CN110867644B - Dual-band multi-polarization common-caliber coaxial waveguide slot antenna - Google Patents
Dual-band multi-polarization common-caliber coaxial waveguide slot antenna Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01Q1/364—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith using a particular conducting material, e.g. superconductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
Abstract
The application discloses coaxial waveguide slot antenna of dual band multipolar common caliber, this slot antenna includes: the waveguide cavity, the feed strip line and the feed coaxial line; the waveguide cavity comprises a plurality of rectangular antenna cavities, wherein a first antenna cavity and a second antenna cavity are distributed on two sides of the plane of the waveguide cavity at intervals in a sawtooth shape, the first antenna cavity is positioned above the plane, the second antenna cavity is positioned below the plane, a third antenna cavity is coated on the outer side of the second antenna cavity, and the outer walls of two sides of the third antenna cavity are positioned below the two first antenna cavities at equal intervals; the feed strip line is arranged at the bottom of the antenna cavity, and a feed coaxial line is welded on the feed strip line and used for feeding to the feed strip line. Through the technical scheme in this application, provide a dual-band multipolarization bore coaxial waveguide slot antenna altogether, have the integrated level height, the isolation is high, light in weight' S characteristics realize the transmission and the receipt of S wave band and C wave band dual-band, multipolarization electromagnetic wave signal.
Description
Technical Field
The application relates to the technical field of microwave antennas, in particular to a dual-band multi-polarization common-caliber coaxial waveguide slot antenna.
Background
The development trend of the common-aperture antenna is multiband, multi-polarization and broadband, the antenna combination of high and low frequency bands has obvious advantages in the synthetic aperture radar, and when antennas of different frequency bands are nested on the same radar antenna aperture surface, richer imaging area information can be provided. For signals of low frequency bands, the attenuation and the stereo scattering caused by the groves are small, the false alarm rate is low, and the method is particularly suitable for change detection; and the high-frequency band signal has better resolution, target identification and tracking functions. The radar system adopting the low-frequency and high-frequency multi-frequency-band common-caliber antenna can be widely applied to ground imaging, resource exploration, disaster assessment and the like.
Because a plurality of antennas are nested in the same narrow space, stronger electromagnetic coupling can be generated between the antennas generally, normal work among the antennas is influenced, and the performance of the antennas can be reduced, so that the problem of isolation among the antennas is the difficult point and the key of the design of the common-caliber antenna, otherwise, the advantage of the common-caliber antenna is lost, and the common-caliber antenna with excellent performance and high isolation degree needs to be designed by reasonably utilizing the limited space.
Disclosure of Invention
The purpose of this application lies in: the dual-band multi-polarization co-aperture coaxial waveguide slot antenna has the characteristics of high integration level, high isolation and light weight, and adopts the coaxial lines for feeding so as to realize the transmission and reception of electromagnetic wave signals with S-band vertical polarization, C-band horizontal polarization and vertical polarization.
The technical scheme of the application is as follows: there is provided a dual-band multi-polarization common-aperture coaxial waveguide slot antenna, including: the waveguide cavity, the feed strip line and the feed coaxial line; the waveguide cavity comprises a plurality of rectangular antenna cavities, wherein a first antenna cavity and a second antenna cavity are distributed on two sides of the plane of the waveguide cavity at intervals in a sawtooth shape, the first antenna cavity is positioned above the plane, the second antenna cavity is positioned below the plane, a third antenna cavity is coated on the outer side of the second antenna cavity, and the outer walls of two sides of the third antenna cavity are positioned below the two first antenna cavities at equal intervals; the feed strip line is arranged at the bottom of the antenna cavity, and a feed coaxial line is welded on the feed strip line and used for feeding to the feed strip line.
In any one of the above technical solutions, further, the slot antenna further includes: supporting the foam; the supporting foam is positioned between the bottom of the antenna cavity and the feed strip line; the feed coaxial line passes through the support foam and the bottom of the antenna cavity and is positioned outside the antenna cavity.
In any of the above technical solutions, further, two ends of the antenna cavity are closed cavity bodies, a cross section of the first antenna cavity is W2 × H2, first waveguide slots are arranged on an upper surface of the first antenna cavity at equal intervals, a length direction of each first waveguide slot is perpendicular to a length direction of the first antenna cavity, and a length of each first waveguide slot is Ls2 ═ 0.5 λcWherein W2 is 0.125 lambdac，H3＝0.1λc，λcThe free space wavelength corresponding to the working frequency of the C-band antenna.
