Patent ID: 7078990

Claim:
A tunable radio frequency (RF) cavity resonator having reduced generation of passive inter-modulation, the tunable RF cavity resonator comprising: a cavity body; a fixed tuning post which is fixed to a first end of the cavity body, the fixed tuning post having an outer wall forming an exterior surface of the fixed tuning post, and having an inner wall forming an interior space within the fixed tuning post; a dielectric rod disposed in the interior space of the fixed tuning post such that a first spatial gap is maintained between an outer surface of the dielectric rod and the inner wall of the fixed tuning post; a tuning screw connected to a first end of the dielectric rod near the first end of the cavity body; and a tuning element disposed on a second end of the dielectric rod opposite the first end of the dielectric rod, and being disposed to move within the interior space of the fixed tuning post such that a second spatial gap is maintained between an outer surface of the tuning element and the inner wall of the fixed tuning post.