Title :
Optical probe for input-impedance measurement of in vivo power-receiving microstructure
Author :
Yeh, Alexander J. ; Ho, John S. ; Poon, Ada S. Y.
Author_Institution :
Dept. of Electr. Eng., Stanford Univ., Stanford, CA, USA
Abstract :
An optical method is proposed to measure the input impedance of a microstructure in vivo operating at microwave frequencies. It makes use of the non-linearity of an AC-DC conversion circuit and encodes the received power level to the pulse rate of an LED which can be accurately measured by a photodiode outside the tissue medium. An accurate measurement of the characteristics of the power-receiving structures in a wireless powering system greatly enhance the power transfer efficiency.
Keywords :
electric impedance measurement; microwave measurement; AC DC conversion circuit; in vivo power receiving microstructure; input impedance measurement; microwave frequencies; optical probe; photodiode; power transfer efficiency; tissue medium; wireless powering system; Antenna measurements; Frequency measurement; Integrated circuit modeling; Optical pulses; Optical variables measurement; Probes; Resonant frequency;
Conference_Titel :
Antennas and Propagation Society International Symposium (APSURSI), 2014 IEEE
Conference_Location :
Memphis, TN
Print_ISBN :
978-1-4799-3538-3
DOI :
10.1109/APS.2014.6905030
