WR90 flange horn antenna

Customized version of http://www.thingiverse.com/thing:161428
Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=161428

The photo shows the horn mounted on an old HP Model X421A detector (WR-90, 8-12 GHz).

Added copper foil trimmed to the right shape for the interior faces of the horn and waveguide throat. Note this part has WR90 waveguide dimensions slightly incorrect. Unlike most of the standard waveguides, WR90 height is not 1/2 the width, it should be exactly 0.9 x 0.4 inches. The print uses 0.9 x 0.45 inches for the inside dimensions. Still works, just not a perfectly smooth transition.