Title :
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
fDate :
9/1/1996 12:00:00 AM
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 mVVpp/μm and 127 mVpp/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;
Journal_Title :
Magnetics, IEEE Transactions on
