Lignes Telegraphiques Et Telephoniques

Etienne Langolis

Herbert Ernyei

An electromechanical bandpass filter includes at least one real pole consisting of vibrating resonators and couplers between adjacent resonators arranged as filter cells connected in parallel. Each cell includes a coupler and a half of each of the adjacent resonators. At least one bridge extends over at least one resonator and the image mobility of the cells which are spanned by the bridge is equal to the image mobility of the cells in an unbridged electromechanical filter of the same type and having the same passband.

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Paris, France

Etienne Langolis