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Properties and Applications of Asymmetric Coupled Line Structures in an Inhomogeneous Medium

The properties and applications of asymmetric uniformly coupled line structures in an inhomogeneous medium (e.g., microstrip, suspended substrate and broad side-coupled strips in a layered medium) are presented in terms of the self and mutual line constants characterizing the coupled lines. The structures are investigated in terms of the immittance and ABCD parameters derived for two port and multiport structures. These structures are useful for many applications including filters, directional couplers and impedance matching networks.