Purdue Research Foundation

Bae Systems Information and Electronic Systems Integration Inc.

Michael Dimitri Sinanis

Dimitrios Peroulis

Ahmed Mahmoud Mahrous Abdelraheem

Paul D Zemany

Jack Chuang

Mark D Hickle

Eric J Naglich

Mark E Stuenkel

Thomas J Johnson

Curtis M Grens

Souleymane Gnanou

A system is disclosed which includes a chamber, one or more transmitters configured to emit EM radiation, one or more power harvesters, one or more EM stirrer, and a processing system configured to a) receive a measure of dimensional characteristics of the chamber b) control the one or more EM stirrers, c) evaluate statistical properties of the statistical EM environment, d) set a new criterion for acceptable statistical properties of the statistical EM environment, e) measure a lowest usable frequency of the chamber below which the statistical properties are not acceptable according to a predetermined criterion, f) determine an efficiency profile of the one or more power harvesters versus frequency, g) select an operating frequency that maximizes efficiencies of the one or more power harvesters, h) measure a collective efficiency of the chamber, and i) return to step d if the measured collective efficiency is below a predetermined efficiency threshold.

Method and system of uniform wireless power distribution within a chamber

A method of uniform RF-heating within a chamber is disclosed, which includes cyclically varying electromagnetic properties of a chamber according to a plurality of configuration, transmitting an alternating RF signal about a first frequency range between a first frequency and a second frequency from a transmitter into the chamber, measuring electromagnetic power at a random receiver location in the chamber for each of the plurality of configurations and at a predetermined resolution of frequency thereby generating a statistical distribution vs. frequency, applying a statistical test to the generated statistical distribution based on a predetermined statistical function, determining a standard deviation of the average received power as a function of frequency, choosing a third frequency range associated with a standard deviation lower than a second threshold, and choosing an operational frequency in the third frequency range which provides maximum heating depending on the material being heated.

RF-heating in industrial metallic chambers

A method of focused wireless power transmission is disclosed which includes generating a map for electromagnetic fingerprints at N locations within an environment of interest, including a transmitter and plurality of receivers each located at one of the N locations, transmitting pre-matched signals based on the electromagnetic fingerprints in a predetermined order for a first location of the N location, measuring response at each of the N locations, measuring spatial correlations between all other locations and the first location, and evaluating electromagnetic power focus at each of the N locations by comparing the measured spatial correlations.

Wireless power transmission based on pre-matched filtering

A method of uniform wireless power distribution within a chamber is disclosed which includes measuring dimensional characteristics of a chamber, having a transmitter and a plurality of power harvesters, creating a statistical electromagnetic environment, evaluating statistical properties of the statistical electromagnetic environment, setting a new criterion for acceptable statistical properties of the statistical electromagnetic environment, measuring a lowest usable frequency of the chamber below which the statistical properties of the statistical electromagnetic environment are not acceptable according to a predetermined criterion, determining an efficiency profile of the plurality of power harvesters versus frequency at frequencies higher than the lowest usable frequency, selecting an operating frequency that maximizes efficiencies of the plurality of power harvesters, measuring a collective efficiency of the chamber, and returning to setting a new criterion if the measured collective efficiency is below a predetermined efficiency threshold.

An evanescent-mode cavity filter with an improved MEMS tuner design is disclosed. The MEMS tuner design allows for the independent control of individual poles in a multi-pole filter, which increases the adaptability of the filter in a crowded RF environment. The filter is further designed to minimize tuning voltages and hysteresis effects. A closed loop control system provides highly responsive tuning of the filter. The closed loop control allows for accurate and stable tuning that compensates for temperature and vibrational effects, while the tuner design enables fast tuning and significantly increases the resolution of the feedback measurement by eliminating charge buildup in the tuner substrate.

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McLean, VA, United States of America

Michael Dimitri Sinanis