Influence of conductor tube in circular PMA for UWB range

The study of printed monopole antennas (PMA) with truncated ground plane has application in various types of technologies. This kind of ground plane, promotes an omnidirectional radiation pattern with broadband response and allows the antenna to suffer influence from nearby conductive material. This article presents the simulated and measured results of influences from a rectangular aluminum tube on a circular PMA that meets the UWB technology requirements. The results obtained indicate that the tube at a wavelength distance of 1/8? reduce the bandwidth by 50% in X-band (8 ~ 12 GHz), half power bandwidth HPBW is approximately 90° and gain of 6.92 dBi.