A Novel Heptagonal Slot Antenna for Ultra Wideband Wireless Communication Applications

Abstract

In this paper, a novel design of a heptagonal slot antenna is proposed to be used for ultra-wideband (UWB) applications. This antenna has a heptagonal slot with suitable dimensions on the lower side of a dielectric substrate which represents the ground plane, and asymmetrical slant cut ends microstrip line on the upper side of the substrate. In order to cover the entire bandwidth that was specified for UWB applications, a bevel rectangular with a rectangular notch cut tuning stub is used to enhance the coupling between the heptagonal slot and the taper microstrip feed line. Several kinds of techniques are used to improve the design of the proposed antenna such as; adjusting the gap between the tuning stub and the lower edge of the heptagonal slot, adjusting the feed position point of the tuning stub, adjusting the end cut angle of the microstrip line and bevel angle of tuning stub. The radiation characteristics of the proposed antenna such as radiation pattern, gain, and impedance bandwidth is investigated and found to be accepted over the whole operating bandwidth. The proposed antenna also shows good time domain characteristics and has a linear phase over this band giving less distortion of the received signal.