Abstract
AbstractA novel dielectric waveguide directional coupler with a double‐negative slab lies in the coupling region is analyzed by the staircase approximation method, which combines the building block approach and multimode network theory with a rigorous mode‐matching procedure. Particular attention is directed toward the coupling characteristics under different structural and constitutive parameters of the coupler. Numerical results indicate that the transition and coupling length of the proposed coupler is only 70% and 42% of related lengths in the conventional coupler, respectively. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1545–1548, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22491
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