Patent ID: 7439925

Claim:
A dual band antenna with a corrugated feed horn, used for receiving at least two frequency bands electromagnetic signals, comprising: a waveguide; a feed horn assembly, connected to a top end of the waveguide and divided into at least two portions, a first portion thereof being close to an inside thereof, and a second portion thereof being connected to an outside of the first portion; the first portion being provided with at least two cylindrical rings extended upward from the bottom of the feed horn assembly; the second portion being provided with at least two cylindrical rings extended upward from the bottom of the feed horn assembly; the plurality of cylindrical rings being arranged outward from an inner part of the feed horn assembly; a groove being disposed between two adjacent cylindrical rings of the first portion; a place between the cylindrical ring of the first portion and the cylindrical ring of the second portion and a place between two adjacent cylindrical rings of the second portion being all disposed with a groove; the depth of the groove of the first portion being different from the depth of the groove of the second portion; whereby, by adjusting a depth and width of the grooves and a wall width and number of loops of the cylindrical rings of the first and second portions, the first and second portions are respectively allowed to respond the electromagnetic waves of different frequency bands so as to receive at least two frequency bands electromagnetic signals.