Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1978-08-14
1980-06-10
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
246 7, 246121, 343 5PD, 343 13R, 375 37, G01S 956
Patent
active
042075696
ABSTRACT:
Disclosed is a waveguide for conducting radio frequency signals along a railroad line comprising the ballast, ties and rails of the railroad line. If the waveguide is utilized for intra-train communication, the wheels, axles and under-vehicle parts of the vehicles of the train comprise the side and upper surfaces of the waveguide. The waveguide may be utilized to: (1) transmit data such as train vehicle journal bearing temperatures, from remote locations to either the caboose or engine of the train; (2) guide radar-type radio frequency pulses ahead of the train; or (3) transmit any other data. In the radar embodiment, reflections received by a receiver on the train represent changes in the characteristic impedance of the waveguide. These reflections may be compared to anticipated reflections in order to detect improper conditions such as broken track or the presence of another train.
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