圧電共振子を用いたメカニカルフィルタの試作

概要

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This paper deals with construction methods and experimental results of electromechanical filters consisting of two rectangular piezoelectric resonators and one or two couplers. The resonators vibrate transversely and are coupled with torsionally or transversely vibrating couplers.　First, construction of the piezoelectric resonator is described. The resonator is a rectangular plate made from lead zirconate and lead titanate ceramics.　Metal-plating electrodes formed on both surfaces of the rectangular piezoelectric plate are split into two parts and the diagonal opposite electrodes among them are connected with each other electrically.　When an ac voltage is applied between the electrical terminals, the upper part of the plate is lengthened and the lower one is contracted. Thus, the first and the third modes of transverse vibration are excited in the resonator.　Secondly, three design methods of the mechanical filter are described. By exchanging the connection of out put terminals, two kinds of construction of the mechanical filter are obtained, one is of attenuation poles, and the other has none of attenuation poles.　Lastly, some experimental results of the mechanical filters suppressJng higher harmonics are described.
山形大学の論文
1973-01-20