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A photonic crystal fence (PCF) is proposed for noise isolation with minimum use of high dielectric constant (DK) rods material. Only three rows of periodic high-DK rods are used in the PCF, but broadband and high efficient noise suppression are retained. It will be shown that a 45° rotated square lattice represents a good compromise in terms of both high-DK material reduction (cost reduction) and noise suppression performance. A design flow for choosing the high-DK rod radius, pitch, and dielectric constant for the PCF is also demonstrated.