The purpose of this thesis is to design antennas and filters which can be used in UWB wireless communication system. In this thesis, planar antennas and filters are investigated and verified for UWB. We design antenna & filter for both 3~5 GHz and 3~10 GHz UWB application. Measurement results are presented for antenna only, filter only and combined antenna and filter. The measured gain and insertion loss agreed well with simulation.