| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a printed circuit board enabling large attenuation at a higher frequency band than the cutoff frequency of a low-pass filter.SOLUTION: A printed circuit board 100 includes a printed wiring board 200 having a transmission line 201 for transmitting a digital signal. The printed circuit board 100 also includes a low-pass filter 500 which is disposed on the transmission line 201 and includes capacitor elements 51, 53 and inductor elements 52. The transmission line 201 includes a signal wiring pattern 212 connected to a signal output terminal 502 of the low-pass filter 500, and an open stub wiring pattern 213 whose one end is a connection end 223 connected to the signal wiring pattern 212 and another end is an open end 224 that is open. The electric length of the open stub wiring pattern 213 is a 1/4 of wavelength corresponding to the fundamental frequency of the digital signal or greater.</p> |
