Surface Acoustic Wave (SAW) filters are passive components used in RF and microwave applications for signal filtering.
Key Features:
- • Operate from ~10 MHz to ~3 GHz
- • Low insertion loss
- • High selectivity and stability
- • Compact size, suitable for mobile devices
- • Fabricated on piezoelectric substrates (e.g., quartz, LiNbO₃)
Working Principle:
Interdigital transducers (IDTs) on the substrate convert electrical signals to surface acoustic waves and back, filtering based on wavelength.
Applications:
- • Mobile phones (RF front-end)
- • TV tuners
- • GPS and wireless modules
- • IoT devices
Note: SAW filters are sensitive to temperature; TC-SAW or FBAR may be preferred for high-stability needs.