抄録
This paper newly attempts to propose a method for compensating the mode-conversion by double negative (DNG) material for suppression of imbalance (common-mode) component and EMI generated by differential-paired lines with bend discontinuities, without the deterioration of the SI performance. The concept is based on compensation of phase-difference due to the bend discontinuities, by using DNG material with phase-constant β = 0 at a certain frequency. When the DNG material is located on discontinuity region asymmetrically, it was evaluated that CM component and the simulated |Scd21|, which is defined as the conversion from differential-mode (DM) to CM, can be compensated. The significant suppression effectiveness of |Scd21| in the case study is achieved by 13 dB around target frequency (100 MHz) using DNG material. Although DNG characteristics has not been established by real transmission line structure, the results validate the proof of concept and that proposed method should be one of the potential candidates of a basic method for suppressing mode-conversion due to phase-difference.
