We have proposed the pipe-based transmission system, which uses refrigerant pipe of the multi air-conditioner, and can expand the wireless communication system confined within a room space into the communication system applicable to the whole building. In this paper, EMC characteristics of the Refrigerant pipe-based transmission line, such as LCL (Longitudinal Conversion Loss) and leaked electric field, are calculated by using the method of moment, and it is clear that the calculation values of the EMC characteristics almost agreed with measurement values. Furthermore, it is suggested by computer simulation of the real scale model that the pipe based transmission system has possibility to comply with the EMI regulation specified by the electrical appliance and material safety law in Japan.
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