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A Broadband Circularly Polarized Antenna with Equal Ripple Axial Ratio Response

A circularly polarized antenna and equiripple technology, which is applied in the microwave field, can solve the problems that the amplitude ratio and phase difference are not satisfied, and the axial ratio response of broadband equiripple cannot be achieved, and achieve the effect of expanding the axial ratio bandwidth

Active Publication Date: 2020-08-07
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the amplitude ratio and phase difference do not satisfy a certain corresponding relationship in the broadband, so that the axial ratio response of broadband equal ripple cannot be realized

Method used

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  • A Broadband Circularly Polarized Antenna with Equal Ripple Axial Ratio Response
  • A Broadband Circularly Polarized Antenna with Equal Ripple Axial Ratio Response
  • A Broadband Circularly Polarized Antenna with Equal Ripple Axial Ratio Response

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Effect test

Embodiment 1

[0035] Please refer to image 3 and Figure 4 , a kind of circularly polarized antenna 1 with equal corrugation axial ratio response of the present invention comprises two layers of dielectric boards 11 and 12 that are close to each other, a metal floor 13, a square patch antenna 111, half-wavelength resonators 121, 122, and 123 , 50Ω transmission lines 124 and 125 , 100Ω chip resistor 126 , quarter-wavelength impedance transformation lines 127 and 128 , and input feeder line 129 . The metal floor 13 is the underlying metal layer of the dielectric board 12 . The square patch antenna 111 is on the upper surface of the dielectric board 11 , and the microstrip feed network is on the upper surface of the dielectric board 12 . The feeding network includes half-wavelength open-circuit resonators 121, 122 and 123, wherein the resonators 122 and 123 couple energy through edges, and the resonators 121 and 122 are respectively placed along the centerlines of the two directions of the ...

Embodiment 2

[0039] Please refer to Figure 9 and Figure 10 , a circularly polarized antenna 2 with equi-ripple axis ratio response of the present invention, comprising two layers of dielectric plates 21 and 22 that are close to each other, a metal floor 23, a square patch antenna 210, and a quarter-wavelength short-circuit resonator 221, a half-wavelength open-circuit resonator 220, 100Ω microstrip lines 223 and 224, and a 50Ω input feeder line 225. The metal floor 23 is the underlying metal layer of the dielectric board 22 . The square patch antenna 210 is on the upper surface of the dielectric board 21 , and the microstrip feed network is on the upper surface of the dielectric board 22 . The microstrip line 221 and the shorting via 222 together form a shorted quarter-wavelength resonator, and are connected to the microstrip line 223 with a characteristic impedance of about 100Ω. The short-circuited quarter-wavelength resonator and the open-circuited half-wavelength resonator 220 are...

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Abstract

The invention discloses a broadband circular polarized antenna with equal-ripple axial ratio responses, and belongs to the microwave technical field; the circular polarized antenna axial ratio frequency responses have a plurality of minimum values in the work frequency band, and the axial ratio amplitude value in the frequency band is lower than certain set value, thus forming the broadband equal-ripple axial ratio responses. The circular polarized antenna axial ratio band width can be effectively expanded; a feed network is designed, thus enabling the amplitude ratio and phase difference of excitation signals of two orthogonal modes of the antenna to respectively form corrugated changes around 1 and + / -90 degrees, and forming the broadband equal-ripple axial ratio responses.

Description

technical field [0001] The invention relates to the field of microwave technology, in particular to a broadband circularly polarized antenna with equi-ripple axial ratio response. Background technique [0002] With the development of radio frequency and microwave technology, circularly polarized antennas have been widely used. The circularly polarized antenna reduces the azimuth sensitivity of the receiving antenna and the transmitting antenna, and the circularly polarized wave has strong anti-interference ability and anti-rain and fog ability. [0003] The excitation methods of circularly polarized patch antennas can be roughly divided into two types, single-feed point and double-feed point. The single-feed point circular polarization antenna mainly realizes circular polarization by introducing perturbations such as cut angles and slots on the antenna to separate two orthogonal radiation modes with a 90° phase difference. However, this type of circularly polarized antenna...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/38H01Q1/48H01Q1/50
CPCH01Q1/38H01Q1/48H01Q1/50
Inventor 祝雷吴琼森张晓汤一铭李波
Owner NANJING UNIV OF POSTS & TELECOMM
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