Ultrawideband Circularly Polarized Spiral Antenna Using Integrated Balun With Application to Time-Domain Target Detection
Ultrawideband Circularly Polarized Spiral Antenna Using Integrated Balun With Application to Time-Domain Target Detection
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DOI：
10.1109/tap.2009.2021883
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发表时间：
2009-07-01
影响因子：
5.7
通讯作者：
Chen, Shiou-Li
中科院分区：
文献类型：
--
作者：
Mao, Shau-Gang;Yeh, Jen-Chun;Chen, Shiou-Li
介绍了一种宽带圆极化等角螺旋天线的设计。与传统的采用同轴线或垂直连接馈电结构的螺旋天线不同，该天线将一个锥形微带巴伦完全集成到一个螺旋臂中，从而实现了完全平面化。测试结果表明，该天线在3.75~18.6 GHz范围内回波损耗优于10d B，在3~14.5 GHz范围内轴比小于3d B，辐射为双向反向极化，天线峰值增益为3.5~7dBic。通过暂态响应研究了采用超宽带(UWB)CP天线的发射/接收系统的时域特性。脉冲失真很小，并通过测量的天线性能得到验证，该天线具有高信号保真度(>；=0.89)和低的群时延变化(
The design of a wideband circularly polarized (CP) equiangular spiral antenna is described. Contrary to the conventional spiral antenna using the coaxial line or the vertically connected feeding structure, a tapered microstrip balun is fully integrated into one spiral arm of the proposed antenna and hence this construction can be realized completely planar. The measured results show that the return loss is better than 10 dB from 3.75 to 18.6 GHz, the axial ratio is below 3 dB from 3 to 14.5 GHz, the radiation is bidirectional with opposite polarization, and the antenna peak gain is 3.5 to 7 dBic. The time-domain characteristic of the transmitting/receiving system using the proposed ultrawideband (UWB) CP antennas is investigated by transient response. The pulse distortion is insignificant and is verified by the measured antenna performance with high signal fidelity (>= 0.89) and low variation of group delay (