Passive repeater

A passive radio deflection is a system for implementing a radio link that is not directly due to an obstacle is possible in the signal path.

Technical Background

Compared to the construction of a relay station with the active components, the passive radio deflection has the advantage that, at the installation site is no power supply is required, and no other frequencies are required. Relay stations with active components usually require different transmit and receive frequencies, since using the same frequency, there is the danger of feedback. This is offset by the disadvantage that if the passive systems, the deflected signal is much weaker than that of the active.

For passive deflection, there are two methods:

The antenna method

The signal from a directional antenna with a large profit is, for example, collected a parabolic antenna and fed via a coaxial cable or waveguide to a second directional antenna which radiates it in the desired direction.

Such systems are sometimes used as a TV converter or as a tunnel station.

The method reflector ( mirror )

A deflection flat surfaces of metallic material are used, which are arranged so that the incident signal is controlled in accordance with the law of reflection in the desired direction. For small deflection angles and cavity prisms may be used.