CN115189121A - Circularly polarized metal cavity antenna, array antenna and preparation method thereof - Google Patents
Circularly polarized metal cavity antenna, array antenna and preparation method thereof Download PDFInfo
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- H—ELECTRICITY
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- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- 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
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
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- H01Q21/00—Antenna arrays or systems
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Abstract
The invention discloses a circularly polarized metal cavity antenna, an array and a preparation method, belonging to the technical field of antennas and comprising a one-to-four metal feed network and four quadrant radiation units, wherein each quadrant radiation unit comprises a radiation cavity, two resonance metal blocks and an L-shaped metal strip, the two resonance metal blocks are symmetrically arranged in the radiation cavity, the radiation cavity is made of metal, the electric field distribution in each radiation cavity is the same, and each radiation cavity is provided with a coupling slit; four radiation holes are formed above each radiation cavity, the L-shaped metal strips are positioned in the radiation holes, and the L-shaped metal strips positioned in the adjacent quadrant radiation units in the clockwise direction are symmetrically arranged after being rotated by 90 degrees clockwise. The circular polarization function of the antenna is realized by rotating the L-shaped metal strip, the structure of a conventional circular polarizer is removed, and the section height of the antenna is greatly reduced.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a circularly polarized metal cavity antenna, an array antenna and a preparation method of the circularly polarized metal cavity antenna and the array antenna.
Background
The circularly polarized antenna is an antenna for transmitting and receiving circularly polarized waves, has the advantages of strong mobility, multipath fading resistance, small faraday influence and the like based on the characteristics of the circularly polarized waves, and is widely applied to the fields of mobile communication, satellite communication, global Positioning System (GPS), radio Frequency Identification (RFID), wireless Local Area Network (WLAN), direct Broadcast television receiving System (DBS), wireless sensors, wireless power transmission and the like.
The common implementation modes of the circularly polarized microstrip antenna are mainly three:
the first is unit-level implementation, which realizes dual circular polarization performance through a proper feeding mode, and then periodically arranges and arrays corresponding antenna units. Reference may be made to the relevant documents Hao-Chun Tung and Kin-Lu Wong, A compact dual-polarized patch antenna for1800MHz band operation [ J ]. Microwave Opt.Tech.Lett.Vol.29,2001, april 5,1-2.
The second is an array-level implementation, that is, by rotating the antenna units, the phase difference between adjacent units is implemented, thereby implementing the circular polarization radiation performance of the antenna units. Reference is made to the relevant documents Huang, J.A. technical for an array to a generator polarized elements [ J ] IEEE trans-ans antennas and amplification, vol.AP-34, no.9, pp.1113-1124, sep.1986.
The third is a hybrid mode, i.e. combining the two implementations to achieve better electrical performance.
The microstrip antenna has the defects of complex structure, difficult processing, easy deformation and low interlayer separation heat conduction performance; the structural strength of the antenna array is low after the antenna array is processed; the manufacturing method is complex and the cost is high.
The circularly polarized waveguide antenna has the advantages of small volume, compact structure, good mechanical strength, high reliability, long service life and the like, and can meet the requirement of circular polarization by controlling the working mode in the waveguide. Meanwhile, the size of the cavity is reduced, and the weight is reduced, so that the antenna becomes one of the preferable schemes of the radar antenna.
In the related art, the diaphragm-type circularly polarized antenna has the characteristics of wide frequency band, small axial ratio, high isolation of circularly polarized ports and small volume, and is widely applied in recent decades. In 1973, a partition type circular polarizer of an S frequency band was designed by Ming Hui Chen and G.N.Tsandoulas based on an odd-even mode theory. Similarly, xing Wang, xiao dong Huang, xiuhua jin. Novel Square/Rectangle wave guide separator, 2016ICUWB,2016.10 proposes a new type of Waveguide circular Polarizer. However, in order to achieve better circular polarization performance, the cross-sectional height of the partition plate is usually more than one wavelength, and the cross-sectional height is high.
