Transient radiation from the open end of circular waveguide

The transient radiation from the open end of a circular waveguide is considered by analytical and direct numerical methods. The radiation of short pulse from the aperture is considered by calculation of special time form of field by means of modal basis method. The method permits to solve the problem of pulse evolution for positive and negative time with the use of Laplace transform by construction of operator of propagation. The method of correction of pulse distortion on aperture is suggested on the base of properties of operator of propagation in waveguide. The control of pulse form of field on aperture is demonstrated.