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Recently, 2‐D photonic bandgap reflectors in microstrip technology have been proposed. Finite‐element 3‐D electromagnetic simulation shows negligible values of the fields outside the central row of the periodic pattern. This suggests the use of 1‐D patterns to reduce the transversal size of the reflectors. Simulations and measurements have been realized, giving very similar performance for both 1‐D and 2‐D structures. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 22: 411–412, 1999