In any of the above technical solutions, further, the size of the cross section of the second antenna cavity is W3 × H3, second waveguide slots are provided at the center of the upper surface of the second antenna cavity at equal intervals, the length direction of the second waveguide slot is parallel to the length direction of the second antenna cavity, and the length of the second waveguide slot is Ls3 ═ 0.5 λcWherein W3 is 0.125 lambdac，H3＝0.1λc。
In any of the above technical solutions, a cross-sectional dimension of the third antenna cavity is W1 × H1, third waveguide slots are disposed on an upper surface of the third antenna cavity at equal intervals, the third waveguide slots are symmetrically disposed on two sides of the second antenna cavity, and a length of the third waveguide slot is Ls1 ═ 0.5 λsWherein W1 is 0.125 lambdas，H1＝0.1λs，λsThe wavelength is the free space wavelength corresponding to the working frequency of the S-band vertical polarization antenna.
In any of the above technical solutions, further, the first power feeding line in the first antenna cavity is a bent metal sheet with a width Wf2, a central line of the first power feeding line is located at a central position in a length direction of the first antenna cavity and perpendicular to the first waveguide slot, and bent line sections of the first power feeding line are symmetricalThe first feed lines are arranged on two sides of the central line, and the length of the first feed line between two adjacent first waveguide gaps is Lf2 ═ lambdacWherein Wf2 is 0.04 lambdacThe first feeding coaxial line is located at the center of the first antenna cavity and is connected to a bent line section below the center line of the first feeding line through a feeding metal sheet, and the difference between the distance Lf21 from the left side of the welding position to the first waveguide gap along the first feeding line and the distance Lf22 from the right side of the welding position to the first waveguide gap along the first feeding line is 0.5 lambdac。
In any of the above technical solutions, further, the second feeding line in the second antenna cavity is a bent metal sheet with a width Wf3, the second feeding coaxial line is located at a center of the second antenna cavity and connected to the second feeding line through the feeding metal sheet, the second feeding line is square-wave shaped and symmetrically distributed on two sides of the second feeding coaxial line, and a length of the second feeding line between two adjacent second waveguide slots is Lf3 ═ λcWherein Wf3 is 0.04 lambdac。
In any of the above technical solutions, further, the third feeding line in the third antenna cavity is a bent metal sheet with a width Wf1, the third feeding coaxial line is located at the center of the third antenna cavity and near the first antenna cavity, the third feeding coaxial line is connected to the third feeding line, the third feeding line is square-wave shaped and symmetrically distributed on two sides of the third feeding coaxial line, and the length of the third feeding line is Lf1 ═ λ in one square wave periodSWherein Wf1 is 0.04 lambdaS。
The beneficial effect of this application is:
1. small size and light weight: the slot antenna in the application is a coaxial waveguide slot antenna, and through the structural design in the application, a third antenna cavity is coated on the outer side of a second antenna cavity, the third antenna cavity and the third antenna cavity share a waveguide wall, the slot antenna between different frequency bands is integrally processed, nesting of two frequency bands and a plurality of polarized waveguide antennas is achieved on a limited physical aperture area, the structure is compact, the cross-sectional area of a waveguide is half of that of a standard rectangular waveguide, and the weight of the slot antenna is further reduced.
2. The structure is simple and easy to process: coaxial waveguide slot antenna adopts the waveguide cavity of rectangle in this application, and every waveguide cavity is inside to have independent feed strip line, and every frequency channel and every waveguide cavity that polarizes and correspond are kept apart each other, compares with common miniaturized ridge waveguide, does not have complicated structure of buckling in the coaxial waveguide cavity, and the processing welding degree of difficulty greatly reduced has greatly reduced the processing cost of waveguide cavity.
3. High radiation efficiency and good isolation: the common-caliber microstrip antenna has the radiation efficiency of only about 70%, and the actual measurement result of the coaxial waveguide slot antenna shows that the radiation efficiency is more than 80%. In addition, the polarization isolation degree of a common microstrip antenna is about-20 dB, the isolation degree between two polarization waveguides of a C wave band in the application is better than-40 dB, and the isolation degree between two S/C frequency bands in the application is better than-30 dB, so that the microstrip antenna has better anti-interference capability.
