Design of C/X dual band and dual circularly polarized shared-aperture microstrip antenna
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摘要: 设计实现了一款C/X双频双圆极化共口径微带天线，在C/X频段均能以双圆极化方式工作，有效提高了天线的口径利用率。采用寄生结构和L型探针耦合馈电拓展了天线的阻抗带宽；以嵌套方式将X波段天线置于C波段天线的间隙处实现了共口径设计；通过对称反相馈电技术实现了良好的交叉极化比。测试结果表明，C波段的阻抗带宽和3 dB轴比带宽分别大于23%和17%；X波段的阻抗带宽和3 dB轴比带宽分别大于28%和18%；测试频点处的交叉极化比均大于25 dB。Abstract: A dual band dual circularly polarized shared-aperture microstrip antenna is designed and fabricated, which can operate in the dual circular polarization mode in the C/X band, and the aperture utilization rate of the antenna is effectively improved. The parasitic structure and the L-shaped probe are applied to improve the impedance bandwidth. The shared aperture design is realized by placing the X-band antenna in the gap of the C-band antenna. The good cross-polarization ratio is realized by the symmetrical inversed phase feeding technique. The measurement results show that the impedance bandwidth and 3 dB axial ratio bandwidth of C-band are greater than 23% and 17%, respectively. The impedance bandwidth and 3 dB axial ratio bandwidth of X-band are greater than 28% and 18% respectively. The cross-polarization ratio at the test frequency points is greater than 25 dB.
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表 1 C/X波段天线单元尺寸
Table 1. Dimensions of C/X band antenna element
(mm) Lr1 Lr2 Lr3 Lp1 Lp2 Lp3 Lb1 Lb2 Lf 6.4 8.6 11 5.9 8.1 10.5 7.1 5.6 8.5 Wr1 Wr2 Wr3 Wp1 Wp2 Wp3 dyc Rc Rv 3.4 2.8 2 2.8 2.6 1.8 15.2 0.6 1 W W1 Ls Ws Lx Wx Rs 1.1 0.36 4 0.4 1.6 10.5 0.2 
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表 2 天线阵列结构的各项参数
Table 2. Dimensions of antenna array
(mm) h1 h2 h3 h4 h5 h6 h7 h8 Ls dc dX 0.5 1.5 0.5 1 2 0.5 2 0.5 100 40 23
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表 3 与其他圆极化天线的比较
Table 3. Comparison with other dual-band dual circularly polarized antennas
antennas bands polarization impedance bandwidth/% 3 dB AR bandwidth/% gain/dBi aperture efficiency/% size/λ0 Ref [8] X/Ku RHCP/LHCP 8.3/18.9 14.2/14.9 17.5/18.3 52.2/31.8 2.25×2.25×0.02 Ref [9] C/X LHCP/RHCP 21.0/21.2 13.2/12.8 14.5/17.5 59.4/55.6 1.83×1.83×0.08 Ref [10] S/C RHCP/LHCP 20.4/12.6 16.6/5.7 1.9/1.3 − 0.30×0.30×0.01 this work C/X LHCP/RHCP;
LHCP/RHCP23.3/25.9;
28.6/28.717.7/19.0;
19.8/18.713.7/13.7;
12.3/12.957.6/57.6;
45.5/52.21.62×1.62×0.14
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