Electronic device, method and system for half duplex data transmission
First Claim
1. An electronic device for half-duplex transmission of radio signals comprising:
- three parallel-resonant circuits each having a coil in parallel with a capacitor and being arranged as a three-dimensional antenna for receiving radio signals, wherein the first parallel-resonant circuit comprises a first coil and a first capacitor, the second parallel-resonant circuit comprises a second coil and a second capacitor, the third parallel-resonant circuit comprises a third coil and a third capacitor, each parallel-resonant circuit configured to operate at a first frequency;
a circuit for determining which of the three parallel-resonant circuits receives the strongest radio signals and choosing that parallel-resonant circuit for receiving the radio signals; and
a control circuit configuring the chosen parallel-resonant circuit to be in series with a fourth capacitor to form a series-resonant circuit for transmitting radio signals, wherein the series-resonant circuit is configured to transmit radio signals in the same frequency range as the parallel-resonant circuits.
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Accused Products
Abstract
An electronic device and method for half duplex data transmission in a long range keyless entry and go system, and more specifically to an RFID transponder, a corresponding read/write (R/W) unit and methods for operating the RFID transponder and the R/W-unit. There is a first coil, a second coil and a third coil, being arranged as a three-dimensional antenna, a first capacitor, a second capacitor and a third capacitor couplable in parallel to the first coil, the second coil and the third coil, respectively, for selectively forming a first, a second and a third parallel-resonant circuit for receiving radio signals, a series-resonant circuit for transmitting radio signals and a control stage configured to either use one of the first, second or third parallel-resonant circuits for receiving radio signals or the series-resonant circuit for transmitting signals.
46 Citations
18 Claims
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1. An electronic device for half-duplex transmission of radio signals comprising:
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three parallel-resonant circuits each having a coil in parallel with a capacitor and being arranged as a three-dimensional antenna for receiving radio signals, wherein the first parallel-resonant circuit comprises a first coil and a first capacitor, the second parallel-resonant circuit comprises a second coil and a second capacitor, the third parallel-resonant circuit comprises a third coil and a third capacitor, each parallel-resonant circuit configured to operate at a first frequency; a circuit for determining which of the three parallel-resonant circuits receives the strongest radio signals and choosing that parallel-resonant circuit for receiving the radio signals; and a control circuit configuring the chosen parallel-resonant circuit to be in series with a fourth capacitor to form a series-resonant circuit for transmitting radio signals, wherein the series-resonant circuit is configured to transmit radio signals in the same frequency range as the parallel-resonant circuits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification