Wire Guidance – VNA Applications

Wire Guidance is based on the fact that a wire conductor through which a signal is flowing, will create an electromagnetic field around itself. The field is strongest at the conductor and it’s magnitude decreases as it radiates out. A line driver dispatches the signal to the wire installed in the floor. The electromagnetic field is the generated around the wire (conductor). A guide antenna located on the underside of the vehicle contains two coils positioned to be an either side of the embedded wire. The electromagnetic field passes through the coils and induces an electric voltage across the coil ends. The voltage can be detected across the termination of the coil and is proportional to the strength of the field. The difference in electric voltage between the two coils will, after amplification, send a signal to the steering motor of the lift truck.