CN116315614A - Broadband dual-polarized corrugated horn antenna based on high-frequency choke groove - Google Patents
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- H—ELECTRICITY
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- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
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- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/06—Waveguide mouths
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
- H01Q15/242—Polarisation converters
- H01Q15/244—Polarisation converters converting a linear polarised wave into a circular polarised wave
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
A broadband dual-polarized corrugated horn antenna based on a high-frequency choke groove comprises a compound curve arm horn antenna, an open reverse four-ridge and the high-frequency choke groove; the composite curve arm horn antenna is formed by connecting a bottom circular waveguide section, a curve section and an opening surface circular waveguide section; the inner and outer radiuses of the curve section are gradually increased along the direction from the bottom to the mouth surface; the perforated reverse four ridges are coaxially arranged in the horn antenna with the composite curve arm and are of a structure formed by splicing four ridge plates, and the cross section of the structure is cross-shaped; the outer ridge line of each ridge plate changes along with a correction index function, and the correction index function ensures that the ridge top surface of the reverse four ridges of the open pore is square; the thickness of each ridge plate is gradually widened from inside to outside, namely along the direction from the bottom to the mouth surface, and each ridge plate is provided with a thin rectangular hole; the high-frequency choke groove is an axial circular groove carved on the wall thickness of the horn antenna mouth surface of the compound curve arm. The invention improves the high-frequency radiation pattern of the reverse four-ridge horn antenna while improving the bandwidth of the horn antenna.
Description
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to a broadband dual-polarized corrugated horn antenna based on a high-frequency choke groove, which can be used as a feed source of a compact range measurement system.
Background
Compact range is an important means of antenna testing that provides a plane wave test zone of good performance over close distances. Electrical design is a core technology of compact range, and includes contents such as feed source design, mouth surface design, edge design and the like, and the quality influence of the electrical design on the compact range is global and fundamental, wherein the performance of the feed source has a great influence on the performance of the compact range in the design process of the compact range. Compact feeds are currently evolving towards broadband, wide beam, low cross polarization, stable half power lobe width, symmetrical radiation patterns. In the broadband test, the broadband feed source can reduce the frequency of replacing the feed source, and the problems of test precision reduction and the like caused by replacing the feed source are avoided.
The four-ridge horn antenna is widely studied due to the broadband characteristic, but due to the asymmetry of a ridge waveguide feed structure, the consistency among ports is poor, the cross polarization of the four-ridge horn antenna is generally about-20 dB, and the situation that certain measurement environments have higher requirements cannot be met. And the four-ridge horn antenna is easy to be asymmetric in a high-frequency radiation pattern due to the structural characteristic of the four-ridge horn antenna, and the gain in a frequency band floats too much, so that the whole testing quality of a compact range is greatly influenced. In the prior art, an antenna which uses a ridge alone to raise the bandwidth of a feed source is difficult to ensure that the radiation characteristic of the antenna is excellent while the antenna is broadband.
In A Balanced Feed Quad-Ridged Horn Antenna published by Zhihao Zhao et al in 2019 13th European Conference on Antennas and Propagation (EuCAP) conference in 2019, a feed antenna for a small compact range test or satellite reflection antenna is disclosed, wherein the feed antenna adopts a symmetrical four-ridge structure, and errors caused by structural asymmetry are reduced by a compensation structure with a balanced feed network, so that the feed antenna can work at 2-6 GHz. The bandwidth is wider than that of a standard horn antenna, the in-band voltage standing wave ratio is smaller than 2, and the cross polarization discrimination is larger than 40dB. As a dual polarized broadband antenna which has good cross polarization discrimination but whose in-band radiation pattern half power lobe width varies too much, in-band voltage standing waves are relatively high, improvements are needed in this regard.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a broadband dual-polarized corrugated horn antenna based on a high-frequency choke groove, which mainly solves the problems of narrow bandwidth, unstable half-power lobe width, low cross polarization discrimination and the like of the existing compact field feed source, and improves the test performance of the whole compact field test system from the perspective of improving the feed source performance. The designed broadband dual-polarized corrugated horn antenna ensures high isolation, high cross polarization discrimination and stable half-power lobe width in the frequency range of 8 GHz-18 GHz, and improves the working bandwidth of the antenna.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a broadband dual-polarized corrugated horn antenna based on a high-frequency choke groove comprises a compound curve arm horn antenna, an open reverse four-ridge and the high-frequency choke groove;
the composite curve arm horn antenna is formed by connecting a bottom circular waveguide section, a curve section and an opening surface circular waveguide section; the inner radius and the outer radius of the curve section are gradually increased along the direction from the bottom to the mouth surface;
the perforated reverse four ridges are coaxially arranged in the compound curve arm horn antenna and are of a structure formed by splicing four ridge plates, and the cross section of the structure is cross-shaped; the outer ridge line of each ridge plate changes along with a correction index function, and the correction index function ensures that the ridge top surface of the reverse four ridges of the open hole is square; the thickness of each ridge plate is gradually widened from inside to outside, namely along the direction from the bottom to the mouth surface, and each ridge plate is provided with a thin rectangular hole;
the high-frequency choke groove is an axial circular groove carved on the wall thickness of the horn antenna mouth surface of the compound curve arm.
