Patent ID: 7075418

Claim:
A multiband antenna comprising: a terminating end connectable to transmitter/receiver apparatus and a distal end opposite the terminating end; a solid core wire extending between the terminating end and the distal end and having an overall electrical length equivalent to one-quarter wavelength of a frequency in a predetermined frequency range lower than a tire pressure monitoring frequency range; a tire pressure monitoring frequency self-resonant circuit section disposed a predetermined distance from the terminating end such that a portion of the solid core wire between the tire pressure monitoring frequency self-resonant circuit section and the terminating end has an electrical length equivalent to one-quarter wavelength in the tire pressure monitoring frequency range; and the tire pressure monitoring frequency self-resonant circuit section comprising, in combination, a portion of the solid core wire formed into a multiple-turn coiled section wherein the self-resonant circuit section has a signal blocking impedance at a tire pressure monitoring frequency defined by an inductive component provided by turns of the respective multiple-turn coiled section and a capacitive component provided by stray capacitance across the turns of the respective multiple-turn coiled section; whereby when the antenna is connected to a multiplexer on a vehicle equipped with a wireless tire pressure monitor apparatus transmitting in the tire pressure monitoring frequency range, the antenna will optimally receive and conduct signals in both the tire pressure monitoring frequency range and the lower frequency range.