The Chain Scattering Parameters for Symmetric Coupled Three-line in Inhomogeneous Medium

Using a novel approach, the analytic expressions of the chain scattering parameters (T-parameters) for the symmetric coupled three-line in inhomogeneous medium (SCTLIM) are derived in this paper for the first time. The expressions of the chain scattering parameters (T-parameters) for the SCTLIM expressed by normal mode parameters are given. The expressions of the T-parameters are explicit in form and clear in the conception. Using the matrix operation, the T-parameters expressions of the SCTLIM under the lossless condition have been confirmed by results of the S-matrix presented in the reference. It is also showed that the novel method presented in this paper is very effective. The T-parameters of the SCTLIM given in this paper will provide powerful theoretical tool for the application of the SCTLIM in the microwave integrated circuits and three dimensional (multilayer) microwave integrated circuits.