4. The interface is flexible and easy to integrate: this application adopts coaxial feed structure, and through the radio frequency link interconnection of feed coaxial line and rear end, whole waveguide slot antenna adopts the aluminum alloy material, and the bottom is planar structure, and is compact with radar antenna system's mounting panel interconnection, and the installation is dismantled conveniently.
Drawings
The advantages of the above and/or additional aspects of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of a dual-band multi-polarization common aperture coaxial waveguide slot antenna according to one embodiment of the present application;
fig. 2 is a cross-sectional view of a dual-band multi-polarization co-aperture coaxial waveguide slot antenna according to an embodiment of the present application;
FIG. 3 is a top view of a C-band horizontally polarized waveguide antenna according to one embodiment of the present application;
FIG. 4 is a top view of a C-band vertically polarized waveguide antenna according to one embodiment of the present application;
FIG. 5 is a top view of an S-band waveguide antenna according to one embodiment of the present application;
FIG. 6 is a plot of standing wave ratio for an S-band antenna input port according to one embodiment of the present application;
FIG. 7 is a standing wave ratio plot for vertically polarized and horizontally polarized input ports of a C-band antenna according to one embodiment of the present application;
FIG. 8 is a graph of isolation curves for vertically polarized and horizontally polarized input ports of a C-band antenna according to one embodiment of the present application;
FIG. 9 is a pattern of horizontal and vertical planes of an S-band antenna according to one embodiment of the present application;
fig. 10 is a C-band horizontal, vertical polarized antenna horizontal and vertical plane pattern according to one embodiment of the present application.
Detailed Description
In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.
As shown in fig. 1 and fig. 2, the present embodiment provides a dual-band multi-polarization co-aperture coaxial waveguide slot antenna, a waveguide cavity, a feeding strip line and a feeding coaxial line; the waveguide cavity comprises a plurality of rectangular antenna cavities, wherein a first antenna cavity 2 and a second antenna cavity 3 are distributed on two sides of the plane of the waveguide cavity at intervals in a sawtooth shape, the first antenna cavity 2 is positioned above the plane, the second antenna cavity 3 is positioned below the plane, a third antenna cavity 1 is coated on the outer side of one second antenna cavity 3, and the outer walls of two sides of the third antenna cavity 1 are positioned below the two first antenna cavities 2 at equal intervals; the feed strip line is arranged at the bottom of the antenna cavity, and a feed coaxial line is welded on the feed strip line and used for feeding to the feed strip line.
In this embodiment, totally, five antenna cavities are provided, including two first antenna cavities 2, two second antenna cavities 3 and a third antenna cavity 1, the five antenna cavities are integrally formed by welding, wherein a C-band horizontally-polarized coaxial waveguide slot antenna is placed in the first antenna cavity 2, a C-band vertically-polarized coaxial waveguide slot antenna is placed in the second antenna cavity 3, an S-band vertically-polarized coaxial slot antenna is placed in the third antenna cavity 1, the working modes of the three slot antennas are the same, the external waveguide cavity and the internal metal strip line form a coaxial waveguide structure, and the coaxial waveguide structure is different from the electromagnetic wave in the conventional waveguide transmission TE mode and transmits the electromagnetic wave in the TEM mode. The size of the coaxial waveguide slot antenna is smaller than that of the conventional waveguide slot antenna, and the cross-sectional size of the coaxial waveguide slot antenna is about 1/2 of the conventional waveguide slot antenna.
The lower bottom surface of the first antenna cavity 2 and the upper bottom surface of the second antenna cavity 3 are positioned on the same horizontal plane, the cross section of the third antenna cavity 1 is concave, the second antenna cavity 3 on the left side is coated and arranged, and the waveguide cavity wall is shared.
Further, the slot antenna further includes: supporting the foam; the supporting foam is positioned between the bottom of the antenna cavity and the feed strip line; the feed coaxial line passes through the support foam and the bottom of the antenna cavity and is positioned outside the antenna cavity.
