Patent ID: 8362855

Claim:
An RF cavity filter comprising: a housing having at least one cavity defined therein; a cover coupled to an upper portion of the housing; at least one resonator contained within the at least one cavity; at least one hole formed in the cover; at least one grounding bolt made of an elastic material and configured to be inserted into the hole, the grounding bolt having a screw thread formed on a part of an outer perimeter thereof and having a center hole in a center portion thereof; and at least one tuning bolt inserted into the housing through the center hole along a screw thread formed on an inner perimeter of the center hole, wherein the grounding bolt further comprises: a body having a cylindrical shape; an inner screw thread part formed on an inner perimeter of the center hole; and a flange part formed on a lower portion of the body, the flange part shaped as a round disc, being in contact with the tuning bolt and a cover of the RF cavity filter and having an upward slope of a designated incline for being in contact with the tuning bolt and the underside of the cover.