A broadband dual-polarized corrugated horn antenna based on high-frequency choke groove

Abstract

A broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot includes a composite curved arm horn antenna, an aperture-shaped reverse quadrangular ridge, and a high-frequency choke slot. The composite curved arm horn antenna is composed of a bottom circular waveguide section, a curved section, and an aperture-shaped circular waveguide section connected together. The inner and outer radii of the curved section gradually increase along the direction from the bottom to the aperture. The aperture-shaped reverse quadrangular ridge is coaxially arranged in the composite curved arm horn antenna and is a cross-shaped structure composed of four ridge plates spliced ​​together. The outer ridge line of each ridge plate varies with a modified exponential function, which ensures that the top surface of the aperture-shaped reverse quadrangular ridge is square. The thickness of each ridge plate gradually widens from the inside to the outside, i.e., along the direction from the bottom to the aperture, and each ridge plate has a fine rectangular hole. The high-frequency choke slot is an axial annular groove engraved on the wall thickness of the aperture of the composite curved arm horn antenna. This invention improves the high-frequency radiation pattern of the reverse quadrangular horn antenna while increasing the bandwidth of the horn antenna.

Description

Technical Field

[0001] This invention belongs to the field of antenna technology, and specifically relates to a broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot, which can be used as a feed source for a compact field measurement system. Background Technology

[0002] Compact field testing is a crucial method for antenna testing, providing a high-performance plane wave test area at close range. Electrical design is the core technology of compact field testing, encompassing feed design, aperture design, and edge design. The level of electrical design has a comprehensive and fundamental impact on the quality of the compact field, with feed performance having a significant influence on its overall performance during the design process. Currently, compact field feeds are evolving towards broadband, wide beamwidth, low cross-polarization, stable half-power beamwidth, and symmetrical radiation patterns. In broadband testing, broadband feeds reduce the frequency of feed replacements, avoiding issues such as decreased test accuracy due to feed changes.

[0003] Quad-ridged horn antennas have been extensively studied due to their broadband characteristics. However, the asymmetry of the ridge waveguide feed structure leads to poor port consistency, and the cross-polarization of ridged horn antennas is typically around -20dB, which cannot meet the requirements of some demanding measurement environments. Furthermore, due to their inherent structural characteristics, quad-ridged horn antennas are prone to asymmetry in their high-frequency radiation patterns, and their gain fluctuates excessively within the frequency band, significantly impacting the overall test quality in compact fields. In existing technologies, antennas that solely use ridges to enhance feed bandwidth struggle to guarantee both broadband performance and excellent radiation characteristics.

[0004] In their paper "A Balanced Feed Quad-Ridged Horn Antenna," published at the 13th European Conference on Antennas and Propagation (EuCAP) in 2019, Zhihao Zhao et al. disclosed a feed antenna for small compact field testing or satellite reflector antennas. The feed antenna employs a symmetrical four-ridge structure, with a balanced feed network compensating for errors caused by structural asymmetry, and can operate from 2 GHz to 6 GHz. Its bandwidth is wider than that of a standard horn antenna, with an in-band voltage standing wave ratio (VSWR) of less than 2 and cross-polarization discrimination greater than 40 dB. As a dual-polarized broadband antenna, it exhibits good cross-polarization discrimination; however, the half-power beamwidth variation in its in-band radiation pattern is too large, and the in-band VSWR is high, requiring further improvement. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention aims to provide a broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot. This primarily addresses the problems of narrow bandwidth, unstable half-power beamwidth, and low cross-polarization discrimination in existing compact field feed systems, thereby improving the overall test performance of the compact field test system by enhancing feed performance. The designed broadband dual-polarized corrugated horn antenna, within the frequency range of 8 GHz to 18 GHz, ensures high isolation, high cross-polarization discrimination, and stable half-power beamwidth while also increasing the antenna's operating bandwidth.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot includes a composite curved arm horn antenna, an open-aperture reverse quadrilateral ridge, and a high-frequency choke slot.

[0008] The composite curved arm horn antenna is composed of a bottom circular waveguide segment, a curved segment, and an aperture circular waveguide segment connected together; the inner and outer radii of the curved segment gradually increase along the direction from the bottom to the aperture.

