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How to Compute Radiating Near-Fields in Comsol Multiphysics via Stratton-Chu Aperture Integration

Robert Koslover, SARA, Inc.
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Note: This is a re-posting of previous work, accidentally deleted from the Model Exchange.
SUMMARY: The finite-element (FE)-based RF module in Comsol Multiphysics supports direct full-wave 3D computation of RF fields local to antennas and structures. It also provides computation of far-field patterns (via post-processing) via an included far-field formulation of the Stratton-Chu aperture integration method. However, there exist important cases where field points of interest are far enough away from antennas or other structures so as to make direct application of FE-based methods very cumbersome, yet not so far away as to ensure validity of alternative far-field approximations. In such cases, it is valuable to employ a Near-Field version of the Stratton-Chu method. This is a more general expression than the far-field-only version implemented by Comsol. We describe a way for users to implement this method themselves by defining certain new variables and component couplings. The essential expressions that we provide can be copied and pasted directly, for convenience.

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