Matsushita Electric Industrial Co., Ltd.

Satoru Handa

Yoshihiko Tanji

Akira Nakatsuka

A reflection multiplier radio wave marker system which comprises a plurality of transmit antennas mounted on board a vehicle for transmitting electric wave signals in a first frequency; a reflection multiplier radio wave marker installed in the surface of a road, which reflects and transmits the electric wave signal of first frequency after multiplying it into an electric wave signal of a second frequency; and a receive antenna mounted on board the vehicle for receiving the electric wave of second frequency. The system specifies the location of a vehicle in a traffic lane by making use of the second frequency electric wave signal reached from a marker. It can detect a marker throughout substantially the entire width range of a vehicle. A traffic system using the marker system is also disclosed. The function of specifying the location of a radio wave marker is performed throughout the entire vehicle width.

Reflection multiplier radio wave marker system and traffic system

The level of the electromagnetic waves transmitted by resonance of an electric resonator is only one hundredth that of calling radio waves of the detector. Furthermore, when an IC is mounted on the electric resonator and a modulated information code is superposed, the level of the superimposed electromagnetic waves further declines. As a result, sufficient detection directivity and detection distance could not be obtained. To address these problems, the present invention stores a cyclic coil and a capacitor used to cause an electric resonance in response to the first frequency in a sealed non-magnetic container to prevent degradation.

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Nara, Japan

Satoru Handa