A dual band concentric antenna feed characterized in that it comprises: 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 (f 1 -f 2 ), being defined between a first frequency (f1) and a second frequency (f2), and wherein a circular waveguide formed within an inner surface of the inner conductive tube supports a second frequency band (>f 3 ), being defined at a higher frequency than the first band of frequencies; a first transformer in the coaxial waveguide , wherein the first transformer is formed in the coaxial waveguide as a protrusion extending from the outer surface of the inner conductive tube ; a filter in the coaxial waveguide , the filter being offset from the first transformer, wherein the filter comprises ribbed protrusions extending from the outer surface of the inner conductive tube , wherein with respect to an input port of the filter and with respect to an output port of the filter, the filter is configured to be inductive at the first frequency (f1) capacitive at the second frequency (f2), and well matched near mid-frequency (f 1 +f 2 )/2; and a dielectric plug in the coaxial waveguide , the plug being offset from the first transformer and the filter and positioned at an aperture end of the concentric antenna feed, wherein the plug fills the space between the outer surface of the inner conductive tube and the inner surface of the outer conductive tube . 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 (f 1 -f 2 ), being defined between a first frequency (f1) and a second frequency (f2), and wherein a circular waveguide formed within an inner surface of the inner conductive tube supports a second frequency band (>f 3 ), being defined at a higher frequency than the first band of frequencies; a first transformer in the coaxial waveguide , wherein the first transformer is formed in the coaxial waveguide as a protrusion extending from the outer surface of the inner conductive tube ; a filter in the coaxial waveguide , the filter being offset from the first transformer, wherein the filter comprises ribbed protrusions extending from the outer surface of the inner conductive tube , wherein with respect to an input port of the filter and with respect to an output port of the filter, the filter is configured to be inductive at the first frequency (f1) capacitive at the second frequency (f2), and well matched near mid-frequency (f 1 +f 2 )/2; and a dielectric plug in the coaxial waveguide , the plug being offset from the first transformer and the filter and positioned at an aperture end of the concentric antenna feed, wherein the plug fills the space between the outer surface of the inner conductive tube and the inner surface of the outer conductive tube . <EOS>