New Synthetic Route of Z-Type (Ba$_{3}$Co$_{2}$Fe$_{24}$O$_{41}$) Hexaferrite Particles

Bae, Seok; Hong, Yang; Lee, J.J.; Jalli, Jeevan; Abo, Gavin S.; Lyle, A.; Nam, In-Tak; Seong, Won-Mo; Kum, Jun-Sig; Park, S.H.

doi:10.1109/tmag.2009.2018883

Cited by 30 publications

(17 citation statements)

References 6 publications

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“…The Co 2 Z powder was prepared by the one-step mixing and calcination process [3]. Borosilicate glass powder was mixed with 40h-shake-milled Co 2 Z powder.…”

Section: Methodsmentioning

confidence: 99%

“…Nonembedded radiator structure of ferrite antenna leads to better performance, while having the same volume of the embedded dielectric antenna. This is because the ferrite possesses both permeability and permittivity.Recently, the low loss Ba 3 Co 2 Fe 24 O 41 (Co 2 Z) has been developed [2,3] to miniaturize the VHF ferrite antenna [4]. To meet the GPS-BT dual-band frequencies, both magnetic and dielectric losses of the Co 2 Z are needed to be low enough up to 2.45 GHz of the BT frequency.…”

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confidence: 99%

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Dual‐band ferrite chip antenna for global positioning system and bluetooth applications

Bae

Hong

Lee

et al. 2010

Micro & Optical Tech Letters

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Figure 6 shows the measured radiation patterns including the co-polarization and cross-polarization in the H-plane (x-z plane) and E-plane (y-z plane). It can be seen that the radiation patterns in x-z plane are nearly omnidirectional for the three frequencies. CONCLUSIONSIn this article, a compact planar triangular monopole antenna is proposed that exhibits multioctave bandwidth performance and easily satisfies the requirements for UWB applications. The measured results show that the impedance bandwidth of the proposed antenna is significantly improved with the inclusion of square notches on the radiating patch, a narrow rectangular parasitic element located above the patch, and using a truncated ground-plane containing side slits. The measured results show good radiation patterns within the UWB frequency range. of the composite were in the range of 1.92-2.12 and 7.33-7.45, respectively, from 1.575 to 2.45 GHz. Magnetic and dielectric loss tan d of Co 2 Z-glass composite was <3.5% in the 1.5-3.0 GHz range. The 3D average gain and bandwidth of the 40h-shake-milled and sintered Co 2 Zglass composite antenna were À1.27 dB and 355 MHz at 1.575 GHz, À4.08 dB and 270 MHz at 2.45 GHz, respectively. Simulated Sparameter spectrum is in good agreement with experimental results. Key words: dual band antenna; ferrite chip antenna; GPS; bluetooth; hexaferrite INTRODUCTIONDual-band chip antenna was developed to work on both Global Positioning System (GPS; 1.575 GHz) and Bluetooth (BT; 2.45 GHz) for wireless handset. To miniaturize the dual band antenna to 100 mm 3 of the antenna volume, a radiator was embedded between two dielectric slabs. However, this embedded dielectric antenna shows low gain (GPS À2.6 dB, BT À2.4 dB) and narrow bandwidth (GPS 90 MHz, BT 130 MHz) [1]. However, the use of ferrite allows for achieving higher gain and broader bandwidth than the embedded dielectric antenna. Nonembedded radiator structure of ferrite antenna leads to better performance, while having the same volume of the embedded dielectric antenna. This is because the ferrite possesses both permeability and permittivity.Recently, the low loss Ba 3 Co 2 Fe 24 O 41 (Co 2 Z) has been developed [2,3] to miniaturize the VHF ferrite antenna [4]. To meet the GPS-BT dual-band frequencies, both magnetic and dielectric losses of the Co 2 Z are needed to be low enough up to 2.45 GHz of the BT frequency. Therefore, the Co 2 Z-glass composite was developed for use in the dual-band antenna. In this article, the dynamic properties of the developed low loss Co 2 Zglass composite and performance of the dual-band Co 2 Z-glass composite chip antenna are reported. EXPERIMENTALThe Co 2 Z-glass composite was used to fabricate the antenna substrate. The Co 2 Z powder was prepared by the one-step mixing and calcination process [3]. Borosilicate glass powder was mixed with 40h-shake-milled Co 2 Z powder. The ring shaped green bodies of the mixed powder were prepared by pressing with a steel mold and followed by sintering at 950 C for 1 h for dynamic magnetic characte...

