Antenna Study for the National Oceanic Satellite System (NOSS)

Three concepts capable of meeting most of the goals in the designing of the antenna are described. One concept utilizes a subreflector, as in an offset cassegrain. The subreflector is a quasi-optical diplexer so that one or two single frequency horns of desired illumination angle radiate through while four or more frequencies from an SMMR type horn are reflected from it. With this design, performance objectives are obtained. The third concept utilizes a separate feed and one meter reflector for the higher frequencies. An SMMR type multifrequency horn is used as a prime feed for the main reflector. This offers better beam efficiency and options for additional frequencies