Design of a New Broad-Band Isolator

Konishi, Y.; Hoshino, N.

doi:10.1109/tmtt.1971.1127499

Cited by 23 publications

(4 citation statements)

References 3 publications

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“…By contrast, so-called lumped-element circulators can be very small compared to the electromagnetic wavelength, and they are analyzed using a circuit theory approach. Building on earlier work [124], [125], Miura et al [126] have recently described an improved method of optimizing circulators based on the lumped-element design.…”

Section: E Recent Developmentsmentioning

confidence: 99%

Ferrite devices and materials

Adam

Davis

Dionne

et al. 2002

IEEE Trans. Microwave Theory Techn.

642

224

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The development and current status of microwave ferrite technology is reviewed in this paper. An introduction to the physics and fundamentals of key ferrite devices is provided, followed by a historical account of the development of ferrimagnetic spinel and garnet (YIG) materials. Key ferrite components, i.e., circulators and isolators, phase shifters, tunable filters, and nonlinear devices are also discussed separately.

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Section: E Recent Developmentsmentioning

confidence: 99%

Ferrite devices and materials

Adam

Davis

Dionne

et al. 2002

IEEE Trans. Microwave Theory Techn.

642

224

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“…2. In general, the bandwidth is increased more with the increasing of the total number n of all resonance circuits [11][12][13]. However, it has been seen that the improvement in bandwidth is much less remarkable for n larger than 2 or 3.…”

Section: Impedance Matching Techniquementioning

confidence: 98%

Temperature Compensation of VHF-band Lumped-Element Ferrite Circulator for Wireless Communication Application

Che¹,

Yung²

2005

Journal of Electromagnetic Waves and Applications

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The design of a VHF-band lumped-element ferrite circulator has been introduced. The experiments have indicated that the ferrite circulator has good performances in the room temperature. However, when the ambient temperature has changed, the significant degradations of performances of the ferrite circulator have been observed. A temperature-compensation technique has been adopted to guarantee the good performances of the ferrite circulator, in which one kind of special alloy has been employed and an experimental prototype has been constructed. The measured data have shown that, excellent performances can be obtained in the frequency range 140-180 MHz and over 20 dB isolation has been guaranteed throughout the temperature range of 0 • C∼ 70 • C.

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“…The ideas mentioned herein are very useful for VHF circulators which are Aensi-8. Conclusions (1) The relationships between 4xMs of garnets and performances of circulators are derived from the fundamental equations of the lamped-element circulator in the VHF region.…”

Section: On Plate Casementioning

confidence: 99%

Temperature‐stabilization of lumped‐element circulator in VHF region

Takeda

Kawashima

1986

Electron. Comm. Jpn. Pt. I

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Performances of VHF lumped‐element circulators change sensitively by slight changes of 4πMs of garnets with temperature. Single‐tuned 100‐MHz circulators are studied. One experiment is to measure changes of external fields under the constant frequency condition with temperature; another experiment is carried out under the constant impedance condition. The former agrees well with theoretical predictions; the latter shows poor agreement. The parabolic compensation, which is the addition of several kinds of compensator alloys to magnetic circuits in parallel or in series depending upon the convex‐shape temperature characteristics of 4πMs, is very useful.

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Design of a New Broad-Band Isolator

Cited by 23 publications

References 3 publications

Ferrite devices and materials

Ferrite devices and materials

Temperature Compensation of VHF-band Lumped-Element Ferrite Circulator for Wireless Communication Application

Temperature‐stabilization of lumped‐element circulator in VHF region

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