A newly developed high-efficiency S-band tracking feed is described. It is a focal-point feed designed primarily for use with parabolic reflectors in the 15 to 25 foot diameter class. A five-element aperture geometry was developed to obtain improved performance in sum and difference pattern efficiency over that normally obtained with four-element, hybrid-comparator feeds. Two major e mprovements were obtained: a. Elimination of the conventional hybrid comparator resulted in the ¿ultimate¿ sum-channel efficiency, hence minimum noise temperature degradation due to feed losses. b. Independent control of the difference-pattern illumination produced ¿near-optimum¿ gainslope performance simultaneously with optimized sum-channel illumination. Design theory for this feed geometry is discussed, and measured impedance and radiation pattern data obtained from the finished feed system are presented.


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    Title :

    The Ultimate S-Band Monopulse Focal-Point Feed


    Contributors:


    Publication date :

    1966-11-01


    Size :

    1897526 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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