Radio Frequency (RF) & Wireless Design

I came across this article on Lens Horn Antennas from Anteral :

https://www.everythingrf.com/news/details/15303-anteral-introduces-lens-horn-antennas-from-8-to-170-ghz-for-high-gain-applications

Lens Horn Antennas in this case are Horn Antennas :

https://en.wikipedia.org/wiki/Horn_antenna

With a Lens covering the aperture :

https://en.wikipedia.org/wiki/Lens

"These antennas are conical horn antennas with a plano-convex Teflon (PTFE) lens added in the aperture, in order to apply phase correction and achieve superior performance with minimum size."

The lens helps focus the RF energy into the waveguide at the end of the horn and reduces reflective energy losses in the path for additional gain.

The material has a relative permittivity known as the dielectric constant that will provide lowest loss while obtaining the best directivity. https://en.wikipedia.org/wiki/Relative_permittivity#Terminology