Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1994-11-14
1996-11-05
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310348, 310361, 333192, H01L 4108
Patent
active
055720820
ABSTRACT:
The present invention relates to a low profile monolithic crystal strip filter and filter package. The filter includes an AT-cut rectangular strip of quartz crystal. The filter further includes input, output and ground electrodes which are formed in a symmetrical pattern on the strip. Each electrode is connected to its respective mounting or ground contact by a flag. The electrodes, contacts and flags have a predetermined size and shape, and are arranged in a predetermined configuration on the crystal strip to minimize spurious responses and insertion losses. The crystal strip is mounted to an HC-45 or HC-49 base to minimize production costs. The output signal of the filter has a center frequency of about 4 to 500 MHz, a 3 dB bandwidth of about 3 to 250 kHz, an ultimate of better than 60 dB, standard insertion losses for the number of poles in the filter and commercially acceptable spurious responses.
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Crystal Filters-Design, Manufacture and Application, by Robert G. Kinsman.
Dougherty Thomas M.
Sokol Jeffrey S.
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