Purdue Research Foundation

The Jackson Laboratory

Dohyuk Ha

Pedro P Irazoqui

William Johnson Chappell

Henry Mei

Simon W M John

A wireless power transfer system is disclosed. The system includes a first resonator having a first resonant frequency &#x3c9;, a half power bandwidth &#x394;&#x3c9;, and an unloaded quality factor Qo=&#x3c9;/&#x394;&#x3c9;coupled through a first coupling circuit to a power source, a second resonator having a second resonant frequency &#x3c9;, a half power bandwidth &#x394;&#x3c9;, and an unloaded quality factor Qo=&#x3c9;/&#x394;&#x3c9;coupled through a second coupling circuit to a load, the first resonator disposed a distance away from the second resonator, wherein the distance is smaller than the first and second resonant wavelengths, the first and second coupling circuits are configured so that up to a maximum achievable power transfer efficiency between the first and second resonators can be achieved, wherein Qoand Qocan be less than 100.

Magnetic resonance coupling arrangement

Certain pressure sensor devices are much smaller than prior art devices, yet are at least as sensitive as the prior art devices. A capacitive pressure sensor can include a flexible substrate that permits bending of a pressure sensing region without significantly affecting operation thereof. The pressure sensor can include a flexible membrane in which an electrode is sandwiched between two layers of polymeric material. The sandwiched electrode can be extremely close to a reference electrode so as to provide for highly sensitive capacitance readings, yet the membrane can be restricted from contacting the reference electrode under high pressure conditions.

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Lafayette, IN, United States of America

Dohyuk Ha