Broadband-matching of Coupled Inductive Loops Used for Vehicle Communications

Safe and effective data communications systems are important components for modern traffic management. The transmission of information between vehicles and wayside equipment is required for railway systems, for management of road traffic and for control of transportation within factories. The application of inductive loops is well-known for all the named cases using different dimensions, frequencies and data transmission rates. A general approach seems to be useful in order to develop a design strategy taking into account the magnetic field, the geometric properties, the required transmission rate and therefore the bandwidth and structure of the filters to be used. The developed procedure delivers an optimized filter design based on the frequency-depending power transfer.