Non-foster active impedance circuit for electrically small antennas
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United States of America Patent
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May 1, 2018
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Jul 7, 2015
filing date -
Jun 12, 2012
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Abstract
An antenna comprising: a driven element; an input feed coupled to the driven element wherein the input feed is configured to be connected to a receiver; a non-Foster circuit having a negative impedance, wherein the non-Foster circuit is configured to actively load the antenna at a location on the antenna other than at the input feed; and wherein the antenna fits within an imaginary sphere having a radius a, and wherein the product ka is less than 0.5, where k is a wave number.
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