In one embodiment, the bottom circular waveguide section is cylindrical, open at one end and closed at one end; the circular waveguide section of the mouth surface is cylindrical, and two ends of the circular waveguide section are open; and the two ends of the curve section are both open, and the open port of the bottom circular waveguide section is connected with the open port with small radius of the opening surface of the curve section, and the open port with large radius of the opening surface of the curve section is connected with one open port of the circular waveguide section of the opening port connection port surface.
In one embodiment, the curve segment is an exponential function type curve wall, the inner wall and the outer wall are all in exponential function change, and if the axial direction of the antenna is z-direction, the function expression of the yoz surface of the curve segment is:
wherein the parameter g 1 The value is between 0.02 and 0.03, and the parameter k is 1 The value is between 0.09 and 0.11.
In one embodiment, the bottom of the open-pore reverse four-ridge is fixed at the center of the bottom circular waveguide section through a rectangular supporting block, the ridge top surface of the open-pore reverse four-ridge is provided with a four-pyramid body, and the center of the four-pyramid body coincides with the center of the open-pore reverse four-ridge.
In one embodiment, the ratio of the axial length of the reverse four ridges of the opening to the axial length of the horn antenna of the compound curve arm is between 0.86 and 0.95, and the distance between the outer ridge line of the reverse four ridges and the inner wall of the horn antenna of the compound curve arm is gradually increased from 0.82mm to 9.85mm.
In one embodiment, the thickness of the ridge plate is widest at the radiation port of the circular waveguide section with the mouth surface and the bottom is narrowest, and the function expression of the outer ridge line of each ridge plate is as follows:
wherein the parameter g 2 The value is between 0.01 and 0.015, and the parameter k 2 The value is between 0.01 and 0.015, and K is a correction factor.
In one embodiment, each ridge plate is provided with two thin rectangular holes positioned at different axial positions, and the long sides h of the thin rectangular holes 2 Take the value of 0.23 lambda min ～0.25λ min Between short sides w 7 Take the value of 0.025 lambda min ～0.04λ min Wherein lambda is min Is the smallest wavelength within the operating band.
In one embodiment, a plurality of axial corrugated grooves are arranged on the edge of the opening surface of the compound curve arm horn antenna, the axial corrugated grooves are formed by a plurality of annular spaces with gradually increased radius from inside to outside, and the depth and the height of each axial corrugated groove are different.
In one embodiment, a circular hole is formed in the side wall of the bottom circular waveguide section, and an inner core of the feeding coaxial line penetrates through the circular hole to enter the inside of the compound curve arm horn antenna and is structurally connected with the open hole reverse four ridges.
Compared with the prior art, the invention has the beneficial effects that:
firstly, the invention forms a composite function wall by two sections of circular waveguide walls and one section of curve arm through the treatment of functionalization on the outer wall of the circular waveguide open-ended waveguide antenna. The middle curve arm has great effect on the gentle transition of the internal impedance of the broadband dual-polarized corrugated horn antenna, and can reduce the voltage standing wave ratio. The circular waveguide wall of the port surface can enable the current at the port surface of the broadband dual-polarized corrugated horn antenna to be relatively uniform, and the radiation pattern is improved to the greatest extent.
