Measurement of Shielding Effectiveness in the Microwave Frequency Range using a Dual Focus Flat Cavity

We suggested a new measurement method of SE (Shielding Effectiveness) in the microwave frequency range using a DFFC (Dual Focus Flat Cavity). TE waves are transmitted from the transmitting point to the receiving point through the testing material. The shape of the DFFC is oval and the transmitted waves are focused at the receiving point with the same phase. This method has a large dynamic range of about 100 dB. We evaluated this method at a number of frequencies by comparing the calculated value with the measured value using isotropic materials. The differences were less than 3 % at each frequency. The measurement repeatability error was less than 2 %.