Appeal No. 2005-0171
Application No. 10/064,380
identified. Two-way communication is provided between the reader
and the tag through inductively-coupled coils. The reader drives
its coils through capacitors at a driving frequency and the tag
detects the reader’s signal by way of the tag’s inductively-coupled
coil connected in parallel with a capacitor.
Claims 1 and 32 are illustrative of the invention and read as
follows:
1. A reader for use with a tag that communicates data to the
reader, the reader comprising:
a transformer having a plurality of windings, each winding
having first and second terminals;
a coil driver having first and second output terminals;
two capacitors, each capacitor having first and second
terminals, the first and second output terminals of the coil driver
being connected to the first terminals of the capacitors, the
second terminals of the capacitors being connected to the first and
second terminals of a winding of the transformer;
a coil having first and second terminals connected
respectively to the first and second end terminals of a winding of
the transformer;
a data extractor for extracting data from the signal induced
in the coil, the data extractor having first and second terminals
connected respectively to first and second terminals of a winding
of the transformer.
32. A reader for use with a tag that transmits a data sequence
to the reader by repeating a message a plurality of times, the
message comprising a preamble, a tag data group of T bits, and an
error-detecting group of E bits, the preamble consisting of a sync
sequence of S bits, the tag data group and the error-detecting
2
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Next
Last modified: November 3, 2007