VHF wide-bandwidth low impedance monolithic crystal filter havin

Details VHF wide-bandwidth low impedance monolithic crystal filter havin VHF wide-bandwidth low impedance monolithic crystal filter havin

1990-02-15

1991-12-24

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333191, 310366, H03H 956

Patent

active

050756516

ABSTRACT:
The present invention relates to a monolithic crystal filter having a passband of at least 30 Khz and a center frequency greater than 120 Mhz. This filter includes a piezoelectric substrate, a plurality of input electrodes conductively coupled together via a thin coupling bar, a plurality of output electrodes conductively coupled together via another thin coupling bar, and at least one common electrode disposed opposite to the plurality of input and output electrodes. The input and output electrodes are aligned on the substrate such that they electroacoustically couple along a crystallographic axes thereof. Multicoupling is provided along another crystallographic axes via the plurality of conductively coupled input and output electrodes, respectively. As a result of multicoupling, fifth overtone mode operation is now possible. In addition, the coupling bars, connecting the respective input and output electrode pluralities in parallel, reduce the filter's overall impedance without disrupting spurious response design parameters.

REFERENCES:
patent: 3487318 (1969-12-01), Herrman
patent: 3697788 (1972-10-01), Parker et al.
patent: 3838366 (1974-09-01), Coussot
patent: 4581556 (1986-04-01), Yamamoto

Affiliated with

Also associated with

Rating

VHF wide-bandwidth low impedance monolithic crystal filter havin does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with VHF wide-bandwidth low impedance monolithic crystal filter havin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and VHF wide-bandwidth low impedance monolithic crystal filter havin will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-45955