Research on Broadband Antenna Systems.
Final rept. 1 Sep 72-31 Jan 74,
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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A computer-aided technique was developed for the design of matching networks that are adaptive, in the sense that the network can be controlled by a change in one or more voltages. These control voltages are automatically varied with a change in the frequency of operation, over wide bandwidths, in such a manner that the match between a complex impedance load and source can be improved over that obtainable with a fixed passive network. A small diameter, slow-wave, conical helix antenna was designed that provides essentially axially directed radiation. The matching technique has been applied to the design of an adaptive network for this antenna with excellent results over a bandwidth from 150 to 223 MHz.
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