CN112599983B - Circularly polarized reflective array antenna and radiation unit - Google Patents
Circularly polarized reflective array antenna and radiation unit Download PDFInfo
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- CN112599983B CN112599983B CN202011350426.1A CN202011350426A CN112599983B CN 112599983 B CN112599983 B CN 112599983B CN 202011350426 A CN202011350426 A CN 202011350426A CN 112599983 B CN112599983 B CN 112599983B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/02—Waveguide horns
- H01Q13/0241—Waveguide horns radiating a circularly polarised wave
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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
- H01Q15/14—Reflecting surfaces; Equivalent structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/064—Two dimensional planar arrays using horn or slot aerials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/065—Patch antenna array
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Abstract
The invention discloses a circularly polarized reflective array antenna and a radiation unit, wherein the circularly polarized reflective array antenna comprises: the antenna comprises a dielectric substrate, M multiplied by N microstrip patch units, a grounding metal plate, an air layer between the grounding metal plate and the dielectric substrate and a circularly polarized horn opposite to the upper surface of the dielectric substrate, wherein the M multiplied by N microstrip patch units and the grounding metal plate are periodically arranged on the upper surface of the dielectric substrate; the microstrip patch unit consists of an I-shaped patch and two arc-shaped patches, wherein the two arc-shaped patches are symmetrically distributed at an I-shaped opening of the I-shaped patch; the circular polarization horn is used for forming radiation of circular polarization electromagnetic waves, and M, N are integers which are larger than 2. The circularly polarized reflective array antenna is simple to process, and has wider bandwidth and wider application range compared with the conventional circularly polarized reflective array antenna.
Description
Technical Field
The present invention relates to the field of antenna technology, and more particularly, to a circularly polarized reflective array antenna and a radiating unit.
Background
With the rapid development of the fields of radar detection and satellite communication, the demand for high-gain antennas is more and more extensive, and meanwhile, the planar reflective array antenna is also required to have the characteristics of broadband, high power capacity, beam scanning and the like, and can almost meet all the current demands for high-gain antennas.
The concept of the planar reflective array antenna is rooted in two conventional high gain antennas, i.e., a parabolic antenna and a microstrip array antenna. The parabolic antenna is composed of a reflecting surface and an air feed system, the design method is simple, and the working efficiency is high; however, the reflecting surface is a curved surface, which has high requirements on the processing precision in a high-frequency section, is difficult to produce, and has a huge and heavy appearance. The microstrip array antenna has the advantages of low profile, low cost, small size and the like, but the feed network is complex, the power consumption is large, and the bandwidth is narrow.
The planar reflective array antenna well combines the advantages of the planar reflective array antenna and the planar reflective array antenna: the array is fed by adopting a space feeding mode, so that a complex feeding network is avoided, and the higher working efficiency of the antenna is ensured; the microstrip patch is used as an array unit, so that the defects of large volume and heaviness of paraboloidal metal are avoided, and the microstrip patch has the advantages of low profile, low cost, easiness in processing and the like. The disadvantage of the planar reflective array antenna is the narrow operating band due to the narrow band characteristic of the microstrip element on the one hand and the variation of the spatial phase delay difference with frequency on the other hand. Therefore, the research on the reflective array antenna is mainly directed to the disadvantage, and focuses on the study of the bandwidth characteristics of the reflective array.
At present, the dual-frequency, multi-frequency technology and broadband technology of the linear polarization reflective array tend to be mature, but the research on the circular polarization reflective array is limited to the dual-frequency and multi-frequency field, and the research on the broadband technology of the circular polarization reflective array is not much. And the anti-interference performance of circular polarization is stronger, and compared with a linear polarization antenna, the circular polarization antenna is more suitable for various severe environments. With the development of the fields of satellite communication, space exploration and the like, the requirement of the broadband circularly polarized reflective array is more extensive.
Disclosure of Invention
In view of the above, the present invention is directed to a circular polarization reflectarray antenna and a radiation unit, which are simple to process, and have a wider bandwidth and a wider application range compared to the conventional circular polarization reflectarray antenna.
In view of the above, the present invention provides a circularly polarized reflectarray antenna, comprising: the antenna comprises a dielectric substrate, M multiplied by N microstrip patch units, a grounding metal plate, an air layer between the grounding metal plate and the dielectric substrate and a circularly polarized horn opposite to the upper surface of the dielectric substrate, wherein the M multiplied by N microstrip patch units and the grounding metal plate are periodically arranged on the upper surface of the dielectric substrate;
the microstrip patch unit consists of an I-shaped patch and two arc-shaped patches, wherein the two arc-shaped patches are symmetrically distributed at an I-shaped opening of the I-shaped patch;
the circular polarization horn is used for forming radiation of circular polarization electromagnetic waves, and M, N are integers which are larger than 2.
