Crystal notch filter comprising discrete quartz crystals coupled

Details Crystal notch filter comprising discrete quartz crystals coupled Crystal notch filter comprising discrete quartz crystals coupled

1989-07-05

1991-07-09

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333189, H03H 9205

Patent

active

050309340

ABSTRACT:
An improved crystal notch filter is disclosed with a large passband-to-stopband ratio. The filter has individual sections with discrete crystal devices. In one embodiment as a 55 MHz trap, the filter has a passband from about 50 MHz to about 212 MHz with a 1 KHz stop band about a center frequency that may be tuned by means of a laser-trimmed bridging resistor.

REFERENCES:
patent: 1977751 (1934-10-01), Zobel
patent: 2248776 (1941-07-01), Och
patent: 4028647 (1977-06-01), Yee
patent: 4099149 (1978-07-01), Yee
patent: 4246554 (1981-01-01), Swanson et al.
patent: 4423394 (1983-12-01), Kinsman

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