Specifically, the bottom of each antenna cavity is provided with supporting foam made of Polymethacrylimide (PMI) rigid foam, a feeding strip line is pasted on the supporting foam through an adhesive, and a feeding antenna is connected with a feeding coaxial line, wherein the feeding coaxial line in the second antenna cavity 3 coated by the third antenna cavity 1 needs to penetrate through the supporting foam in the third antenna cavity 1 and is led out from the lower surface of the supporting foam.
In this embodiment, the height H1 of the third antenna cavity 1 is set to 0.1 λ S, the width W1 is set to 0.125 λ S, and the width Wf1 of the third feeding strip line 11 is set to 0.04 λ S, where λ S is a free space wavelength corresponding to the operating frequency of the S-band vertically polarized antenna. The height H2 of the first antenna cavity 2 is 0.1 λ c, the width W2 is 0.125 λ c, and the width Wf2 of the first feed strip line 21 is 0.04 λ c. The height H3 of the second antenna cavity 3 is 0.1 λ C, the width W3 is 0.125 λ C, the width Wf3 of the third feeding strip line 31 is 0.04 λ C, and λ C is a free space wavelength corresponding to the operating frequency of the C-band antenna.
Furthermore, two ends of the antenna cavity are closed cavity bodies, the cross section of the first antenna cavity 2 is W2 multiplied by H2, first waveguide slots 5 are arranged on the upper surface of the first antenna cavity 2 at equal intervals, the length direction of each first waveguide slot 5 is perpendicular to the length direction of the first antenna cavity 2, and the length of each first waveguide slot 5 is Ls 2-0.5 lambdacThe width of the first waveguide slot 2 is Ws2 ═ 0.025 λcWherein W2 is 0.125 lambdac，H3＝0.1λc，λcThe free space wavelength corresponding to the working frequency of the C-band antenna.
Preferably, the first power feeding line 21 in the first antenna cavity 2 is a bent metal sheet with a width Wf2, a central line of the first power feeding line 21 is located at a central position in a length direction of the first antenna cavity 2 and perpendicular to the first waveguide slot 5, bent line sections of the first power feeding line 21 are symmetrically arranged at two sides of the central line, and a length Lf2 ═ λ of the first power feeding line 21 between two adjacent first waveguide slots 5 is equal tocWherein Wf2 is 0.04 lambdacThe first feeding coaxial line 23 is located at the center of the first antenna cavity 2 and is connected to the bent line section below the center line of the first feeding line 21 through a feeding metal piece, and the difference between the distance Lf21 from the left side of the bonding position to the first waveguide slit 5 along the first feeding line 21 and the distance Lf22 from the right side of the bonding position to the first waveguide slit 5 along the first feeding line 21 is 0.5 λc。
Specifically, as shown in fig. 3, the C-band horizontally polarized coaxial waveguide slot antenna is composed of a rectangular waveguide cavity (first antenna cavity 2), a first power feed line 21, a first support foam 22, and a first power feed coaxial line 23. The first feed line 21 constitutes a coaxial waveguide structure together with the first antenna cavity 2. The first support foam 22 and the first feeding line 21 are sequentially fixed to the lower surface of the first antenna cavity 2 by an adhesive. A total of 8 first waveguide slots 5 in the vertical direction are formed in the upper surface of the first antenna cavity 2, and the total length Ls2 of the first waveguide slots 5 in the transverse direction and the longitudinal direction is 0.5 λ C (λ C is the wavelength corresponding to the C-band operating frequency). The first power feeding line 21 is a bent metal piece having a width Wf2, and a horizontal portion of the first power feeding line 21 located directly below the first waveguide slot 5 excites the first waveguide slot 5, thereby achieving an effect of radiating electromagnetic waves. The total length Lf2 of the first feed line 21 bent from 1 first waveguide slot 5 to another adjacent waveguide slot 1 is λ c to ensure that the first waveguide slot 5 can be excited in equal phase. The first feed line 21 is open at both ends and the strip line continues for the length of Le2, acting as an impedance match. The first feeding coaxial line 23 is an input/output interface of a C-band horizontally polarized electromagnetic wave signal in the embodiment, the first feeding coaxial line 23 is a coaxial line with a characteristic impedance of 50 ohms, an inner conductor of the first feeding coaxial line 23 passes through the first supporting foam 22 to be welded with the first feeding line 21, a welding point is deviated from the center of the first feeding line 21 and is connected through a feeding metal sheet, and the difference Lf21-Lf22 between the distance from the welding point to the first gap on the left side and the distance from the welding point to the first gap on the right side is 0.5 λ C. The outer conductor of the first feeding coaxial line 23 is soldered to the first antenna cavity 2.
