CN116365219A - Ultra-small radiation caliber radiating unit and ultra-low sidelobe square antenna - Google Patents
Ultra-small radiation caliber radiating unit and ultra-low sidelobe square antenna Download PDFInfo
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- CN116365219A CN116365219A CN202310407444.6A CN202310407444A CN116365219A CN 116365219 A CN116365219 A CN 116365219A CN 202310407444 A CN202310407444 A CN 202310407444A CN 116365219 A CN116365219 A CN 116365219A
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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
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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
- 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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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses an ultra-small radiation caliber radiating unit and an ultra-low sidelobe square antenna, wherein the ultra-small radiation caliber radiating unit comprises a radiating piece, a coaxial line body, a grounding base and a reflecting plate, the radiating piece comprises a first radiating piece and a second radiating piece which are connected in an orthogonal mode, the coaxial line body is connected with the first radiating piece and the second radiating piece respectively, the reflecting plate is located below the radiating piece, the ultra-small radiation caliber radiating unit further comprises a guide piece and a hanging piece, the guide piece is arranged right above the radiating piece, the horizontal section of the guide piece is of a central symmetrical structure, and the hanging piece is vertically connected to the first radiating piece and/or the second radiating piece. The ultra-low sidelobe square antenna comprises the ultra-small radiation aperture radiating element. The invention can increase the radiation bandwidth, reduce the radiation caliber, has higher side lobe suppression capability and can effectively suppress the adjacent cell interference.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to an ultra-small radiation caliber radiating unit and an ultra-low sidelobe square antenna.
Background
With the development of society, people have higher requirements on communication quality, and the application scenes of antennas are more and more, for venues with larger space such as natatorium and football stadium, in order for the signals sent by the antennas to better cover the whole venue, a large area is often required to be divided into a plurality of small areas for regional distribution, and antennas are placed in each small area to form signal full coverage. In order to achieve better directivity, the radiation unit of the existing antenna generally controls the distance between the radiation unit and the reflecting plate within a certain range, and in order to enhance the radiation intensity, the radiation plane area needs to be increased, so that the radiation unit has the defects of weaker low frequency, narrower bandwidth and larger radiation caliber, the array space of the radiation unit is affected by larger radiation caliber, the antenna formed by the array by using the radiation unit has larger volume, the sidelobe suppression capability is weaker, and for venues with large crowd density and large signal traffic, the uplink interference of the antenna is obvious, the signal overlap is serious, and better radiation performance is difficult to realize.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the ultra-small radiation caliber radiating unit which can increase the radiation bandwidth and reduce the radiation caliber.
In order to solve the technical problems, the invention provides an ultra-small radiation caliber radiating unit which comprises a radiating piece, a coaxial line body, a grounding base and a reflecting plate, wherein the radiating piece comprises a first radiating piece and a second radiating piece which are in orthogonal connection, the coaxial line body is respectively connected with the first radiating piece and the second radiating piece, the grounding base is respectively connected with the first radiating piece and the second radiating piece, and the reflecting plate is positioned below the radiating piece.
The ultra-small radiation caliber radiating unit further comprises a guiding piece and a hanging piece, wherein the guiding piece is arranged right above the radiating piece, the horizontal section of the guiding piece is of a central symmetry structure, and the hanging piece is vertically connected to the first radiating piece and/or the second radiating piece.
As a modification of the above, the horizontal cross section of the guide member is circular or polygonal.
As an improvement of the above-mentioned scheme, the height from the guide member to the radiation member is H, and the height from the radiation member to the reflection plate is H, wherein H: h is more than or equal to 0.9.
As the improvement of above-mentioned scheme, first radiation piece with the second radiation piece all includes left radiation portion and the right radiation portion that the symmetry set up, left radiation portion with coaxial line body coupling, right radiation portion with ground connection base is connected, left radiation portion with all be equipped with the fretwork hole in the right radiation portion.