The I-shaped patch is composed of two opposite arc metal sheets and a straight metal sheet connecting the central points of the two arc metal sheets.
The two opposite arc metal sheets of the I-shaped patch and the two arc patches form a circular ring; or
The two arc-shaped patches are arranged in a circular ring formed by the two opposite arc-shaped metal sheets; or
The two arc-shaped patches are arranged outside a circular ring formed by the two opposite arc-shaped metal sheets.
The circularly polarized horn comprises a rectangular-circular waveguide transition section, a circular polarizer and a horn mouth diameter surface which are connected in sequence; wherein the content of the first and second substances,
the circular polarizer is internally provided with a dovetail-shaped medium insert which forms an included angle of 45 degrees with the long side of the rectangular waveguide and is used for differentiating the linear polarization electric field output by the rectangular-circular waveguide transition section into two orthogonal waveguide modes with equal amplitude and 90-degree phase difference.
Wherein, the inner wall of the circular polarizer is provided with two narrow grooves for fixing the medium insert, and
the inner wall of the circular polarizer is also provided with two compensation grooves, and the plane of the two compensation grooves is orthogonal to the plane of the two narrow grooves.
The present invention also provides a radiation unit comprising: the microstrip patch antenna comprises a dielectric substrate, a microstrip patch unit arranged on the upper surface of the dielectric substrate, a grounding metal plate and an air layer between the grounding metal plate and the dielectric substrate;
the microstrip patch unit is composed of an I-shaped patch and two arc-shaped patches, and the two arc-shaped patches are symmetrically distributed at an I-shaped opening of the I-shaped patch.
The circularly polarized reflective array antenna in the technical scheme of the invention comprises: the antenna comprises a dielectric substrate, M multiplied by N microstrip patch units, a grounding metal plate, an air layer between the grounding metal plate and the dielectric substrate and a circularly polarized horn opposite to the upper surface of the dielectric substrate, wherein the M multiplied by N microstrip patch units and the grounding metal plate are periodically arranged on the upper surface of the dielectric substrate; the microstrip patch unit consists of an I-shaped patch and two arc-shaped patches, wherein the two arc-shaped patches are symmetrically distributed at an I-shaped opening of the I-shaped patch; the circularly polarized horn is used for forming radiation of circularly polarized electromagnetic waves. The I-shaped patch and the arc-shaped patch of the microstrip single chip are easy to process, so that the circularly polarized reflective array antenna is simpler to process compared with the conventional circularly polarized reflective array antenna, and experiments prove that the circularly polarized reflective array antenna has the characteristics of ultra wide band and wider application range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic three-dimensional overall view of a circular polarization reflective array antenna according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a radiation unit according to an embodiment of the present invention;
fig. 3 is a graph illustrating a variation of reflection coefficient and frequency of a circular polarization reflective array antenna according to an embodiment of the present invention;
fig. 4 and 5 are schematic structural diagrams of a circularly polarized loudspeaker according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
It is to be noted that technical terms or scientific terms used in the embodiments of the present invention should have the ordinary meanings as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
The technical solution of the embodiments of the present invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a microstrip reflective array 101 and a circularly polarized horn 102 opposite to the microstrip reflective array 101;
the circular polarized horn 102 is used for forming radiation of circular polarized electromagnetic waves, M, N is an integer greater than 2.
The microstrip reflective array 101 includes: the microstrip patch antenna comprises a dielectric substrate, M multiplied by N microstrip patch units periodically arranged on the upper surface of the dielectric substrate, a grounding metal plate and an air layer between the grounding metal plate and the dielectric substrate; wherein M, N are each integers greater than 2.
The microstrip patch unit is composed of an I-shaped patch and two arc-shaped patches, and the two arc-shaped patches are symmetrically distributed at an I-shaped opening of the I-shaped patch.
Specifically, the I-shaped patch is composed of two opposite arc metal sheets and a straight metal sheet connecting the center points of the two arc metal sheets. Two opposite arc metal sheets of the I-shaped patch and the two arc patches form a circular ring.
