Societe Lignes Telegraphiques Et Telephoniques

Societe Telegraphiques Et Telephoniques

Etienne Langlois

Herbert Ernyei

In an electromechanical filter, poles are obtained by interconnecting an electrical reactance between the input and output of the filter. It is shown that this impedance behaves as a mechanical bridge.

Electromechanical filters

An electromechanical filter comprising resonators interconnected by couplers and at least one bridge strapping over several resonators in which said resonators are longitudinally vibrating, said couplers and bridge are bending and the number of strapped resonators is a multiple of four. Such a filter shows improved phase characteristic within the pass band.

Electromechanical filter structure

The resonance frequency of rod shaped mechanical resonators with a high quality factor such as used in electromechanical filters is obtained by shock exciting the resonator into vibration introduced into a solenoid collecting a voltage induced by said vibration across the solenoid terminals. Said shock is either mechanical or magnetic.

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Paris, France

Etienne Langlois