SINGLE-ANTENNA VEHICLE TRANSPONDER
First Claim
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1. A vehicle transponder comprising:
- an antenna, anda power directing means, the power directing means having a first port, a second port and a third port, where the power directing means is arranged to direct power from the first port to the second port and/or the third port,where the vehicle transponder further comprises a modulator, the modulator comprising a first port, a second port and a third port, where the second port of the power directing means is connected to the first port of the modulator, and where, in a first mode of operation, a received signal at the antenna is directed to the modulator via the power directing means,where further the modulator is arranged to modulate the received signal by means of phase shifting characterized in that the second port of the modulator is connected to an active amplifying means that is arranged to amplify and reflect the modulated signal to be transmitted via the antenna.
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Abstract
Embodiments of the present invention relate to a vehicle transponder comprising an antenna and a power directing means, the power directing means having a first port, a second port and a third port. In various embodiments, the power directing means is arranged to direct power from the first port to the second port and/or the third port. The transponder further comprises a modulator, which comprises a first port, a second port and a third port, where the second port of the power directing means is connected to the first port of the modulator.
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Citations
7 Claims
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1. A vehicle transponder comprising:
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an antenna, and a power directing means, the power directing means having a first port, a second port and a third port, where the power directing means is arranged to direct power from the first port to the second port and/or the third port, where the vehicle transponder further comprises a modulator, the modulator comprising a first port, a second port and a third port, where the second port of the power directing means is connected to the first port of the modulator, and where, in a first mode of operation, a received signal at the antenna is directed to the modulator via the power directing means, where further the modulator is arranged to modulate the received signal by means of phase shifting characterized in that the second port of the modulator is connected to an active amplifying means that is arranged to amplify and reflect the modulated signal to be transmitted via the antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification