Abstract: An electronic apparatus case including: a circuit board provided on a lower case, the circuit board having a plurality of signal lines in parallel, each specified area of the circuit board between each adjacent pair of the plurality of signal lines having a plurality of first through holes and a plurality of second through holes, the plurality of first and second through holes respectively being arranged in a first and a second lines at substantially equal interval of ? or less of a wavelength of signals propagating in the plurality of signal lines, the first line and the second line being arranged in parallel, each center of each of the plurality of first through holes and each center of each of the plurality of second through holes being shifted with a gap in a direction of the first line and the second line.

Abstract: An electronic apparatus case including: a circuit board provided on a lower case, the circuit board having a plurality of signal lines in parallel, each specified area of the circuit board between each adjacent pair of the plurality of signal lines having a plurality of first through holes and a plurality of second through holes, the plurality of first and second through holes respectively being arranged in a first and a second lines at substantially equal interval of 1/8 or less of a wavelength of signals propagating in the plurality of signal lines, the first line and the second line being arranged in parallel, each center of each of the plurality of first through holes and each center of each of the plurality of second through holes being shifted with a gap in a direction of the first line and the second line.