Allen Telecom Group, Inc.

Erik W Lilieholm

John M Stronks

Chia-Sam Wey

Johnny Gee

A filter including a cavity, a resonator structure and having a plastic resonator support and plastic tuning assembly suitable for both manual and automatic tuning applications. The dielectric resonator structure comprises a substantially cylindrical ceramic resonator, and a plastic support having a plurality of spaced apart elements diverging from a shoulder of the plastic support, each of the elements terminating in a cantilevered stop, the cantilevered stops holding the ceramic resonator in a fixed relationship with respect to the plastic support and the cavity. A resonator tuning assembly is provided that comprises a substantially cylindrical ceramic tuning element and a plastic tuning shaft having a coupling means at a first end and being threaded along a portion of its length. A ceramic tuning element is affixed to the shaft at a second end. A substantially cylindrical tuning cap is threadably engaged with the plastic tuning shaft, such that rotational motion of the tuning shaft within the tuning cap results in linear motion of the tuning element with respect to the tuning cap.

Filter assembly comprising a plastic resonator support and resonator

A multichannel combiner includes a plurality of input ports for connection to associated transmitters, narrow bandpass filters associated with each port, and an output port for connection to an antenna system. The output impedance of the filters is selected to be substantially lower than that used in conventional combiners, such that undesired reactance produced in the combiner over its operating range is much reduced. The combiner further includes an impedance transformer to match the low output impedance of the filters to the design impedance of the antenna system.

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Reno, NV, United States of America

Erik W Lilieholm