Patent ID: 7659861

Claim:
A dual frequency feed assembly for receiving signals of both a first band and a second band lower than the first band, or receiving signals of one of the first band and the second band while transmitting signals of the other band, the dual frequency feed assembly comprising: an orthogonal-mode transducer, comprising: a core unit, comprising: an inner waveguide; an outer waveguide having a diameter larger than that of the inner waveguide, wherein the outer waveguide and the inner waveguide are concentric; a first band output/input port connected to the inner waveguide; and a second band output/input port; and at least a pair of detachable branch waveguides disposed with the hollow portion facing the core unit and joined thereto across a first plane substantially parallel to a longitudinal axis of the core unit; wherein second band signals travel from the outer waveguide to the second band output/input port via at least one of the branch waveguides.