A Ka-band array-fed near-field Cassegrain antenna envisioned for NASA's Solar Probe Mission is the basis of the present spacecraft telecommunications system, which is designed for operation at X-band up/downlink and Ka-band downlink. The hexagonal array employed, which is located at the Cassegrain point of the 0.75-m reflector, encompasses 37 active elements; each of these contains 1/4-W HEMT amplifiers. Relative to a TWTA-based system, this active array feed reduces mass, increases dc power efficiency, enhanced reliability, and reduces volume requirements.


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    Title :

    Proposed Ka-band array-fed near field Cassegrain system for NASA's Polar Probe Mission


    Contributors:
    Kellogg, K. (author) / Kapoor, V. (author) / Vacchione, J. (author) / Rascoe, D. (author) / Komarek, T. (author) / Randolph, J. (author) / Crist, R. (author)

    Conference:

    AIAA International Communication Satellite Systems Conference and Exhibit ; 1992 ; Washington, DC, United States


    Publication date :

    1992-01-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




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