Combined triple band circularly polarised and compact UWB monopole antenna

Abstract

A new design of a compact ultra-wide band (UWB) monopole antenna with triple-band, triple-sense circular polarisation (CP) is presented here. It is composed of a compact quad-circular monopole, a fractal parasitic ring resonator, a triangular ring resonator, rectangular ring resonator, and modified `T' and `I' shaped slots on the ground plane along with a rectangular stub with `E'-shaped slot on the right side of the monopole. The proposed antenna radiates left-hand circularly polarised (LHCP) wave at lower and mid-frequency bands, while right-hand circularly polarised (RHCP) wave at upper frequency band. The results show that the antenna covers an ultra-wide bandwidth from 3.1 to 11 GHz (112%). Moreover, the proposed antenna achieves good CP characteristics at Citizens Broadband Radio Services in USA (3.55-3.72 GHz), artificial magnetic conductors and WLAN upper frequency spectrum (4.81-5.61 GHz), VSAT services & Satellite Communication and Ground Surveillance RADAR (9.29-10.95 GHz), respectively. Novelty of this article lies in designing a compact printed UWB monopole antenna with combined triple band CP characteristics controllable by adjusting the antenna design parameters. The simulated and measured results of the antenna have been compared and seen to be in reasonable agreement.