[0009] The four-ridged, reverse-opening structure is coaxially arranged in the composite curved arm horn antenna and is a cross-shaped structure composed of four ridge plates spliced ​​together. The outer ridge line of each ridge plate changes with a correction exponential function, which ensures that the top surface of the four-ridged, reverse-opening structure is square. The thickness of each ridge plate gradually increases from the inside to the outside, that is, from the bottom to the opening, and each ridge plate has a fine rectangular hole.

[0010] The high-frequency choke slot is an axial annular groove engraved on the wall thickness of the aperture surface of the composite curved arm horn antenna.

[0011] In one embodiment, the bottom circular waveguide segment is cylindrical with one end open and the other end closed; the aperture circular waveguide segment is cylindrical with both ends open; both ends of the curved segment are open, the open port of the bottom circular waveguide segment is connected to the smaller aperture port of the curved segment, and the larger aperture port of the curved segment is connected to one of the open ports of the aperture circular waveguide segment.

[0012] In one embodiment, the curved segment is an exponential function-type curved wall, with both the inner and outer walls exhibiting exponential function variations. If the antenna axis is taken as the z-direction, the functional expression of the yoz plane of the curved segment is:

[0013]

[0014] Among them, the value of parameter g1 is between 0.02 and 0.03, and the value of parameter k1 is between 0.09 and 0.11.

[0015] In one embodiment, the bottom of the perforated reverse quadrilateral is fixed to the center of the bottom circular waveguide section by a rectangular support block, and a quadrangular pyramid is provided on the top surface of the perforated reverse quadrilateral, the center of the quadrangular pyramid being coincident with the center of the perforated reverse quadrilateral.

[0016] In one embodiment, the ratio of the axial length of the reverse quadrangular ridge of the aperture to the axial length of the composite curve arm horn antenna is between 0.86 and 0.95, and the distance between the outer ridge and the inner wall of the composite curve arm horn antenna gradually increases from 0.82 mm to 9.85 mm.

[0017] In one embodiment, the thickness of the ridge plate is widest at the radiating aperture of the circular waveguide section and narrowest at the bottom, and the functional expression of the outer ridge line of each ridge plate is:

[0018]

[0019] Wherein, the value of parameter g2 is between 0.01 and 0.015, the value of parameter k2 is between 0.01 and 0.015, and K is a correction factor.

[0020] In one embodiment, each ridge plate has two thin rectangular holes located at different axial positions, and the long side h2 of the thin rectangular holes is between 0.23λ. min ~0.25λ min Between these values, the shorter side w7 takes a value between 0.025λ. min ~0.04λ min Between, where λ min It is the minimum wavelength within the operating frequency band.

[0021] In one embodiment, a plurality of axial corrugated grooves are provided on the edge of the opening face of the composite curved arm horn antenna. The axial corrugated grooves are formed by a plurality of annular intervals with gradually increasing radii from the inside to the outside, and the depth and height of each axial corrugated groove are different.

[0022] In one embodiment, the sidewall of the bottom circular waveguide section has a circular hole, through which the inner core of the feed coaxial line passes into the interior of the composite curved arm horn antenna and is structurally connected to the four ridges with the opening.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] First, this invention functionalizes the outer wall of the circular waveguide aperture waveguide antenna, forming a composite function wall composed of two circular waveguide walls and a curved arm. The intermediate curved arm plays a significant role in smoothing the internal impedance transition of the broadband dual-polarized corrugated horn antenna, thereby reducing the voltage standing wave ratio (VSWR). The circular waveguide wall at the aperture ensures relatively uniform current at the aperture of the broadband dual-polarized corrugated horn antenna, maximizing the improvement of the radiation pattern.

[0025] Secondly, this invention increases the ridge thickness of the central reverse quadrilateral by varying the wall thickness of the ridges. This increases the ridge thickness, which is equivalent to increasing the radiating aperture, effectively improving the gain of the broadband dual-polarized corrugated horn antenna at high frequencies. Furthermore, the addition of the ridges lowers the operating frequency of the main mode and increases the bandwidth of the dual-polarized corrugated horn antenna. At the bottom of the central reverse quadrilateral are eight fine rectangular holes, two on each ridge. Electromagnetic waves undergo multiple reflections on the inner surface of these holes. Through proper optimization, this improves the antenna's return loss and isolation.

