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J Electromagn Eng Sci > Volume 15(4); 2015 > Article
Journal of Electromagnetic Engineering and Science 2015;15(4):258-265.
DOI: https://doi.org/10.5515/JKIEES.2015.15.4.258   
A De-Embedding Technique of a Three-Port Network with Two Ports Coupled
Bo Pu1, Jonghyeon Kim2, Wansoo Nah3
1System LSI Business, Samsung Electronics
2Hyundai MOBIS
3School of Electrical and Electronic Engineering, Sungkyunkwan University
Abstract
A de-embedding method for multiport networks, especially for coupled odd interconnection lines, is presented in this paper. This method does not require a conversion from S-parameters to T-parameters, which is widely used in the de-embedding technique of multiport networks based on cascaded simple two-port relations, whereas here, we apply an operation to the S-matrix to generate all the uncoupled and coupled coefficients. The derivation of the method is based on the relations of incident and reflected waves between the input of the entire network and the input of the intrinsic device under test (DUT). The characteristics of the intrinsic DUT are eventually achieved and expressed as a function of the S-parameters of the whole network, which are easily obtained. The derived coefficients constitute ABCD-parameters for a convenient implementation of the method into cascaded multiport networks. A validation was performed based on a spice-like circuit simulator, and this verified the proposed method for both uncoupled and coupled cases.
Key words: Coupled Lines, De-Embedding Method, Multiport Network, Odd Number Ports
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