MULTICHANNEL TRANSPONDER AND A METHOD OF DETERMINING A MOST STRONGLY COUPLED CHANNEL OR MORE STRONGLY COUPLED CHANNELS
First Claim
1. A transponder comprising a multichannel front-end circuit;
- each channel of the multichannel front-end circuit comprising;
a resonant circuit associated with a respective antenna and producing, in use, an input voltage;
a conditioning circuit configured to provide a conditioned input voltage from the input voltage, anda comparator configured to compare the conditioned input voltage with a reference voltage;
wherein the front-end circuit further comprises;
a variable load connectable across each of the resonant circuits, and a controller configured to, in use, vary the variable load and detect an output from each of the comparators.
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Abstract
A transponder is disclosed comprising a multichannel front-end circuit; each channel of the multichannel front-end circuit a resonant circuit associated with a respective antenna and producing, in use, an input voltage; a conditioning circuit configured to provide a conditioned input voltage from the input voltage, and a comparator configured to compare the conditioned input voltage with a reference voltage; wherein the front-end circuit further comprises: a variable load connectable across each of the resonant circuits, and a controller configured to, in use, vary the variable load and detect an output from each of the comparators.
A method of operating such a transponder to determine a most strongly coupled channel, or more strongly coupled channels, is also disclosed.
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Citations
12 Claims
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1. A transponder comprising a multichannel front-end circuit;
- each channel of the multichannel front-end circuit comprising;
a resonant circuit associated with a respective antenna and producing, in use, an input voltage; a conditioning circuit configured to provide a conditioned input voltage from the input voltage, and a comparator configured to compare the conditioned input voltage with a reference voltage; wherein the front-end circuit further comprises; a variable load connectable across each of the resonant circuits, and a controller configured to, in use, vary the variable load and detect an output from each of the comparators. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- each channel of the multichannel front-end circuit comprising;
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8. A method of operating a transponder having a multichannel front-end circuit, and being in an electromagnetic field, wherein each channel comprises a resonant circuit associated with a respective antenna, the method comprising:
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varying a load across each of the resonant circuits; comparing a respective conditioned input voltage derived from a respective voltage across each of the resonant circuits with a predetermined reference voltage; and determining at least one of which channel is most strongly coupled to the field and which channels are more strongly coupled to the field, in response to the comparisons. - View Dependent Claims (9, 10, 11, 12)
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Specification