[0026] Third, the high-frequency choke groove formed by grooving the aperture wall thickness of the composite curved arm horn antenna can suppress the current at high frequencies, increase the high-frequency current suppression structure, and make the aperture current intensity relatively uniform around the perimeter when the dual-polarized corrugated horn antenna is working at high frequencies, thereby making the overlap between the E-plane and H-plane of the high-frequency radiation pattern better.

[0027] This invention, based on a composite curved arm horn antenna, features an outwardly widening, reverse-southwest quadrangular ridge, axial corrugated slots, a high-frequency choke slot, a rectangular support block, and a coaxial feed line. It achieves a broadband dual-polarized corrugated horn antenna with stable half-power beamwidth, high port isolation, and high cross-polarization discrimination. Within the 8GHz–18GHz range, the voltage standing wave ratio is less than 1.5, port isolation is greater than 48dB, cross-polarization discrimination is greater than 40dB, and the gain is stable within the 9.7–11.6dBi range. The difference in half-power beamwidth between the E and H planes within the frequency band is stable within 7.5°, making it highly effective in compact field testing. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 This is a longitudinal section of the outer wall of the structure of the present invention and a structural schematic diagram of the rectangular support block, wherein (a) is a cross-sectional view and (b) is a perspective view.

[0030] Figure 3 This is a schematic diagram of the longitudinal section of the reverse four ridges with varying ridge thickness and widening, and the narrow rectangular hole at the bottom of the ridges of the present invention, wherein (a) is a front view and (b) is a top view.

[0031] Figure 4 This is a schematic diagram of the longitudinal cross-section of the axial corrugated groove and the high-frequency choke groove of the present invention.

[0032] Figure 5 This is a schematic diagram of the simulation results of the voltage standing wave ratio parameter curve of the present invention.

[0033] Figure 6This is a schematic diagram of the simulation results of the gain versus frequency curve of the present invention.

[0034] Figure 7 yes Figure 1 The diagram shows the curves of the half-power beamwidth of the E-plane and H-plane as a function of frequency when the broadband dual-polarized corrugated horn antenna is excited by x-polarization.

[0035] Figure 8 yes Figure 1 The diagram shows the main polarization and cross-polarization patterns of the E-plane of the broadband dual-polarized corrugated horn antenna at different frequencies under x-polarization excitation.

[0036] Figure 9 yes Figure 1 The diagram shows the main polarization and cross-polarization patterns of the H-plane of the broadband dual-polarized corrugated horn antenna at different frequencies under x-polarization excitation.

[0037] Figure 10 This is a schematic diagram of the simulation results of the input port isolation degree as a function of frequency according to the present invention.

[0038] Figure 11 This is the polar coordinate pattern of the E-plane and H-plane of the present invention at 8GHz, 13GHz, and 18GHz. Detailed Implementation

[0039] To make the objectives, features and advantages of the present invention more apparent and understandable, the invention will be further described in detail below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the invention in any way.

[0040] The broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot in this embodiment operates in the X and K frequency bands. Specifically, refer to... Figure 1 It mainly includes a composite curve arm horn antenna 1, an open-aperture reverse quadrilateral ridge 2, and a high-frequency choke slot 4. To better illustrate the internal structure of the horn antenna of this application, Figure 1 It employs perspective drawing techniques.

[0041] Please see Figure 2 The composite curved arm horn antenna 1 is composed of a bottom circular waveguide section 11, a curved section 12, and an aperture circular waveguide section 13 connected together. The curved section 12 has gradually increasing inner and outer radii along the direction from the bottom to the aperture. This structural connection of two circular waveguide sections (i.e., the bottom circular waveguide section 11 and the aperture circular waveguide section 13) and one curved section (i.e., the curved section 12) significantly reduces the voltage standing wave ratio (VSWR) of the composite curved arm horn antenna 1.

