The charge density distributions and mutual capacitance of a shielded twisted four-wire transmission line

In this paper, the authors characterize the capacitance of a shielded twisted four-wire transmission line structure. The procedure used was developed by C. James and J. Norgard for the characterization of the shielded twisted pair transmission line (see IEEE 1996 International Symposium on Electromagnetic Compatibility, Santa Clara, CA, USA, p.277-82). The characterization is based on the determination of the quasi-static charge density distributions on the conductor surfaces making up the shielded twisted four-wire transmission line. From the determined charges, the electric potential distribution and capacitances are found. The characterization of the four wire structure is significantly different from the pair because some of the symmetry of the pair is lost