| 摘要 |
PURPOSE:To prevent the signal transmission of an undesired frequency inexpensively by forming a resonance electrode having a length of 1/4 wavelength to a top open end of a strip line connected to an input side circuit and to a tip open end of a strip line connected to an output side circuit respectively. CONSTITUTION:A resonance electrode 3 having a length of 1/4 wavelength formed to the tip open end 1a of one strip line 1 and a resonance electrode 4 having a length of 1/4 wavelength formed to the tip open end 2a of another strip line 2 are arranged in parallel. The resonance electrodes 3, 4 are constituted as a band-pass filter sending the desired frequency component with less attenuation by deciding properly the width W and the opposed interval (d). Further, the resonance electrodes 3, 4 are formed by trimming the tip of the microstrip lines l, 2 by a 1/4 wavelength.
|
