Abstract
Discrimination of a higher order TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">02</sub> mode in a rectangular patch by minimally tampering its boundary condition has been addressed based on some insightful studies. The magnetic wall across each nonradiating edge has been transformed into a composite boundary and unlike the earlier designs, this mechanism has been successfully demonstrated in eliminating the cross-polarized (XP) fields without causing any harm to the primary resonance. The signature of modal discrimination has been experimentally evidenced in the X-band by reducing the H-plane XP level consistently over the full range of elevation angle varying over 15-18 dB. Such “full-elevation” feature is highly significant from practical aspect and not commonly achievable in the other known methods. The proposed technique is directly integratable with a practical system without imposing any constraint on its deployment platform.
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