Design of broadband slot antennas for circular polarization

2007 IEEE Antennas and Propagation Society International Symposium Pub Date : 2007-06-09 DOI:10.1109/APS.2007.4396090

Shao-Chang Lu, J. Row, C. Sim, Shiao-Wen Wu

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引用次数: 2

Abstract

It is well-known that the circular polarization (CP) bandwidth of a microstrip antenna is greatly related to its impedance characteristic. Several broadband antenna structures have been proposed and studied, such as using a thick substrate with low permittivity and a multi-resonator structure. Another method to enhance the impedance bandwidth is using slot antennas instead of the microstrip antennas. In this paper, a new CP design developed from the ring slot antenna is proposed. The antenna structure composed of a wide slot and a parasitic patch is with wideband characteristics. By adjusting the distance between the wide respectively, which are obviously higher than that of a same-size microstrip antenna. Also, the CP designs of wide slot antennas have been investigated to further improve the CP bandwidth. By protruding a T-shaped [3] or an L-shaped strip [4] from the ground plane, the CP bandwidth of the wide slot antenna can reach to 18 %. However, the available designs for the slot antenna with more than 20 % CP bandwidth are relatively few in the open articles. In this paper, a new CP design developed from the ring slot antenna is proposed. The antenna structure composed of a wide slot and a parasitic patch is with wideband characteristics. By adjusting the distance between the wide slot and parasitic patch, the CP bandwidth can be varied between 5 and 45%. Details of the proposed designs and the obtained results are shown and discussed.

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圆极化宽带缝隙天线的设计

众所周知，微带天线的圆极化(CP)带宽与其阻抗特性有很大关系。人们提出并研究了几种宽带天线结构，如采用低介电常数厚衬底和多谐振腔结构。另一种提高阻抗带宽的方法是用槽天线代替微带天线。本文在环形槽天线的基础上，提出了一种新的CP设计方案。该天线结构由宽缝隙和寄生贴片组成，具有宽带特性。通过调整两者之间的距离分别较宽，其明显高于同尺寸微带天线。此外，还研究了宽缝隙天线的CP设计，以进一步提高CP带宽。通过在地平面上突出t形[3]或l形条形[4]，宽缝隙天线的CP带宽可达18%。然而，对于超过20% CP带宽的缝隙天线的设计，在公开的文章中相对较少。本文在环形槽天线的基础上，提出了一种新的CP设计方案。该天线结构由宽缝隙和寄生贴片组成，具有宽带特性。通过调整宽槽与寄生贴片之间的距离，CP带宽可以在5% ~ 45%之间变化。详细介绍了所提出的设计方案和得到的结果，并进行了讨论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2007 IEEE Antennas and Propagation Society International Symposium

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