USA As Represented by Secretary of the Navy

Albert B Ryu

Jia-Chi Samuel Chieh

John D Rockway

Justin A Church

Diana Arceo

Lu Xu

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.

Non-foster active impedance circuit for electrically small antennas

The present invention is directed to a transmitter system. The system is made up of a reference clock, a differential oscillator and an edge combining power amplifier (ECPA). The clock feeds a low frequency reference signal into the differential oscillator to produce at least two low frequency outputs with opposite phases. Each low frequency output is made up of a number of low frequency subsignals equal to the number of oscillator stages. Each low frequency output is fed into a branch in the ECPA having a number of sub-branches equal to the number of oscillator stages. A processor uses an edge combining algorithm to combine these subsignals into a high frequency signal.

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San Diego, CA, United States of America

Albert B Ryu