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US 4,060,774 AGranted
Electromechanical band-pass filter for high frequencies
AssigneeSociete Lignes Telegraphiques et Telephoniques
InventorHerbert Ernyei
Life of this patent
Estimating the term…
Abstract
In an electromechanical filter made of longitudinally vibrating cylindrical metal bars connected through bending vibrating coupling rods, the coupling rods are connected to one of the end faces of said resonators. A plurality of resonators are connected to a unitary rod.
Claims4
An electromechanical band pass filter comprising:
- substantially cylindrical mechanical resonators operating in a longituinal mode arranged with their axes parallel and in the same plane;
- wires operating in a bending mode coupling said resonators so that two adjacent resonators are coupled through a single quarter wave length wire connected at one of their terminal faces located in a same plane, and said resonators are divided into two sets, all the resonators of one set having one first terminal face in a first plane and all the resonators of the other set having a second terminal face in a second plane, one resonator belonging to both sets and the couplers for each set being a single wire.
An electromechanical band pass filter comprising:
- substantially cylindrical mechanical resonators operating in a longitudinal mode arranged with their axes parallel and in the same plane;
- wires operating in a bending mode coupling said resonators so that two adjacent resonators are coupled through a single quarter wave length wire connected at one of their terminal faces located in the same plane, and the second of their terminal faces are located in different planes parallel to said first plane.
An electromechanical band pass filter comprising:
- substantially cylindrical mechanical resonators operating in a longitudinal mode arranged with their axes parallel and in the same plane;
- wires operating in a bending mode coupling said resonators so that two adjacent resonators are coupled through a single quarter wave length wire connected at one of their terminal faces located in the same plane and said resonators have different cross sections to meet the resonant frequency requirements of parametric filters.
Dependencies are inferred from the claim text.