Abstract
In this article, a low cost, simple, and compact printed microstrip-fed U-shape monopole ultra-wideband antenna with dual band-notched characteristics is proposed and investigated. By introducing a spiral shaped ‚/4 open stub in the microstrip feed line and a pair of L-shaped slots on the rectangular ground patch, dual band notched characteristics can be obtained respectively. The proposed antenna is successfully simulated, designed, fabricated and measured. The measured results show that the proposed antenna with dimensions of 24mm(Wsub) £ 34mm(Lsub) £ 1:6mm(H) has a large bandwidth over the frequency band from 2.75GHz to 10.6GHz with VSWR less than 2, except 3.27{4.26GHz and 5.01{5.99GHz frequency bands. The proposed antenna exhibits nearly omnidirectional radiation pattern, stable gain, and small group delay variation over the desired frequency bands.
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