Microwave Ferrites : the Present and the Future

Voronkov, V.

doi:10.1051/jp4:1997104

Cited by 6 publications

(4 citation statements)

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“…In fact, by applying Ampère law to the magnetic circuit in Fig. 3, we obtain (9) The integration surface , in (9), is the rectangular plane corresponding to the closed path , and is the associated Stoke's normal. Since inside the perfect magnetic wires (path ), the magnetic voltage corresponding to cannot be zero, , and therefore, .…”

Section: B Mgtlmentioning

confidence: 99%

Theory of Magnetic Transmission Lines

Faria

Pires

2012

IEEE Trans. Microwave Theory Techn.

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This paper presents, for the first time, the frequencydomain theory of magnetic transmission lines, i.e., transmission lines where electromagnetic energy guidance is assured by means of two magnetic-flux carrying parallel magnetic wires, as opposed to the ordinary situation of two current carrying parallel electric wires (an electric transmission line). Propagation equations for the fundamental quasi-TEM mode are established and solved. Wave parameters are analyzed. A transmission matrix is described.

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Section: B Mgtlmentioning

confidence: 99%

Theory of Magnetic Transmission Lines

Faria

Pires

2012

IEEE Trans. Microwave Theory Techn.

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“…where γ is the gyromagnetic ratio (2.8 MHz/Oe) f is the center or operating frequency in (Hz) H a is an isotropic field in the range (0-100 Oe) BW is the operation bandwidth in (Hz) Ferrite materials on the market typically have a saturation magnetization in the range of 90-5000 gauss and a resonance line width from 0.5-2500 oersted. They can operate between 0.02 and 94 GHz [4]. If we assume that the ferrite disk is saturated in the Z -direction, the elements of the permeability tensor can be expressed in Cartesian coordinates as [8]:…”

Section: Unified Closed Form Solution a Microwave Ferrite Calculationmentioning

confidence: 99%

“…operation of a circulator relies on magnetized microwave ferrite [1], [2], a ceramic material with non-reciprocal behavior, meaning that its behavior in one direction is very different from that in the other direction [3], [4], [5]. A circulator is an important microwave device that has been used in wireless communication, radar, satellite payload, medical, military and defense applications, laboratory measurements and industrial microwave heating.…”

Section: Introductionmentioning

confidence: 99%

Design and Synthesis of Ferrite Strip-Line Circulator Based on Enhanced Closed Form Solution and Power Handling Analysis

Khim

Cheab²,

Soeung

et al. 2022

IEEE Access

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In this article, Y-junction strip-line circulators are designed using an enhanced closed form solution consisting of unified key equations and a flowchart design, which serves as a direct procedure for designing a ferrite circulator. This design methodology is combined with a 3D EM simulation that allows for the calculation of the saturation magnetization, uniform biasing, and ferrite dimensions needed for a circulator to operate in both modes. In addition, the closed form can be used to calculate the Y-junction parameters and allow the matching network to be calculated and the uniform circulator biasing design ended. Our analysis starts with the ferrite calculation to ensure that it is uniformly biased magnetically, and this is followed by strip-line design, Y-junction matching, and biasing circuit design. Using fullwave electromagnetic (EM), HFSS and magnetostatic (MS), Maxwell3D simulations, several key design parameters such as the saturation magnetization, coupling angle, and various external permanent magnetic biases are investigated. To validate the proposed concept, two strip-line circulators are designed and fabricated for operation in wide-bandwidth and narrow-bandwidth applications. Good agreement is found between the simulated and experimental responses for the S-parameters of the circulators. We also present a semi-analytical analysis of the concept of breakdown, which enables calculation of the peak power and total thermal rise in the strip-line structure. The average power handling capability of a strip-line circulator is studied for the first time. The proposed closed form expressions can also be implemented in various ferrite circulators using different guiding technologies for millimeter-wave applications.

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“…In preparation of microwave ferrite materials, particular attention should be given to the purity of the raw materials, stoichiometry of the composition and porosity as well as grain characteristics of the final product. Characteristics of various microwave ferrites have been minutely reported by Voronkov et al [5]. The emergence of Li ferrite as a competent material in microwave devices has resulted from some appropriate chemical substitutions made in it, which in turn result in low dielectric loss tangent, a low magnetic loss tangent at the operating bias field, a low coercive force and a large remanence ratio [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Influence of Composite Non Magnetic Ions (Cd-Ti) Doping on Structural and Electrical Properties of Li-Mn Ferrite

Deshmukh¹,

Jadhav²,

Patankar³

et al. 2012

NJGC

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The Li-Mn ferrites with composite divalent and tetravalent non-magnetic ions doping were prepared by ceramic method and studied for the first time to investigate their structural and electrical properties. It has been confirmed from the studies that these materials result in properties suitable for microwave applications. The structural properties have con- firmed the formation of cubic spinel ferrite and the substitutions of non magnetic ions have resulted in increase of unit cell dimensions and hence the grain size with increase in dopant content. An IR study asserts the same. Electrical Prop- erties show increase in dc resistivity and decrease in dielectric loss tangent with increase in dopant concentration

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Microwave Ferrites : the Present and the Future

Abstract: The state of the art of microwave ferrite technology in Russia is reviewed. The paper gives some generalization with respect to the future progress in the field, where the one of major tasks is likely to be a development of specialized gyromagnetics for mm-and sub-mm-range devices.

Cited by 6 publications

References 0 publications

Theory of Magnetic Transmission Lines

Theory of Magnetic Transmission Lines

Design and Synthesis of Ferrite Strip-Line Circulator Based on Enhanced Closed Form Solution and Power Handling Analysis

Influence of Composite Non Magnetic Ions (Cd-Ti) Doping on Structural and Electrical Properties of Li-Mn Ferrite

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