With the development of pulse power technology in recent years, sub-nanosecondand picosecond pulses have been realized, which made ultra-wideband (UWB)technology a wide range of applicantions in defense military and national economicfields. UWB antenna technology gets involved in the radtion of short pulses with verywide bandwidth as traditional antennas are not suited for it. To radiate short pulses,UWB antennas have to get flat frequency response, high withstand voltage and gooddirectivity with low side l...