Discussion
What is the purpose of a splash plate feed on a small reflector?
Answer: D
A small disc facing the open end of an axial waveguide turns the radiation around so that it illuminates the reflector from the focus, without the bulk of a horn pointing backwards. It is cheap and compact and is common on offset domestic dishes and small radars. Weather protection, mounting and polarisation conversion are all separate functions handled by other parts. Redirecting radiation with a small reflector rather than a shaped horn is a neat piece of packaging.
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