A Systematic Methodology for the Time-Domain Ringing Reduction in UWB Band-Notched Antennas

Various ultrawideband (UWB) band-notched antennas are developed to avoid interference between UWB and other nearby narrow frequency bands that falls within the UWB spectrum. However, all band-notched UWB antennas developed generate ringing in the time domain, and a great amount of distortion is present in transmitted (or received) UWB pulses. The distortion level is dependent on band-notching strength and bandwidth, and it highly degrades the performance of the UWB system that is based on short pulses. This letter investigates time-domain ringing effect in UWB band-notched antennas and proposes a solution for its reduction. The proposed technique is verified through simulation and validated using measurements. The proposed technique will have key importance in impulse UWB radars.