Measured Gain Improvement Characteristics of a Space Diversity Antenna System |
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Authors: | Deerkoski L.F. |
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Affiliation: | Adv. Development Div. NASA Goddard Space Flight Center Greenbelt, Md.; |
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Abstract: | A two-element adaptively phased array withelement gains of 18 dB was assembled andevaluated at 136 MHz. The gain improvementof the system over that of a single element wasmeasured while tracking ATS-C. The measuredgain improvement fell within 0.5 dB ofthe theoretical maximum 90 percent of thetime, corresponding to a normalized improvementof 2.5 dB for the two-element array. Athorough analysis of the AGC weighting processused in the system was made with particularemphasis placed on the effects of gainand noise figure variations between arraychannels. |
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