Frequency selection device

Abstract

Abstract PURPOSE: To increase the variable frequency range as well as selection degree Q. CONSTITUTION: At least one unit of elastic surface wave transducers 1 and 2 is distributed each on the sound wave propagation line which is formed on the piezoelectric element along with at least one unit of reflection electrodes (pump electrodes) 3 and 4 to which the AC signals are applied and in a close distance from transducer 1 and 2. As a result, the range of the variable selection frequency can be increased just by varying the frequency of the pump power source, at the same time increasing greatly the selection degree of the selection frequency. Furthermore, the stability of the selection frequency can be decided with the stability of the external oscillator, thus ensuring a higher stabilization. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Nobuo Mikoshiba
• 👤 Shoichi Minagawa

Bibliographic Details