EMI Suppression Filters (EMC and Noise Suppression)Pre-evaluation for Noise Suppression

Grasp the intra-system EMC status by measuring the noise level received by antennas.
We connected a coaxial cable to the power supply point of the antenna and connected the antenna to a spectrum analyzer through an RF amplifier, and evaluated the noise level received by the antenna.

Examine sources of noise and the noise propagation mechanism by measuring the adjacent electromagnetic field distribution.
We connected the electric field probe and the magnetic field probe attached to the EMI tester to the spectrum analyzer through the RF amplifier, and evaluated the adjacent electromagnetic field distribution.

The measurement method introduced here is the Murata-original MIMO-OTA (Over the Air) evaluation specific to noise evaluation.
This evaluation method has the following merits.

A reverberation chamber is required to measure the Total Isotropic Sensitivity (TIS) that is total receiving sensitivity (formal evaluation). Reverberation chamber is one of evaluation systems recommended by the 3GPP system.

The measurement result in the following figure shows that the receiving sensitivity is more improved as the value decreases.