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

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/sub pp///spl mu/m and 127 mV/sub pp///spl mu/m and bandwidths of 80 MHz and 35 MHz were achieved for 50 /spl Omega/ and 1 k/spl Omega/ matching, respectively. The bandwidth was estimated to >100 MHz by adopting a sophisticated mounting technique and multisection /spl lambda//4 matching circuits.