Low-loss Z-type hexaferrite with Sr-substitution for microwave antenna miniaturization

Author

Xiang, C.C. ; Nie, Y. ; Feng, Z.K.

Author_Institution

Beijing Seven Star Flight Electron. Co. Ltd., Beijing, China

fYear

2011

fDate

1-3 Nov. 2011

Firstpage

71

Lastpage

74

Abstract

Magnetic and dielectric properties of conventional ceramics processed 3 Ba_(1-x)Sr_xO · 2 CoO · 10.4 Fe₂O₃ (x = 0.1 ~ 0.8) hexaferrite were investigated for microwave antenna miniaturization. Sr substitution was used to modulate the high frequency properties of Co₂Z materials in this paper. The properties of the materials were characterized by SEM, XRD, Vector Network Analyzer, and so on. All samples showed that Z-phase was the main phase with traces of M-phases and Y-phases and the resonance frequencies were all above 2GHz. 3 Ba_(1-x)Sr_xO · 2 CoO · 10.4 Fe₂O₃ samples sintered at 1050°C had a loss tanδ_μ = 0.05 with the permeability of 7.5 at 1GHz and the miniaturization factor n reached a value up to 11.2 under 2GHz. It was found that Co₂Z samples with Sr substitution showed a better low-loss property for microwave antenna application than Sr-free samples, which was benefit for microwave antenna miniaturization and performance improvement.

Keywords

X-ray diffraction; barium compounds; ceramics; cobalt compounds; dielectric properties; ferrites; microwave antennas; scanning electron microscopy; sintering; Ba_(1-x)Sr_xO; CoO; Fe₂O₃; SEM; XRD; Z-phase; ceramics; dielectric properties; frequency 1 GHz; high frequency properties; low-loss Z-type hexaferrite; magnetic properties; microwave antenna application; microwave antenna miniaturization; miniaturization factor; permeability; resonance frequencies; sintering; temperature 1050 C; vector network analyzer; Barium; Conductivity; Materials; Microwave antennas; Microwave theory and techniques; Permeability; Strontium; Co2Z; Sr-substitution; low loss; microstrip antenna miniaturization; microwave band;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave, Antenna, Propagation, and EMC Technologies for Wireless Communications (MAPE), 2011 IEEE 4th International Symposium on

Conference_Location

Beijing

Print_ISBN

978-1-4244-8265-8

Type

conf

DOI

10.1109/MAPE.2011.6156199

Filename

6156199