[0042] Please see Figure 3The four ridges 2 with apertures are coaxially arranged in the composite curved arm horn antenna 1. They are cross-shaped structures composed of four ridge plates 22 spliced ​​together. The outer ridge line of each ridge plate 22 varies with a correction exponential function, which ensures that the top surface of the four ridges 2 with apertures is square. The thickness of each ridge plate 22 gradually widens from the inside out, i.e., from the bottom towards the aperture, and each ridge plate 22 has a fine rectangular hole 21. By increasing the thickness of the ridges at the aperture and opening the bottom ridges, the high-frequency gain and port isolation can be effectively improved.

[0043] The high-frequency choke slot 4 is an axial annular slot etched into the aperture wall thickness of the composite curved arm horn antenna 1. Specifically, a ring is carved out at the location corresponding to the aperture wall thickness, and the high-frequency choke slot 4 is preferably located in the exact center of the aperture wall thickness. The etched high-frequency choke slot 4 can suppress the current at high frequencies, improving the high-frequency aperture current distribution. Adding a high-frequency current suppression structure ensures that the aperture current intensity is relatively uniform around the perimeter at high frequencies, thereby improving the overlap between the E-plane and H-plane of the high-frequency radiation pattern, thus improving the high-frequency radiation pattern.

[0044] The bottom circular waveguide section 11 has a circular hole 110 on its side wall. The inner core of the feed coaxial line 6 passes through the circular hole 110 and enters the interior of the composite curve arm horn antenna 1, where it is structurally connected to the opening reverse quad ridge 2.

[0045] Please refer to it again. Figure 2 In some embodiments of the present invention, the bottom circular waveguide segment 11 is cylindrical, open at one end and closed at the other. The aperture circular waveguide segment 13 is also cylindrical, but open at both ends. The curved segment 12 is formed by gradually increasing radius similar to a circular waveguide, and is open at both ends. The bottom circular waveguide segment 11 is connected to the smaller aperture port of the curved segment 12 through its open port, and the larger aperture port of the curved segment 12 is connected to one open port of the aperture circular waveguide segment 13. For example, according to... Figure 2 As indicated, this embodiment also provides preferred dimensional parameters: the length of the bottom circular waveguide section 11 is h5 = 6.2 mm, the diameter of the bottom circular waveguide section 11 is r1 = 8.8 mm, the length of the curved section 12 is h4 = 46 mm, the length of the aperture circular waveguide section 13 is h3 = 7.8 mm, and the diameter of the aperture circular waveguide section 13 is r2 = 11.6 mm.

[0046] In some embodiments of the present invention, curve segment 12 is an exponential function curve wall, with both the inner and outer walls exhibiting exponential function variations. If the antenna axis is taken as the z-direction, the function expression of the yoz plane of curve segment 12 is:

[0047]

[0048] Wherein, g1 and k1 are both constant parameters. Specifically, the value of parameter g1 is between 0.02 and 0.03, and the value of parameter k1 is between 0.09 and 0.11.

[0049] Please refer to it again. Figure 2 and Figure 3 In some embodiments of the present invention, the four ridge plates constituting the aperture-reverse quadrangular ridge 2 are similar in shape to triangles. The aperture-reverse quadrangular ridge 2 is fixed to the center of the bottom circular waveguide section 11 by rectangular support blocks 5. The thickness of each ridge plate 22 is widest at the horn aperture face, used to adjust the high-frequency radiation aperture face, and narrowest near the bottom support block. A quadrangular pyramid 23 is provided on the top surface of the aperture-reverse quadrangular ridge 2, and the center of the quadrangular pyramid 23 coincides with the center of the aperture-reverse quadrangular ridge 2. The square face at the bottom of the quadrangular pyramid 23 is tightly fitted with the square face at the top of the aperture-reverse quadrangular ridge 2, which widens outward. In the present invention, the ratio of the axial length of the aperture-reverse quadrangular ridge 2 to the axial length of the composite curve arm horn antenna 1 is between 0.86 and 0.95, and the distance between its outer ridge line and the inner wall of the composite curve arm horn antenna 1 gradually increases from 0.82 mm to 9.85 mm. For example, according to Figure 3 As indicated, this embodiment also provides preferred dimensional parameters: minimum ridge width w6 = 2.4 mm, maximum ridge width w5 = 3.5 mm, total length of the reverse four ridges 2 with opening h1 = 54.5 mm, and width of the bottom of the longitudinal section of the reverse four ridges 2 with opening w8 = 16 mm.

