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Circulator with coplanar waveguide structure
Author(s) -
Yamamoto Setsuo,
Shitamitsu Keiko,
Kurisu Hiroki,
Matsuura Mitsuru,
Oshiro Kazunori,
Mikami Hideto,
Fujii Shigeo
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200304536
Subject(s) - circulator , coplanar waveguide , ferrite (magnet) , return loss , materials science , microwave , insertion loss , transmission line , fractional bandwidth , transmission loss , optoelectronics , magnetization , electrical engineering , magnetic field , optics , physics , telecommunications , engineering , composite material , quantum mechanics , resonator , antenna (radio)
Abstract A small size circulator with a coplanar waveguide structure was designed and its transmission characteristics were analyzed using a high frequency electromagnetic simulation based on 3D FEM. The circulator consisted of a YIG ferrite substrate and a transmission line and a ground. When a YIG ferrite substrate with a saturation magnetization of 90 mT was used and a magnetic bias field of 64 kA/m was applied, the circulator operates at 6.98 GHz with an insertion loss | S 21 | of 1.06 dB, an isolation | S 31 | of 32.90 dB, a return loss | S 11 | of 29.89 dB, and a bandwidth (at 20 dB) of 43 MHz. The nonreciprocal transmission characteristics are achieved skillfully utilizing the wavy non‐uniform distribution of microwave. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)