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Sampling effect of distributed reflector arrays within a single-phase unidirectional SAW transducer
1Bell Northern Res. Ltd., Ottawa, Ont.
Summary
A novel transducer enables wideband, low-loss surface-acoustic-wave (SAW) comb filters. This is achieved through distributed reflector gratings, demonstrating efficient signal processing for advanced applications.
Area of Science:
- Acoustics
- Materials Science
- Electrical Engineering
Background:
- Surface-acoustic-wave (SAW) devices are crucial for signal processing.
- Achieving wideband, low-loss operation in SAW filters presents significant challenges.
Purpose of the Study:
- To investigate the wideband, low-loss operation of group-type single-phase unidirectional transducers.
- To demonstrate the effectiveness of distributed reflector gratings in enabling SAW comb filter functionality.
Main Methods:
- Theoretical analysis of transducer operation with distributed reflector gratings.
- Experimental validation using a 65-MHz SAW comb filter on 128 degrees Y-X lithium niobate.
Main Results:
- The transducer design facilitates wideband surface-acoustic-wave (SAW) comb filter operation.
- A 65-MHz filter exhibited 5 comb modes, 585-kHz bandwidth each, with 2.6-dB minimum insertion loss.
- An overall fractional bandwidth of 50% was achieved, confirming the device's capability.
Conclusions:
- Group-type single-phase unidirectional transducers are effective for wideband, low-loss SAW comb filters.
- Distributed reflector gratings are key to achieving this performance.
- The experimental results validate the theoretical predictions for advanced SAW filter applications.
