Abstract
AbstractDesign of directional couplers in an inhomogeneous suspended stripline dielectric structure has been comprehensively investigated. A new design procedure of coupled‐line directional couplers has been proposed in which the equalization of inductive and capacitive coupling coefficients is achieved simultaneously with matching to the desired characteristic impedance and, therefore, the conditions of ideal coupler realization can be approached. To achieve that, a method of modification of the capacitive coupling coefficient in which shunt capacitances are added to coupled lines has been used. The proposed design procedure has been successfully applied to the design of a 3‐dB directional coupler. Results of both calculations and measurements are presented. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 315–319, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24035
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