Extended Information

The working principle of a Surface Acoustic Wave (SAW) filter involves the input transducer converting an electrical signal into a surface acoustic wave that propagates along the surface of a piezoelectric crystal. The output transducer then converts the received acoustic wave back into an electrical signal for output. Key features of SAW filters include: substantial design flexibility, compatibility with both analog and digital systems, excellent group delay uniformity, and precise frequency selectivity. They offer a frequency range from 10 MHz to 3 GHz, low input and output impedance errors, minimal transmission loss, strong resistance to electromagnetic interference, high reliability, and compact size. The volume and weight of SAW filters are approximately 1/40 and 1/30, respectively, of those of ceramic dielectric filters. Additionally, SAW filters can perform a variety of complex functions. SAW filters are highly effective in suppressing high-order harmonics, image frequencies, transmission leakage signals, and various parasitic interferences in electronic information equipment. They can achieve precise amplitude-frequency and phase-frequency filtering, which is challenging to accomplish with other filter types.