COMPACT MICROSTRIP OMNIDIRECTIONAL ULTRAWIDEBAND ANTENNA WITH DUAL BROADBAND NESTED U-SHAPED SLOTS AND FLAT FREQUENCY RESPONSE

摘要

In this article, we present a compact ultrawideband antenna with dual broadband-notched characteristics centered at 3.4 and 55 GHz The proposed antenna consists of a rectangular patch with a modified ground plane structure and 50 Omega microstrip-fed line By etching two opposite U-shaped slots in the radiating patch, the notched hands of 3.375-3..945 GHz for WiMAX and 5.425-6.150 GHz for WLAN and HYPERLAN/2 were achieved. The antenna also offers a flat frequency response so minimizing the formation of spurs and precursors that ensures optimal time domain performance for ultrawideband radio applications The return loss was measured to better than -10 dB over the entire band from 3.1 to 10.6 GHz The antenna gain was larger than 2 dBi all over the frequencies with a flatness of 2 5 dB and an omnidirectional radiation pattern in the H-plane (C) 2015 Wiley Periodicals, Inc.