Patent ID: 9300042
Filing Date: 2016-03-29
CPC Classification: H01P,H01Q

Claim Text:
1. A dual band concentric antenna feed comprising: an outer conductive tube having an inner surface; an inner conductive tube having an outer surface, the inner conductive tube positioned inside the outer conductive tube and coaxially aligned to a shared axis that extends a length of the outer conductive tube and the inner conductive tube, wherein a coaxial waveguide formed in a space between the inner surface of the outer conductive tube and the outer surface of the inner conductive tube supports a first frequency band, and wherein a circular waveguide formed within an inner surface of the inner conductive tube supports a second frequency band; at least one transformer in the coaxial waveguide; a filter in the coaxial waveguide, the filter being offset from the at least one transformer, the filter designed so that, when the filter is evaluated independently over a first frequency band, with respect to an input port of the filter and with respect an output port of the filter, the filter is inductive at frequency f a dielectric plug in the coaxial waveguide, the plug being offset from the at least one transformer and the filter and positioned near an aperture end of the concentric antenna feed.