SAW Band Pass Filters
Surface acoustic wave (SAW) band pass ﬁlters employ the piezoelectric effect to convert an electromagnetic signal into an acoustic signal and vice versa. A SAW bandpass ﬁlter provides sharp cut-off, very linear phase characteristics, high stability, and are highly reliable. Electrical signals are converted to a mechanical wave in a device constructed of a piezoelectric crystal or ceramic, and the wave is delayed as it propagates across the device before being converted back to an electrical signal. The delayed outputs are recombined to produce a direct analog implementation of a ﬁnite impulse-response ﬁlter. Anetech Electronics RF bandpass filters include a very broad range of SAW band pass ﬁlters that can be speciﬁed for operating frequencies from 4.75 MHz up to 6 GHz. They are extremely compact surface-mount devices and typically measure 2 x 2 x 0.5 mm, and can be as long as 50 mm in length.
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