Patent ID: 8164533

Claim:
A horn antenna for transmitting and/or receiving radio frequency signals in multiple frequency bands, the horn antenna comprising: an exterior surface; an interior surface, the interior surface forming a hollow area in the horn antenna, the hollow area being substantially funnel-shaped and comprising first and second ends, the hollow area decreasing in diameter from the first end to the second end, the interior surface being smooth-walled and comprising a plurality of slope discontinuities; an aperture disposed at the first end and comprising the largest diameter of the hollow area; and a throat disposed distally from the aperture and at the second end of the hollow area, the throat comprising the smallest diameter of the hollow area, wherein the horn antenna is configured to transmit and/or receive radio frequency signals in multiple frequency bands that are spread over more than an octave bandwidth and with at least a 2.25-to-1 bandwidth ratio, and wherein the interior surface does not include a slope having a ninety-degree angle from an axis coaxial to a center diameter of the horn antenna.