Abstract
For impulse-radiating-antenna applications, an improved quasi-analytic method of offset reflectors' direct impulse response analysis is presented in this article. The offset reflector is illuminated by a time-domain Gaussian beam. The proposed method can eliminate errors caused by numerical differentiation because the numerical differentiation of step response is avoided. Time-domain physical optic approximation is utilized to investigate the direct impulse response. With the appropriate coordinate transform, the direct impulse response integral problem can be reduced to one-dimensional angular integral, which is independent of the reflector's size. Adaptive interpolation is adopted when the impulse response changes rapidly.
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