EMI Suppression Filters(EMC and Noise Suppression)

EMI Suppression Filters (EMC and Noise Suppression)<Wireless LAN (Wi-Fi)> Solutions for offsetting reductions in Wi-Fi reception sensitivity

Wireless LAN (Wi-Fi) functions are increasingly being incorporated into many different products, such as mobile devices and printers.

However, if there is noise in the same frequency band as the Wi-Fi communication band inside a product, this will cause deterioration in the Wi-Fi communication characteristics.

Furthermore, the effects of very faint noise cannot be ignored in the case of self-inflicted interference problems arising inside the devices, and definitive ways of suppressing the noise are demanded.

Problems of noise in products with Wi-Fi capabilities

Different kinds of noise inside a product serve as noise sources.
Many and varied transmission paths exist.
The effects of very faint noise cannot be ignored.

Improving the speed of Wi-Fi communication

Murata’s solution (example)

Location where noise suppression measure is applied

Results of noise suppression

In the case above, it is the higher harmonic waves of the CLK signal (50 MHz) transmitted to the Wi-Fi module that creates the problem, and the FPC connecting the main board and Wi-Fi module behaves as a noise-radiating source.

By replacing the damping resistor with a noise filter made by Murata, the noise picked up by the Wi-Fi antenna is reduced by approximately 15 dB, and Wi-Fi reception sensitivity can be improved by approximately 5 dB.

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