SAW transformer-filter

Low-loss Surface Acoustic Wave (SAW) resonator-type filters, such as double mode SAW filters (or Coupled Resonator Filters, DMS/CRF), can be considered as transformers. Such a RF SAW “transformer-filter” could operate directly on one of the ISM bands and be useful, for example, in “wake-up” radios, since the RF voltage can be raised by passive means prior… (More)