The designed device is a directional coupler.
H-bend deviants directivity from what I expect
and this is what I mean from undesirable effects.
Design simulates in HFSS and by changing the radius
of bend, directivity alters.
In some radiuses can reach expected results but irrational thing
is that by increasing the radius of bend results do not approaches
to my expectations. Suppose results in r=15.4mm are ok but they're
not necessarily in r=20mm.
thank you for your time and attention.