Open AccessModal response analysis of non‐uniform and asymmetric DL under plane‐wave illumination
Author(s) -
Yang Jinpeng,
Sun Xiaoying,
Zhao Yu,
Chen Jian,
Sun Tiegang
Publication year - 2019
Publication title -
iet science, measurement and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.418
H-Index - 49
eISSN - 1751-8830
pISSN - 1751-8822
DOI - 10.1049/iet-smt.2018.5177
Subject(s) - modal , asymmetry , perturbation (astronomy) , physics , mathematical analysis , modal analysis , waveform , ground plane , electrical impedance , mathematics , optics , acoustics , voltage , materials science , engineering , telecommunications , quantum mechanics , polymer chemistry , antenna (radio) , vibration
In this study, the mode‐generation mechanism due to non‐uniformity and asymmetry in a differential line (DL) circuit illuminated by a plane wave was analysed using a modal perturbation technique. Through modal decomposition, the field‐to‐line coupling equation was reformulated in terms of a differential mode (DM) and common mode, and the perturbation technique was applied, interpreting the geometrical unbalance as the mathematical equivalent modal distributed sources. Three types of typical DL structures above a loss ground with different conductivities in the frequency and time domains are discussed. The results show that the non‐uniformity of a DL will cause mode perturbation, while asymmetry can lead to mode conversion. The time‐domain results show that under plane‐wave illumination, the DM response of an asymmetric non‐uniform DL (NDL) increases significantly compared with that of a symmetric NDL and uniform DL. With the decrease in ground conductivity, the distortion of the modal response waveform is aggravated and extended with time.