Mohseni Armaki

PhD Thesis Defense Session

Abstract:
This thesis describes the design and realization of a multi-mode tracking feed antenna system, for a circularly polarized wave, which can generate sum and difference patterns suitable for monopulse tracking in remote sensing earth stations. It uses TE11 and TE21 modes, in a smooth circular waveguide, to obtain the sum and difference patterns. The higher order mode, TE21 generated within the feed is separated from the fundamental mode, TE11 by using a mode coupler. Circular polarization is converted to linear polarization by pin polarizer septum. The design of the multimode corrugated horn, optimum TE21 mode coupler and polarizer are described in some details. The size and shape of the sidewall slots of mode coupler is optimized to provide an efficient coupling. The use of compact mode coupler with a conical corrugated horn makes the design particularly simple and inexpensive. The prototyped horn designed here operates in the frequency range of 7.2-8.8GHz. Sum and delta patterns and polarizer axial ratio are presented. The close agreement between measured and simulated data validates the present design

: Date of Defense
Monday, 26 Sep. 2011, at 15:30
Room , Department of Electrical Engineering