MONOLITHIC PIEZOELECTRIC FILTER AND METHOD FOR PRELIMINARY SETTING OF THE PIEZOEL FILTER

摘要

The invention relates to piezoelectric technology and can be used in the development, manufacture and tuning of elements of frequency selection of signals. The technical result to which the invention is directed is to expand the tuning capabilities of the piezoelectric element, in particular, to provide regulation (increase or decrease) of the filter passband without changing the size of the gap between the electrodes. The method of presetting the piezoelectric filter element consists in first spraying the electrodes on the piezoelectric plate with a frequency decrease by several times, then applying an additional layer of material in the form of narrow strips with decreasing frequency to the nominal one. A monolithic piezoelectric filter contains a housing (1) with two systems of contact pads (6, 7), one of which is intended for supplying a high-frequency signal, and the other is intended for grounding at least one piezoelectric element (2), which is a piezoelectric plate deposited on electrodes (3), on which an additional layer of material (4) is applied in the form of narrow strips. If two or more piezoelectric elements (2) are installed in the filter, the connection points of each adjacent piezoelectric elements (2) are interconnected electrically and mechanically with a jumper (5).