Research on Pulse Radiation of Planar Equiangular Spiral Antennas

Planar Equiangular Spiral Antennas (PESA) are modeled by the RGWedge element models in this study. The surface current of the antenna is solved by the Method of Moment (MoM), and input impedance, transfer function and radiated pulse waveform of it are presented. The research indicated that, in the interesting frequency band, its input impedance is in good agreement with the theoretical value of that of Self-Compensated antennas (as defined by Babinet´ principle). Its transfer function has a flat amplitude response and a linear phase response over very wide band. PESA can be used as a ultra-wide band (UWB) pulse antenna. Radiating electric field waveform is similar to that of second derivative Gaussian pulse.