US 12,320,769 B2
Systems and methods for battery-less wirelessly powered dielectric sensors
Aydin BabakhanI, Los Angeles, CA (US); and Yuxiang Sun, Los Angeles, CA (US)
Assigned to The Regents of the University of California, Oakland, CA (US)
Appl. No. 17/287,432
Filed by The Regents of the University of California, Oakland, CA (US)
PCT Filed Nov. 4, 2019, PCT No. PCT/US2019/059657
§ 371(c)(1), (2) Date Apr. 21, 2021,
PCT Pub. No. WO2020/106440, PCT Pub. Date May 28, 2020.
Claims priority of provisional application 62/820,770, filed on Mar. 19, 2019.
Claims priority of provisional application 62/769,166, filed on Nov. 19, 2018.
Prior Publication US 2021/0356417 A1, Nov. 18, 2021
Int. Cl. G01N 27/22 (2006.01); A61B 5/00 (2006.01); H02J 50/00 (2016.01); H02J 50/20 (2016.01); H02J 50/80 (2016.01)
CPC G01N 27/228 (2013.01) [A61B 5/0031 (2013.01); G01N 27/221 (2013.01); H02J 50/001 (2020.01); H02J 50/20 (2016.02); H02J 50/80 (2016.02); A61B 2560/0219 (2013.01); H02J 2310/23 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A wirelessly powered dielectric sensor, comprising:
an RF-power receiving antenna that receives electromagnetic power;
a power management unit (PMU) comprising a first capacitor to rectify and store the electromagnetic power; and
a dielectric constant sensing sensor comprising an oscillator comprising a second capacitor and an inductor;
wherein the PMU monitors harvested energy and operates the dielectric sensing sensor;
wherein the dielectric sensing sensor senses a dielectric constant of a material that is in close proximity by capacitance change of the second capacitor, and which sensed capacitance change of the second capacitor produces a shift in the oscillation frequency of the oscillator.