An antenna comprises two elongate antenna segments (740, 740, 862,
940, 970, 1208/1212, 1300, 1320, 1322/1324, 1360, 1360, 1520, 1520,
1520, 1523, 1523, 1620, 1720, 1820, 1920) which extend from
first ends (742, 742, 864, 942, 972, 1322e, 1362, 1362,
1522, 1522, 1522, 1622, 1922)/(744, 744, 868, 944,
974, 1324e, 1364, 1364, 1524, 1524, 1524,
1624, 1924) connected to the antenna coupling coil in opposite directions to
second ends (744, 744, 868, 944, 974, 1322c, 1366, 1366,
1524, 1524, 1524, 1624, 1924)/(742, 742, 864, 942,
972, 1324c, 1368, 1368, 1522, 1522, 1522,
1622, 1922) at least partially around the inner surface of the tire. The antenna
and antenna coupling coil are mounted to the inner surface of the tire, and the
transponder module is attached to the antenna coupling coil in a way which positions
the transponder coupling coil in close proximity and concentric to the antenna
coupling coil, thereby providing effective transformer-type coupling between the
transponder and the antenna.