The application publication number is CN107394367A, and discloses a millimeter wave half-mode substrate integrated waveguide circularly polarized antenna unit and an array antenna, which comprise a unit body, wherein the unit body comprises a radiation layer unit, a first dielectric layer unit, a feed layer unit, a second dielectric layer unit and a metal grounding layer unit which are sequentially stacked, and a gap structure capable of generating a 90-degree phase difference is arranged on the radiation layer unit; the feed layer unit comprises an impedance transformation line which is arranged corresponding to the gap structure; a half-mode substrate integrated waveguide resonant cavity matched with the gap structure is arranged on the unit body; the resonant frequency of the gap structure and the half-mode substrate integrated waveguide resonant cavity is f1, and the frequency of the coupling of the impedance transformation line and the gap structure is f2.
However, the antenna unit is a half-chip integrated waveguide, and is a waveguide-like structure processed by a microstrip board according to the working mode of the waveguide, rather than a metal waveguide.
Disclosure of Invention
The technical problem to be solved by the invention is how to reduce the profile height of the circularly polarized antenna.
The invention solves the technical problems through the following technical means:
on one hand, the invention provides a circularly polarized metal cavity antenna which comprises a one-to-four metal feed network and four quadrant radiation units, wherein each quadrant radiation unit comprises a radiation cavity, two resonance metal blocks and an L-shaped metal strip, the two resonance metal blocks are symmetrically arranged in the radiation cavity, the radiation cavity is made of metal, the electric field distribution in each radiation cavity is the same, and each radiation cavity is provided with a coupling seam;
four radiation holes are formed above each radiation cavity, the L-shaped metal strips are positioned in the radiation holes, and the L-shaped metal strips positioned in the adjacent quadrant radiation units in the clockwise direction are symmetrically arranged after being rotated by 90 degrees clockwise.
The invention adopts a feed network of metal waveguide one-to-four to feed radiation cavities in four quadrant radiation units, electric fields in the four resonant cavities are consistent, radiation holes are formed in the upper parts of the four radiation cavities, L-shaped metal strips are positioned in the radiation holes, and the L-shaped metal strips in the adjacent quadrant radiation units in the clockwise direction are symmetrically arranged after being rotated by 90 degrees clockwise, namely, each quadrant has four basic radiation antenna units, and the phase difference of 90 degrees exists between the phase of the basic radiation antenna units in the four quadrants and the phase of the basic radiation antenna units in the previous quadrant through each rotation, so that the circularly polarized antenna is realized. The circular polarization function of the antenna is realized by rotating the L-shaped metal strip, the structure of a conventional circular polarizer is removed, and the section height of the antenna is greatly reduced.
Furthermore, the one-to-four metal feed network comprises a one-to-four metal feed waveguide and a metal probe, a correction waveguide is arranged below the one-to-four metal feed waveguide, the top of the metal probe is in contact with the one-to-four metal feed waveguide, the bottom of the metal probe is in contact with an external cavity of the antenna, a correction coupling hole is formed in the correction waveguide, and the correction waveguide and the one-to-four metal feed waveguide are the same in size.
Further, the metal probe adopts bias feeding.
Further, the slots of the metal probes are standing wave matching modules.
Furthermore, the top of the metal probe is in an expansion lotus head structure.
Further, the size of the radiation hole is 0.5 λ × 0.5 λ, λ being a wavelength of the center frequency.
Further, the thickness of the L-shaped metal strip is 2mm, and the two arm lengths of the L-shaped metal strip are 1/3 lambda and 3/10 lambda respectively.
Further, the antenna is of a square structure and has the size of 3.3 lambda multiplied by 3.3 lambda.
In addition, the invention also provides a circularly polarized metal cavity antenna array, which comprises at least two circularly polarized metal cavity antennas, wherein the adjacent side walls of the adjacent circularly polarized metal cavity antennas are common metal walls.
In addition, the invention also provides a preparation method of the circularly polarized metal cavity antenna, which is used for preparing the circularly polarized metal cavity antenna, and the method comprises the following steps:
determining the cross-sectional dimension of the one-to-four metal feed network based on the frequency range, the space range limited by the structure and the requirement of main mode transmission under the lowest frequency;
determining the size of a standing wave matching module in the one-to-four metal feed network based on the requirements of equal power division and standing wave;
determining the size of the coupling slot based on the resonant mode of the cavity, and determining the size of the L-shaped metal strip according to the axial ratio of the antenna;
and preparing the circularly polarized metal cavity antenna based on the cross section size of the one-to-four metal feed network, the size of the standing wave matching module, the size of the coupling gap and the size of the L-shaped metal strip.
