A feed structure (18) and matching circuit (20) for inductively coupling
an antenna (16) with an IC (22) in an RFID tag (10). The tag (10)
includes first and second feed structures (26,28) coupled with the
antenna (16), a first transmission line (30) coupling the feed structures
(26,28), and a matching circuit (20) including a second transmission line
(32) having a portion that is substantially parallel to and spaced apart
from the first transmission line (30) such that the first and second
transmission lines (30,32) inductively couple. Where two or more antenna
elements (56,57) are used, the elements (56,57) are sufficiently loosely
coupled by inductive coupling that they can operate at nearly the same
frequency without forming a single resonant antenna. Thus, for example,
different elements can operate at approximately 905 MHz and approximately
925 MHz, respectively, to effectively cover the FCC range of 900-930 MHz.