Bandpass filter

US6294970A · kind A · utility

Assignee

• Spinner GmbH Elektrotechnische Fabrik · DE

Inventors

• Franz Pitschi · Rottach-Egern, DE
• Manfred Lang · Wuppertal, DE
• Werner Appel · Starnberg, DE
• Hans Pinzel · Bruckmühl, DE

Key dates

• Filing date: Dec 11, 1998
• Grant date: Sep 25, 2001
• Expiry date: Dec 11, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01P11/007
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A bandpass filter, includes a series of waveguide resonators positioned along a common longitudinal axis so as to define at least a first resonator and a last resonator, whereby adjacent resonators are mechanically linked to one another by a common coupling plate of sheet metal member which is formed with coupling slots for electrically coupling the resonators, with the first and last resonators each being closed by an end plate of sheet metal. Each resonator is formed from a longitudinally welded sheet metal, and the end plates and the common coupling plate are each formed with circumferentially spaced tabs which are bent so as to extend along the adjoining waveguide, whereby the tabs are welded to the waveguide, and the joints between the end plates and the common coupling plate, on the one hand, and the adjacent waveguides, on the other hand, are soldered