A SAW Filter consists of two interdigital transducers
(IDTs) on a piezoelectric crystal substrate . The IDTs consist
of interleaved metal electrodes which are used to launch and
receive the waves, so that an electrical signal is converted
to an acoustic wave and then back to an electrical signal.An
impulse voltage applied to the transducer generates, due to
piezoelectricity, mechanical displacements in the crystal between
electrodes (or fingers) of opposite polarity. These crystal
displacements propagate and create
a wave at the surface of the crystal perpendicular to the electrodes.
The inverse phenomenon occurs when this acoustic wave travels
under another transducer: it in turn creates an electromagnetic
output signal. The characteristic of frequency depends on the
pattern of electrodes.
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Feature
•
Application
• Mobile Communication
• Handsets
• Repeater • Base Station
• Wireless Data
Communication • WLL •
GPS Receiver • Bluetooth • WLAN • Digital TV
• Keyless Entry • DAB/DARS • Digital Radios
• Wire Data Communication • SONET/SDH •
Cable Modem • Optical Transmission Modules
