Design, Simulation and Experimental Analysis of Wideband Circularly Polarized Capacitive Fed Microstrip Antenna

Abstract

Wideband Circularly polarized antenna receive much attention in the wireless communication applications such as Global positioning system (GPS) and Personal communication system (PCS). In this paper, a microstrip square patch, truncated in opposite corners, suspended above the ground plane is proposed. The geometry incorporates the capacitive feed strip which is fed by a coaxial probe. The proposed structure is designed, simulated and fabricated to cover the entire frequency of GPS, i.e., L 1 (1.575 GHz), L 2 (1.227 GHz), and L 5 (1.176 GHz), covering from (1.15 GHz-1.6 GHz). The parameters such as return loss, VSWR, impedance, radiation efficiency axial ratio and radiation pattern are used for analyzing the performance of the antenna. Both simulated and experimental results are presented and they exhibit broadband characteristics, covering the desired frequency bands.

Study of broadband circularly polarised microstrip antennas

“…The following example demonstrates the design of a wideband circularly polarized antenna. It is extension of the work done already by the same authors at centre frequency 1.375 GHz in [56]. The major limitation of the antenna is that the size of the antenna is larger due to operating frequency covering all the GPS frequencies 1.176 GHz, 1.227 GHz and 1.575 GHz.…”

“…2 shows the geometry of wideband circularly polarized antenna. The design equations are given already in [56]. The dimensions of the antenna are optimized using ANSOFT HFSS and the performance of the antenna is analyzed.…”