Archive for May, 2011

Blog follow up – Have we reached the tip of the ice berg?

Wednesday, May 25th, 2011

A while ago I blogged on finding a simple antenna solution for radiating down a tunnel in both directions and that one of our engineers already came up with the perfect solution. Interestingly enough one of our blog readers came up with exactly the same idea – a dual bore-sight horn. He actually created a FEKO model and calculated the gain patterns shown below. Our engineer replied, “I see? yeah, that is pretty much spot on, although I tweaked mine a bit to have a square flare and reduced length.” So he claimed that it can be improved.

FEKO model preview

FEKO model preview

Calculated gain pattern

Calculated gain pattern


However shortly after that one of our blog readers actually came up with an even simpler idea – a back-to-back axial mode helix using the same ground plane, fed by a power divider. The blog reader who originaly told us about his problem really liked that idea and decided to go for this option. The photo below is his first prototype and he is currently busy optimising his design for better performance and simpler manufacturing.

Back-to-back axial mode helix prototype

Back-to-back axial mode helix prototype

Thank you to everyone who responded with their ideas. In the end we could help our engineer friend to make an excellent choice!

Author: Robert Kellerman