A flexible 12 cm times 12 cm EMI measurement sheet is developed to enable the measurement of the EMI distribution on the surface of the electronic devices by wrapping the devices in the sheet. The sheet includes 8times8 antenna array, 2V organic CMOS decoder, stretchable interconnects, and EMI detection LSI's (large scale integrations) in 0.18 mum CMOS. The distributed LSI's near the antennas enable the in-situ EMI measurement and have a potential to improve the measurement speed and accuracy. By changing the connection of the antenna to the LSI, the electric and magnetic fields are successfully measured separately. The minimum detectable magnetic field noise power was -70 dBm and the maximum detectable noise frequency was 1GHz. The minimum detectable electric field noise power was -60 dBm and the maximum detectable noise frequency was 700 MHz.