Open AccessCompact paper‐substrate rat‐race coupler deploying modified stepped impedance stub and interdigitated slot resonator for wide‐band harmonic suppression
Author(s) -
Velan Sangeetha,
Kanagasabai Malathi,
Pakkathillam Jayaram Kizhekke,
Palaniswamy Sandeep Kumar
Publication year - 2016
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.2016.0057
Subject(s) - resonator , stub (electronics) , rat race coupler , materials science , electrical impedance , optoelectronics , acoustics , electrical engineering , hybrid coupler , engineering , physics , power dividers and directional couplers
This study presents the design of a flexible compact rat‐race coupler operating at 0.72 GHz on a 1 mm thick paper substrate. The ultra‐wide stop‐band effect caused due to the combination of the modified stepped impedance stub and the interdigitated resonator slot, offers suppression up to the 14th harmonic. The slow‐wave effect caused due to the resonator slot leads to 59.6% size reduction compared with the conventional coupler at the design frequency. The signal transmission through the coupler for different substrate deformation steps has been investigated. Stable responses are reported for the same, making the prototype suitable for flexible electronics applications.