This work presents a comprehensive full-wave simulation study of a conventional transmission line, its equivalent
symmetric T-structure, and a coupled transmission line using the MATLAB RF PCB Toolbox. The performance
of each structure is analysed and compared with the desired theoretical results. For the conventional transmission
line, it is observed that while single-band operation performs well, dual-band or multi-band configurations suffer from
increased radiation and conduction losses, limiting their practical utility. To address this, an equivalent symmetric
T-structure is designed, and its behaviour under single-band and dual-band operation is investigated. The T-structure
exhibits excellent agreement with the conventional transmission line in the single-band regime and provides acceptable
trade-off performance for dual-band operation, thereby validating its equivalency. Additionally, the coupled trans-
mission line is simulated for coupling coefficients (-13 dB, and -40 dB) on a substrate with a dielectric constant of
4.4. The behaviour of the coupled transmission line is analysed both with and without accounting for the even- and
odd-mode electrical lengths. It is observed that significant ambiguities arise when the electrical lengths in both modes
are assumed to be constant. Therefore, this assumption cannot be considered reliable under strong coupling conditions.
The results offer valuable insight into the electrical behaviour and practical viability of these transmission line structures
across various configurations.