Abstract: A dual-polarized radiating element having a first dipole and a second dipole attached to a reflector. Each conductive first half dipole and each conductive second half dipole of each of the first and second dipoles having a first surface and an opposite second surface. In one embodiment, the first surface of each first half dipole extends offset to the first surface of the respective second half dipole. Each of dipoles includes a conductive element having a first side portion spaced apart from and secured to the first surface of the respective first half dipole and a second side portion spaced apart from and secured to the first surface of the respective second half dipole, and is connectible to an input signal so as to be capable of being electromagnetically coupled to the first and second dipoles.

Abstract: A coupler for coupling RF electromagnetic energy into or out of a resonant cavity of the type which includes a control post.

Abstract: A coaxial cavity resonator is described. The resonator includes a tapered inner conductor for increasing the Q of the cavity.

Abstract: A tunable resonant cavity including a cavity housing having top and bottom walls with a post disposed in said cavity extending from die bottom of the cavity toward and spaced from the top. The length of the post is adjustable to adjust the resonant frequency of the cavity. The materials forming the resonant cavity are selected to provide temperature compensation.

Abstract: A coupling mechanism for coupling adjacent cavities which includes a window having side walls joining two cavities and a coupling member extending into said window between said side walls. The coupling member is movable between said side walls to adjust the coupling.

Abstract: A receive/transmit multi-cavity filter having input and output filter sections coupled to an antenna by a single cavity.