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首页> 外文期刊>Microwave and optical technology letters >A compact wideband four-arm spiral antenna with dual modes
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A compact wideband four-arm spiral antenna with dual modes

机译：具有双模式的紧凑型宽带四臂螺旋天线

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摘要

A compact wideband four-arm circularly polarized (CP) spiral antenna with both sum mode (1) and difference mode (2) is presented. The antenna is composed of a modified four-arm equiangular spiral, a four-arm z-directional helix, a ring-shaped absorber, and a ground plane. By using the modified equiangular spiral and the z-directional helix, the impedance matching of mode 1 and mode 2 is improved, and the cross-polarization discrimination of mode 2 is also improved in the low frequency band. The z-directional helix is also applied to achieve a compact size of the antenna and an enhanced AR bandwidth of mode 2. A prototype of the four-arm spiral antenna is fabricated and measured with a beamformer operating at 0.5 to 2 GHz. It is shown that both sum and difference radiation patterns are generated in the whole frequency band of 0.5 to 2 GHz. The overall size is 0.486 lambda(0.5 GHz) x 0.097 lambda(0.5 GHz) (diameter x height, lambda(0.5 GHz) is the free-space wavelength at 0.5 GHz).
机译：提出了一种既有和模（1）又有差模（2）的紧凑型宽带四臂圆极化（CP）螺旋天线。该天线由改进的四臂等角螺旋线、四臂z向螺旋线、环形吸收体和地平面组成。通过使用改进的等角螺旋线和z方向螺旋线，改善了模式1和模式2的阻抗匹配，并改善了模式2在低频段的交叉极化鉴别。z方向螺旋线也用于实现天线的紧凑尺寸和模式2的增强AR带宽。制作了一个四臂螺旋天线的原型，并用0.5至2 GHz的波束形成器进行了测量。结果表明，在0.5～2ghz的整个频带内都能产生和差辐射。总尺寸为0.486λ（0.5 GHz）x 0.097λ（0.5 GHz）（直径x高度，λ（0.5 GHz）是0.5 GHz下的自由空间波长）。

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