nitter operating at circular-aperture ante ith à two- degree beamwidth is desired. The aperture efficiency is 65%. What should the antenna diameter be to achieve this beamwidth? What is the corresponding gain? (b) Find the diameter of an antenna that will provide a 150-mile diameter spot at the equa- tor within the 3 dB beamwidth if the platform on which the antenna is mounted is a geostationary-orbit satellite. Assume the operating frequency and efficiency of part (a). What is the gain of the antenna? (Geostationary altitude is 35,784 km above the earth's equator.)

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