Inductive reader device and method with integrated antenna and signal coupler
First Claim
1. An inductive reader device comprising:
- a transmitter;
a receiver;
a first coil element connected to the transmitter, wherein the first coil element emits and receives radio frequency signals via inductive coupling to a transponder, the radio frequency signals including a data signal from the transponder; and
a second coil element connected to the receiver and inductively coupled to the first coil element such that the receiver receives from the second coil element via the first coil element the data signal from the transponder.
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Accused Products
Abstract
An inductive reader device (104) communicates with a transponder (102) using electromagnetic coupling. The reader device includes a transmitter (112), a receiver (114), a first coil element (116), and a second coil element (118). The first coil element is directly connected to the transmitter to emit a radio frequency excitation signal. The first coil element receives a radio frequency response signal from the transponder via electromagnetic coupling. The second coil element is directly connected to the receiver to provide a response signal to the receiver. The second coil element is loosely or inductively coupled to the first coil element via a predetermined mutual inductance due to the spatial relationship between the first coil element and the second coil element. Hence, the second coil element receives the radio frequency response signal from the first coil element. Advantageously, a signal coupler required for the receiver is integrated with an antenna element by virtue of the second coil element.
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Citations
39 Claims
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1. An inductive reader device comprising:
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a transmitter;
a receiver;
a first coil element connected to the transmitter, wherein the first coil element emits and receives radio frequency signals via inductive coupling to a transponder, the radio frequency signals including a data signal from the transponder; and
a second coil element connected to the receiver and inductively coupled to the first coil element such that the receiver receives from the second coil element via the first coil element the data signal from the transponder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio frequency communications system comprising:
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a transponder; and
a reader device, the reader device comprising;
a transmitter;
a receiver;
a first coil element connected to the transmitter;
wherein the first coil element emits and receives radio frequency signals via inductive coupling to the transponder, the radio frequency signals including a data signal from the transponder; and
a second coil element connected to the receiver and inductively coupled to the first coil element such that the receiver receives from the second coil element via the first coil element the data signal from the transponder. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
a coil that receives radio frequency signals;
a transceiver connected to the coil to receive radio frequency signals from the coil; and
a control circuit coupled to the transceiver to control the data signal from the transponder.
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19. An inductive reader device comprising:
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a transmitter;
a receiver;
a first coil element connected to the transmitter;
wherein the first coil element emits and receives radio frequency signals via inductive coupling to a transponder, the radio frequency signals including a data signal from the transponder; and
a second coil element connected to the receiver and inductively coupled to the first coil element such that the second coil element receives a coupled signal from the first coil element and the receiver receives the coupled signal from the second coil element, the coupled signal including the data signal from the transponder. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for communicating between an inductive reader device and a transponder, the method comprising the steps of:
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A) coupling a first coil element connected to a transmitter of the inductive reader device with the transponder via inductive coupling;
B) receiving a radio frequency signal produced by the transponder in response to inductive coupling between the transponder and the first coil element, the radio frequency signal including a data signal; and
C) inductively coupling a second coil element connected to a receiver of the inductive reader device with the first coil element such that the second coil element receives a coupled signal from the first coil element and the receiver receives the coupled signal from the second coil element, the coupled signal including the data signal from the transponder. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
A1) the inductive reader device emitting an excitation signal; and
A2) the excitation signal energizing the transponder to produce the radio frequency signal.
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Specification