REAM SHAPING TECHNIQUE APPLICATION FOR WAVEGUIDES

Abstract

Because of their inherently directive besims, microwave antennas have found wide applications for communication pur- poses. But in some special circumstances, for exssple, very broad primary patterns, where a wider angular coverage is essential, the antenna designer must resort either to scann- ing of the antenna or to suitable beam-design techniques for generating the desired directional characteristics. In many cases of bean shaping, it is simply necessary to meet require* ments of bow direction, bean width and side lobes, but in others a precise duplication of a particular beam shape is essential. Consequently, the complex antenna excitation distribution at the aperture has to be generated accurately. In this dissertation, an attempt has been made to broaden the H-plan. boom width of an open ended rectangular wave guide by a relatively simple method of boom shaping with sire obstacles placed systematically across the aperture and subsequent tap- ering of the waveguide corners