| 摘要 |
PURPOSE:To exactly execute a short circuit even in case when frequency of an intermediate frequency signal is high, by providing an intermediate frequency signal obstructing circuit on a main line, also utilizing the line length of the main line, and short-circuiting a loading point of a mixer diode, as high frequency. CONSTITUTION:A high frequency signal inputted from a high frequency signal input terminal 1, and a local oscillating signal inputted from a local oscillating signal input terminal 2 are propagated through a main line 3 through intermediate frequency signal obstructing circuits 8, 9, respectively, are applied to a mixer diode 4, and an intermediate frequency signal is fetched from an intermediate frequency signal output terminal 6 through a low-pass filter 5. The intermediate frequency signal obstructing circuit 8 showing open-circuit impedance against the intermediate frequency signal is provided in series on the main line 3 at a distance of 1/4 wavelength of the intermediate frequency signal from the mixer diode 4, and a terminal B of the mixer diode 4 is short-circuited by the intermediate frequency signal, as high frequency. |
