Extremely high output of UHF carrier type head with impedance matching network

Author

Senda, Masakatsu ; Takei, Koji ; Ishii, Osamu ; Koshimoto, Yasuhiro

Author_Institution

NTT Interdisciplinary Res. Labs., Tokai, Japan

Volume

32

Issue

5

fYear

1996

fDate

9/1/1996 12:00:00 AM

Firstpage

3485

Lastpage

3487

Abstract

The output characteristics were examined for a new type of thin-film head employing a permeability change at UHF. Impedance matching was selected as the optimum technique for connecting the head with other circuits. A high output can be obtained even for a narrow track head because of its large voltage change ratio, a lossless signal transmission, and a boosting effect. Outputs of 20.5 mVV_pp/μm and 127 mV_pp/μm and bandwidths of 80 MHz and 35 MHz were achieved for 50 Ω and 1 kΩ matching, respectively. The bandwidth was estimated to >100 MHz by adopting a sophisticated mounting technique and multisection λ/4 matching circuits

Keywords

UHF devices; impedance matching; magnetic heads; magnetic thin film devices; 1 kohm; 35 MHz; 50 ohm; 80 MHz; UHF carrier type head; bandwidth; boosting effect; impedance matching network; lossless signal transmission; mounting technique; multisection quarter wavelength matching circuit; narrow track head; output characteristics; permeability; thin-film head; voltage change ratio; Circuits; Frequency; Impedance matching; Magnetic cores; Magnetic films; Magnetic heads; Magnetostriction; Permeability; Saturation magnetization; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.538665

Filename

538665