Affiliations: [a] Science and Technology on Antenna and Microwave
Laboratory, Xidian University, Xi'an, Shaanxi, China | [b] Xi'an Electronic Engineering Research Institute,
Xi'an, Shaanxi, China
Correspondence:
[*]
Corresponding author: Xi Li, Science and Technology on Antenna
and Microwave Laboratory, Xidian University, Xi'an, Shaanxi 710071, China.
E-mail: [email protected]
Abstract: A novel design of low profile circularly polarized antenna with
performances of high gain and broad bandwidths is presented in this paper.
Through the method of connecting the radiating patch to the ground plane by the
metal wall, the peak gain of the antenna can be achieved as high as 11.8 dBi.
Furthermore, In order to improve the axial ratio (AR) and impedance bandwidths,
broadband 90° phase-shifter is introduced as feeding network. Annular-ring
structure acts as radiating patch instead of circular patch can further improve
the AR bandwidths. The measured results show that the antenna possess an
impedance (VSWR ⩽ 2) bandwidths of 23.3% ranging from 1.87 GHz to 2.36 GHz,
and right-handed circular polarized (RHCP) axial ratio (AR ⩽ 3dB)
bandwidths of 24.3% ranging from 1.84 GHz to 2.35 GHz relative to the center
frequency of 2.1 GHz, which agree well with simulated results.
Keywords: Circularly polarized antenna, high gain, wideband