Further, the cross-sectional dimension of the second antenna cavity 3 is W3 × H3, the second waveguide slot 6 is disposed at the center of the upper surface of the second antenna cavity 3 at equal intervals, the longitudinal direction of the second waveguide slot 6 is parallel to the longitudinal direction of the second antenna cavity 3, and the length of the second waveguide slot 6 is Ls3 ═ 0.5 λcThe width of the second waveguide slot 3 is Ws3 ═ 0.025 λcThe same width as the first waveguide slot 2, W3 ═ 0.125 λc，H3＝0.1λc。
Preferably, the second feeding line 31 in the second antenna cavity 3 is a bent metal sheet with a width Wf3, the second feeding coaxial line 33 is located at the center of the second antenna cavity 3 and connected to the second feeding line 31 through the feeding metal sheet, the second feeding line 31 is square-wave shaped and symmetrically distributed on two sides of the second feeding coaxial line 33, and the length of the second feeding line 31 between two adjacent second waveguide slots 6 is Lf3 ═ λcWherein Wf3 is 0.04 lambdac。
Specifically, as shown in fig. 4, the C-band vertically polarized coaxial waveguide slot antenna is composed of a rectangular waveguide cavity (second antenna cavity 3), a second power feed line 31, a second support foam 32, and a second power feed coaxial line 33. The second feed line 31 constitutes a coaxial waveguide structure together with the second antenna cavity 3. The second support foam 32 and the second feeding line 31 are sequentially fixed to the lower surface of the second antenna cavity 3 by an adhesive. A total of 8 second waveguide slots 6 in the horizontal direction are opened in the upper surface of the second antenna cavity 3, and the length Ls2 of the second waveguide slot 6 is 0.5 λ c. The second power feeding line 31 is a bent metal piece having a width Wf3, and a vertical portion of the second power feeding line 31 located directly below the second waveguide slot 6 excites the second waveguide slot 6, thereby achieving an effect of radiating electromagnetic waves. The total length Lf3 of the bent second feed line 31 from 1 second waveguide slot 6 to the adjacent other 1 waveguide slot is λ c, so as to ensure that the second waveguide slot 6 can be excited in equal phase. The second feed line 31 is open at both ends and the strip line continues for the length of Le3, acting as an impedance match. The second feeding coaxial line 33 is an input/output interface of the C-band vertically polarized electromagnetic wave signal in the present invention, the second feeding coaxial line 33 is a coaxial line having a characteristic impedance of 50 ohms, an inner conductor of the second feeding coaxial line 33 passes through the second supporting foam 32 to be welded to the second feeding line 31, and a welding point is located at the center of the second feeding line 31. The outer conductor of the second feed coaxial line 33 is soldered to the second antenna cavity 3.
Further, the cross-sectional dimension of the third antenna cavity 1 is W1 × H1, the third waveguide slots 4 are equally spaced on the upper surface of the third antenna cavity 1, the third waveguide slots 4 are symmetrically arranged on two sides of the second antenna cavity 3, and the length of the third waveguide slot 4 is Ls1 ═ 0.5 λsThe width of the third waveguide slit 4 is Ws1 ═ 0.025 λsWherein W1 is 0.125 lambdas，H1＝0.1λs，λsThe wavelength is the free space wavelength corresponding to the working frequency of the S-band vertical polarization antenna.
