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Performance of stripline‐type ferrite coupled line circulators
Author(s) -
Queck C. K.,
Davis L. E.,
Xie K.,
Newsome K.,
Climer B.,
Priestley N. E.
Publication year - 2003
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.10075
Subject(s) - circulator , stripline , ferrite (magnet) , insertion loss , microwave , materials science , optoelectronics , return loss , electrical engineering , fractional bandwidth , engineering , telecommunications , resonator , antenna (radio)
The normal‐mode approach is used to design stripline‐type ferrite coupled line circulators with alumina as a substrate and ferrite as a superstrate. The measurements that are taken clearly demonstrate the nonreciprocal behavior of these devices, with an average insertion loss of 5 dB and an isolation of −12 dB. It is found that the three‐port circulator has a broader bandwidth (9–14 GHz) than that of the four‐port circulator (9–12 GHz), and the hybrid coupler has been identified as the bottleneck in the latter. © 2003 Wiley Periodicals, Inc. Int J RF and Microwave CAE 13: 173–179, 2003.