[0050] In this embodiment of the invention, the thickness of the ridge plate 22 is widest at the radiating aperture of the circular waveguide section 13 and narrowest at the bottom. The functional expression of the outer ridge line of each ridge plate 22 is as follows:

[0051]

[0052] Where g2 and k2 are constants, and K is a correction factor. Specifically, the value of parameter g2 is between 0.01 and 0.015, and the value of parameter k2 is between 0.01 and 0.015.

[0053] This invention functionalizes the circular waveguide wall on the basis of a circular aperture waveguide antenna, using an exponential function wall to replace the circular waveguide wall, and employing an exponential curve with a correction factor as the ridge curve of the inverse four ridges, thereby increasing the width of the ridges at the aperture, which can effectively change the size of the radiation aperture and improve the high-frequency gain within the frequency band. Furthermore, due to the gradual increase in ridge thickness and the effect of the exponential function wall, the impedance at the feed coaxial line can smoothly transition to free space impedance, greatly improving the antenna bandwidth and reducing the voltage standing wave ratio.

[0054] Please see Figure 3In one embodiment of the present invention, there are eight fine rectangular holes 21 at the bottom end of the ridge plate 22 of the reverse quadrangular ridge 2, that is, there are two fine rectangular holes 21 on each ridge plate 22. The fine rectangular holes 21 are generally located below the ridge plate 22, and their positions are rotationally symmetrical with respect to each ridge plate 22. The two fine rectangular holes 21 are located at different heights on a ridge plate 22, that is, at different axial positions. The gap between the fine rectangular holes 21 and the ridge plate 22 forms a cavity. Electromagnetic waves are reflected multiple times on the surface of the cavity. Through reasonable optimization, the return loss and isolation of the antenna can be improved. In this embodiment, the long side of the fine rectangular hole 21, i.e., the height h2, should be 0.23λ. min ~0.25λ min Between these values, the shorter side, i.e., the width w7, should be within 0.025λ. min ~0.04λ min Between, where λ min This refers to the minimum wavelength within the operating frequency band. In this embodiment, h2 = 3.9 mm and w7 = 0.5 mm are preferably selected.

[0055] Please see Figure 4 In one embodiment of the present invention, axial corrugated grooves 3 surround the edge of the opening surface of the composite curve arm horn antenna 1, and there are multiple such grooves, which are formed by annular intervals with gradually increasing radii from the inside to the outside. The innermost groove 33 is formed by the outer wall of the composite curve arm horn antenna 1 and the innermost annular interval. Figure 4 Three axial grooves are shown: the innermost groove 33, the middle groove 32, and the outermost groove 31. The middle groove 32 is formed by an innermost ring and a middle ring spaced apart. The outermost groove 31 is formed by an outermost ring and a middle ring spaced apart. For example, according to... Figure 4 As indicated, this embodiment also provides preferred dimensional parameters: the height d1 of the outermost groove 31 is 9.6 mm, the width w4 of the outermost groove 31 is 2.4 mm, the height d2 of the middle groove 32 is 9.4 mm, the width w3 of the middle groove 32 is 2.3 mm, the height d3 of the innermost groove 33 is 9.7 mm, and the width w2 of the innermost groove 33 is 3.4 mm.

[0056] In this embodiment, the axial corrugated slot 3 can effectively change the antenna's radiating aperture, improve cross-polarization discrimination, and stabilize the gain within the frequency band. The use of differential feeding at the feed point minimizes the radiation impact between coaxial line ports, suppressing the generation of higher-order modes and thus improving port isolation.

[0057] Please see Figure 4 In one embodiment of the present invention, preferred dimensional parameters are also provided: the height of the high-frequency choke groove 4 is d4 = 3.4 mm and the width is w1 = 0.5 mm.