Preferably, the third feeding line 11 in the third antenna cavity 1 is a bent metal sheet with a width Wf1, the third feeding coaxial line 13 is located at the center of the third antenna cavity 1 and near the first antenna cavity 2, the third feeding coaxial line 13 is connected to the third feeding line 11, the third feeding line 11 is square-wave shaped and symmetrically distributed on two sides of the third feeding coaxial line 13, and the length of the third feeding line 11 is Lf1 ═ λ in one square wave periodsWherein Wf1 is 0.04 lambdas。
Specifically, as shown in fig. 5, the S-band coaxial waveguide slot antenna is composed of a waveguide cavity (third antenna cavity 1) shaped like a Chinese character 'ao', a third power feed line 11, a third support foam 12, and a third power feed coaxial line 13. The third antenna cavity 1 is made of aluminum alloy, a closed metal cavity body is formed by a metal surface with a bent upper part, a supporting surface with a bent lower part and cover plates on two sides, and third supporting foam 12 and a third feeder line 11 are sequentially fixed on the lower surface of the third antenna cavity 1 through an adhesive. A part protruding from the upper surface of the third antenna cavity 1 is symmetrically provided with 4 pairs of 8 third waveguide slots 4 along the horizontal direction, and the length Ls1 of the third waveguide slot 4 is 0.5 λ S (λ S is the wavelength corresponding to the S-band operating frequency). The third power feeding line 11 is a bent metal sheet having a width Wf1 and symmetrical to the left and right, and a vertical portion of the third power feeding line 11 located below the third waveguide slot 4 excites the third waveguide slot 4, thereby achieving an effect of radiating electromagnetic waves. The total length Lf1 of the bends of the third feed line 11 from 1 pair of the third waveguide slots 4 to the adjacent 1 pair of waveguide slots is λ s to ensure that the third waveguide slots 4 can be excited in equal phase. The third feed line 11 is open at both ends and the strip line continues for the length of Le1, acting as an impedance match. The third feeding coaxial line 13 is an input/output interface of the S-band electromagnetic wave signal in the present invention, the third feeding coaxial line 13 is a coaxial line having a characteristic impedance of 50 ohms, an inner conductor of the third feeding coaxial line 13 is welded to the center of the third feeding line 11 through the third supporting foam 12, and an outer conductor of the third feeding coaxial line 13 is welded to the third antenna cavity 1.
The slot antenna in this embodiment is tested, and the obtained test data are shown in fig. 6 to fig. 10, which show that the slot antenna in this embodiment has good radiation performance, specifically as follows:
(1) the slot antenna has good performance that the standing-wave ratio is less than 1.8 within an S-band working frequency band f 1-f 3, wherein f2 is the center frequency of the slot antenna.
(2) The slot antenna is in a C-band working frequency band f 4-f 6, the standing-wave ratio of two polarized antennas is less than 1.8, the slot antenna has good matching performance (generally, the standing-wave ratio of the antenna is less than 2)
(3) The isolation of the two polarized antennas in the slot antenna is less than-30 dB.
The technical solution of the present application is described in detail above with reference to the accompanying drawings, and the present application provides a dual-band multi-polarization common-aperture coaxial waveguide slot antenna, including: the waveguide cavity, the feed strip line and the feed coaxial line; the waveguide cavity comprises a plurality of rectangular antenna cavities, wherein a first antenna cavity and a second antenna cavity are distributed on two sides of the plane of the waveguide cavity at intervals in a sawtooth shape, the first antenna cavity is positioned above the plane, the second antenna cavity is positioned below the plane, a third antenna cavity is coated on the outer side of the second antenna cavity, and the outer walls of two sides of the third antenna cavity are positioned below the two first antenna cavities at equal intervals; the feed strip line is arranged at the bottom of the antenna cavity, and a feed coaxial line is welded on the feed strip line and used for feeding to the feed strip line. Through the technical scheme in this application, provide a dual-band multipolarization bore coaxial waveguide slot antenna altogether, have the integrated level height, the isolation is high, light in weight' S characteristics realize the transmission and the receipt of S wave band and C wave band dual-band, multipolarization electromagnetic wave signal.
The steps in the present application may be sequentially adjusted, combined, and subtracted according to actual requirements.
The units in the device can be merged, divided and deleted according to actual requirements.
Although the present application has been disclosed in detail with reference to the accompanying drawings, it is to be understood that such description is merely illustrative and not restrictive of the application of the present application. The scope of the present application is defined by the appended claims and may include various modifications, adaptations, and equivalents of the invention without departing from the scope and spirit of the application.