Second, the invention changes the wall thickness of the central reverse four ridges, and the difference between the wall thickness of the central reverse four ridges and the reduction of the ridge thickness of the conventional mouth surface is that the ridge thickness of the mouth surface is increased, and the increase of the ridge thickness is equivalent to the increase of the radiation mouth surface, so that the gain of the broadband dual-polarized corrugated horn antenna at high frequency can be effectively improved, the working frequency of a main mode is reduced due to the addition of the ridges, and the bandwidth of the dual-polarized corrugated horn antenna is also improved. Eight thin rectangular holes are formed in the bottommost end of the central reverse four ridges, two thin rectangular holes are formed in each ridge plate, electromagnetic waves are reflected on the inner surfaces of the holes for multiple times, and through reasonable optimization, the return loss and isolation of the antenna can be improved.
Thirdly, the high-frequency choke groove formed by grooving on the wall thickness of the mouth surface of the horn antenna with the compound curve arm can choke the current at a high frequency, and a high-frequency current choke structure is added, so that the current intensity of the mouth surface is relatively uniform around when the dual-polarized corrugated horn antenna works at the high frequency, and the coincidence degree of the E surface and the H surface of the high-frequency radiation pattern is good.
The invention is based on the design of the composite curve arm horn antenna, the outwards widened open-pore reverse four ridges, the axial corrugated groove, the high-frequency choke groove, the rectangular supporting block and the feeding coaxial line, and realizes the broadband dual-polarized corrugated horn antenna with stable broadband and half-power lobe width, high port isolation and high cross polarization discrimination, the voltage standing wave ratio is smaller than 1.5 in the range of 8 GHz-18 GHz, the port isolation is larger than 48dB, the cross polarization discrimination is larger than 40dB, the gain is stable in the range of 9.7-11.6 dBi, the difference value of E, H half-power lobe width in the frequency band is stable within 7.5 degrees, and the wide function can be played in the compact field test.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the outer wall of the structure of the present invention in longitudinal section and a rectangular supporting block in structure, wherein (a) is a sectional view and (b) is a perspective view.
FIG. 3 is a schematic view showing a longitudinal cross section of a rectangular hole with a thin ridge bottom and a reverse four ridges with a widened ridge thickness according to the present invention, wherein (a) is a front view and (b) is a top view.
Fig. 4 is a schematic view showing the structure of the axial corrugated groove and the longitudinal section of the high-frequency choke groove of the present invention.
FIG. 5 is a schematic diagram of the simulation result of the voltage standing wave ratio parameter curve of the present invention.
FIG. 6 is a graph showing the results of a simulation of the gain versus frequency for the present invention.
Fig. 7 is a graphical representation of half power lobe widths of the E-plane and H-plane as a function of frequency for the wideband dual polarized corrugated horn antenna of fig. 1 when excited with x-polarization.
Fig. 8 is a main polarization and cross polarization pattern of the E-plane of the wideband dual-polarized corrugated horn antenna of fig. 1 at different frequencies upon x-polarization excitation.
Fig. 9 is a main polarization and cross polarization pattern of the H-plane of the wideband dual-polarized corrugated horn antenna of fig. 1 at different frequencies upon x-polarization excitation.
FIG. 10 is a schematic diagram of simulation results of the frequency dependence of the isolation of the input port according to the present invention.
FIG. 11 is a polar plot of the E-plane and H-plane of the present invention at 8GHz,13GHz,18 GHz.
Detailed Description
The invention will be further described in detail with reference to the drawings and examples, without any limitation thereof, in order to make the objects, features and advantages of the invention more comprehensible.
The broadband dual-polarized corrugated horn antenna based on the high-frequency choke groove works in the X frequency band and the K frequency band. Specifically, referring to fig. 1, a compound curve arm horn antenna 1, an open-pore reverse four ridge 2, and a high-frequency choke groove 4 are mainly included. To better illustrate the internal structure of the feedhorns of the present application, fig. 1 uses perspective.
Referring to fig. 2, the compound curved arm horn antenna 1 is formed by connecting a bottom circular waveguide section 11, a curved section 12 and an opening surface circular waveguide section 13. Wherein the inner and outer radii of the curved section 12 are gradually increased along the direction from the bottom to the mouth surface. The voltage standing wave ratio of the horn antenna 1 with the composite curve arm can be greatly reduced by the structural connection mode of the two sections of circular waveguide sections (namely the bottom circular waveguide section 11 and the mouth-face circular waveguide section 13) and the one section of curve section (namely the curve section 12).
