Patent ID: 6208221
Filing Date: 2001-03-27
Classification: H01P

Abstract:
An adjustable microwave diplexer arrangement comprising:a first combline filter section and a second combline filter section, each said filter section having at least three tunable resonator elements of which selected non-adjacent resonator elements of said first filter section are inductively cross-coupled by a respective adjustable inductive cross-coupling arrangement, and selected non-adjacent resonator elements of said second filter section are capacitively cross-coupled by a respective adjustable capacitive cross-coupling arrangement, wherein each said inductive cross-coupling arrangement comprises a moveable conductive element extending between associated non-adjacent resonator elements of said first filter section and in a spaced relationship therewith, each said conductive element being operatively attached to a first non-conductive manual adjustment means arranged to selectively vary said spaced relationship and thereby vary the magnitude of inductive cross coupling there between, and wherein each said capacitive cross-coupling arrangement comprises a movable capacitive element extending between associated non-adjacent resonators of said second filter section and in a spaced relationship therewith, each said capacitive element forming, with sections of its associated selected non-adjacent resonator elements, a variable capacitor means, each said capacitive element being operatively attached to a respective second non-conductive manual adjustment means arranged to selectively vary said spaced relationship between each capacitive element and said sections and thereby vary the magnitude of capacitive cross-coupling there between.