Or the two arc patches are arranged in a circular ring formed by the two opposite arc metal sheets (namely the radius of the circular ring where the two arc patches are arranged is smaller than that of the circular ring where the two opposite arc metal sheets are arranged, and the centers of the two circular rings are matched); or the two arc patches are arranged outside the circular ring formed by the two opposite arc metal sheets (namely, the radius of the circular ring where the two arc patches are arranged is larger than that of the circular ring where the two opposite arc metal sheets are arranged, and the centers of the two circular rings are matched). Therefore, the coupling strength of the microstrip patch unit can be improved by changing the position between the arc metal sheet of the I-shaped patch and the arc patch adjacent to the arc metal sheet, so that the distribution of resonant frequency points is adjusted, and the broadband/multiband working antenna is obtained.
Preferably, the microstrip patch units on the dielectric substrate are logically arranged according to a set formula. That is, radiation of vortex electromagnetic waves can be formed by arranging the microstrip patch units according to a certain formula logic, electromagnetic wave energy is focused by means of the property of the Bessel function, and diffraction-free vortex electromagnetic waves are formed.
Specifically, in order to reflect the quasi-spherical wave emitted from the circularly polarized horn after phase compensation by the electromagnetic surface of the microstrip reflection array 101 to form a high-order bessel beam carrying OAM (orbital angular momentum) pointing to the + z direction, the phase compensation ψ required by the microstrip patch element of the m-th row and n-th column on the electromagnetic surface ismnThe calculation formula is as follows:
wherein d ismnIs the phase center of the horn antenna to the center position (x) of the microstrip patch unit of the mth row and nth columnmn，ymn) Distance between, k0Is the wave number of the electromagnetic wave in free space,
the azimuth angle corresponding to the microstrip patch unit in the mth row and the nth column, l is the expected OAM mode, and theta is the vertex angle of the Bessel beam.
The air layer is arranged between the dielectric substrate and the grounding metal plate, and the narrow-band characteristic of the microstrip reflective array 101 can be effectively improved by reasonably adjusting the thickness of the air layer.
Specifically, the circularly polarized horn is opposite to the upper surface of the dielectric substrate, and a distance between the circularly polarized horn and the upper surface of the dielectric substrate is a focal length of the circularly polarized reflectarray antenna.
An embodiment of the present invention provides a radiation unit, as shown in fig. 2, including: a dielectric substrate 204, the microstrip patch unit 203 as described above disposed on the upper surface of the dielectric substrate, a grounding metal plate 206, and an air layer 205 between the grounding metal plate and the dielectric substrate;
namely, the microstrip patch unit 203 in the radiation unit is composed of an i-shaped patch and two arc-shaped patches, and the two arc-shaped patches are symmetrically distributed at an i-shaped opening of the i-shaped patch.
In the microstrip patch unit 203 of the radiation unit, the i-shaped patch is specifically composed of two opposite arc metal sheets and a straight metal sheet connecting the center points of the two arc metal sheets. Two opposite arc metal sheets of the I-shaped patch and the two arc patches form a circular ring.
Or the two arc patches are arranged in a circular ring formed by the two opposite arc metal sheets (namely the radius of the circular ring where the two arc patches are arranged is smaller than that of the circular ring where the two opposite arc metal sheets are arranged, and the centers of the two circular rings are matched); or the two arc patches are arranged outside the circular ring formed by the two opposite arc metal sheets (namely, the radius of the circular ring where the two arc patches are arranged is larger than that of the circular ring where the two opposite arc metal sheets are arranged, and the centers of the two circular rings are matched). Therefore, the coupling strength of the microstrip patch unit can be improved by changing the position between the arc metal sheet of the I-shaped patch and the arc patch adjacent to the arc metal sheet, so that the distribution of resonant frequency points is adjusted, and the broadband/multiband working antenna is obtained.
The M × N radiation units arranged periodically may form the microstrip reflective array 101; the radiating elements in the microstrip reflective array 101 may be logically arranged according to a set formula. That is, radiation of vortex electromagnetic waves can be formed by arranging the microstrip patch units according to a certain formula logic, electromagnetic wave energy is focused by means of the property of the Bessel function, and diffraction-free vortex electromagnetic waves are formed.
Specifically, in order to reflect the quasi-spherical wave emitted from the circularly polarized horn after phase compensation by the electromagnetic surface of the microstrip reflection array 101 to form a high-order bessel beam carrying OAM (orbital angular momentum) pointing to the + z direction, the phase compensation ψ required by the microstrip patch element of the m-th row and n-th column on the electromagnetic surface ismnThe calculation formula is as follows:
wherein d ismnIs the phase center of the horn antenna to the center position (x) of the microstrip patch unit of the mth row and nth columnmn，ymn) Distance between, k0Is the wave number of the electromagnetic wave in free space,
the azimuth angle corresponding to the microstrip patch unit in the mth row and the nth column, l is the expected OAM mode, and theta is the vertex angle of the Bessel beam.
