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