Several narrowband matching networks for quasi-TEM coupled microstrip lines

For multiconductor transmission line (MTL) systems, “matching” occurs in the context of multiple propagating modes and requires minimization of the reflection coefficient matrix function, one of the governing MTL longitudinal immittance matrix functions (LIMFs). This paper presents the synthesis of several matching strategies (stubs, reactances, transformers) for symmetric, coupled-line microstrip structures mismatched with several simple passive terminations. Optimization of matching network parameters yields significant reflection reduction resulting from the termination mismatches. Measurement of synthesized structures verifies the reflection reduction and power savings. General n-coupled line applications include coupled-microstrip transistor amplifiers, optoelectronics packaging, chip- and package-level interconnections, and parallel data buses