Open AccessWideband superconducting diplexer with stepped‐impedance cross‐structure
Author(s) -
Lu Xilong,
Guo Xubo,
Cao Bisong,
Wei Bin,
Zhang Xiaoping
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2014.1406
Subject(s) - diplexer , wideband , electrical impedance , coupling (piping) , materials science , superconductivity , channel (broadcasting) , optoelectronics , equivalent circuit , electronic engineering , acoustics , physics , electrical engineering , voltage , engineering , condensed matter physics , metallurgy
A stepped‐impedance cross‐structure (SICS), consisting of a centre rectangular patch loaded with two pairs of stubs, is proposed for the designing of a wideband superconducting diplexer. Each pair of the stubs is designed for one channel of the diplexer, and is coupled by the centre rectangular patch with a strong coupling property required by the wide bandwidths. The frequencies and the coupling strengths of the two pairs of the stubs can be controlled independently. A superconducting diplexer has been successfully designed and fabricated with the proposed structure. The two channels are centred at 2.9 and 5.8 GHz with fractional bandwidths of 26.9 and 24.5%. The measured results of the fabricated device show low insertion losses and high isolations and agree well with the simulated ones.