Sean Korhummel

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The second annual Student Wireless Energy Harvesting (WEH) Design Competition was held during the 2013 IEEE Microwave Theory and Techniques Society (MTT_S) International Microwave Symposium (IMS2013) in Seattle, Washington, United States. This year, the competition parameters were modified from those of last year [1], and a new figure of merit (FoM) was(More)
This paper discusses harvesting of low-power density incident plane waves for electronic devices in environments where it is difficult or impossible to change batteries and where the exact locations of the energy sources are not known. As the incident power densities vary over time and space, distributed arrays of antennas with optimized power-management(More)
This paper introduces a new capacitive wireless power transfer approach with the potential to significantly enhance power transfer density in large air-gap applications. This enhancement is achieved through the use of multiple phase-shifted capacitive plates that reduce fringing fields in areas where field levels must be limited for safety reasons. The(More)
This paper presents a method for wireless powering of multiple electronic devices placed in an over-moded 2.2-GHz shielded microwave cavity using watt-level high-efficiency sources. Two transmitters based on a 77% efficient pHEMT PA to feed the cavity incoherently via strategically placed microstrip probes. The field patterns inside the cavity result from(More)
This paper discusses a shielded over-moded conductive cavity for wirelessly powering multiple electronic devices simultaneously. The demonstrated cavity is designed for 10-GHz powering with a subwatt transmitter. A study of methods to increase power density uniformity within the cavity is presented, including mechanical stirring, conductive and absorptive(More)
The efficiency of a wireless powering system is maximized when the power transmitter power-added efficiency (PAE), power receiver conversion efficiency (&#x03B7;<sub>C</sub>) and wireless coupling efficiency (&#x03B7;<sub>W</sub>) are maximized. This paper focuses on a general approach to the design of an efficient transmitter and receiver of a high-power(More)
Summary form only given. This paper presents a 900MHz flexible folded dipole rectenna with 2.7 dB RF-to-DC conversion loss and mass of only 2 grams. It employs a Schottky diode, a capacitor, and printed coplanar circuit elements. Rectification efficiency is improved by harmonic terminations resulting in class-F waveform shaping achieving an estimated(More)
A 900 MHz low-cost flexible omni-directional rectenna with a mass of 2.1 grams is demonstrated. A rectenna as demonstrated here employs only a Schottky diode, a capacitor, and a printed coplanar circuit which presents class-F harmonic terminations to the diode, resulting in approximately 48.6% efficiency at a low 8 &#x03BC;W/cm2 incident power density. The(More)
A wireless system-on-chip with integrated antenna, power harvesting and biosensors is presented that is small enough, 200&#x00B5;m &#x00D7; 200&#x00B5;m &#x00D7; 100&#x00B5;m, to allow painless injection. Small device size is enabled by: a 13&#x00B5;m &#x00D7; 20&#x00B5;m 1nA current reference; optical clock recovery; low voltage inverting dc-dc to enable(More)
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