Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Reexamination Certificate
2005-10-06
2009-02-10
Chang, Daniel D (Department: 2819)
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
C333S203000, C333S134000
Reexamination Certificate
active
07489215
ABSTRACT:
The invention relates to a high frequency filter of coaxial construction, comprising an outer conductor housing with a housing base and a housing wall, whereby several resonators are embodied in the outer conductor housing, each comprising an inner conductor tube, electrically-coupled to the housing base. At least one part of adjacent resonators are electrically-coupled to each other by means of at least one coupling opening in the outer conductor housing. Said filter is characterized in that one or more recesses are embodied in the housing base, between at least one part of the inner conductor tube of adjacent resonators.
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K.V. Puglia: “A General Design Procedure For Bandpass Filters Derived From Low Pass Prototype Elements: Part II,”Microwave Journal, Tutorial, pp. 114, 116, 120 Jan. 2001.
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Rottmoser Franz
Sieraczewski Dietmar
Watzenberger Wilhelm
Chang Daniel D
Kathrein-Werke KG
Nixon & Vanderhye PC
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