The invention has the advantages that:
(1) The invention adopts a feed network of metal waveguide one-to-four to feed radiation cavities in four quadrant radiation units, electric fields in the four resonant cavities are consistent, radiation holes are formed in the upper parts of the four radiation cavities, L-shaped metal strips are positioned in the radiation holes, and the L-shaped metal strips in the adjacent quadrant radiation units in the clockwise direction are symmetrically arranged after being rotated by 90 degrees clockwise, namely, each quadrant has four basic radiation antenna units, and the phase difference of 90 degrees exists between the phase of the basic radiation antenna units in the four quadrants and the phase of the basic radiation antenna units in the previous quadrant through each rotation, so that the circularly polarized antenna is realized. The circular polarization function of the antenna is realized by rotating the L-shaped metal strip, the structure of a conventional circular polarizer is removed, and the section height of the antenna is greatly reduced.
(2) The waveguide antenna is made of metal, so that the heat conduction performance is good, and compared with a microstrip patch antenna, the waveguide antenna is beneficial to the thermal control design in special engineering application; the whole antenna cavity structure is made of metal, and hidden dangers such as deformation and interlayer separation caused by different expansion coefficients of various materials are eliminated.
(3) The circularly polarized metal cavity antenna is simple in structure, the processing difficulty of the waveguide antenna is reduced, and the production cost is reduced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic perspective view of a circular polarized metal cavity antenna according to a first embodiment of the present invention;
FIG. 2 is a schematic cross-sectional perspective view of FIG. 1 according to the present invention;
FIG. 3 is a cross-sectional block diagram of the invention in the orientation corresponding to FIG. 1;
FIG. 4 is a view of the invention in elevation cross section corresponding to FIG. 1;
FIG. 5 is a top view block diagram of the present invention corresponding to FIG. 1;
fig. 6 is a top view of a 1 × 8 linear array of circularly polarized metal cavity antennas in a second embodiment of the present invention;
FIG. 7 is a top view of an 8 × 8 array of circularly polarized metal cavity antennas according to a second embodiment of the present invention;
fig. 8 is a schematic flow chart of a method for manufacturing a circularly polarized metal cavity antenna according to a third embodiment of the present invention.
In the figure:
10-one-to-four metal feed network; 11-a-four metal feed waveguide; 12-a metal probe; 13-a correction waveguide; 20-quadrant radiating element; 21-a radiation cavity; 22-a resonant metal block; 23-L-shaped metal strips; 24-a radiation aperture;
121-slot; 131-correct coupling hole; 211-coupling slot.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 5, a first embodiment of the present invention provides a circular polarization metal cavity antenna, including a one-to-four metal feeding network 10 and four quadrant radiation units 20, where the quadrant radiation units 20 include radiation cavities 21, resonant metal blocks 22 and L-shaped metal strips 23, the two resonant metal blocks 22 are symmetrically arranged in the radiation cavities 21, the radiation cavities 21 are made of metal, electric fields in the radiation cavities 21 are distributed the same, and coupling slits 211 are formed in the radiation cavities 21;
four radiation holes 24 are formed above each radiation cavity 21, the L-shaped metal strips 23 are positioned in the radiation holes 24, and the L-shaped metal strips 23 positioned in the adjacent quadrant radiation units 20 in the clockwise direction are symmetrically arranged after being rotated 90 degrees clockwise.
The radiation cavity 21 is a resonant cavity, and the electric field distribution in the four resonant cavities is the same by adjusting the structure of the feed network; the two resonant metal blocks 22 are placed on the side wall of the resonant cavity and located on two sides of the coupling slit 211 in the length direction, the resonant metal blocks 22 are used for adjusting the working mode in the resonant cavity, the coupling slit 211 is a straight slit, and the one-to-four metal feed network 10 feeds the resonant cavity above through four offset straight slits; the radiation hole 24 is a square hole to realize effective radiation of electromagnetic waves.
Specifically, the quadrant radiation unit 20 is made of metal, and the structure thereof is integrally formed.
