A directional circularly polarized crossed‐dipole antenna with bandwidth enhancement. Issue 9 (11th August 2018)

• Record Type: Journal Article
• Authors: Guo, Zifang; Zhao, Zhiqin; Yang, Yaohui; Ding, Xiaoxiang
• Is Part Of: Microwave and optical technology letters. Volume 60:Issue 9(2018:Sep.)
• Page Start: 2161
• Page End: 2167
• Publication Date: 2018-08-11
• Subjects: broadband -- circularly polarized -- crossed dipoles -- parasitic loading; Microwaves -- Periodicals; Optics -- Periodicals; 621
• DOI: 10.1002/mop.31324
• Languages: English
• ISSNs: 0895-2477

Abstract

Abstract: A broadband circularly polarized antenna based on the crossed‐dipole structure is designed. The antenna consists of a pair of dual‐side printed crossed dipoles, a loop phase delay line, and a parasitic patch. By modifying the configuration of the dipoles and introducing a parasitic patch, a wide axial ratio (AR) bandwidth is obtained. A defected ground plane is designed, which has a significant improvement in extending the 3‐dB AR bandwidth and enhances the gain. The proposed prototype is manufactured and measured for validation. Measured results show that the antenna achieves both −10 dB impedance bandwidth and 3‐dB AR bandwidth of 68.6% (2.3–4.7 GHz). Moreover, the average gain of the antenna is about 8 dBi within the operating band, with a floating less than 2 dB.