Referring to fig. 3, the perforated reverse four ridges 2 are coaxially disposed in the compound curve arm horn antenna 1, and are a cross-shaped structure formed by splicing four ridge plates 22; the outer ridge line of each ridge plate 22 changes along with a modified exponential function, and the modified exponential function ensures that the ridge top surface of the open-pore reverse four ridges 2 is square; the thickness of each ridge plate 22 gradually widens from inside to outside, i.e., along the direction from the bottom to the mouth surface, and each ridge plate 22 is provided with a thin rectangular hole 21. Through the increase of the thickness of the orifice surface ridge and the opening of the bottom ridge, the high-frequency gain can be effectively improved and the isolation of the port can be improved.
The high-frequency choke groove 4 is an axial circular groove carved on the wall thickness of the mouth surface of the horn antenna 1 with the compound curve arm, namely, a circular ring is dug at the position opposite to the wall thickness of the mouth surface, and the high-frequency choke groove 4 is preferably positioned in the middle of the wall thickness of the mouth surface. The high-frequency choke groove 4 formed by grooving can throttle the current at high frequency and improve the current distribution at the high-frequency port. The high-frequency current containment structure is added, so that the current intensity of the mouth surface is relatively uniform around at high frequency, and the coincidence degree of the E surface and the H surface of the high-frequency radiation pattern is good, namely the high-frequency radiation pattern is improved. .
The side wall of the bottom circular waveguide section 11 is provided with a circular hole 110, and the inner core of the feed coaxial line 6 passes through the circular hole 110 to enter the inside of the compound curve arm horn antenna 1, and is structurally connected with the open-pore reverse four ridges 2.
Referring again to fig. 2, in some embodiments of the present invention, the bottom circular waveguide section 11 is cylindrical, has one end open and one end closed, and the mouth-side circular waveguide section 13 is also cylindrical, but has two ends open. The curved section 12 is formed by a gradually increasing radius similar to a circular waveguide, open at both ends. The bottom circular waveguide section 11 is connected with an opening port with small opening surface radius of the curve section 12 through the opening port, and the opening port with large opening surface radius of the curve section 12 is connected with one opening port of the circular waveguide section 13. Illustratively, the present embodiment also provides a preferred dimensional parameter, as indicated in FIG. 2, with the length of the bottom circular waveguide segment 11 being h 5 Diameter r of bottom circular waveguide segment 11 =6.2 mm 1 =8.8mm, curve segment 12 has a length h 4 Length h of the circular waveguide segment 13 3 =7.8mm, diameter of the orofacial circular waveguide segment 13 r 2 ＝11.6mm。
In some embodiments of the present invention, the curve segment 12 is an exponential function type curve wall, the inner wall and the outer wall are all exponentially varying, and if the axial direction of the antenna is z-direction, the function expression of the yoz surface of the curve segment 12 is:
wherein g 1 And k 1 Are all constant term parameters, in particular, parameter g 1 The value is between 0.02 and 0.03, and the parameter k is 1 The value is between 0.09 and 0.11.
Referring again to fig. 2 and 3, in some embodiments of the present invention, the four ridge plates forming the perforated inverted four ridges 2 are similar to a triangle in shape, the perforated inverted four ridges 2 are fixed at the center of the bottom circular waveguide section 11 by the rectangular support blocks 5, and the thickness of each ridge plate 22 is widest at the flare opening face for adjusting the high frequency radiation opening face, and narrowest near the bottom support block. The top surface of the open-pore reverse tetraridge 2 is provided with a tetrapyramid 23, and the center of the tetrapyramid 23 coincides with the center of the open-pore reverse tetraridge 2. The square surface at the bottom of the quadricorn 23 is tightly fitted with the square surface at the top of the outwardly widening open-pore inverted quadricorn 2. In the invention, the ratio of the axial length of the reverse four ridges 2 of the open hole to the axial length of the compound curve arm horn antenna 1 is between 0.86 and 0.95, and the distance between the outer ridge line of the reverse four ridges and the inner wall of the compound curve arm horn antenna 1 is gradually increased from 0.82mm to 9.85mm. Illustratively, the present embodiment also provides a preferred dimensional parameter, the minimum width w of the ridge plate, as indicated in FIG. 3 6 Ridge maximum width w=2.4mm 5 =3.5 mm, the length of the entire open reverse four ridges 2 is h 1 54.5mm, width w of bottommost longitudinal section of reverse four ridges 2 of the opening 8 ＝16mm。
In the embodiment of the present invention, the thickness of the ridge plate 22 is the widest at the radiation port of the circular waveguide section 13 with the mouth surface, the narrowest at the bottom, and the functional expression of the outer ridge line of each ridge plate 22 is:
wherein g 2 And k 2 Are constants, K is a correction factor, specifically, a parameter g 2 The value is between 0.01 and 0.015, and the parameter k 2 The value is between 0.01 and 0.015.
