Patent ID: 8186209

Claim:
In a tire pressure monitoring system the improvement comprising: a valve communicating between a tire interior and the atmosphere, the valve comprising: a valve stem formed of an electrically conductive material and including a valve seat formed in the interior of the valve stem; a valve pin positioned concentrically within the valve stem and formed of an electrically conductive material, the valve pin being positioned such that it is electrically isolated from the valve stem, the combination of the valve stem and the valve pin forming a shielded coaxial electrical transmission path; a resilient seal which seals against the valve seat such that, when the resilient seal is seated against the valve seat, air within the tire does not escape to the atmosphere and when the resilient seal is not seated against the valve seat, air can be added to the interior of the tire or air can be permitted to escape to the atmosphere; a bias spring which biases the resilient seal such that the seal is seated against the valve seat; a first electrical connector which provides electrical communication between the valve stem and a ground connection of a tire pressure measurement module positioned within a tire such that the valve stem is maintained at ground potential; a second electrical connector which provides electrical communication between the valve pin and a tire pressure signal connection of the tire pressure measurement module such that the valve pin transmits a signal including tire pressure information, the signal being shielded from electromagnetic interference by the valve stem; a conductive radiating structure electrically connected or coupled to the valve pin to receive the tire pressure information signal from the valve pin and transmitting the received signal to a receiver.