| 摘要 |
PROBLEM TO BE SOLVED: To suppress radiation of undesired electromagnetic waves in a communication system.SOLUTION: A signal detector comprises: a first interface which attenuates an input transmission signal to radiate it as an electromagnetic wave to an external medium; a second interface which transmits and receives electromagnetic waves to/from the external medium; and a switch which connects such that a transmission signal will be input to the second interface if the transmission signal radiated from the first interface is received as an electromagnetic wave by the second interface via the external medium in the case where it is connected such that the transmission signal is input to the first interface. |