As an improvement of the scheme, the hollowed-out holes are round holes, and the first radiation piece and the second radiation piece are connected in a cross mode to form an X-shaped structure.
As an improvement of the scheme, the hanging piece is in a long column shape, one end of the left radiating portion is connected with the coaxial line body, one end of the right radiating portion is connected with the grounding base, and the other end of the left radiating portion and/or the other end of the right radiating portion is/are vertically connected with the hanging piece.
As an improvement of the scheme, the grounding base comprises a base body and a grounding wire body, one end of the grounding wire body is vertically fixed on the base body, the other end of the grounding wire body is connected with the radiation piece, and the base body is fixed on the reflecting plate.
The invention also aims to solve the technical problem of providing the ultralow sidelobe square antenna which is small in size, light in weight and high in sidelobe suppression capability and can effectively suppress adjacent cell interference.
In order to solve the technical problem, the invention also provides an ultra-low sidelobe square antenna, which comprises a plurality of ultra-small radiation caliber radiating units, wherein the ultra-small radiation caliber radiating units are mutually arranged into a plurality of arrays which are arranged from inside to outside at intervals, and the arrays form a cross-shaped axisymmetric plane structure.
As an improvement of the scheme, the ultralow sidelobe square antenna comprises a first array, a second array and a third array which are sequentially arranged from inside to outside;
the first array comprises 4 first radiating units, the 4 first radiating units are equally arranged in a 'field' shape, and a gap between two adjacent first radiating units is a separation space;
the second array comprises 4 second radiating units, the 4 second radiating units are respectively arranged at the side parts of the space, and the distance from each second radiating unit to the center of the first array is equal;
the third array comprises 4 third radiating elements, each third radiating element is positioned on an extension line of a connecting line between the center of the first array and each second radiating element, and the distances from each third radiating element to the center of the first array are equal;
the feed amplitudes to which the first, second and third arrays are subjected gradually decrease.
As an improvement of the scheme, the distance between the first radiation unit, the second radiation unit and the third radiation unit is in the range of 0.4λ -0.7λ, where λ is the wavelength of the central working frequency of the ultralow sidelobe square antenna;
the first, second and third radiating elements receive feed amplitude ratios of (24-48): (1.5-3): 1, a step of;
the feed phases received by the first radiation unit and the second radiation unit are the same, and the feed phase received by the third radiation unit and the first radiation unit are 180 degrees different.
The implementation of the invention has the following beneficial effects:
the ultra-small radiation caliber radiating unit is provided with a radiating element, a coaxial line body, a hanging piece, a grounding base, a reflecting plate and a guiding piece, wherein the radiating element comprises a first radiating piece and a second radiating piece which are connected in an orthogonal mode, the reflecting plate is positioned below the radiating element, the guiding piece is arranged right above the radiating element, the guiding piece, the first radiating piece and the second radiating piece are positioned above the reflecting plate and participate in radiation jointly, the guiding piece is arranged right above the radiating element, therefore, the combination of the guiding piece and the radiating piece can form a vibrator with a space structure, the hanging piece is vertically connected to the first radiating piece and/or the second radiating piece, a radiating plane can be converted into a vertical plane from a horizontal plane, compared with the traditional plane structure, the physical height of the vibrator can be increased, the range of the vibrator from the reflecting plate is enlarged, and the side lobe is wider than the reflecting plate in a certain height range, the ultra-small diameter of the vibrator is wider than the radiating element, the ultra-small diameter of the ultra-small vibrator can be effectively radiated by the ultra-small vibrator, the ultra-small vibrator is more effective than the vibrator with the small diameter of the small vibrator, and the ultra-small diameter radiation caliber radiating unit can be effectively reduced, and the radiation caliber of the ultra-small vibrator can be effectively radiated by the small vibrator is reduced.
