Mesh size for 10GHz

Dom Baines M1KTA
 

Was suggested ask here so here goes.

Bit of a rookie so might be a daft question:

If using a mesh reflector for a dish with size 2.5mm x 4.5mm does this mean it will be fine in one plane but might be very lossy in the other at 10Hz as 1/10th is c3.0mm. But by how much?
Should I cross the mesh so the centre (opposite prime focus) at least has no opening larger than 2.5mm ?

Solid dish had some wind-age issues and moved (understatement) so got to rethink.

72

Dom
M1KTA

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