Robert received his BSEE from the University of Washington in 2009. He has previously held industrial positions with Kimberly-Clark working at a tissue factory in Everett, WA and at a Huggies diapers plant in Ogden, UT.
Strong I/O Coupled High-Q Micromechanical Filters [BPN682]
This project applies some of the Q-factor improvement techniques currently used on capacitive
resonators to realize better piezoelectric ones, thus enabling new narrowband filter and oscillator
applications. Capacitive-piezo transduction provides a clear path for demonstrating low motional
impedance (10-1000 Ohm) and high-Q (Q~10,000) AlN resonators at VHF and UHF frequencies, which
notably possess much stronger coupling than capacitive resonators. Greatly improved Q-factors,
afforded through capacitive-piezoelectric transduction, enable such AlN resonators to achieve higher
kt^2-Q figures of merit than traditional AlN resonator counterparts having contacting electrodes.
While resonator optimization is a necessary step that this project takes, the long range goal of
this effort is to mechanically couple many such resonators to realize high-order, self-switchable,
channel-select filters made from aluminum nitride with fractional bandwidths of 0.1-0.3%, insertion
losses of less than 2-dB, stop-band rejection exceeding 50-dB, and handling capability for high out-
of-band and in-band power. Such work is nearing completion.