In this embodiment, a four-in-one feeding network of metal waveguides is used to feed radiation cavities in four quadrant radiation units, electric fields in four resonant cavities are identical, radiation holes are formed in the upper portions of the four radiation cavities, L-shaped metal strips are located in the radiation holes, and the L-shaped metal strips located in adjacent quadrant radiation units in the clockwise direction are symmetrically arranged after being rotated 90 degrees clockwise, that is, each quadrant has four basic radiation antenna units, and each rotation causes a phase difference of 90 degrees between the phase of the basic radiation antenna unit in the four quadrants and the phase of the basic radiation antenna unit in the previous quadrant, so as to implement a circularly polarized antenna. The circular polarization function of the antenna is realized by rotating the L-shaped metal strip, the structure of a conventional circular polarizer is removed, and the section height of the antenna is greatly reduced.
Moreover, the waveguide antenna is made of metal, so that the heat conduction performance is good, and compared with a microstrip patch antenna, the microstrip patch antenna is beneficial to the thermal control design in special engineering application; the whole antenna cavity structure is made of metal, various problems caused by different expansion coefficients among various materials are eliminated, the power capacity of the metal is large, and the channel power can be increased.
In an embodiment, the one-to-four metal feeding network 10 includes a one-to-four metal feeding waveguide 11 and a metal probe 12, a calibration waveguide 13 is disposed below the one-to-four metal feeding waveguide 11, a top of the metal probe 11 contacts the one-to-four metal feeding waveguide 11, a bottom of the metal probe 11 contacts an external cavity of the antenna, a calibration coupling hole 131 is formed in the calibration waveguide 13, and the calibration waveguide 13 and the one-to-four metal feeding waveguide 11 have the same size.
It should be noted that, the size of the correction coupling hole is determined by the coupling amount, which is generally about-30 dB, and the larger the hole is, the larger the coupling amount is; the size of the correction waveguide is consistent with that of the transmission waveguide, and the correction waveguide and the transmission waveguide can be conveniently processed.
Specifically, the feed network is composed of left and right transverse waveguides and a middle longitudinal waveguide, and comprises a four-in-one metal feed waveguide, the four-in-one metal feed waveguide is fed by a metal probe to form the feed network, and the feed network feeds the four radiation cavities through straight slits.
Specifically, a correction waveguide 13 having the same size as that of the one-to-four metal feed waveguide 11 is provided below the feed network for correction, a correction coupling hole 131 is formed in the correction waveguide 13, and energy coupling is performed through the correction coupling hole 131.
In one embodiment, the metal probe 12 employs a bias feed.
It should be noted that, in order to ensure that the feeding phases in the four resonant cavities are the same, the feeding probe 12 adopts bias feeding.
In one embodiment, the slots 121 of the metal probes 12 are standing wave matching modules.
In an embodiment, the top of the metal probe 12 is an expanded lotus structure, so as to realize effective feeding to the feeding network.
In one embodiment, the radiating aperture 24 has dimensions of 0.5 λ x 0.5 λ, λ being the wavelength of the center frequency.
In one embodiment, the L-shaped metal strip 23 has a thickness of 2mm, and the two arm lengths of the L-shaped metal strip 23 are 1/3 lambda and 3/10 lambda respectively.
It should be noted that the L-shaped metal strip 23 includes a connecting arm and a cantilever, the connecting arm is connected with the hole wall of the radiation hole 24, one end of the cantilever is connected with the connecting arm, and the cantilever is arranged perpendicular to the connecting arm; the arm length of the connecting arm is 1/3 lambda and the arm length of the cantilever is 3/10 lambda, respectively.
It should be noted that the thickness of the L-shaped metal strip is set to 2mm for the engineering realizability, because the suspended L-shaped metal strip is too thin and is easily deformed. The size of the radiation hole is determined according to the working mode in the cavity and the size of the L-shaped metal strip, so that the phenomenon that if the L-shaped metal strip is in contact with the wall of the cavity on the other side, the circular polarization characteristic is lost is avoided.
In the cavity, the electric field is in rotary distribution, if the connecting arm cuts the horizontal electric field, the cantilever cuts the electric field in the vertical direction, and if the electric fields in the horizontal direction and the vertical direction are completely equal, the axial ratio is 0, and due to structural asymmetry, the electric fields are difficult to be completely equal, preferably 1/3 wavelength and 3/10 wavelength, the formed electric fields are approximately equal, and become a preferred choice in the embodiment, and the size range exceeds half of the amplitude control, but cannot be in contact with the other side of the radiation cavity.
It should be noted that, by verifying that the size of the radiation hole 24 and the length of the two arms of the L-shaped metal strip 23 specifically provided in the present embodiment can ensure the optimal performance of the basic radiation antenna unit.
