Waveguide-fed scalar corrugated conical horn

Image of the Waveguide-fed scalar corrugated conical horn.

When compared to the Standard corrugated conical and Axial choke corrugated horns (already in Antenna Magus), the Scalar corrugated conical horn has a lot of similarities, a few advantages and a few disadvantages.

Cross-sectional view of three different corrugated horn antennas.

The above image shows cross-sectional views of three corrugated horn types available in Antenna Magus. Note that the Scalar horn's corrugations are normal to the flare. This makes it much harder to manufacture when compared to the standard Corrugated horn and Axial choke which have corrugations normal and parallel to the main axis of the horn respectively. The Scalar horn is slightly wider band - up to 2:1 bandwidth compared to 1.5:1 of the standard Corrugated horn. In Antenna Magus, both the Scalar- and Axial choke corrugated horns can be designed for maximum main beam flatness. The graph below compares the gain vs angle for all three antennas designed at 10 GHz for 15 dBi gain. Both the Scalar- and Axial choke horns have similar physical dimensions (approximately 185 x 185 x 125 mm3) with 9 and 20 corrugations respectively where the standard Corrugated horn is almost half the size (approx. 74 x 74 x 84 mm3 ) with only 6 corrugations. Note that although the standard Corrugated horn is more compact with fewer corrugations it has lower main beam efficiency compared to its larger counterparts.

Main beam gain comparisons for three different corrugated horn antennas.