Abstract

A dual band coaxial feedhorn was investigated for use in a deep-dish paraboloidal reflector antenna. The radiation patterns were measured and compared with computed results at the mid frequencies, 3.95 GHz and 11.95 GHz, of two different bands. The test results confirm that the dual band coaxial feedhorn with a coaxial cavity has the broad beam radiation patterns which are required for deep-dish paraboloidal reflector antennas. The ripples existing in the upper-band radiation pattern are caused by the coaxial waveguide which surrounds the inner circular waveguide. >

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