Impedance Matching of Electrically Small Antenna with Ni-Zn Ferrite Film

被引：6

作者：

Lee, Jaejin

Hong, Yang-Ki ^{[1
]}

Lee, Woncheol

Park, Jihoon

机构：

[1] Univ Alabama, Dept Elect & Comp Engn, Tuscaloosa, AL 35487 USA

来源：

JOURNAL OF MAGNETICS | 2013年 / 18卷 / 04期

关键词：

electrophoresis deposition; Ni-Zn ferrite film; impedance matching; electrically small antenna; Co(2)Z hexaferrite; THIN-FILMS; PERMITTIVITY; PERMEABILITY; TEMPERATURE;

D O I：

10.4283/JMAG.2013.18.4.428

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We demonstrate that a partial loading of Ni0.5Zn0.5Fe2O4 (Ni-Zn ferrite) film remarkably improves impedance matching of electrically small Ba3Co2Fe24O41 (CO(2)Z) hexaferrite antenna. A 3 mu m thick Ni-Zn ferrite film was deposited on a silicon wafer by the electrophoresis deposition process and post-annealed at 400 degrees C. The fabricated Ni-Zn ferrite film has saturation magnetization of 268 emu/cm(3) and coercivity of 89 Oe. A partial loading of the Ni-Zn ferrite film on the Co(2)Z hexaferrite helical antenna increases antenna return loss to 24.7 dB from 9.0 dB of the Co(2)Z antenna. Experimental results show that impedance matching and maximum input power transmission to the antenna without additional matching elements can be realized, while keeping almost the same size as the Co(2)Z antenna size.

引用

页码：428 / 431

页数：4

共 16 条

[1]

Bae S., 2008, J APPL PHYS, V103

[2] Miniaturized Broadband Ferrite T-DMB Antenna for Mobile-Phone Applications [J].