A time-domain (TD) analysis of ellipsoidal reflector antennas is presented to predict the transient scattered fields when it is illuminated by a cosine-tapered and transient-step feed radiation whose phase center is located at the nearby focus. A transient-step function of the feed's radiation is considered because it will produce an impulsive response near the second focus of the reflector as interested in the applications of impulse-radiating antennas. This TD solution is in a closed form and remains valid both near and far from the reflector, and can be used via the convolution theorem to efficiently obtain the early time transient fields generated by the same ellipsoidal reflector antenna when it is illuminated by a realistic finite-energy pulse which emanates as a spherical wave from the focus. Numerical results are presented for the transient fields both near and far from the reflector.Index Terms-Aperture integration, ellipsoidal reflector antennas, near-field focus and impulse-radiating antenna, time domain, transient analysis.

No abstract

No abstract

This paper presents a procedure of numerical code hybridization. It can be effectively used in a fast analysis and synthesis of the field patterns radiated from a phased array antenna. In particular, both low and high frequency methods are employed to simulate simultaneously the strong coupling within an antenna structure and its interactions with electrically large structure existed in its vicinity. Examples are presented to demonstrate the validity of this approach.

No abstract