Fig. 1. (a) 2D PCs defect structure; (b) 2D square lattice PCW in a transparent shell; (c) schematic diagram of the PCW; (d) PBG of the 2D square lattice PCs.

Fig. 2. (a) Ez field distribution in the PCW; (b) the amplitude of the Ez field; (c) and (d) the distribution of power in the PCs at the normalized frequency of $0.28(2\pi c/a)$; (e) and (f) the distribution of power in the PCW at the central frequency of $0.4016(2\pi c/a)$; (g) and (h) the distribution of power in the PCs at the central frequency of $0.52(2\pi c/a)$.

Fig. 3. (a) Sectional view of the PCs sample; (b) experimental setup for measuring the PBG of the PCs.

Fig. 4. (a) Logarithmic value of the reflection efficiency of Port A; (b) the isolation ${\tau }_{BA}$ of Ports B to A; (c) the isolation ${\tau }_{AB}$ of Ports A to B; (d) the logarithmic value of the reflection efficiency of Port B.

Fig. 5. (a) Sectional view of the PCW sample; (b) experimental setup for measuring the transmission efficiency between Port A and Port C; (c) experimental setup for measuring the transmission efficiency between Port A and Port D.

Fig. 6. Logarithmic value of the transmission efficiency between Port A and Port C: (a) $S_{21}$ and (b) $S_{12}$; Logarithmic value of the transmission efficiency between Port A and Port D: (c) $S_{21}$ and (d) $S_{12}$.

Table 1. Comparison Between Experimental and Numerical Results