Patent ID: 6178339
Filing Date: 2001-01-23
Classification: H01P,Y10S

Abstract:
A low temperature operating transmitting filter apparatus having a filter element, comprising:a plurality of filter coupling line blocks each of which is composed of a filter electrode of a superconductive thin film and a thin film coupling line, the respective thin film coupling line having a length of (2m+1).lambda./4, wherein m is 0 or a natural number and .lambda. is a signal wavelength, the respective thin film coupling line being connected to an output end of the corresponding filter electrode; andat least one output coupling line having the same characteristic impedance as that of the respective thin film coupling line, which is connected to an end of the respective thin film coupling line on an opposite side of the corresponding filter electrode;wherein a number of the at least one output coupling line is smaller than a number of the thin film coupling lines.