SU942248A1 - Piezoceramic filter - Google Patents

Description

(S) PIEZOCERAMIC FILTER

   -. t,:. . . .

The invention relates to telecommunications and can be used in signal transmission devices and telemechanics;

Piezoceramic filters are known. rye made on ceramic disco. out vibrators l3

The disadvantage of such designs is the limited frequency range .JO

Closest to the assortment is a piezoceramic filter containing a piezoceramic plate in the form of a disc on one surface of which the input 3J% kTpoA, f5 is located and on the other output electrcd 2.

The disadvantage of the known phiper is the lack of possibility of damping subharmonic oscillations, which reduces its functionality 20.

The purpose of the invention is to enhance the functionality of the filter.

The goal is achieved by the fact that in a piezoceramic filto, containing a piezoelectric plate

In the disk where the input electrode is located on one surface and the output electrode is located on the other surface, the diameter of the input electrode is chosen to be smaller than the piezoelectric plate, and additional input electrodes are inserted symmetrically relative to the input electrode on the same surface of the piezoceramic plate.

The drawing shows the construction of a piezoceramic filter, two projections.

The piezoceramic filter contains a piezoceramic plate 1, an input electrode 2, an output electrode 3 and additional input electrodes

and 5.

Piezoceramic filter works

Claims (2)

in the following way. 3E AC electrical oscillations corresponding to the resonant frequency are supplied to the input and output electrodes. The filter has the lowest attenuation at the resonant frequency. When an impulse is excited by a research institute of a filter, subharmonic oscillations are excited in it that follow the useful signal. The cutoff frequency of data transmission is determined by the damping time of subharmonic oscillations. By applying a feedback signal to additional electrocuts, the proposed filter can suppress damped oscillations and shorten the time of information transfer, which leads to an increase in the speed of the device. Due to the possibility of controlling the oscillatory process, the field of application of the piezoceramic filter is expanded. Claims of the invention: A piezoceramic filter comprising a piezoelectric plate in the form of a disk, on one surface of which an input electrode is located, and on the other surface is an output electrode, so that, in order to expand the functionality of the filter, the diameter of the input electrode is selected with a smaller diameter of the piezoelectric plate, and additional input electrodes are introduced, which are located symmetrically relative to the input electrode on the surface of the piezoceramic plate ins. Sources of information taken into account in the examination of t.Matushek I. Ultrasonic engineering. P., 1962, p. 1965. 2. Ibid, p. 203 fig. 100 (prototype).