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(a) Two cells of a compound grating having three slits per period of length . The structure is electrically large along and directions. (b) Equivalent transmission line circuit following Refs. 9 and 15.
Microstrip circuit that mimics compound gratings having five or six slits per period. For three or four slits per period one of the floating patches embedded in the substrate should be removed.
Measured (black lines) of the microstrip circuit analog with one/two patches corresponding to compound 1D gratings with three(four)/five(six) slits per period. Power loss is included (dashed gray lines). One dip per Fabry–Pérot resonance is found in the first case and two dips appear in the second case. Absorption peaks are found at the resonances. Parameters of the structure in Fig. 2: , , , , , , and .
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