Effects of ground-plane size on planar UWB monopole antenna

Abstract

Planar monopole antennas have found widespread applications in wireless communication systems. Their advantages of compact size, omnidirectional radiation pattern and wide impedance bandwidth make them good candidates for the designs of ultra-wideband (UWB) antennas. This paper investigates the effects of the dimensions of the rectangular ground-plane on the return loss and efficiency of an elliptical planar monopole antenna for UWB applications. Computer simulation and measurement are carried out on a group of nine antennas with different rectangular ground plane sizes. The simulated and measured results on return loss agree well. However, the simulated and measured efficiencies do not agree well in the lower UWB band. The measured efficiency shows that the efficiency is affected more by the width rather than by the length of the ground plane while the length of the ground plane affects the lower cutoff frequency.

Quad‐band planar monopole antenna with bent ground plane for WLAN and WiMAX applications

“…In Refs. , the authors explain the trade‐off between antenna's gain and directivity. The variation and difference in the antenna gains, magnitude of return loss and radiation patterns at resonant frequencies for the configurations (proposed, metal case, and metal sheet) show that when the size of the ground plane (metal case and metal sheet) increases, directivity of the antenna is also increased which makes it likely to increase the gain.…”

Cable Effects on Measuring Small Planar UWB Monopole Antennas

“…Structure of the antennasTo investigate the effects of ground-plane size on measurements of small UWB monopole antennas, a group of nine antennas, Ants 1, 2, …, 9, are used. These antennas have an identical elliptical-shaped radiator printed on one side of the substrate but a ground plane with different sizes on the other side of the substrate[18]. They are designed on the Rogers substrate, RO4350, with a relative dielectric constant of 3.48, a thickness of 0.762 mm and a loss tangent of 0.0037, as shown inFigure 6.…”