Small Printed Ultra-Wideband Antenna with Subband Rejection Capability

Abstract

A small printed antenna is described with subband rejection for ultrawideband (UWB) applications [1]. Two notches are incorporated in the radiating structure of the antenna to act as a bandstop filter to reject the undesired subband within the whole bandwidth [2]. The designed antenna features a compact size of 26×25 mm 2 , and satisfies the VSWR requirement of less than 2.0 in the frequency band from 3 GHz to more than 12 GHz excluding any undesired subband such as 4.65-5.65 GHz. Good monopole-like radiation patterns and antenna gains have also been obtained.