A Dual-Layer T-Shaped Element for Broadband Circularly Polarized Reflectarray With Linearly Polarized Feed

Author

Ren, Li-Shi ; Jiao, Yong-Chang ; Li, Fan ; Zhao, Jin-Juan ; Zhao, Gang

Author_Institution

Nat. Lab. of Antennas & Microwave Technol., Xidian Univ., Xi´´an, China

Volume

10

fYear

2011

fDate

7/3/1905 12:00:00 AM

Firstpage

407

Lastpage

410

Abstract

A novel dual-layer T-shaped 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. Compared to the microstrip rectangle patch, the T-shaped one can show an almost linear behavior and a much larger phase variation range that exceeds 500° with a low slope. Then, a prime-focus 81-element reflectarray with this type of element has been designed and implemented. The measured results show that the obtained 1-dB gain bandwidth and 3-dB axial-ratio bandwidth of the reflectarray with the T-shaped elements can reach as large as 20% and 28%, respectively.

Keywords

antenna feeds; broadband antennas; microstrip antenna arrays; planar antenna arrays; polarisation; reflectarray antennas; broadband circularly polarized reflectarray; dual-layer T-shaped element; linearly polarized feed; linearly polarized incident field; microstrip rectangle patch; prime-focus 81-element reflectarray; Bandwidth; Broadband antennas; Broadband communication; Feeds; Gain; Microstrip; Broadband; T-shaped; circular polarization; reflectarray;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2011.2148090

Filename

5756634