Computation and measurement of microwave metallic photonic crystal point-defect-cavity

By changing the radius of the rod in the center of a point-defect-cavity (PDC) based on metallic photonic crystals (M-PhCs), a novel type of microwave cavity with an adjustable resonant-frequency is proposed and studied. After the illustration of the band structure of M-PhCs, the first 3 resonant modes of the point-defect-cavity (PDC) are computed by supper-cell methods, whereas the relation between the convergence of calculated resonant frequencies of PDC and the number of rods considered in a single cell is focused. Moreover, a PDC is then fabricated and experimentally measured. The measured resonant frequencies and Q-factors, reported at the first time, are compared to the calculated ones to validate our computation and show its properties. Finally, a PDC-based filter is designed to show its potential applications in microwave regime.