[0058] The broadband dual-polarized corrugated horn antenna based on a high-frequency choke provided in this application was simulated using simulation software. The simulation results are as follows: Figures 5 to 11 As shown.

[0059] Please see Figure 5 This is a curve showing the voltage standing wave ratio (VSWR) of a dual-polarized antenna as a function of frequency. The broadband dual-polarized corrugated horn antenna of this application operates in the frequency band of 8 GHz to 18 GHz, with an in-band VSWR of less than 1.5. The VSWR is reduced by curving the horn wall.

[0060] Please see Figure 6 This is the curve showing the gain versus frequency for x-polarization and y-polarization. The minimum gain of this application is 9.7 dBi, and the maximum gain is 11.6 dBi in the 8 GHz to 18 GHz frequency band. The addition of axial corrugated slots and high-frequency choke slots makes the gain fluctuation with frequency changes within the frequency band smoother, resulting in good gain stability.

[0061] Please see Figure 7 The figure shows the curves of the half-power beamwidth of the E-plane and H-plane of a broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot under x-polarization excitation. In the range of 8 GHz to 18 GHz, the half-power beamwidth of the E-plane is between 52.64° and 60.11°, and the half-power beamwidth of the H-plane is between 57.19° and 61.78°. The half-power beamwidth is very stable in both the E-plane and H-plane.

[0062] Please see Figure 8 and Figure 9 This embodiment shows the main polarization and cross-polarization patterns of the E-plane and H-plane of a broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot at different frequencies under x-polarization excitation. The main polarization directions of the E-plane and H-plane at different frequencies are shown within the range of 8 GHz to 18 GHz. Figure 1 The consistency is good, and the cross-polarization discrimination of the E-plane and H-plane is higher than 40dB.

[0063] Please see Figure 10 This is a curve showing the input port isolation as a function of frequency. This application achieves an input port isolation greater than 48 dB in the 8 GHz to 18 GHz band, which is superior to the existing minimum port isolation specification of 20 dB for quad-ridged horn antennas.

[0064] Please see Figure 11 The image shows the polar coordinate radiation pattern of a broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot in this embodiment when excited by x-polarization. When the frequency is 8GHz, 13GHz, and 18GHz, the radiation patterns of the antenna's E-plane and H-plane have good overlap.

[0065] In summary, the broadband dual-polarized corrugated horn antenna of this invention, by functionalizing the circular waveguide wall based on a circular aperture waveguide antenna, uses exponential function walls to replace the circular waveguide wall and employs an exponential curve with a correction factor as the ridge curve of the inverted quad ridges. This increases the width of the ridges at the aperture, effectively changing the size of the radiating aperture and improving the high-frequency gain within the frequency band. Furthermore, due to the gradual widening of the ridge thickness and the effect of the exponential function walls, the impedance at the feed coaxial line transitions smoothly to free-space impedance, greatly increasing the antenna bandwidth and reducing the voltage standing wave ratio (VSWR). Eight fine rectangular holes are formed at the bottom of the inverted quad ridges, with two small rectangular holes on each ridge plate. The gaps between the small rectangular holes and the ridge plate form a cavity, where electromagnetic waves undergo multiple reflections on the cavity surface. Through proper optimization, this improves the antenna's VSWR and isolation. The high-frequency choke slot formed by grooving grooves on the aperture wall thickness of the composite curve arm horn antenna can suppress the current at high frequencies, increase the high-frequency current suppression structure, and make the aperture current intensity relatively uniform around the perimeter at high frequencies, thereby making the overlap between the E-plane and H-plane of the high-frequency radiation pattern better.

[0066] In summary, this invention improves the high-frequency radiation pattern of the reverse quad-ridge horn antenna while increasing the bandwidth of the horn antenna. It also features high port isolation, high cross-polarization discrimination, and stable half-power beamwidth within the frequency band.

[0067] The foregoing has provided a detailed description of a broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot, and has illustrated and implemented the principles and methods of the invention through detailed structural design. The descriptions of the embodiments above are merely illustrative of the method and core ideas of the invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the invention, and these improvements and modifications should also be considered within the scope of protection of the invention.

