| 摘要 |
PURPOSE:To extract only a desired signal without causing the reflection of a disturbing signal to a signal source and the radiation of the disturbing signal into space by decomposing a desired signal and the disturbing signal by means of a directional filter and using a resistor so as to terminate the disturbing signal. CONSTITUTION:Since the line length of a resonator 12 is made equal to the wavelength of the disturbing signal, when a desired signal including the disturbing signal is inputted to an input terminal 13a of an input line 13, the disturbing signal is outputted to a signal output terminal 14a of an output line 14. Since the desired signal is outputted at an output terminal 13b of the input line 13, the reflection of the disturbing signal to the signal source of the desired signal is not caused. Moreover, since the signal output terminal 14a of the output line 14 is terminated by a termination resistor 15 of the nearly same value as the characteristic impedance of the output line 14, the radiation of the disturbing signal into space is not caused.
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