The invention is based on the round opening waveguide antenna to carry on the functionalization to the round waveguide wall, use the exponential function wall to replace the round waveguide wall, and use the exponential curve with correction factor as the spine curve of the reverse four ridges, let the width of the spine located on the oral surface increase, can change the size of the radiation oral surface effectively, have improving effects to the high-frequency gain in the frequency band, and because of the gradual increase of the spine thickness and the function of the exponential function wall, can make the impedance of the feeding coaxial line transition to the free space impedance smoothly, promote the bandwidth of the antenna greatly, has reduced the voltage standing wave ratio.
Referring to fig. 3, in one embodiment of the present invention, eight rectangular holes 21 are formed at the bottom ends of the ridge plates 22 with four opposite ridges 2, that is, two rectangular holes 21 are formed on each ridge plate 22, and the rectangular holes 21 are located generally below the ridge plates 22 and are rotationally symmetrical with respect to each ridge plate 22. The two thin rectangular holes 21 are positioned at different heights, namely different axial positions, on one ridge plate 22, gaps between the thin rectangular holes 21 and the ridge plate 22 form a cavity, electromagnetic waves are reflected on the inner surface of the cavity for multiple times, and the return loss and isolation of the antenna can be improved through reasonable optimization. In the present embodiment, the long side of the thin rectangular hole 21 is the height h 2 The value should be 0.23 lambda min ～0.25λ min Between, short sides, i.e. width w 7 The value should be 0.025 lambda min ～0.04λ min Wherein lambda is min Is the smallest wavelength within the operating band. In this embodiment, h is preferably selected 2 ＝3.9mm，w 7 ＝0.5mm。
Referring to fig. 4, in one embodiment of the present invention, the axial corrugation 3 surrounds the edge of the opening surface of the compound curve arm horn antenna 1, and is formed by a plurality of annular rings with gradually increasing radius from inside to outside. The innermost groove 33 is formed by the outer wall of the compound curved arm horn antenna 1 and the innermost ring being spaced apart. In fig. 4, 3 axial grooves are shown, namely an innermost groove 33, an intermediate groove 32 and an outermost groove 31. The intermediate groove 32 is formed by the innermost annular ring and the intermediate annular ring in spaced relation. The outermost groove 31 is formed by spacing the outermost ring and the intermediate ring. Illustratively, the present embodiment also provides a preferred dimensional parameter, as indicated in FIG. 4, the height d of the outermost groove 31 1 Width w of outermost groove 31 =9.6mm 4 Height d of intermediate groove 32 =2.4 mm 2 Width w of intermediate groove 32 =9.4mm 3 Height d of innermost groove 33 =2.3 mm 3 ＝9.7mm, width w of innermost groove 33 2 ＝3.4mm。
In this embodiment, the axial corrugated groove 3 can effectively change the radiation port surface of the antenna, improve the cross polarization discrimination and stabilize the gain in the frequency band. Differential feeding is applied at the feeding position, so that the radiation influence between coaxial line ports is minimized, the generation of a higher order mode can be restrained, and the port isolation is improved.
Referring to fig. 4, in one embodiment of the present invention, a preferred dimension parameter is also provided, and the height of the high frequency choke groove 4 is d 4 =3.4 mm, width w 1 ＝0.5mm。
Simulation experiments are carried out on the broadband dual-polarized corrugated horn antenna based on the high-frequency choke groove through simulation software, and the obtained simulation results are shown in fig. 5 to 11.
Referring to fig. 5, a plot of dual polarized voltage standing wave ratio (VSWR, voltage Standing Wave Ration) as a function of frequency is shown. The working frequency band of the broadband dual-polarized corrugated horn antenna is 8GHz to 18GHz, and the in-band voltage standing wave ratio is smaller than 1.5. By curving the horn wall, the voltage standing wave ratio is reduced.
Referring to fig. 6, a plot of gain versus frequency for both x-and y-polarization is shown. The minimum value of the gain in the frequency band from 8GHz to 18GHz is 9.7dBi, and the maximum value of the gain is 11.6dBi. The gain in the frequency band can be more smooth along with the change of the frequency by increasing the axial ripple groove and the high-frequency choke groove, and the gain has good stability.