And because the caliber of the radiation piece is reduced, the ultra-low sidelobe square antenna formed by a plurality of ultra-small radiation caliber radiation unit arrays is small in size and light in weight, and meanwhile, the distance between the radiation units cannot be limited by the overlarge caliber of the radiation piece, so that the distance between the ultra-small radiation caliber radiation units can be more flexible to take value, grating lobes can be eliminated as much as possible by combining ultra-small caliber radiation, and better sidelobe suppression can be realized, and adjacent cell interference can be effectively suppressed.
Drawings
FIG. 1 is a schematic diagram of the structure of a radiation unit with ultra-small radiation caliber at a first view angle;
FIG. 2 is a schematic diagram of the structure of a second view angle of the ultra-small caliber radiating element of the present invention;
FIG. 3 is a schematic view of the structure of the radiator of the present invention;
FIG. 4 is a radiation perspective view of an ultra-small radiation caliber radiating element of the present invention;
fig. 5 is a schematic layout of an ultra-low sidelobe square antenna of the present invention;
fig. 6 is a pattern of an ultra-low sidelobe square antenna of the present invention;
fig. 7 is a shaped perspective view of the ultra-low sidelobe square antenna of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent. It is only stated that the terms of orientation such as up, down, left, right, front, back, inner, outer, etc. used in this document or the imminent present invention, are used only with reference to the drawings of the present invention, and are not meant to be limiting in any way.
Referring to fig. 1 and 4, the embodiment of the invention discloses a radiation unit 10 with ultra-small radiation caliber, which comprises a radiation piece 1, a coaxial line body 2, a grounding base 3 and a reflecting plate 4, wherein the radiation piece 1 comprises a first radiation piece 11 and a second radiation piece 12 which are orthogonally connected, the first radiation piece 11 and the second radiation piece 12 form a plane structure, the coaxial line body 2 is respectively connected with the first radiation piece 11 and the second radiation piece 12, the coaxial line body 2 is used for receiving signals, the signals are transmitted to the first radiation piece 11 and the second radiation piece 12 through the coaxial line body 2, the grounding base 3 is respectively connected with the first radiation piece 11 and the second radiation piece 12, the grounding base is used for grounding the first radiation piece 11 and the second radiation piece 12, the anti-interference capability and the lightning protection capability are enhanced, and the reflecting plate 4 is positioned below the radiation piece 1. The ultra-small radiation caliber radiating unit 10 further comprises a guiding piece 5, the guiding piece 5 is arranged right above the radiating piece 1, the guiding piece 5 can be coupled with the radiating piece 1 to form a spatial relationship of an upper structure and a lower structure, so that the radiating piece 1 with a planar structure is converted into a vibrator with a spatial structure, compared with the vibrator with a traditional planar structure, the vibrator with the spatial structure has the advantages that the physical height is increased, the radiation bandwidth can be increased, and the caliber of the radiating piece 1 is reduced under the condition that the effective electric length is increased. The horizontal section of the guide member 5 is of a central symmetrical structure, so that the radiation uniformity in all directions can be ensured. The ultra-small radiation caliber radiating unit 10 further comprises a hanging piece 6, wherein the hanging piece 6 is vertically connected to the first radiating piece 11 and/or the second radiating piece 12, and the hanging piece 6 can further convert a radiation plane from a horizontal plane to a vertical plane, so that the effective electric length is increased.
The embodiment of the invention has the following beneficial effects:
the ultra-small radiation caliber radiating unit 10 is provided with a radiating element 1, a coaxial line body 2, a hanging piece 6, a grounding base 3, a reflecting plate 4, a guiding piece 5 and the hanging piece 6, wherein the radiating element 1 comprises a first radiating piece 11 and a second radiating piece 12 which are orthogonally connected, the reflecting plate 4 is positioned below the radiating element 1, the guiding piece 5 is positioned right above the radiating element 1, the guiding piece 5, the first radiating piece 11 and the second radiating piece 12 are positioned above the reflecting plate 4 and participate in radiation together, the guiding piece 5 is arranged right above the radiating element 1, therefore, the combination of the guiding piece 5 and the radiating element 1 can form a vibrator with a space structure, the hanging piece 6 is vertically connected to the first radiating piece 11 and/or the second radiating piece 12, compared with the vibrator with the traditional plane structure, the invention can increase the physical height of the vibrator, thereby expanding the height range of the vibrator from the reflecting plate 4, and the radiation bandwidth can be increased by the ultra-small radiation caliber radiating unit 10 because the vibrator has a higher vibrator surface from the reflecting plate 4 and a wider bandwidth and a longer effective electric length, and the caliber of the radiating element 1 of the space structure vibrator is smaller than the caliber of the radiating element 1 of the plane structure vibrator under the condition of the same effective electric length due to the physical height increase of the vibrator, so that ultra-small caliber radiation is realized, side lobe reduction is facilitated, and better side lobe suppression is realized.
