An application of a hexagonal ferrite to a millimeter-wave Y circulator

Akaiwa, Yoshihiko; Okazaki, Toshiya

doi:10.1109/tmag.1974.1058336

Cited by 55 publications

(19 citation statements)

References 6 publications

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“…However, to realize self-bias operation of a ferrite circulator, the ferrite corevicity (H c ) must be greater than demagnetization field given in Eq. (8) [13], .…”

Section: Fabrication Of Ferrite Circulator and Measurementmentioning

confidence: 99%

Magnetic Parameters for Ultra-high Frequency (UHF) Ferrite Circulator Design

Lee¹,

Hong²,

Yun³

et al. 2014

Journal of Magnetics

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We designed an ultra-high frequency (UHF: 300 MHz to 3 GHz) ferrite circulator to investigate magnetic parameters, which are suitable for a self-biased GHz circulator design. The size of the ferrite disk was 1.58 mm in thickness and 13.5 mm in diameter. The saturation magnetization (4πM s ) of 3900 Gauss, internal magnetic field (H in ) of 1 kOe, and ferromagnetic linewidth (ΔH) of 354 Oe were used in circulator performance simulation. The simulation results show the isolation of 36.4 dB and insertion loss of 2.76 dB at 2.6 GHz and were compared to measured results. A Ni-Zn ferrite circulator was fabricated based on the above design parameters. An out-of-plane DC magnetic field (H 0 ) of 4.8 kOe was applied to the fabricated circulator to measure isolation, insertion loss, and bandwidth. Experimental magnetic parameters for the ferrite were H in of about 1.33 kOe and 4πM s of 3935 Gauss. The isolation 43.9 dB and insertion loss of 5.6 dB measured at 2.5 GHz are in close agreement with the simulated results of the designed ferrite circulator. Based on the simulated and experimental results, we demonstrate that the following magnetic parameters are suitable for 2 GHz self-biased circulator design: 4πM r of 3900 Gauss, H a of 4.5 kOe, H c greater than 3.4 kOe, and ΔH of 50 Oe.

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“…However, to realize self-bias operation of a ferrite circulator, the ferrite corevicity (H c ) must be greater than demagnetization field given in Eq. (8) [13], .…”

Section: Fabrication Of Ferrite Circulator and Measurementmentioning

confidence: 99%

Magnetic Parameters for Ultra-high Frequency (UHF) Ferrite Circulator Design

Lee¹,

Hong²,

Yun³

et al. 2014

Journal of Magnetics

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“…Conventionally processed bulk BaM usually exhibits large Ka band FMR linewidths of 700 to 2000Oe, which essentially hinders the realization of practical devices. 10,11 In 2009, crystallographycally textured hexaferrites with FMR linewidths of 1500Oe and 400Oe were used to design and fabricate millimeter-wave self-biased circulators. The measurements demonstrated that the insertion loss (IL) of the two circulators was -1.88dB (@42.2GHz) and -0.87dB (@41GHz) respectively.…”

Section: Introductionmentioning

confidence: 99%

Tailoring magnetic properties of self-biased hexaferrites using an alternative copolymer of isobutylene and maleic anhydride

Zhong

Соколов

et al. 2018

AIP Advances

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Discussed is a novel self-biased hexaferrite gelling system based on a nontoxic and water-soluble copolymer of isobutylene and maleic anhydride. This copolymer simultaneously acts as a dispersant and gelling agent, and recently received much attention from the ceramics community. Herein its effects on the rheological conditions throughout magnetic-field pressing, and consequently, orientation, density and magnetic properties of textured hexaferrites were investigated. Ka-band FMR linewidths were measured, and the crystalline anisotropy and porosity induced linewidth broadening were estimated according to Schlömann’s theory. The copolymer allowed to reduce the friction between micron-sized magnetic particulates, resulting in higher density and degree of crystalline orientation, and lower FMR linewidth.

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“…For the last of these, barium ferrite-based compounds are irreplaceable [5]. Due to their high magnetocrystalline anisotropy, they exhibit a ferromagnetic resonance at mm-wavelengths, while, at the same time, they are magnetically self-biased.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterisation of magnetically ordered columnar structures of barium ferrite particles

Kolev

Lisjak

Drofenik

2011

Journal of Experimental Nanoscience

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In this study, we report on the columnar structures of barium ferrite particles that were prepared from water suspensions by applying a magnetic field during drying. Commercial barium ferrite (BaFe 12 O 19 ) monodomain particles were used, and the surfaces of the particles were treated with an organic surfactant to reduce their agglomeration. The columnar structures were obtained by drying the water suspensions of BaFe 12 O 19 particles on Al 2 O 3 substrates under an applied magnetic field of 1 T. After the degradation of the organic components, the samples were sintered at 1350 C. X-ray powder diffraction, scanning electron microscopy and magnetic measurements were used to characterise the samples. When the magnetic field was applied perpendicularly to the sample plane, the as-deposited sample exhibited a higher coercivity (H c ¼ 5434 Oe) and a higher squareness ratio (SQR ¼ 0.76) than the sintered sample (H c ¼ 625 Oe, SQR ¼ 0.58). However, the sintered sample showed a higher anisotropy of the magnetic behaviour than the as-deposited sample.

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An application of a hexagonal ferrite to a millimeter-wave Y circulator

Cited by 55 publications

References 6 publications

Magnetic Parameters for Ultra-high Frequency (UHF) Ferrite Circulator Design

Magnetic Parameters for Ultra-high Frequency (UHF) Ferrite Circulator Design

Tailoring magnetic properties of self-biased hexaferrites using an alternative copolymer of isobutylene and maleic anhydride

Preparation and characterisation of magnetically ordered columnar structures of barium ferrite particles

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