共口径双圆极化微带天线

doi:10.12305/j.issn.1001-506X.2021.07.11

Abstract

Abstract:

In order to solve the problem of narrow axial ratio bandwidth of circularly polarized antenna, a four-fed dual circular polarization microstrip patch antenna which is fed by two Wilkinson power dividers and two ring bridges is designed. The phase shift direction of the output signal is opposite when the feeding network is fed by different ports, so it can radiate left-handed or right-handed circular polarized waves. The dual circular polarization feed network has the characteristics of simple structure and reliable performance. Four triangular patches with opposite vertices are used to load T-shaped branches, and the back-fed structure of radiation patch realizes the compact structure of the antenna. The prototype antenna is fabricated and tested in the frequency band of 2.4~2.48 GHz, the measured center frequency point S₁₁ is less than -15 dB, the left-handed circular polarization in port P_in1 is less than 2 dB, and the right-handed circular polarization in port P_in2 is less than 1.5 dB. Compared with the same type of similar size antenna, it has a wider axial ratio bandwidth. The radiation pattern is simulated and tested and the results show that the four-fed structure improves the symmetry and the axial ratio of radiation pattern.

Key words: dual circular polarization, microstrip antenna, co-aperture, four-fed with 90°phase difference

CLC Number:

TN82

Chunxia CHENG, Liyan LUO. Co-aperture dual circularly polarized microstrip antenna[J]. Systems Engineering and Electronics, 2021, 43(7): 1813-1818.

Figures/Tables 9

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Table 1

References 30

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方法	中心频率/GHz	S₂₁最小值/dB	3 dB轴比带宽	尺寸	增益/dBic
文献[15]	2.2	―	30.0%	―×0.114 λ₀	8
文献[25]	10	-18	4.0%	0.9 λ₀×1.4 λ₀×0.02 λ₀	5
文献[28]	2.575	-20	1.3%	0.7 λ₀×0.7 λ₀×0.03 λ₀	5.77
本文方法	2.45	-35	8.1%	0.7 λ₀×0.7 λ₀×0.02 λ₀	-1

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Co-aperture dual circularly polarized microstrip antenna

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