INFLUENCE OF THE CONTROL SIGNAL INPUT IN PINHOLE DEVICE

The modulation of the output signal from a thin film transformer was studied. The changes in reflection and transmission coefficients for the thin film transformer were observed by the application of the local magnetic field using a control current. The reflection coefficient changed drastically. However, the change of the transmission coefficient was small. The effect from the control pinhole adjacent to the input strip line were larger than those observed from other control pinholes. Two types of the thin film transformer with two control pinholes were prepared. The local magnetic field near the input and output pinholes can be adjusted by the polarity and intensity of the control current. It was certified that the characteristics of the thin film transformer were controllable by a local magnetic field.