SYSTEM FOR PREVENTING EAVESDROPPING OF RADIO WAVE, METHOD FOR SAME, AND WALL MEMBER

摘要

PROBLEM TO BE SOLVED: To provide a system for preventing eavesdropping of a radio wave and a method for the same wherein secrecy is remarkably enhanced. SOLUTION: A reception antenna A with directivity toward the inside of a building is installed, and transmission antennas B1 and B2 with directivity toward the outside of the building are installed on an outer wall face of the building. The reception antenna A receives and processes one radio wave or more transmitted from a server 102 and a client 104 used inside the building and thereafter the transmission antennas emit the processed radio wave with the same output as that of the radio wave from the radio apparatuses and leaked from the building. Thus, the system gives interference to a radio apparatus of an external eavesdropper with respect to a wireless LAN to allow the external interceptor to make eavesdropping difficult without giving effect on the radio apparatuses in use in a room and giving disturbance to communication using other frequency by a portable telephone or the like. The reception antenna A and the transmission antennas B1 and B2 may be installed on a wall face or buried in the wall face. COPYRIGHT: (C)2004,JPO&NCIPI