Near-field miniature coupler

Details Near-field miniature coupler Near-field miniature coupler

2007-03-30

2010-11-23

Mullen, Thomas J (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S010510, C455S041100

Reexamination Certificate

active

07839287

ABSTRACT:
A near-field coupler for a RFID system is provided. The coupler is configured to selectively communicate with a targeted transponder from among a group of multiple adjacent transponders. The coupler includes a conductive strip terminated by a load. The load is for matching an input impedance of the coupler to a source impedance of a transceiver. The conductive strip is based on a quarter wavelength of the center operating frequency. The conductive strip may have a substantially constant width and a length substantially equal to the quarter wavelength. Or the conductive strip may have a variable width defining a tapered profile and a length less than the quarter wavelength. The tapered profile may be an exponential profile or a Klopfenstein profile. Due to the overall size of the coupler to a typical transponder, the center of the coupler and the center of the transponder may be offset during coupling.

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