Ultrawideband Printed Elliptical Monopole Antennas

TLDR

The study varied the ellipticity ratio of printed elliptical monopole antennas to investigate its effect on bandwidth. A parametric study and design curve for feed line length were developed, and measurements confirm that an elliptical monopole with an ellipticity ratio of 1.1 achieves an ultrawide impedance bandwidth ratio of 12.4:1—better than the 10.2:1 circular monopole—while exhibiting minimal ringing and distortion.

Abstract

Parametric study of ultrawideband printed elliptical monopole antennas have been presented. Design curve for the length of the feed transmission line for various lower band edge frequencies has been generated. Variation of bandwidth with ellipticity ratio of these configurations has also been studied. Experiments have been performed to measure bandwidth and radiation patterns of these configurations, which tally well with simulated results. The elliptical configuration with ellipticity ratio of 1.1 gives ultrawide impedance bandwidth ratio of 12.4:1 as compared to 10.2:1 of the circular monopole antenna. This antenna introduces minimum ringing and distortion/dispersion of the pulse in time domain