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CST – Computer Simulation Technology

Dual-Ridged Pyramidal Horn | Antenna Magus

Image of the Dual-ridged pyramidal horn (no sidewalls).

Horn antennas cover a wide variety of applications, many of which require UWB operation. A common technique used to achieve UWB performance in horn antennas, involves the inclusion of a tapered ridge in the flare, which serves as an impedance transition between the waveguide feed and free space.

This antenna is a variation of the traditional Dual Ridged Pyramidal horn, which is currently available in Antenna Magus. The side walls of the horn have been removed, whilst the extreme tips of the antenna flare have been chamfered. These modifications reduce the pattern degradation (beam splitting) seen at the higher frequencies with the traditional Dual Ridged Pyramidal horn. An increased pattern bandwidth of 11:1 is achieved before the beam splitting starts to occur. This is illustrated in the image below where the radiation patterns of both horns designed for an 11:1 bandwidth are shown at the highest frequency in the band. The degradation of the pattern of the horn with sidewalls is clear when compared to the horn without side walls. ...

A comparison of the radiation patterns of dual-ridged horn with and without side walls, showing the reduction in beam splitting at the higher frequencies for the design without side walls.

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