Claims

1. A broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot, characterized in that, It includes a composite curve arm horn antenna (1), an open-aperture reverse quad ridge (2), and a high-frequency choke slot (4). The composite curved arm horn antenna (1) is composed of a bottom circular waveguide section (11), a curved section (12), and an aperture circular waveguide section (13). The curved section (12) gradually increases in both its inner and outer radii along the direction from the bottom to the aperture, forming an exponential function-type curved wall. Both the inner and outer walls exhibit exponential function changes. If the antenna axis is taken as the z-direction, the function expression of the yoz plane of the curved section (12) is: Among them, the value of parameter g1 is between 0.02 and 0.03, and the value of parameter k1 is between 0.09 and 0.11; The perforated reverse quad ridge (2) is coaxially arranged in the composite curved arm horn antenna (1), and is a cross-shaped structure composed of four ridge plates (22) spliced ​​together; the outer ridge line of each ridge plate (22) changes with the correction exponential function, and the correction exponential function ensures that the top surface of the perforated reverse quad ridge (2) is square; the thickness of each ridge plate (22) gradually widens from the inside to the outside, that is, along the direction from the bottom to the opening, and each ridge plate (22) has a fine rectangular hole (21). The high-frequency choke slot (4) is an axial annular slot engraved on the wall thickness of the aperture of the composite curved arm horn antenna (1).

2. The broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot according to claim 1, characterized in that, The bottom circular waveguide segment (11) is cylindrical with one end open and the other end closed; the aperture circular waveguide segment (13) is cylindrical with both ends open; the curved segment (12) is open at both ends, the opening port of the bottom circular waveguide segment (11) is connected to the opening port of the curved segment (12) with a smaller aperture radius, and the opening port of the curved segment (12) with a larger aperture radius is connected to one opening port of the aperture circular waveguide segment (13).

3. The broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot according to claim 1, characterized in that, The bottom of the perforated reverse quadrilateral (2) is fixed to the center of the bottom circular waveguide section (11) by a rectangular support block (5). The top surface of the perforated reverse quadrilateral (2) is provided with a quadrangular vertebra (23), and the center of the quadrangular vertebra (23) coincides with the center of the perforated reverse quadrilateral (2).

4. The broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot according to claim 1, characterized in that, The ratio of the axial length of the reverse quadrangular ridge (2) to the axial length of the composite curve arm horn antenna (1) is between 0.86 and 0.95, and the distance between its outer ridge line and the inner wall of the composite curve arm horn antenna (1) gradually increases from 0.82 mm to 9.85 mm.

5. The broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot according to claim 1, characterized in that, The thickness of the ridge plate (22) is widest at the radiating aperture of the circular waveguide section (13) and narrowest at the bottom. The functional expression of the outer ridge line of each ridge plate (22) is as follows: Among them, the value of parameter g2 is between 0.01 and 0.015, and the value of parameter k2 is between 0.01 and 0.

015. K This is a correction factor.

6. The broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot according to claim 1, characterized in that, Each of the ridge plates (22) has two small rectangular holes (21) located at different axial positions, and the long side h2 of the small rectangular holes takes the value of Between, the value of the shorter side w7 is in Between, among It is the minimum wavelength within the operating frequency band.

7. The broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot according to claim 1, characterized in that, A plurality of axial corrugated grooves (3) are provided on the edge of the opening face of the composite curve arm horn antenna (1). The axial corrugated grooves (3) are formed by a plurality of circular rings with gradually increasing radii from the inside to the outside.

8. The broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot according to claim 7, characterized in that, The depth and height of each of the axial corrugated grooves (3) are different.

9. The broadband dual-polarized corrugated horn antenna based on a high-frequency choke slot according to claim 1, characterized in that, The bottom circular waveguide section (11) has a circular hole (110) on its side wall. The inner core of the feed coaxial line (6) passes through the circular hole (110) and enters the interior of the composite curve arm horn antenna (1), and is structurally connected with the opening reverse quad ridge (2).

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