightmost fourth rectangular slit is located to the left of the plane where the right end face of the second upper bottom plate is located and the distance between the two is greater than one wavelength.The 11 third rectangular slits are sequentially called the 1st third rectangular slit to the 11th third rectangular slit from right to left, and the 11 fourth rectangular slits are sequentially called the 1st fourth rectangular slit to the 11th fourth rectangular slit from right to left; the left end face and the right end face of the mth third rectangular slit are located between the right end face of the mth fourth rectangular slit and the left end face of the m+1th fourth rectangular slit; the left end face of the 11th third rectangular slit is located on the left side of the plane where the left end face of the 11th fourth rectangular slit is located. The feeding network comprises a 1:2 strip-line power divider, a first TEM-TE01 mode conversion power divider, a second TEM-TE01 mode conversion power divider and a microstrip-line-to-strip-line conversion structure, the front, rear, left and right end surfaces of the rectangular dielectric plate are flush with the front, rear, left and right end surfaces of the first lower bottom plate respectively, and the lower end surface is attached to the upper end surface of the second trapezoidal metal waveguide;The rectangular dielectric plate is provided with a first through hole and a second through hole penetrating from top to bottom, the first through hole and the second through hole are distributed left and right with a distance, and the center line of the two to the front end face of the rectangular dielectric plate is equal to the distance of the center line to the back end face of the rectangular dielectric plate, the center axis of the first through hole to the left end face of the rectangular dielectric plate is equal to one quarter of the length of the rectangular dielectric plate along the left and right direction, the center axis of the second through hole to the right end face of the rectangular dielectric plate is equal to one quarter of the length of the rectangular dielectric plate along the left and right direction, a one-to-two strip line power divider is attached to the upper surface of the rectangular dielectric plate and is in contact with the lower end face of the first bottom plate, the one-to-two strip line power divider has an input end and two output ends, a first TEM-TE01 mode conversion power divider is installed at the first through hole and extends into the first trapezoidal cavity and the second trapezoidal metal waveguide, the upper end face and the lower end face of the first TEM-TE01 mode conversion power divider are in contact with the lower end face of the first upper plate and the upper end face of the second trapezoidal metal waveguide respectively, a second TEM-TE01 mode conversion power divider is installed at the second through hole and extends into the first trapezoidal cavity and the second trapezoidal metal waveguide, the upper end face and the lower end face of the second TEM-TE01 mode conversion power divider are in contact with the lower end face of the first upper plate and the upper end face of the second trapezoidal metal waveguide respectively, the two output ends of the one-to-two strip line power divider are connected with the first TEM-TE01 mode conversion power divider and the second TEM-TE01 mode conversion power divider respectively, a microstrip line to strip line conversion structure includes a coaxial SMA head, a rectangular microstrip line and two groups of metal columns, the left end face of the first left plate, the part of the second trapezoidal metal waveguide which is a mirror image of the first left plate and the left end face of the rectangular dielectric plate form a hexagon, the coaxial SMA head is installed at the center of the hexagon, the rectangular microstrip line is attached to the upper surface of the rectangular dielectric plate and is in contact with the first bottom plate, the front end face of the rectangular microstrip line is parallel to the plane in which the front end face of the rectangular dielectric plate lies, the left end face is connected with the coaxial SMA head, the right end face is connected with the input end of the one-to-two strip line power divider, the two groups of metal columns respectively include n metal cylinders, n is an integer greater than or equal to 6, the two groups of metal columns are referred to as the first group of metal columns and the second group of metal columns, in the first group of metal columns, the n metal cylinders are uniformly distributed in order from left to right and penetrate the rectangular dielectric plate from top to bottom, part of the metal cylinders in the first group of metal columns are located on the front side of the rectangular microstrip line, and the other part of the metal cylinders are located on the front side of the input end of the one-to-two strip line power divider, the n metal cylinders in the second group of metal columns are uniformly distributed in order from left to right and penetrate the rectangular dielectric plate from top to bottom, part of the metal cylinders in the second group of metal columns are located on the back side of the rectangular microstrip line, and the other part of the metal cylinders are located on the back side of the input end of the one-to-two strip line power divider, the n metal cylinders in the first group of metal columns and the n metal cylinders in the second group of metal columns are aligned front and back one by one.

2. The high gain omni-directional antenna based on trapezoidal ridge waveguide according to claim 1, characterized in that The first TEM-TE01 mode conversion power splitter and the second TEM-TE01 mode conversion power splitter are both implemented with two metal cylinders. The first TEM-TE01 mode conversion power splitter and the second TEM-TE01 mode conversion power splitter are both implemented with two metal cylinders.

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