Predicting Probable Cavity Resonance with a 3D EM Tool

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  • Author: Yeap Yean Wei, Frank Demming-Janssen, and Linus Lau Ngie Ung
Cavity resonance is commonly encountered when the PCBs and RF components are placed in an enclosure. Due to the module height and the housing structure, the standing wave with characteristic such that the E and H fields are 90° out of phase with each other. The impedance will therefore fluctuate wildly across the cavity causing unknown effects on circuitry, including the introduction of instability to active devices.
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