In one embodiment, the antenna is a square structure with dimensions of 3.3 λ x 3.3 λ.
The circularly polarized metal cavity antenna designed by the embodiment has a simple structure, reduces the processing difficulty of the waveguide antenna, and reduces the production cost; the unit interval is large, the number of active channels can be effectively reduced by increasing the unit size, and the cost is saved.
The circularly polarized metal cavity antenna has the advantages that the circularly polarized metal cavity antenna is compact in aperture size, simple in structure, convenient to form a large planar phased array and low in section height, and the problems that in the prior art, a conventional circularly polarized waveguide antenna is high in section height, a conventional microstrip antenna is complex in structure and difficult to process are solved; easy deformation and interlayer separation; poor heat conduction performance; the self structural strength is low after the antenna array is processed.
In addition, as shown in fig. 6 to 7, a second embodiment of the present invention provides a circular polarized metal cavity antenna array, including at least two circular polarized metal cavity antennas as set forth in the first embodiment, wherein adjacent sidewalls of adjacent circular polarized metal cavity antennas are common metal walls.
Fig. 6 shows a 1 × 8 circularly polarized linear array, the other structures are the same as the circularly polarized metal cavity antenna provided in the first embodiment, and the unit spacing is the same, the linear array is an 8-unit linear array formed by translating the circularly polarized metal cavity antenna in the first embodiment along the x axis.
Fig. 7 shows an array of circularly polarized metal cavity antennas. The 1 × 8 circularly polarized linear array shown in fig. 6 is translated along another orthogonal direction to form an area array, and the adjacent side walls of the adjacent circularly polarized metal cavity antennas are all common walls (metal walls are shared by the adjacent cavities).
Further, the planar array antenna may be connected to a T/R assembly as a sub-array in a phased array antenna. And the scanning plane phased array antenna with different specifications can be manufactured according to actual requirements.
The area array can reduce the number of active channels in a limited way, and the effect of saving cost is achieved.
In addition, as shown in fig. 8, a third embodiment of the present invention further provides a method for manufacturing a circularly polarized metal cavity antenna, which is used to manufacture the circularly polarized metal cavity antenna provided in the first embodiment of the present invention, and the method includes the following steps:
s1, determining the cross section size of the one-to-four metal feed network 10 based on the frequency range, the space range limited by the structure and the requirement of main mode transmission under the lowest frequency.
Specifically, the wavelength is calculated from the operating frequency, and the dimensions of the narrow side a and the wide side b of the metal feed waveguide are determined from the wavelength, on the basis of which a, b are made as small as possible but can propagate.
In the present embodiment, the narrow side a and the wide side b of the metal feed waveguide satisfy the following relationship: 2a > λ > a, λ >2b, λ being the operating frequency.
And S2, determining the size of a standing wave matching module in the one-to-four metal feed network 10 based on the requirements of equal power division and standing wave.
It should be noted that the slots of the metal probes in the one-to-four metal feed network 10 are standing wave matching modules, and the sizes thereof can be adjusted during simulation.
S3, determining the size of the coupling slot 211 based on the resonant mode of the cavity, and determining the size of the L-shaped metal strip 23 according to the axial ratio of the antenna.
It should be noted that, in this embodiment, the axial ratio of the antenna is less than 3, the coupling slot is used as a loop in the transmission structure, and the size of the coupling slot has a large influence on the radiation efficiency and the standing wave at the antenna feed port.
And S4, preparing the circularly polarized metal cavity antenna based on the cross section size of the one-to-four metal feed network 10, the size of the standing wave matching module, the size of the coupling slit 211 and the size of the L-shaped metal strip 23.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The circularly polarized metal cavity antenna is characterized by comprising a one-to-four metal feed network (10) and four quadrant radiation units (20), wherein each quadrant radiation unit (20) comprises a radiation cavity (21), two resonance metal blocks (22) and an L-shaped metal strip (23), the two resonance metal blocks (22) are symmetrically arranged in the radiation cavity (21), the radiation cavity (21) is made of metal, electric fields in the radiation cavities (21) are distributed in the same distribution, and coupling seams (211) are formed in the radiation cavities (21);
four radiation holes (24) are formed above each radiation cavity (21), the L-shaped metal strips (23) are located in the radiation holes (24), and the L-shaped metal strips (23) located in the adjacent quadrant radiation units (20) in the clockwise direction are symmetrically arranged after being rotated by 90 degrees clockwise.