And because the caliber of the radiation piece 1 is reduced, the ultra-low sidelobe square antenna formed by a plurality of ultra-small radiation caliber radiation units 10 after being arrayed is small in size and light in weight, and meanwhile, the distance between the radiation units cannot be limited by the caliber of the radiation piece 1, the distance between the ultra-small radiation caliber radiation units 10 can be more flexible to take value, grating lobes can be eliminated as much as possible by combining ultra-small caliber radiation, so that better sidelobe suppression is realized, and adjacent cell interference is effectively suppressed.
Referring to fig. 2, in the embodiment of the present invention, the horizontal cross section of the guiding member 5 is circular or polygonal, which can generate a better coupling effect with the radiating member 1. In addition, the height from the guide member 5 to the radiation member 1 is H, and the height from the radiation member 1 to the reflection plate 4 is H, in the embodiment of the present invention, H: h is not less than 0.9, if H: h < 0.9, when the height from the radiating member 1 to the reflecting plate 4 is too small, the impedance of the vibrator becomes capacitive, which is disadvantageous for resonance generation, and when the height from the guide member 5 to the radiating member 1 is too large, the directivity of the radiation pattern becomes poor.
Referring to fig. 3, the first radiation piece 11 and the second radiation piece 12 each include a left radiation portion 13 and a right radiation portion 14 that are symmetrically disposed, the left radiation portion 13 is connected with the coaxial line body 2, the right radiation portion 14 is connected with the grounding base 3, in this embodiment of the present invention, the left radiation portion 13 and the right radiation portion 14 are symmetrical structures, and hollow holes 15 are disposed in each of the left radiation portion 13 and the right radiation portion 14, and the hollow holes 15 are disposed to enable the vibrator to more easily converge to a 50Ω impedance, so that maximum power transmission can be achieved, and weight can be further reduced. In the embodiment of the present invention, the hollowed-out hole 15 is a circular hole, and in other embodiments, may be a polygonal hole, and the first radiation sheet 11 and the second radiation sheet 12 are cross-connected to form an "X" structure.
The hanging piece 6 is in a long column shape, one end of the left radiating portion 13 is connected with the coaxial line body 2, one end of the right radiating portion 14 is connected with the grounding base 3, and the other end of the left radiating portion 13 and/or the other end of the right radiating portion 14 is vertically connected with the hanging piece 6. In the embodiment of the present invention, the other end of the left radiating portion 13 and the other end of the right radiating portion 14 are both vertically connected with the hanging member 6, and the hanging member 6 is preferably a metal member, so that radiation can be participated, and the effective electrical length can be further increased by combining with the guiding sheet, so that the plane area of the radiating member 1 is greatly reduced, the radiation caliber is reduced, the convergence of the radiation beam width is good, and the radiation efficiency is high. In the embodiment of the present invention, the hanging pieces 6 are connected to the outer corners of the left radiating portion 13 and the right radiating portion 14, that is, the number of hanging pieces 6 is 4, and in other embodiments, the number of hanging pieces 6 may be adjusted according to performance requirements to meet different circuit requirements and radiation indexes.
