A circularly polarized open loop antenna with application to an array fed by a microstrip comb line
A circularly polarized open loop antenna with application to an array fed by a microstrip comb line
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DOI：
10.1109/aps.2008.4618932
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发表时间：
2008-07
期刊：
影响因子：
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通讯作者：
K. Hirose;T. Sukegawa;Y. Uchikawa;H. Nakano
中科院分区：
文献类型：
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作者：
K. Hirose;T. Sukegawa;Y. Uchikawa;H. Nakano
在地平面存在的情况下，研究了一种具有间隙的环状天线。利用矩量法对天线的CP辐射结构进行了优化。结果表明，随着环距地平面高度的减小，最优间隙宽度趋于零。对于导线半径增大的天线，进一步降低天线高度是可能的。在此基础上，设计了一种以微带梳状线为馈电网络的开环阵列天线。结果表明，由8个开环单元组成的阵列天线可以发射轴向比为0.1dB的CP波。对于3分贝的轴比标准，带宽为4%，其中增益在15分贝时几乎是恒定的。
A loop antenna having a gap has been investigated in the presence of a ground plane. The antenna configuration is optimized for the CP radiation, using the method of moments. It is found that, as the loop height above the ground plane is reduced, the optimized gap width approaches zero. Further antenna height reduction is found to be possible for an antenna whose wire radius is increased. On the basis of these results, we design an open-loop array antenna using a microstrip comb line as the feed network. It is demonstrated that an array antenna composed of eight open loop elements can radiate a CP wave with an axial ratio of 0.1 dB. The bandwidth for a 3-dB axial-ratio criterion is 4%, where the gain is almost constant at 15 dBi.