Compact ultra-wideband antennas with single band-notched characteristic using simple ground stubs

Abstract

In this article, a compact planar monopole antenna for ultra-wideband applications with band-notched characteristic is presented. The antenna with a small size of 30 mm × 39.3 mm operates from 2.57 to over 12 GHz with return loss larger than 10 dB and the radiation patterns similar to that of dipole antennas. A pair of ground stubs locating along the edge of the ground plane is used to create the band-notch characteristic. The band notch covers the wireless area network band from 5.15 to 5.825 GHz. The center-notch frequency and notch bandwidth can be adjusted using the dimensions of the ground stubs. Prototype of the proposed antenna is designed, fabricated, and studied. The band-notched characteristics, return loss, radiation patterns, peak gains, and efficiencies of the antenna are studied using both computer simulation and measurements. © 2011 Wiley Periodicals, Inc.