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CN-122000693-A - Broadband circularly polarized dielectric resonator antenna with double-sided beam broadening

CN122000693ACN 122000693 ACN122000693 ACN 122000693ACN-122000693-A

Abstract

The invention discloses a broadband circularly polarized dielectric resonator antenna with double-sided beam broadening, which is sequentially provided with a first dielectric block, a first metal layer, a second dielectric block, a metal stratum, a dielectric substrate and a second metal layer from top to bottom, wherein the first dielectric block is rectangular, the second dielectric block is in a central symmetry cross shape, the first metal layer comprises four rectangular metal patches in central symmetry and a pair of 45-degree oblique symmetry metal strips, the metal stratum is etched with a fork-shaped feed slot, and the second metal layer is in a straight-line microstrip feed structure. The signals are coupled to the fork-shaped feed slot through the microstrip feed structure, the laminated dielectric block is excited to generate orthogonal modes to form right-hand circular polarization, the rectangular metal patch realizes beam broadening, and the metal strip suppresses the left-hand circular polarization to broaden the axial ratio bandwidth. The invention has wide bandwidth, can widen double-sided wave beams, is convenient for array scanning, and is suitable for the fields of satellite communication and the like.

Inventors

  • FAN MENGYAN
  • XU KAI
  • Xu Ranhao
  • SHI JIN
  • SHAO CHUAN
  • ZHANG WEI
  • ZHANG LINGYAN

Assignees

  • 南通大学

Dates

Publication Date
20260508
Application Date
20260317

Claims (10)

  1. 1. The broadband circularly polarized dielectric resonator antenna with the double-sided beam broadening is characterized by comprising a first dielectric block (1), a first metal layer (2), a second dielectric block (3), a metal stratum (4), a dielectric substrate (5) and a second metal layer (6); The first medium block (1) is of a rectangular structure, the second medium block (3) is of a cross-shaped structure with central symmetry, and the first medium block (1) is arranged at the central position of the upper surface of the second medium block (3); The first metal layer (2) comprises four rectangular metal patches (201) which are arranged in a central symmetry manner and a pair of metal strips (202) which are arranged in an oblique symmetry manner along an angle of 45 degrees, the four rectangular metal patches (201) are arranged at the central positions of the tail ends of the upper surfaces of all the medium arms of the second medium block (3) in a one-to-one correspondence manner, and one side edge of each rectangular metal patch (201) at the upper left corner is connected with one metal strip (202) respectively; A fork-shaped feed slot (401) is etched in the center of the metal stratum (4), and the second metal layer (6) is of a straight-line microstrip feed structure; The signal is coupled to a fork-shaped feed slot (401) through the in-line microstrip feed structure, and the first dielectric block (1) and the second dielectric block (3) are excited through the coupling of the fork-shaped feed slot (401) to form right-hand circularly polarized radiation with double-sided beam broadening.
  2. 2. The dual-sided beam-broadening broadband circularly polarized dielectric resonator antenna of claim 1 wherein the projection of the first dielectric block (1) falls completely within the center region of the second dielectric block (3) and each side of the first dielectric block (1) is perpendicular to the dielectric arm direction of the second dielectric block (3), respectively.
  3. 3. The broadband circularly polarized dielectric resonator antenna of the double-sided beam broadening according to claim 1, wherein a pair of the metal strips (202) are respectively arranged on the upper surfaces of two adjacent dielectric arms of the second dielectric block (3) and are positioned at one side corresponding to the length direction of the rectangular metal patch (201), one side of the metal strip (202) is in seamless connection with the side of the rectangular metal patch (201), the other side is flush with the side of the dielectric arm, and a gap is arranged between the end of the metal strip (202) and the end of the dielectric arm.
  4. 4. The dual-sided beam-broadening broadband circularly polarized dielectric resonator antenna of claim 1 wherein the first dielectric block (1) has a length of 0.12 λ 0 ~0.13λ 0 , a width of 0.24 λ 0 ~0.25λ 0 , and a height of 0.279 λ 0 ~0.281λ 0 , based on a free space wavelength λ 0 corresponding to the center frequency.
  5. 5. The dual-sided beam-broadening broadband circularly polarized dielectric resonator antenna of claim 4 wherein each dielectric arm of said second dielectric block (3) has an arm length of 0.23 λ 0 ~0.24λ 0 , a width of 0.279 λ 0 ~0.281λ 0 , and a height of 0.061 λ 0 ~0.063λ 0 .
  6. 6. The dual-sided beam-stretching broadband circularly polarized dielectric resonator antenna of claim 5, wherein the rectangular metallic patch (201) has a length of 0.21 λ 0 ~0.22λ 0 and a width of 0.15 λ 0 ~0.16λ 0 , and the metallic strip (202) has a length of 0.21 λ 0 ~0.22λ 0 and a width of 0.046λ 0 ~0.047λ 0 .
  7. 7. The dual-sided beam-broadening broadband circularly polarized dielectric resonator antenna of claim 4 wherein the fork-shaped feed slot (401) is formed by two rectangular slots of equal width diagonally intersecting at 45 ° with a width of 0.030 λ 0 ~0.032λ 0 , wherein the longer rectangular slot length is between 0.23 λ 0 ~0.24λ 0 and the shorter rectangular slot length is between 0.093 λ 0 ~0.094λ 0 .
  8. 8. The dual-sided beam-broadening broadband circularly polarized dielectric resonator antenna as defined in claim 4 wherein said in-line microstrip feed structure is formed by two rectangular microstrip lines connected, the in-line microstrip feed structure extending from a midpoint of one side of the metallic ground plane (4) to a center point of the metallic ground plane (4) and crossing said fork feed slot (401).
  9. 9. The dual-sided beam-stretching broadband circularly polarized dielectric resonator antenna of claim 8, wherein the in-line microstrip feed structure has a longer rectangular microstrip line (601) with a length of 0.63 λ 0 ~0.64λ 0 and a width of 0.034λ 0 ~0.036λ 0 , and a shorter rectangular microstrip line (602) with a length of 0.139 λ 0 ~0.141λ 0 and a width of 0.015 λ 0 ~0.016λ 0 .
  10. 10. A dual-sided beam-expanding wideband circularly polarized dielectric resonator antenna according to any of claims 1-9, characterized in that the stacked dielectric blocks operate in mutually orthogonal relationship Mold and method for manufacturing the same The rectangular metal patch (201) excites TM 01 mode at the tail end of a medium arm to widen the beam width, and the metal strip (202) suppresses right-hand circular polarization and widens the axial ratio bandwidth through interference on an electric field.

