Concentric, two stage coarse and fine tuning for ceramic resonators

A resonator assembly, comprising:

• a conductive housing defining a cavity;
• resonator means for resonating at a predetermined frequency, said resonator means being disposed within the cavity;
• first tuning means for tuning said resonator means, said first tuning means having an axis and being movable with respect to said resonator means;
• and
• second tuning means for tuning said resonator means, said second tuning means being movably disposed co-axially with said first tuning means.

A filter, comprising:

• at least one resonator assembly, said resonator assembly having:
• a conductive housing defining a cavity;
• a resonator disposed within the cavity and having a longitudinal bore;
• a first tuning assembly having a longitudinal bore, said first tuning assembly being movably disposed along the bore of said resonator;
• and
• a second tuning assembly movably disposed along the bore of said first tuning assembly.

A communication system, comprising:

• communication equipment for performing at least one of sending and receiving a communication signal;
• at least one filter, said filter including:
• at least one resonator assembly, said resonator assembly having:
• a conductive housing defining a cavity;
• a resonator disposed within the cavity and having a longitudinal bore;
• a first tuning assembly having a longitudinal bore, said first tuning assembly being movably disposed along the bore of said resonator;
• and
• a second tuning assembly movably disposed along the bore of said first tuning assembly.