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How can high cross-polarization be addressed in CST antenna simulations?

During CST simulations of planar and array antennas, I often observe elevated cross-polarization levels that exceed expected values. I want to identify the primary causes in simulation—geometry, feed, or meshing—and learn strategies to reduce cross-polarization for more accurate radiation pattern predictions.

 

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By Jenny Answered 1 year ago


From my experience with CST simulations, I have seen high cross-polarization often stem from subtle geometric asymmetries, imperfect feed placement, or coarse meshing that inaccurately captures field distributions. I would recommend first checking symmetry and alignment of the radiating elements and ensuring the feed is correctly modeled. Refining the mesh, especially around edges and slots, often reduces numerical artifacts contributing to cross-polarization. Additionally, verify boundary conditions and port excitations, as improper assignments can introduce unwanted orthogonal components. In practice, iterative refinement—combining geometry, meshing, and feed optimization—typically yields the most significant reduction in simulated cross-polarization levels.
 
 
 

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