The grounding base 3 comprises a base body 31 and a grounding wire body 32, one end of the grounding wire body 32 is vertically fixed on the base body 31, the other end of the grounding wire body is connected with the radiating element 1, so that the radiating element 1 is grounded, and the base body 31 is fixed on the reflecting plate 4.
Referring to fig. 5 to fig. 7, the embodiment of the present invention further discloses an ultra-low sidelobe square antenna, which includes a plurality of ultra-small radiation aperture radiating elements 10 as described above, wherein a plurality of the ultra-small radiation aperture radiating elements 10 are mutually spaced and arranged into a plurality of arrays which are arranged from inside to outside, and the plurality of arrays form a cross-shaped axisymmetric plane structure. The ultra-small radiation caliber radiating unit 10 has smaller caliber and stronger sidelobe suppression capability, so that the ultra-low sidelobe square antenna has small volume and light weight, and can form square beams by adopting a cross-shaped axisymmetric plane structure, thereby being more suitable for regional communication and having excellent capability of suppressing adjacent cell interference.
Specifically, the ultra-low sidelobe square antenna comprises a first array 20, a second array 30 and a third array 40 which are sequentially arranged from inside to outside. The first array 20 includes 4 first radiating elements 201,4, where the first radiating elements 201 are equally arranged in a "field" shape, and a gap between two adjacent first radiating elements 201 is a space therebetween, and the first array 20 is located at the center of the "ten" plane structure. The second array 30 includes 4 second radiating elements 202,4, and the second radiating elements 202 are respectively disposed at the sides of the space, and each of the second radiating elements 202 is equidistant from the center of the first array 20. The third array 40 includes 4 third radiating elements 203, each third radiating element 203 is located on an extension line of a line connecting the center of the first array 20 and each second radiating element 202, and the distances from each third radiating element 203 to the center of the first array 20 are equal. The second array 30 and the third array 40 form 4 "swing arms" of a "cross" planar structure. The first array 20, the second array 30 and the third array 40 are fed with progressively smaller magnitudes. The first array 20, the second array 30 and the third array 40 form an axisymmetric structure, and the distances from each second radiating element 202 to the center of the first array 20 are equal, and the distances from each third radiating element 203 to the center of the first array 20 are equal, so as to provide a condition for shaping square beams.
Further, the distance between the first radiating element 201, the second radiating element 202 and the third radiating element 203 ranges from 0.4λ to 0.7λ, where λ is the wavelength of the central operating frequency of the ultralow sidelobe square antenna. When the distance between the ultra-small radiation caliber radiating elements 10 is smaller than 0.4λ, coupling between the ultra-small radiation caliber radiating elements 10 is more likely to be caused, and overall radiation performance is affected, and when the distance between the ultra-small radiation caliber radiating elements 10 is larger than 0.7λ, the number of side lobes is increased, directivity is deteriorated, and meanwhile, the number of the ultra-small radiation caliber radiating elements 10 is reduced under the same volume, so that radiation effect is affected.
The first radiating element 201, the second radiating element 202 and the third radiating element 203 receive feed amplitude ratios of (24-48): (1.5-3): 1. in addition, the feeding phases received by the first radiating element 201 and the second radiating element 202 are the same, and the feeding phase received by the third radiating element 203 is 180 ° different from the feeding phase received by the first radiating element 201.
In one embodiment, the ratio of the feeding amplitudes received by the first radiating element 201, the second radiating element 202 and the third radiating element 203 is 32:2:1, the feeding phases received by the first radiating element 201 and the second radiating element 202 are 0 °, the feeding phase received by the feeding amplitude of the third radiating element 203 is-180 °, the first radiating element 201 with higher feeding power can obtain better center shaping effect, and meanwhile, better beam convergence capability can be obtained by matching with the configuration of the feeding phases, and better sidelobe suppression capability can be obtained under the condition of forming square beams.
