Alcatel

Alcatel Alsthom Compagnie Generale D'electricite

Natalie Trembath

Dieter Pelz

An adjustable microwave diplexer comprising two combline filter sections (A and B). Each filter section has at least three tunable resonator elements (,and,). Non-adjacent resonator elements of one section (A) are inductively coupled by an adjustable coupling element (,), and non-adjacent resonator elements of the other section (B) are capacitively coupled by an adjustable capacitor element (,). This arrangement provides the means to achieve adjustable transmission zeros above the passband of filter A and below the passband of filter B to provide the diplexer with two highly selective filters.

Microwave diplexer arrangement

An arrangement for adjustably coupling a radio frequency input port to a resonator element of the filter. The arrangement comprises a resilient conductor (19) which extends from the input port (15) into the electric field of a resonator element (2). The remote end of the resilient conductor resiliently abuts the point (20) of an adjustment screw (20a). Operating the screw moves the resilient conductor in relation to the electric field and alters the capacitive coupling between the input port and the resonator element for fine tuning the impedance match of the input to the filter.

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North Croydon, Australia

Natalie Trembath