Fig. 3 shows that the-15 dB bandwidth is 22.09GHz when the center frequency of the circularly polarized reflective array antenna provided by the embodiment of the present invention is 30GHz, the band range of 20.24GHz-42.33GHz is covered, and the relative bandwidth reaches 73.6%, so that the circularly polarized reflective array antenna provided by the embodiment of the present invention has the characteristic of ultra wide band.
The circularly polarized horn 102, as shown in fig. 4 and 5, includes a rectangular-circular waveguide transition section 3, a circular polarizer 2, and a horn mouth diameter surface 1 connected in sequence.
Wherein, the cross section of the inner wall of the port (first port) 12 at one end of the rectangular-circular waveguide transition section 3 is rectangular, and the cross section of the inner wall of the port (second port) 11 at the other end is circular; the cross section of the inner wall between the two ports of the rectangular-circular waveguide transition section 3 is smoothly transited from a rectangle to a circle through a continuous curve, so as to complete the conversion from the rectangular waveguide main mode TE10 mode working at a specified frequency band to the circular waveguide main mode TE11 mode.
The circular polarizer 2 is connected with the second port 11 of the rectangular-circular waveguide transition section 3, wherein the radius of the circular section of the inner wall of the circular polarizer 2 is equal to that of the circular section of the inner wall of the second port 11 connected with the circular polarizer;
preferably, the cross section of the outer wall of the rectangular-circular waveguide transition section 3 is circular, and the radius of the circular cross section of the outer wall of the rectangular-circular waveguide transition section 3 is equal to the radius of the circular cross section of the outer wall of the circular polarizer 2.
Preferably, the circular polarization horn 102 may further include: and the flange plate 6 and the flange plate 7 are used for combining and fixing the rectangular-circular waveguide transition section 3 and the circular polarizer 2.
Preferably, the circular polarization horn 102 may further include: and a base 8 arranged at the first port 12 of the rectangular-circular waveguide transition section 3.
The cross section of the inner wall of the circular polarizer 2 is circular, and a medium insert 13 having an included angle of 45 degrees with the long side of the rectangular waveguide is arranged in the circular polarizer 2 and used for dividing a linear polarization electric field output by the rectangular-circular waveguide transition section into two orthogonal waveguide modes with equal amplitude and 90-degree phase difference so as to realize circular polarization performance.
Preferably, the media insert 13 is a dovetail media insert. Specifically, the media insert 13 may be composed of a pair of dovetail-shaped media plates, and the dovetail openings of the pair of dovetail-shaped media plates face the ports of the circular polarizer 2.
Preferably, the media insertion piece 13 can be fixed by two narrow slots 10 and 14 formed on the inner wall of the circular polarizer 2, that is, two edges of the media insertion piece 13 are caught in the two narrow slots 10 so that the media insertion piece 13 is fixed in the circular polarizer 2.
Furthermore, the inner wall of the circular polarizer 2 is also provided with two compensation grooves, and the planes of the two compensation grooves are orthogonal to the plane of the two narrow grooves so as to balance the influence of the two narrow grooves on the inner wall of the circular polarizer 2; in fig. 5, one compensation groove is indicated at 9. The axial ratio bandwidth is effectively widened through the compensation groove, and the feed source requirement of the broadband reflection array is met.
The narrow-mouth end of the horn mouth diameter surface 1 is connected with the circular polarizer 2, and the radius of the inner wall of the narrow-mouth end of the horn mouth diameter surface 1 is equal to that of the inner wall of the circular polarizer 2.
Preferably, the circular polarized horn 102 may further include: and a flange plate 4 and a flange plate 5 for combining and fixing the bell mouth diameter surface 1 and the circular polarizer 2.
