A Subwavelength Element for Broadband Circularly Polarized Reflectarrays

作者：Zhao, Gang^*; Jiao, Yong-Chang; Zhang, Fan; Zhang, Fu-Shun

来源：IEEE Antennas and Wireless Propagation Letters, 2010, 9: 330-333.

DOI：10.1109/LAWP.2010.2047836

• Broadband
• circular polarization
• reflectarray
• single-layer

A subwavelength element is presented for designing a circularly polarized (CP) reflectarray that converts the linearly polarized incident field of the feed into an outgoing circularly polarized field. To evaluate the performance of the designed element, a parametric study is carried out using Ansoft HFSS. Compared to the conventional near-resonant patch, the subwavelength one can realize a more similar behavior for the phase curves at different frequencies, leading to broader bandwidth. The phase shifts for both linear polarizations can be controlled by varying the x- and y-dimension of the element. Aprime-focus reflectarray with this type of element has been designed and implemented, and a superior bandwidth performance has been verified, compared to a reflectarray with conventional lambda/2 elements. The measured results show that the obtained 1-dB gain and 3-dB axial ratio bandwidths of the reflectarray with subwavelength elements can reach as large as 17% and 11%, respectively.

• 出版日期2010
• 单位西安电子科技大学