Referring to fig. 7, a graph of the frequency variation of the half power lobe widths of the E-plane and the H-plane in the x-polarization excitation of the wideband dual-polarized corrugated horn antenna based on the high-frequency choke groove according to the present embodiment is shown, in which the half power lobe width of the E-plane is 52.64 ° to 60.11 ° and the half power lobe width of the H-plane is 57.19 ° to 61.78 ° in the range of 8GHz to 18GHz, and the half power lobe widths are very stable in both the E-plane and the H-plane.
Referring to fig. 8 and 9, in this embodiment, main polarization and cross polarization patterns of E-plane and H-plane at different frequencies are good in uniformity in main polarization patterns of E-plane and H-plane at different frequencies in the range of 8 GHz-18 GHz, and cross polarization discrimination of E-plane and H-plane is higher than 40dB.
Referring to fig. 10, a plot of input port isolation as a function of frequency is shown. The isolation of the input port in the frequency range from 8GHz to 18GHz is more than 48dB, and is superior to the minimum port isolation index of 20dB of the existing four-ridge horn antenna.
Referring to fig. 11, in this embodiment, a polar coordinate pattern of a broadband dual-polarized corrugated horn antenna based on a high-frequency choke groove is shown in x-polarization excitation, and when the frequency is 8ghz,13ghz, and 18ghz, the radiation patterns of the E-plane and the H-plane of the antenna have good coincidence.
In summary, the broadband dual-polarized corrugated horn antenna of the invention uses the exponential function wall to replace the circular waveguide wall by performing functionalization on the circular waveguide wall on the basis of the circular opening waveguide antenna, and uses the exponential curve with the correction factor as the ridge curve of the reverse four ridges, so that the width of the ridge positioned on the mouth surface is increased, the size of the radiation mouth surface can be effectively changed, the high-frequency gain in the frequency band is improved, and the impedance at the feeding coaxial line can be smoothly transited to free space impedance due to the gradual widening of the ridge thickness and the action of the exponential function wall, the bandwidth of the antenna is greatly improved, and the voltage standing wave ratio is reduced. Eight thin rectangular holes are formed in the bottommost end of the reverse four ridges, two thin rectangular holes are formed in each ridge plate, a cavity is formed by gaps between the thin rectangular holes and the ridge plates, electromagnetic waves are reflected on the inner surface of the cavity for multiple times, and the voltage standing wave ratio and isolation of the antenna can be improved through reasonable optimization. The high-frequency choke groove formed by grooving on the wall thickness of the mouth surface of the horn antenna with the compound curve arm can choke the current at a high frequency, and a high-frequency current choke structure is added, so that the current intensity of the mouth surface is relatively uniform around the mouth surface at high frequency, and the coincidence degree of the E surface and the H surface of the high-frequency radiation pattern is good.
In conclusion, the invention improves the high-frequency radiation pattern of the reverse four-ridge horn antenna while improving the bandwidth of the horn antenna, and simultaneously has the characteristics of high port isolation, high cross polarization discrimination, stable half-power lobe width in a frequency band and the like.
The wideband dual-polarized corrugated horn antenna based on the high-frequency choke groove provided by the invention is described in detail, and the principle and the implementation mode of the invention are illustrated and realized by applying the detailed structural design. The above description of the embodiments is only for aiding in the understanding of the method of the present invention and its core ideas. It should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (10)
1. The broadband dual-polarized corrugated horn antenna based on the high-frequency choke groove is characterized by comprising a compound curve arm horn antenna (1), an open-pore reverse four-ridge (2) and the high-frequency choke groove (4);
the compound curve arm horn antenna (1) is formed by connecting a bottom circular waveguide section (11), a curve section (12) and an opening surface circular waveguide section (13); the inner radius and the outer radius of the curve section (12) are gradually increased along the direction from the bottom to the mouth surface;
the perforated reverse four ridges (2) are coaxially arranged in the compound curve arm horn antenna (1) and are of a structure formed by splicing four ridge plates (22) and having a cross section; the outer ridge line of each ridge plate (22) changes along with a correction index function, and the correction index function ensures that the ridge top surface of the open-pore reverse four ridges (2) is square; the thickness of each ridge plate (22) is gradually widened from inside to outside, namely along the direction from the bottom to the mouth surface, and each ridge plate (22) is provided with a thin rectangular hole (21);
the high-frequency choke groove (4) is an axial circular groove carved on the wall thickness of the mouth surface of the compound curve arm horn antenna (1).