Claims (8)
1. A dual-band multi-polarization common-aperture coaxial waveguide slot antenna is characterized by comprising: the waveguide cavity, the feed strip line and the feed coaxial line;
the waveguide cavity comprises a plurality of rectangular antenna cavities, wherein a first antenna cavity and a second antenna cavity are distributed on two sides of the plane of the waveguide cavity at intervals in a sawtooth shape, the first antenna cavity is located above the plane of the waveguide cavity, the second antenna cavity is located below the plane of the waveguide cavity, a third antenna cavity is coated on the outer side of the second antenna cavity, and the outer walls of the two sides of the third antenna cavity are located below the two first antenna cavities at equal intervals;
the feeding strip line is arranged at the bottom of the antenna cavity, the feeding coaxial line is welded on the feeding strip line and is used for feeding power to the feeding strip line, wherein,
the two ends of the antenna cavity are closed cavity bodies, the size of the cross section of the first antenna cavity is W2 multiplied by H2, first waveguide gaps are arranged on the upper surface of the first antenna cavity at equal intervals, the length direction of the first waveguide gaps is vertical to the length direction of the first antenna cavity,
the size of the cross section of the second antenna cavity is W3 XH 3, second waveguide slots are arranged at the center of the upper surface of the second antenna cavity at equal intervals, the length direction of the second waveguide slots is parallel to the length direction of the second antenna cavity,
the size of the cross section of the third antenna cavity is W1 XH 1, third waveguide slits are arranged on the upper surface of the third antenna cavity at equal intervals, and the third waveguide slits are symmetrically arranged on two sides of the second antenna cavity.
2. The dual band multi-polarization common aperture coaxial waveguide slot antenna of claim 1, wherein said slot antenna further comprises: supporting the foam;
the supporting foam is positioned between the bottom of the antenna cavity and the feed strip line;
the feed coaxial line passes through the support foam and the bottom of the antenna cavity and is positioned outside the antenna cavity.
3. The dual band multi-polarization co-aperture coaxial waveguide slot antenna of claim 1, wherein the first waveguide slot has a length Ls 2-0.52c，
Wherein W2 ═ 0.125 λc，H3＝0.1λc，λcThe free space wavelength corresponding to the working frequency of the C-band antenna.
4. The dual band multi-polarization co-aperture coaxial waveguide slot antenna of claim 3, wherein the length of said second waveguide slot is Ls3 ═ 0.5 λc，
Wherein W3 ═ 0.125 λc，H3＝0.1λc。
5. The dual band multi-polarization co-aperture coaxial waveguide slot antenna of claim 4, wherein the length of said third waveguide slot is Ls1 ═ 0.5 λs，
Wherein W1 ═ 0.125 λs，H1＝0.1λs，λsThe wavelength is the free space wavelength corresponding to the working frequency of the S-band vertical polarization antenna.
6. The dual-band multi-polarization co-aperture coaxial waveguide slot antenna of claim 3, wherein the first feeding line in the first antenna cavity is a bent metal sheet with a width Wf2, a central line of the first feeding line is located at a central position in a length direction of the first antenna cavity and perpendicular to the first waveguide slot, bent line sections of the first feeding line are symmetrically arranged at two sides of the central line, and a length of the first feeding line between two adjacent first waveguide slots is Lf2 ═ λ -cWherein Wf2 is 0.04 lambdac，
The first feeding coaxial line is positioned at the central position of the first antenna cavity and is connected with the bent line section below the central line of the first feeding line through a feeding metal sheet, and the difference between the distance Lf21 from the left side of the welding position to the first waveguide gap along the first feeding line and the distance Lf22 from the right side of the welding position to the first waveguide gap along the first feeding line is 0.5 lambdac。
7. The dual band multi-polarization common aperture coaxial waveguide slot antenna of claim 4, wherein the second feeding line in the second antenna cavity is a bent metal plate having a width Wf3, the second feeding coaxial line is located at a central position of the second antenna cavity and connected to the second feeding line through a feeding metal plate,
the second feed line is square-wave-shaped and symmetrically distributed on two sides of the second feed coaxial line, and the length of the second feed line between every two adjacent second waveguide gaps is Lf3 lambdacWherein Wf3 is 0.04 lambdac。
8. The dual-band multi-polarization co-aperture coaxial waveguide slot antenna of claim 5, wherein the third feeding line in the third antenna cavity is a bent metal sheet with width Wf1, the third feeding coaxial line is located at the center of the third antenna cavity and near the first antenna cavity, the third feeding coaxial line is connected to the third feeding line, the third feeding line is square-wave shaped and symmetrically distributed on two sides of the third feeding coaxial line, and the length of the third feeding line is Lf1 ═ λ in a square wave periodsWherein Wf1 is 0.04 lambdas。
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