Design of Windmill Shaped Ultra-Wideband Antenna for Mobile Application

Abstract

A compact, wideband, windmill shape ultra-wideband antenna is designed for mobile
communication and a comparison is carried out among different substrate materials to
investigate the most suitable substrate for the proposed antenna. UWB antennas are suitable
for mobile communication due to its large bandwidth. The proposed antenna occupies a
compact size of 34 mm x 30 mm. The design of the proposed antenna and the simulations are
carried out in HFSS (High Frequency Structural Simulator). The antenna is designed on a
polyethylene substrate with a dielectric constant (εr) of 2.25 and a thickness of 1.6 mm. This
provides high return loss and gain when compared with other analyzed substrates. The
antenna operates at a frequency band of 4 GHz to 10 GHz which is the recommended
frequency range of UWB band by FCC. The maximum gain of the proposed antenna is 5.16
dB at 6 GHz and the directivity of the antenna is 5.27 dB with efficiency of 97.8 %. This
antenna is suitable for UWB communication, with its broadband characteristics it can be
utilized short-range communication.