Open AccessImproved method of reactive loading for miniaturisation of transmission lines with minimal degradation in performance
Author(s) -
Lim Taejun,
Lee Seungku,
Lee Yongshik
Publication year - 2015
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2014.0547
Subject(s) - chebyshev filter , electronic engineering , electronic circuit , electrical impedance , electric power transmission , transformer , transmission line , reduction (mathematics) , degradation (telecommunications) , materials science , engineering , electrical engineering , voltage , mathematics , geometry
This study presents an improved method of constant reactive loading for the miniaturisation of quarter‐wavelength transmission lines. The method provides an optimum location for loading, which maintains the electrical characteristics before and after miniaturisation. Therefore circuits based on transmission lines can be miniaturised with negligible deterioration in performance. This simple yet highly effective method is especially attractive for popular multi‐section circuits, in which a number of sections are cascaded for wider bandwidths. Experimental results of various Chebyshev multi‐section impedance transformers not only verifies the effectiveness of this method in bandwidths as large as 99% with a size reduction of more than 55%, but also demonstrates the method's flexibility of design.