The team member, who had listened to lectures given by Murata and learned that noise is involved as a factor in slowing down the communication speeds of Wi-Fi, also found out that Murata had some noise suppression solutions. He made contact with the engineer in charge immediately, and explained the situation. The person in charge at Murata who had verified the circumstances suggested undertaking a collaborative evaluation with Company T, and this is what they did.
It takes time and man-hours to identify the causes of noise—all the more so because the sources and transmission paths of the noise are not visible. First, to obtain some overall impressions, the Wi-Fi module and antenna were separated, and the noise picked up by the antenna was measured using a spectrum analyzer. Next, the evaluations required were carried out down to the last detail by experts, and the causes of the noise were tracked down in just three days.
The identification of the causes was completed, and noise suppression components were inserted into the problem areas. The components were reassembled at the optimum mounting positions, and the final tests were conducted in a reverberation chamber, which is a dedicated evaluation apparatus that enables verification to be performed under actual conditions of use. As a result, we succeeded in suppressing the noise interference picked up by the Wi-Fi antenna by an impressive margin.