Mesoband Pulse Radiator Design With Circuit Model Analysis of Spark Gap Switch

In this paper, a mesoband pulse radiator fed by a spark gap switch is designed, and its radiation characteristics are analyzed. Initially, a modified equivalent circuit model of spark gap switch is proposed to enable detailed explanation and fast design. Then, dual resonant characteristic due to the higher order mode of a mesoband pulse radiator is newly analyzed by changing the dipole length and radius. According to the analyzed results, the variation of the dipole length affects not only the radiating power, but also the operating frequency and bandwidth. The measured 3-dB bandwidth of the designed pulse radiator is about 57% (λ = 1.15 m), meeting the need for a mesoband condition. The radiated electric field at 4 m from the radiator has a peak of 7.19 kV/m.