The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 2002
Filed:
Mar. 03, 2000
Jorma Ohtonen, Oulu, FI;
Filtronic LK Oy, Kempele, FI;
Abstract
The invention comprises a filter consisting of resonators ( . . . ) with a conducting housing, particularly to be used in networks operating on microwave frequencies. The couplings between the resonators are realised outside the conducting filter housing with the aid of a printed board ( ) over a wall ( ) of the housing. For a particular coupling a conductor strip ( ) extending from one resonator to another is formed on the printed board, and openings ( . . . ) are made in the resonator walls at the ends of the strips. In order to strengthen the coupling a coupling element ( ) extending into the resonator cavity can be fastened as an extension of the strip. The filter connectors ( . . . ) are also fastened to the printed board. The open filter housing ( ) and the inner conductors ( . . . ) or the resonators can be made as a homogenous body. The manufacturing costs and the tuning costs of a filter according to the invention are relatively low. The losses of the filter are relatively low, the filter is easy to modify, and on the printed board it is possible to realise also functions which are external to the filter.