In this letter, a geometrically simple, reflector-backed single-point-fed circularly polarized (CP) antenna with unidirectional radiation pattern is presented. The structure comprises a simple coplanar waveguide (CPW) feeding circuit with an open slot etched on one side of the coplanar ground. The enhanced CP bandwidth is obtained by combining the loop mode, the slot mode, and the asymmetrical configuration of the coplanar ground planes along the feed line. All parameters are optimized at the full-wave level of description for the best impedance and axial ratio (AR) bandwidth. The antenna footprint is only 0.35 λo×0.39 λo at the lowest CP operating frequency of 3.1 GHz. The measurement results indicate 82% impedance bandwidth (from 3 GHz to 7.2 GHz), and 80% AR bandwidth (from 3.1 GHz to 7.2 GHz). A unidirectional right-hand circular polarization (RHCP) radiation pattern in the +z-direction is also achieved by adding a reflector. The peak realized gain of the antenna is 6.7 dBic, and the peak radiation efficiency is 98%.
Authors
- Ubaid Ullah,
- prof. dr inż. Sławomir Kozieł link open in new tab ,
- Ismail Mabrouk
Additional information
- DOI
- Digital Object Identifier link open in new tab 10.1109/lawp.2019.2945543
- Category
- Publikacja w czasopiśmie
- Type
- artykuły w czasopismach
- Language
- angielski
- Publication year
- 2019