2. The circularly polarized metal cavity antenna according to claim 1, wherein the one-to-four metal feeding network (10) comprises a one-to-four metal feeding waveguide (11) and a metal probe (12), a correction waveguide (13) is arranged below the one-to-four metal feeding waveguide (11), the top of the metal probe (11) is in contact with the one-to-four metal feeding waveguide (11), the bottom of the metal probe is in contact with the external cavity of the antenna, a correction coupling hole (131) is formed in the correction waveguide (13), and the correction waveguide (13) and the one-to-four metal feeding waveguide (11) have the same size.
3. The circularly polarized metal cavity antenna according to claim 2, wherein said metal probe (12) is fed with bias.
4. The circularly polarized metal cavity antenna of claim 2, wherein the slots (121) of the metal probe (12) are standing wave matching modules.
5. The circularly polarized metal cavity antenna according to claim 2, wherein the top of the metal probe (12) is of an expanded lotus structure.
6. The circularly polarized metal cavity antenna of claim 1, wherein said radiating aperture (24) has dimensions of 0.5 λ x 0.5 λ, λ being the wavelength of the center frequency.
7. The circularly polarized metal cavity antenna according to claim 1, wherein the thickness of the L-shaped metal strip (23) is 2mm, and the lengths of the two arms of the L-shaped metal strip (23) are 1/3 λ and 3/10 λ, respectively.
8. The circularly polarized metal cavity antenna of claim 1, wherein said antenna is a square structure having dimensions of 3.3 λ x 3.3 λ.
9. A circularly polarized metal cavity antenna array comprising at least two circularly polarized metal cavity antennas according to any of claims 1 to 8, wherein adjacent sidewalls of adjacent circularly polarized metal cavity antennas are common metal walls.
10. A method of manufacturing a circularly polarized metal cavity antenna, for manufacturing a circularly polarized metal cavity antenna according to any one of claims 1 to 8, the method comprising:
determining the cross-sectional dimension of the one-to-four metal feed network (10) based on the frequency range, the space range limited by the structure and the requirement of main mode transmission under the lowest frequency;
determining the size of a standing wave matching module in the one-to-four metal feed network (10) based on the requirements of equal power division and standing wave;
determining the size of the coupling slot (211) based on the resonant mode of the cavity, and determining the size of the L-shaped metal strip (23) according to the axial ratio of the antenna;
and preparing the circularly polarized metal cavity antenna based on the cross section size of the one-to-four metal feed network (10), the size of the standing wave matching module, the size of the coupling slit (211) and the size of the L-shaped metal strip (23).
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| CN202210998979.0A CN115189121A (en) | 2022-08-19 | 2022-08-19 | Circularly polarized metal cavity antenna, array antenna and preparation method thereof |
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| CN202210998979.0A CN115189121A (en) | 2022-08-19 | 2022-08-19 | Circularly polarized metal cavity antenna, array antenna and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394346A (en) * | 2011-06-29 | 2012-03-28 | 西安空间无线电技术研究所 | Evolution antenna of globe matched beam |
| CN106911003A (en) * | 2017-03-01 | 2017-06-30 | 中国电子科技集团公司第三十八研究所 | A kind of broadband circle polarized radiating guide and its aerial array |
| CN109599657A (en) * | 2018-11-29 | 2019-04-09 | 安徽大学 | It is a kind of based on antenna array and function divide feeding network integrated design towards 5G base-station antenna array and its design method |
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| CN102394346A (en) * | 2011-06-29 | 2012-03-28 | 西安空间无线电技术研究所 | Evolution antenna of globe matched beam |
| CN106911003A (en) * | 2017-03-01 | 2017-06-30 | 中国电子科技集团公司第三十八研究所 | A kind of broadband circle polarized radiating guide and its aerial array |
| CN109599657A (en) * | 2018-11-29 | 2019-04-09 | 安徽大学 | It is a kind of based on antenna array and function divide feeding network integrated design towards 5G base-station antenna array and its design method |
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| 汪伟等: "基于超材料的纯金属滤波天线阵", 《2019年全国微波毫米波会议论文集》, 19 May 2019 (2019-05-19) * |
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