10 GHz lens horn made form aluminium and Rexolite 1422

10 GHz Dielectric lens Feedhorn

I’m working on a simple, waterproof, reproducible design for a 10 GHz dish feed for folks who are taking part in the group buy project to build F6BVA 10 GHz to UHF transverters. This uses a probe launch into a round waveguide machined from solid aluminium. The lens is made from Rexolite 1422, which is a free-machining cross-linked polystyrene with well-defined relative permittivity and a loss tangent of about 0.0004. This one is designed for a rather flat offset dish I have with equivalent f/d about 0.75, but I will be doing some for more common offset dishes

Finished 10 GHz feedhorn with Radiall SMA connector

The body is turned and bored from a bit of aluminium round bar

The flat area is too large on this one, I’ll make it narrower on subsequent versions so I don’t have to shorten those M2.5 screws

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