Alexander R. Katko

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We present the design and experimental implementation of a power harvesting metamaterial. A maximum of 36.8% of the incident power from a 900 MHz signal is experimentally rectified by an array of metamaterial unit cells. We demonstrate that the maximum harvested power occurs for a resistive load close to 70 X in both simulation and experiment. The power(More)
We present an experimental demonstration of phase conjugation using nonlinear metamaterial elements. Active split-ring resonators loaded with varactor diodes are demonstrated theoretically to act as phase-conjugating or time-reversing discrete elements when parametrically pumped and illuminated with appropriate frequencies. The metamaterial elements were(More)
Articles you may be interested in Tunable microwave impedance matching to a high impedance source using a Josephson metamaterial Appl. Ultra-broadband electromagnetically induced transparency using tunable self-asymmetric planar metamaterials Induced strain mechanism of current collapse in AlGaN/GaN heterostructure field-effect transistors Appl. Depletion(More)
—We present the design and experimental implementation of an RF limiter metamaterial using a sheet of nonlinear metamaterials. We demonstrate that complementary electric in-ductive-capacitive resonators loaded with nonlinear p-in diodes can act as RF limiter unit cells. We design and fabricate limiter metamaterials and compare them to traditional circuit(More)
Commercialized, low C-SWAP (Cost, Size, Weight and Power), software defined communications apertures will substantially increase network capacity in future 5G wireless networks. We advocate using high gain, electronically steerable antennas for small cell radio access networks, backhaul and millimeter wave applications. The steerable beam functionality can(More)
—Metamaterials have been previously loaded with diodes and other types of passive circuit elements. Transistors offer an alternative to these established loading elements to expand the possible capabilities of metamaterials. With embedded transistors, additional degrees of freedom are achieved and lay out the architecture for more complex electromagnetic(More)
Metamaterials have gained extensive attention in recent years due to their ability to exhibit material properties otherwise difficult or impossible to obtain using natural materials. Nonlinear and active metamaterials in particular exhibit great promise for exploring new effects and applications, from tunability to mixing. However, nonlinear and active(More)
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