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“…The Co 2 Z powder was prepared by the one-step mixing and calcination process [3]. Borosilicate glass powder was mixed with 40h-shake-milled Co 2 Z powder.…”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Dual‐band ferrite chip antenna for global positioning system and bluetooth applications

Bae

Hong

Lee

et al. 2010

Micro & Optical Tech Letters

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“…The detailed process is reported elsewhere [21,22]. Two different-sized Co 2 Z particles were prepared with and without 10-hour ball milling for the embedded-type ferrite inductor.…”

Section: Preparation Of High Crystalline-anisotropy Zn-co-ni Ferrite mentioning

confidence: 99%

Ferrite Magnetic-Anisotropy Field Effects on Inductance and Quality Factor of Planar GHZ Inductors

Lee¹,

Hong²,

Yun³

et al. 2016

PIER

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Abstract-Planar gigahertz (GHz) inductors were fabricated based on high crystalline-anisotropy Zn 0.13 Co 0.04 Ni 0.63 Fe 2.2 O 4 (Zn-Co-Ni ferrite) and Ba 3 Co 2 Fe 24 O 41 (Co 2 Z hexaferrite) and characterized for inductance (L) and quality (Q) factor. The planar ferrite inductors show an L of 4.5 nH (Zn-Co-Ni), 5.6 nH (Zn-Co-Ni + low H k and f FMR Co 2 Z:), and 4.8 nH (Zn-Co-Ni + high H k and f FMR Co 2 Z:) at 2 GHz. The corresponding L-densities are 18.0, 22.4, and 19.2 nH/mm 2 , which are greater than 16.8 nH/mm 2 of the air-core inductor. With respect to the Q factor, the air-core and ferrite inductors exhibit Q factors of 6.7 (air-core), 4.8 (Zn-Co-Ni), 2.8 (Zn-Co-Ni + low H k Co 2 Z), and 4.0 (Zn-Co-Ni + high H k Co 2 Z) at 2 GHz. The tan δ µ of the ferrites caused a reduction in the Q factor. Nevertheless, the high H k and f FMR Co 2 Z ferrite inductor demonstrates a higher Q factor than that of the low H k and f FMR Co 2 Z inductor. It is, therefore, suggested that high resistivity, anisotropy, magnetization ferrite can produce large L density and Q factor GHz inductors.

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“…Therefore, Z-type hexaferrite was used in this study for the substrate material of ferrite RPA. The one-step mixing and calcination process (MCP) [23] was used to synthesize the Z-type hexaferrite particles for fabrication of the ferrite ring and disk. The water-quenching process was included in the MCP to obtain high purity hexaferrite fine particles.…”

Section: Fabricationmentioning

confidence: 99%

“…The water-quenching process was included in the MCP to obtain high purity hexaferrite fine particles. This detailed process has been reported in [22,23]. The ferrite ring (Inner diameter: 3 mm, outer diameter: 7 mm) and disk (25 mm of radius, 7 mm of thickness) were prepared by sintering in O 2 at 950 • C for 1 h to obtain permeability and permittivity spectra.…”

Section: Fabricationmentioning

confidence: 99%

Miniature and Higher-Order Mode Ferrite Mimo Ring Patch Antenna for Mobile Communication System

Bae¹,

Hong

Lee³

et al. 2010

PIER B

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Abstract-Miniaturized ferrite ring patch antennas (RPAs) were designed and fabricated for multiple-input multiple-out (MIMO) applications. Design parameters of higher-order mode ferrite RPAs, 1-RPA and 2-RPA, were optimized, and antenna performance of the ferrite 1-RPA was evaluated. The Z-type hexaferrite and 2%-weight borosilicate glass composite was used for the ferrite antenna disk. The measured permeability (µ r ) and permittivity (ε r ) of the hexaferrite were 2.59 and 5.7, respectively, at 2.5 GHz. Three-mode orthogonal radiation of the ferrite 1-RPA was experimentally confirmed. With regard to the ferrite 2-RPA, excellent isolation (−40 dB) between ports 1 and 2 was achieved at 2.5 GHz. This excellent isolation property is attributed to both mode 3 orthogonal radiations of the bottom and top RPAs. The volumes of the 1-and 2-RPA were reduced to 14.5% and 34.5%, respectively, from 95 cm 3 of a dielectric 2-circular patch antenna (2-CPA) volume.

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New Synthetic Route of Z-Type (Ba$_{3}$Co$_{2}$Fe$_{24}$O$_{41}$) Hexaferrite Particles

Cited by 30 publications

References 6 publications

Dual‐band ferrite chip antenna for global positioning system and bluetooth applications

Dual‐band ferrite chip antenna for global positioning system and bluetooth applications

Ferrite Magnetic-Anisotropy Field Effects on Inductance and Quality Factor of Planar GHZ Inductors

Miniature and Higher-Order Mode Ferrite Mimo Ring Patch Antenna for Mobile Communication System

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