METHOD TO INCREASE TEMPERATURE STABILITY OF FREQUENCY OF NARROW-BAND ACOUSTIC SURFACE WAVE FILTER AND NARROW-BAND ACOUSTIC SURFACE WAVE FILTER WITH HIGHER TEMPERATURE STABILITY OF FREQUENCY Russian patent published in 2013 - IPC H03H3/10 

FIELD: radio engineering, communications.

SUBSTANCE: method to increase temperature stability of frequency of a narrow-band acoustic surface wave filter is based on selection of a cut angle of a piezoelectric substrate that is optimal from the point of view of temperature stability of frequency, at the same time at ambient temperature, below which frequency exceeds the permissible level, the substrate is heated by a resistive heater shaped according to a thin-film technology on a dielectric plate and adhered to a piezoelectric substrate, as temperature becomes several degrees higher than the one, at which the heater was switched on, it is switched off, at the same time the heater is switched on and off by means of a switch controlled from signals of a thermal sensor adhered to the piezoelectric substrate. The device comprises a piezoelectric substrate, on which a structure is made from double-mode resonators, and also a resistive heater, a thermal sensor, a switch.

EFFECT: development of a narrow-band filter with increased temperature stability.

2 cl, 5 dwg