The circularly polarized reflective array antenna in the technical scheme of the invention comprises: the antenna comprises a dielectric substrate, M multiplied by N microstrip patch units, a grounding metal plate, an air layer between the grounding metal plate and the dielectric substrate and a circularly polarized horn opposite to the upper surface of the dielectric substrate, wherein the M multiplied by N microstrip patch units and the grounding metal plate are periodically arranged on the upper surface of the dielectric substrate; the microstrip patch unit consists of an I-shaped patch and two arc-shaped patches, wherein the two arc-shaped patches are symmetrically distributed at an I-shaped opening of the I-shaped patch; the circularly polarized horn is used for forming radiation of circularly polarized electromagnetic waves. The I-shaped patch and the arc-shaped patch of the microstrip single chip are easy to process, so that the circularly polarized reflective array antenna is simpler to process compared with the conventional circularly polarized reflective array antenna, and experiments prove that the circularly polarized reflective array antenna has the characteristics of ultra wide band and wider application range.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
In addition, well known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures for simplicity of illustration and discussion, and so as not to obscure the invention. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the present invention is to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the invention, it should be apparent to one skilled in the art that the invention can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (6)
1. A circularly polarized reflectarray antenna, comprising: the antenna comprises a dielectric substrate, M multiplied by N microstrip patch units, a grounding metal plate, an air layer between the grounding metal plate and the dielectric substrate and a circularly polarized horn opposite to the upper surface of the dielectric substrate, wherein the M multiplied by N microstrip patch units and the grounding metal plate are periodically arranged on the upper surface of the dielectric substrate;
the microstrip patch unit consists of an I-shaped patch and two arc-shaped patches, wherein the two arc-shaped patches are symmetrically distributed at an I-shaped opening of the I-shaped patch; the I-shaped patch is composed of two opposite arc metal sheets and a straight metal sheet connecting the central points of the two arc metal sheets; the two opposite arc-shaped metal sheets of the I-shaped patch and the two arc-shaped patches form a circular ring; or the two arc-shaped patches are arranged in a circular ring formed by the two opposite arc-shaped metal sheets;
the circular polarization horn is used for forming radiation of circular polarization electromagnetic waves, and M, N are integers which are larger than 2.
2. The circularly polarized reflectarray antenna of claim 1,
phase compensation psi of microstrip patch unit in mth row and nth column on the dielectric substratemnThe formula is as follows:
wherein d ismnIs the phase center of the circularly polarized horn to the center position (x) of the microstrip patch unit of the mth row and the nth columnmn，ymn) Distance between, k0Is the wave number of the electromagnetic wave in free space,
the azimuth angle corresponding to the microstrip patch unit in the mth row and the nth column, l is the expected OAM mode, and theta is the vertex angle of the Bessel beam.
3. The circularly polarized reflectarray antenna of claim 1, wherein the circularly polarized horn comprises a rectangular-circular waveguide transition section, a circular polarizer, and a horn aperture surface connected in series; wherein the content of the first and second substances,
the circular polarizer is internally provided with a dovetail-shaped medium insert which forms an included angle of 45 degrees with the long side of the rectangular waveguide and is used for differentiating the linear polarization electric field output by the rectangular-circular waveguide transition section into two orthogonal waveguide modes with equal amplitude and 90-degree phase difference.
4. The circularly polarized reflectarray antenna of claim 3, wherein the inner wall of the circular polarizer is formed with two slots for holding the dielectric patch, and
the inner wall of the circular polarizer is also provided with two compensation grooves, and the plane of the two compensation grooves is orthogonal to the plane of the two narrow grooves.
5. The circularly polarized reflectarray antenna of claim 1,
and the distance between the circularly polarized loudspeaker and the upper surface of the dielectric substrate is the focal length of the microstrip reflective array antenna.
6. A radiating element, comprising: the microstrip patch antenna comprises a dielectric substrate, a microstrip patch unit arranged on the upper surface of the dielectric substrate, a grounding metal plate and an air layer between the grounding metal plate and the dielectric substrate;
the microstrip patch unit consists of an I-shaped patch and two arc-shaped patches, wherein the two arc-shaped patches are symmetrically distributed at an I-shaped opening of the I-shaped patch; the I-shaped patch is composed of two opposite arc metal sheets and a straight metal sheet connecting the central points of the two arc metal sheets; the two opposite arc-shaped metal sheets of the I-shaped patch and the two arc-shaped patches form a circular ring; or the two arc patches are arranged in a circular ring formed by the two opposite arc metal sheets.
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| CN113823904B (en) * | 2021-08-03 | 2022-12-09 | 清华大学 | E-band high-gain planar reflective array antenna |
| CN114552168A (en) * | 2022-04-07 | 2022-05-27 | 厦门大学 | Dual-band inverted-F-shaped structure ground mode radiation OAM antenna |
| CN114843761B (en) * | 2022-04-13 | 2023-03-24 | 南昌大学 | Airborne microwave radiometer antenna based on circular polarization |
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