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The accuracy of an Eigenmode analysis for characterizing the propagation and attenuation behavior of periodic structures has been theoretically verified in  and . When combined with full-wave simulation, one can further completely and efficiently solve periodic multimode structures and devices. In this work, a set of virtual experiments is conducted to highlight the efficiency and versatility of both solvers in characterizing a set of basic microwave devices. This was demonstrated during the IMS2012 Student Design Competition. On the other hand, the quest to bridge the gap between optical and microwave frequencies has resulted in an unprecedented growth in millimeter-wave frequencies applications. This growth is paralleled by an increase in the complexity of circuit design, owed in part to the miniaturization and high-density integration that is typical of millimeter-wave frequency circuits. This complexity necessitates the concurrent use of diverse modeling and simulation techniques to enhance the accuracy of circuit characterization.