RF MEMS for channelizing low-power radios

RF MEMS technologies are evaluated with regard to their potential to realize the RF frequency gating function targeted for true software-defined cognitive radios and ultra-low power autonomous sensor network radios. Here, RF channel-selection, as opposed to band selection, is key to substantial increases in call volume with simultaneous reduction in power consumption. The MEMS technologies most conducive to RF channel-selecting front-ends include vibrating micromechanical resonators that exhibit record on-chip Q´s at GHz frequencies; resonant switches that provide extremely efficient switched-mode power gain for both transmit and receive paths; and medium-scale integrated micromechanical circuits that implement on/off switchable filter-amplifier banks.