Application range

Our engineers are prepared to design filters for your specific applications. The center frequency range of torsional filters is from under 100 kHz to over 700 kHz with bandwidths as low as 0.02 percent and as high as 5 percent of the center frequency. Bandwidths above 1 percent may require tuning inductors in the termination circuit. The inductor-less filters simply require a specified parallel capacitance and resistance for proper termination as shown in the typical test circuit. We design and manufacture filters that have as few as two resonators and as many as twelve resonators.

Please provide us with your frequency, phase or delay response requirements, and we will quickly give you an estimate of the complexity and characteristics of a mechanical filter that will do the job.

The FP and PS packages will enclose up to 8 resonators and the LP and PL packages will enclose up to 12 resonators. The FP and LP are hermetically sealed metal packages. The PS and PL are non-hermetic plastic packages. Smaller plastic packages are available for two resonator filters. A surface mount package is also available similar to the PS package in size.

Application range

 Typical filter test circuit

The 30 pF includes board stray.