Surface Acoustic Wave Band Elimination Filter. Phase 1
R F MONOLITHICS INC DALLAS TX
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SAW devices are monolithic signal processing elements for frequencies between 10 MHz and 2000 MHz. SAW devices have many performance advantages which have resulted in wide ranging applications in military, commercial, and consumer systems. However, it has been generally recognized that SAW technology has been limited to bandpass filter functions and further that these filters typically have very high insertion loss typically greater than 20 dB. This research program extends SAW technology to the bandstop filtering function with very low insertion loss and very high passband power handling capability. Prototypes of the SAW notch filter which are being developed under this program have already demonstrated insertion loss of less than 2dB. This notch filter could be very useful for eliminating specific interfering signals at a receiver front end without degrading sensitivity. The high performance notch filters described in this report are the result of research into methods for using inherently high Q of SAW devices for notch filters.
- Line, Surface and Bulk Acoustic Wave Devices