2. Broadband dual polarized corrugated horn antenna based on high frequency choke tank according to claim 1, characterized in that the bottom circular waveguide section (11) is cylindrical with one end open and one end closed; the circular waveguide section (13) with the opening surface is cylindrical, and two ends of the circular waveguide section are open; the two ends of the curve section (12) are both open, and the open port of the bottom circular waveguide section (11) is connected with the open port with small radius of the open port surface of the curve section (12), and the open port with large radius of the open port surface of the curve section (12) is connected with one open port of the circular waveguide section (13).
3. The broadband dual-polarized corrugated horn antenna based on high-frequency choke groove according to claim 1, wherein the curve section (12) is an exponential function type curve wall, the inner wall and the outer wall are all changed in an exponential function, and if the axial direction of the antenna is z-direction, the function expression of yoz surface of the curve section (12) is:
wherein the parameter g 1 The value is between 0.02 and 0.03, and the parameter k is 1 The value is between 0.09 and 0.11.
4. Broadband dual-polarized corrugated horn antenna based on high-frequency choke groove according to claim 1, characterized in that the bottom of the perforated inverted four-ridge (2) is fixed at the center of the bottom circular waveguide section (11) by a rectangular supporting block (5), the ridge top surface of the perforated inverted four-ridge (2) is provided with a four-pyramid (23), and the center of the four-pyramid (23) coincides with the center of the perforated inverted four-ridge (2).
5. The broadband dual-polarized corrugated horn antenna based on the high-frequency choke groove according to claim 1, wherein the ratio of the axial length of the open-pore reverse four ridges (2) to the axial length of the compound curve arm horn antenna (1) is between 0.86 and 0.95, and the distance between the outer ridge line and the inner wall of the compound curve arm horn antenna (1) is gradually increased from 0.82mm to 9.85mm.
6. Broadband dual polarized corrugated horn antenna based on high frequency choke groove according to claim 1, characterized in that the thickness of the ridge plate (22) is widest at the radiation port of the circular waveguide section (13) with the port face and the bottom is narrowest, and the functional expression of the outer ridge line of each ridge plate (22) is:
wherein the parameter g 2 The value is between 0.01 and 0.015, and the parameter k 2 The value is between 0.01 and 0.015, and K is a correction factor.
7. Broadband dual polarized corrugated horn antenna based on high frequency choke tank according to claim 1, characterized in that each of said ridge plates (22) is provided with two thin rectangular holes (21) at different axial positions, long sides h of thin rectangular holes 2 Take the value of 0.23 lambda min ～0.25λ min Between short sides w 7 Take the value of 0.025 lambda min ～0.04λ min Wherein lambda is min Is the smallest wavelength within the operating band.
8. Broadband dual-polarized corrugated horn antenna based on high-frequency choke groove according to claim 1, characterized in that several axial corrugated grooves (3) are arranged on the opening surface edge of the compound curve arm horn antenna (1), and the axial corrugated grooves (3) are formed by several annular spaces with gradually increasing radius from inside to outside.
9. Broadband dual-polarized corrugated horn antenna based on high-frequency choke tank according to claim 8, characterized in that the depth and height of each axial corrugated tank (3) are different.
10. The broadband dual-polarized corrugated horn antenna based on the high-frequency choke groove according to claim 1, wherein a circular hole (110) is formed in the side wall of the bottom circular waveguide section (11), and an inner core of the feeding coaxial line (6) penetrates through the circular hole (110) to enter the interior of the composite curve arm horn antenna (1) and is structurally connected with the perforated reverse four ridges (2).
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| CN202310367335.6A CN116315614A (en) | 2023-04-07 | 2023-04-07 | Broadband dual-polarized corrugated horn antenna based on high-frequency choke groove |
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| CN202310367335.6A CN116315614A (en) | 2023-04-07 | 2023-04-07 | Broadband dual-polarized corrugated horn antenna based on high-frequency choke groove |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117855812A (en) * | 2024-01-29 | 2024-04-09 | 中国科学院上海微系统与信息技术研究所 | Waveguide antenna array and communication module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117855812A (en) * | 2024-01-29 | 2024-04-09 | 中国科学院上海微系统与信息技术研究所 | Waveguide antenna array and communication module |
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