Description

Broadband circularly polarized dielectric resonator antenna with double-sided beam broadening Technical Field The invention belongs to the field of microwave communication, and particularly relates to a circularly polarized dielectric resonator antenna. Background The circularly polarized dielectric resonator antenna has the advantages of high radiation efficiency, low loss, high design freedom and the like of the dielectric, circularly polarized multipath interference resistance, polarization mismatch avoidance and the like, and has wide application in the fields of satellite communication and the like. With the increasing demands of wireless systems for bandwidth and beam scanning, the bandwidth and beam width of the circularly polarized dielectric resonator antenna also need to be increased, so as to realize a circularly polarized antenna with wide bandwidth beam broadening. However, conventional circularly polarized dielectric resonator antennas often have complex designs and high processing costs, and most of them fail to achieve beam broadening effects, and cannot meet new requirements of wireless systems. Therefore, the broadband circularly polarized dielectric resonator antenna with the double-sided beam broadening has good research significance and engineering value. The main design methods of the current wide-beam circularly polarized dielectric resonator antenna are mainly three. The first method adopts cross slot excitation to realize circular polarization radiation in an orthogonal mode of a rectangular column dielectric resonator with a perforated substrate, and realizes double-sided beam broadening through a peripheral metal ring, but has the problems of complex structure and narrow bandwidth. The second type adopts the combination of a ground plane with a special shape and a feed structure to obtain wide-beam circularly polarized radiation, but the problems of complex structure and narrow bandwidth still exist, and meanwhile, the array scanning is difficult to carry out. And thirdly, the medium blocks with special shapes are excited by adopting a plurality of bending grooves to realize the radiation effect of wide beam circular polarization, and then four separated metal sheets are used for controlling the radiation performance, but the processing difficulty is high and the array scanning is not facilitated. Therefore, it is necessary to provide a wideband circularly polarized dielectric resonator antenna with two-sided beam broadening, and the bandwidth and the array requirements can be simultaneously met. Disclosure of Invention Aiming at the prior art, the invention provides a broadband circularly polarized dielectric resonator antenna with double-sided beam broadening, which can realize the wide working bandwidth, double-sided beam broadening and is convenient for array scanning. The technical scheme is that the broadband circularly polarized dielectric resonator antenna with the double-sided beam broadening comprises a first dielectric block, a first metal layer, a second dielectric block, a metal stratum, a dielectric substrate and a second metal layer; the first medium block is of a rectangular structure, the second medium block is of a cross structure with central symmetry, and the first medium block is arranged at the central position of the upper surface of the second medium block; The first metal layer comprises four rectangular metal patches which are arranged in a central symmetry manner and a pair of metal strips which are arranged in an oblique symmetry manner along an angle of 45 degrees, the four rectangular metal patches are arranged at the central position of the tail end of the upper surface of each medium arm of the second medium block in a one-to-one correspondence manner, and one side edge of each rectangular metal patch at the upper left corner is respectively connected with one metal strip; a Y-shaped feed slot is etched in the center of the metal stratum, and the second metal layer is a straight microstrip feed structure; the signal is coupled to the fork-shaped feed slot through the in-line microstrip feed structure, and the first dielectric block and the second dielectric block are excited through the coupling of the fork-shaped feed slot, so that right-handed circularly polarized radiation with double-sided beam broadening is formed. Further, the projection of the first medium block completely falls into the central area of the second medium block, and each side surface of the first medium block is perpendicular to the medium arm direction of the second medium block. Further, a pair of metal strips are respectively arranged on the upper surfaces of two adjacent medium arms of the second medium block and are positioned on one side corresponding to the length direction of the rectangular metal patch, one side edge of each metal strip is in seamless connection with the side edge of the rectangular metal patch, the other side edge of each metal strip is flush with th