Dual Wide Band Circularly Polarized Microstrip Patch Antenna with Offset Feed

• DOI: 10.1007/s11277-020-07363-6
• Publication Date: 2020-04-18T17:02:15Z
• Authors: Neha Y. Joshi; Paritosh D. Peshwe; Ashwin G. Kothari
• Keywords: Axial ratio; Turnstile antenna; Return loss; Patch antenna; Multi-band device

A compact, dual band circularly polarized antenna has been proposed and investigated. It has been designed with single feed and has simple structure. The antenna has a unique complimentary ground structure along with offset feeding which promotes the circular polarization (CP). These peculiarities in the structure also help in widening the axial ratio bandwidth (380 MHz and 1.08 GHz respectively at the two resonances) and improving the quality of CP. It has large return loss as well as axial ratio bandwidth. The antenna operates in C band and has resonances at 4.55 GHz and 7.58 GHz respectively. This makes the antenna suitable for all the emerging wireless communication applications where circular polarization is required. As a proof-of-concept, the prototype of the antenna has been fabricated and the measured results are in very good agreement with the simulated ones.