The foregoing is a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention and are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The ultra-small radiation caliber radiating unit is characterized by comprising a radiating piece, a coaxial line body, a grounding base and a reflecting plate, wherein the radiating piece comprises a first radiating piece and a second radiating piece which are orthogonally connected, the coaxial line body is respectively connected with the first radiating piece and the second radiating piece, the grounding base is respectively connected with the first radiating piece and the second radiating piece, and the reflecting plate is positioned below the radiating piece;
the ultra-small radiation caliber radiating unit further comprises a guiding piece and a hanging piece, wherein the guiding piece is arranged right above the radiating piece, the horizontal section of the guiding piece is of a central symmetry structure, and the hanging piece is vertically connected to the first radiating piece and/or the second radiating piece.
2. The ultra-small caliber radiating element of claim 1 wherein the horizontal cross section of the guide member is circular or polygonal.
3. The ultra-small caliber radiating element of claim 1 wherein the height of the guide member to the radiating member is H and the height of the radiating member to the reflector plate is H, wherein H: h is more than or equal to 0.9.
4. The ultra-small radiation caliber radiating unit according to claim 1, wherein the first radiating piece and the second radiating piece comprise a left radiating portion and a right radiating portion which are symmetrically arranged, the left radiating portion is connected with the coaxial line body, the right radiating portion is connected with the grounding base, and hollowed holes are formed in the left radiating portion and the right radiating portion.
5. The ultra-small radiation caliber radiating element according to claim 4, wherein the hollowed-out hole is a circular hole, and the first radiating sheet and the second radiating sheet are cross-connected to form an "X" structure.
6. The ultra-small radiation caliber radiating unit according to claim 4, wherein the hanging piece is long-column-shaped, one end of the left radiating portion is connected with the coaxial line body, one end of the right radiating portion is connected with the grounding base, and the other end of the left radiating portion and/or the other end of the right radiating portion is/are vertically connected with the hanging piece.
7. The ultra-small radiation caliber radiating element according to claim 1, wherein the grounding base comprises a base body and a grounding wire body, one end of the grounding wire body is vertically fixed on the base body, the other end of the grounding wire body is connected with the radiating element, and the base body is fixed on the reflecting plate.
8. An ultra-low sidelobe square antenna, comprising a plurality of ultra-small radiation aperture radiating elements as claimed in any one of claims 1 to 7, wherein a plurality of said ultra-small radiation aperture radiating elements are arranged at intervals to form a plurality of arrays arranged from inside to outside, and the plurality of arrays form a cross-shaped axisymmetric plane structure.
9. The ultra-low sidelobe square antenna of claim 8, wherein said ultra-low sidelobe square antenna comprises a first array, a second array and a third array sequentially arranged from inside to outside;
the first array comprises 4 first radiating units, the 4 first radiating units are equally arranged in a 'field' shape, and a gap between two adjacent first radiating units is a separation space;
the second array comprises 4 second radiating units, the 4 second radiating units are respectively arranged at the side parts of the space, and the distance from each second radiating unit to the center of the first array is equal;
the third array comprises 4 third radiating elements, each third radiating element is positioned on an extension line of a connecting line between the center of the first array and each second radiating element, and the distances from each third radiating element to the center of the first array are equal;
the feed amplitudes to which the first, second and third arrays are subjected gradually decrease.
10. The ultra-low sidelobe square antenna of claim 9, wherein the first radiating element, the second radiating element and the third radiating element have a distance therebetween ranging from 0.4λ to 0.7λ, λ being a wavelength of a center operating frequency of the ultra-low sidelobe square antenna;
the first, second and third radiating elements receive feed amplitude ratios of (24-48): (1.5-3): 1, a step of;
the feed phases received by the first radiation unit and the second radiation unit are the same, and the feed phase received by the third radiation unit and the first radiation unit are 180 degrees different.
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| US20220276369A1 (en) * | 2019-07-24 | 2022-09-01 | Sony Group Corporation | Radar device, processing device, calculation method, and calculation program |
| CN114200448A (en) * | 2021-11-19 | 2022-03-18 | 华中科技大学 | Synthetic aperture radiometer wavenumber domain near-field imaging method and equipment |
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