COUPLING FRAMES FOR RFID DEVICES
First Claim
Patent Images
1. An RFID device comprising:
- a transponder chip module (TCM) comprising an RFID chip (IC) and a module antenna (MA); and
a coupling frame (CF) comprising a conductive surface and having an electrical discontinuity comprising a slit (S) or non-conductive stripe (NCS) extending through the surface from an outer edge thereof to an inner position thereof, wherein the coupling frame is disposed so that the slit (S) or non-conductive stripe (NCS) overlaps at least a portion of the module antenna (MA).
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Abstract
A transponder chip module (TCM) comprises an RFID chip (CM, IC), optionally contact pads (CP), a module antenna (MA), and a coupling frame (CF), all on a common substrate or module tape (MT). The coupling frame (CF) may be in the form of a conductive layer having an outer edge (OE) and a slit (S) or non-conductive stripe (NCS) extending from the outer edge to an inner position thereof which may be a central opening (OP). The coupling frame (CF) may be arranged so that the slit (S) or non-conductive strips (NCS) overlaps at least a portion of the module antenna (MA). Methods and apparatus are disclosed.
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Citations
12 Claims
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1. An RFID device comprising:
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a transponder chip module (TCM) comprising an RFID chip (IC) and a module antenna (MA); and a coupling frame (CF) comprising a conductive surface and having an electrical discontinuity comprising a slit (S) or non-conductive stripe (NCS) extending through the surface from an outer edge thereof to an inner position thereof, wherein the coupling frame is disposed so that the slit (S) or non-conductive stripe (NCS) overlaps at least a portion of the module antenna (MA). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of improving coupling between an RFID device comprising a transponder chip module (TCM) and an external reader, the transponder chip module (TCM) comprising an RFID chip (IC, CM) and a module antenna (MA), characterized by:
incorporating an open-loop conductive coupling frame (CF) in the transponder chip module (TCM), wherein the coupling frame (CF) has a slit (S) or non-conductive stripe (NCS) extending from an outer edge (OE) thereof to an interior position thereof and coupling frame (CF) is positioned so that the slit (S) or non-conductive stripe (NCS) overlaps at least a portion of the module antenna (MA, PA, LES). - View Dependent Claims (11)
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12. In conjunction with an RFID device comprising an antenna having a number of tracks or turns separated by spaces, a coupling frame (CF) comprising a conductive surface and having an electrical discontinuity comprising a slit (S) or non-conductive stripe (NCS) extending through the surface from an outer edge thereof to an inner position thereof, wherein the coupling frame is disposed so that the slit (S) overlaps at least a portion of the module antenna (MA).
Specification