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Wireless, RF & Smart Dust
     
 

BPN682: Strong I/O Coupled High-Q Micromechanical Filters

Project ID BPN682
Website
Start Date Tue 2012-Aug-14 08:49:07
Last Updated Fri 2014-Aug-22 15:40:14
Abstract 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.
Status Continuing
Funding Source DARPA
IAB Research Area Wireless, RF & Smart Dust
Researcher(s) Robert A. Schneider
Advisor(s) Clark T.-C. Nguyen
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