Abstract: A shielded, floating ground RF input connector assembly is provided by a conductive enclosure having an aperture in one wall. A coaxial connector is mounted with both the inner and outer conductors extending through the aperture and with the outer conductor spaced from the aperture. A conductive flange extends radially from the outer conductor within the enclosure and covers the opening of the aperture with the flange closely spaced by a member of dielectric material from the inside wall of the enclosure. Bypass capacitors are connected between the conductive flange and the enclosure.

Abstract: A helical resonator includes a helical coil within a metal enclosure, with the windings at one end of the coil reduced in diameter and shorted to each other so as to form a cylindrical conductive member. The cylindrical conductive member provides one plate of a variable capacitor the other plate of which is partially formed by one wall of the enclosure which is adjacent to the windings of reduced diameter. A screw extends through the one wall of the enclosure and into the cylindrical member. An adjustment of the screw controls the resonant frequency of the cavity.