Telecommunications – Transmitter – Modulation by absorption – shielding – or reflecting
Patent
1995-07-17
1998-06-30
Urban, Edward F.
Telecommunications
Transmitter
Modulation by absorption, shielding, or reflecting
455517, 455522, 455562, H03C 152, H04B 102
Patent
active
057747954
ABSTRACT:
A communication area for an antenna disposed on a toll collection gate and a communication area for a responder unit (IU) mounted on an automobile are arranged to coincide with each other. Communication failure in overlapping areas where a plurality of communication areas are formed in a toll collection area is prevented. When an IU receives a pilot signal-wave, a carrier-radio-wave-signal is subsequently transmitted thereto. The IU modulates the carrier-radio-wave-signal with a responding data-signal and transmits the modulated-carrier-radio-wave as a responding signal-wave. In this system, the output power of the responding signal-wave is attenuated during the round trip of the carrier-radio-wave. Therefore, the output power thereof is decreased from an original level when the pilot signal-wave is transmitted. On the other hand, when other signal waves are transmitted, their output power are restored to the original level, thereby equalizing the power of the responding signal of the IU and that of the communication signals from the antenna. Thus, steady communication is ensured.
REFERENCES:
patent: 4303904 (1981-12-01), Chasek
patent: 5056109 (1991-10-01), Gilhousen et al.
patent: 5086389 (1992-02-01), Hassett et al.
patent: 5144553 (1992-09-01), Hassett et al.
patent: 5390338 (1995-02-01), Bodin et al.
Arthur Gertrude
Nippondenso Co. Ltd.
Urban Edward F.
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