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leaky feeder signal transmission

Leaky waveguides are coaxial cables whose outer conductor is slit at regular intervals. The spacing of the slit openings is determined by the radiated wavelength

. The

waves can emerge from these slit openings and propagate.

Since antennas, resonant circuits and coaxial cables are subject to the same high-frequency laws, the leaky waveguide acts like an antenna and can be used to radiate the microwaves. In a normal coaxial cable, the outer conductor is not only shielding

, but determines the frequency response. Leaky waveguide

with radial slots, photo: Siemens

with radial slots, photo: Siemens

Leaky waveguides are used in tunnels where they ensure interference-free radio reception, as well as in office buildings and industrial plants as antennas for WLANs, where they ensure flawless WLAN communication even in heavily impaired building environments where no cable can be laid.

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Englisch: leaky feeder signal transmission
Updated at: 16.12.2015
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