Broadband CPW-fed circularly polarized antenna with machine-gun-shaped feeding line and symmetric-aperture

Article type: Research Article

Authors: Xi, Li^{a; *} | Lin, Yang^a | Shang, Jun-Ping^a | Xi, Chen^a | Feng, Xue-Yong^a | Yi, Wang^a

Affiliations: [a] National Key Laboratory of Antennas and Microwave Technology, Xidian University, Xi'an, Shaanxi, China

Correspondence: [*] Corresponding author: Xi Li, National Key Laboratory of Antennas and Microwave Technology, Xidian University, Xi'an 710071, Shaanxi, China. E-mail: xli@xidian.edu.cnm

Abstract: This paper presents a new design for wide slot circularly polarized (CP) antenna (WSCPA). Compared with existing WSCPA, the proposed design possesses much wider return loss S_{11} bandwidths and CP bandwidths. The main features of the antenna structure include a machine-gun-shaped CPW feeding line and a wide symmetric-aperture along the diagonal axis. Wideband return loss and CP radiations have been achieved by properly tuning circular-shaped aperture and feeding line. The measured bandwidths of 10 dB return loss and 3 dB axial ratio (AR) are around 110.2% (2.2–7.6 GHz) and 105.9% (2–6.5 GHz), respectively. Throughout this letter, the improvement process of the AR and S_{11} properties is completely presented and discussed.

Keywords: Broadband, CPW-fed, circularly polarized antenna

DOI: 10.3233/JAE-131658

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 42, no. 2, pp. 215-225, 2013