Abstract
A technique for synthesizing asymmetrical coupled transmission lines with inhomogeneous dielectrics is proposed, which consists in choosing working physically based modal parameters from which the primary parameters – per-unit-length capacitance and inductance – are calculated. Three impedance parameters are taken as a basis (characteristic impedance, transformation and coupling coefficients), one of the modal voltages and a pair of modal dielectric constants. All selected for synthesis initial data have known ranges of acceptable values and a clear physical meaning. Previously little-studied features and interdependencies of parameters, including impedance and phase, were investigated. To demonstrate the technique capabilities, synthesized numerical values of the modal and distributed parameters of the original 3-dB hybrids are presented. The results can be useful in developing new coupled line designs and creating microwave devices with unique characteristics based on them.
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