Abstract-A CPW-fed compact elliptical monopole UWB antenna is introduced with potentially reconfigurable band rejection characteristic at the band used for wireless LAN applications. The antenna is fabricated on thin (100 jum) liquid crystal polymer (LCP) and the band notch is caused by the presence of a two resonating inverted L-shaped stubs that are connected to the elliptical radiator. The frequency notch can be potentially reconfigurable with the use of switches that would connect and disconnect the stubs on the elliptical radiator. Surface currents' distribution and a simple transmission line model are used to interpret the effect of the two stubs on the radiation mechanism. The presence of the stubs does not alter the radiation patterns behavior which is almost identical to the behavior of a design without any stubs with the exemption of the gain in the frequency notch band, which is maintained negative.

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