NDLI: Study of a Ferrite LTCC Multifunctional Circulator With Integrated Winding

Content Provider	IEEE Xplore Digital Library
Author	Shicheng Yang Vincent, D. Bray, J.R. Roy, L.
Copyright Year	2011
Abstract	This paper shows a study of a new ferrite low-temperature cofired ceramic (LTCC) circulator with integrated winding. The external magnets used in traditional circulators must be strong to overcome the ferrite's demagnetization factor. The novel circulator presented herein uses an embedded winding within the ferrite to magnetize the material from the inside, thereby significantly reducing the demagnetization effects. Because of the controllability of the bias field, the resulting device is also multifunctional: when the windings are energized by a current, the device operates as a dynamic circulator in which the circulation direction can be changed by switching the direction of the current. If an external magnet is placed on the circulator, its operating frequency can be changed by adjusting the bias current. Unlike other LTCC circulators with external magnets, the proposed device can even operate as a power splitter by removing the bias current. A circulator prototype has been characterized in three states: unbiased, biased by windings, and biased by windings and external magnets. When no current is applied, the transmission of each port is about -5 dB with a return loss better than 20 dB at 14.8 GHz. When a current of 300 mA is injected into the windings, the measured insertion loss and isolation of the circulator are approximately 3 and 8 dB, respectively, whereas the return loss is better than 20 dB at 14.2 GHz. When external magnets are added in addition to a current of 200 mA, the insertion loss and isolation improve to 1.6 and 23 dB, respectively, at 14.2 GHz. The variation of the circulator's working frequency is 0.6 GHz. This is achieved first by the change of internal magnetization M when current is less than 120 mA, then the heat due to the winding increases the ferrite's μeff, leading to more frequency shifting. The total size(L×W×H)is8mm×8mm×1.1mm.
Starting Page	879
Ending Page	886
Page Count	8
File Size	4313819
File Format	PDF
ISSN	21563950
Volume Number	5
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Circulators Ferrites Windings Saturation magnetization Magnetic cores Magnetostatics Coils tunable circulator. Edge-guided circulator embedded windings ferrite low-temperature cofired ceramic (LTCC) tunable circulator
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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