Accession Number : AD0699799

Title :   NOTCH FILTERS USING PIEZOELECTRIC CERAMICS.

Descriptive Note : Technical rept.,

Corporate Author : ARMY ELECTRONICS COMMAND FORT MONMOUTH N J

Personal Author(s) : Rand,Abraham

Report Date : OCT 1969

Pagination or Media Count : 34

Abstract : Several notch filter networks using ceramic benders are analyzed to determine bandpass characteristics. These include the bridged-R, with inductive terminations, and bridged R-C networks. Analyses and experiments show that the simple bridged-R has a rising attenuation with increasing frequency, caused by the shunting capacitance of the bender element. The inductively terminated network can have low attenuation at a single frequency in the passband, depending on coil Q. However, for optimally flat bandpass in very wideband applications (e.g., audio bandpass), the attenuation at both extremes is equal to or larger than the attenuation of the bridged-R network at the high frequency end. The bridged R-C network provided the flattest bandpass at about 3.5 dB attenuation with a 23-dB notch. The notch bandwidth at 6dB is about 1% of the notch frequency. The practical frequency range of application of ceramic benders (considering size limits, fragility and nodal point mounting problems) is approximately 200 Hz to 20 kHz. (Author)

Descriptors :   (*BAND PASS FILTERS, PIEZOELECTRIC CRYSTALS), BENDING, MINIATURE ELECTRONIC EQUIPMENT, INTEGRATED CIRCUITS, ELECTRIC FILTERS, AUDIO FREQUENCY

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE