Discussion
Why do the struts supporting a feed raise the side lobes as well as reducing gain?
Answer: A
A strut in the aperture intercepts and re-radiates energy in a pattern of its own, typically producing a set of lobes along the plane of the strut, which is why struts are often shaped or tilted to direct that scattering harmlessly. Mechanical deflection is a separate concern addressed by structural design, the struts are not resonant elements, and the shadow they cast is the blockage rather than the scattering. Both effects arise from the same obstruction but they are counted separately in an efficiency budget.
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