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A passive radio link deflection, or passive repeater is a plant that implements a microwave link, in places where an obstacle in the signal path blocks any direct, line of sight microwave link. Compared to a microwave radio relay station with active components, a passive repeater is far simpler and needs little maintenance and no on-site electric power. It also does not require additional frequencies, unlike active repeater stations which use different transmit and receive frequencies to prevent feedback. The corresponding disadvantage is that without amplification the returned signal is significantly weaker.
Passive radio relay link deflection systems in the vertical level can be realized by receiving the signal with a parabolic antenna and leading it through a waveguide to a second parabolic antenna, where it is radiated. For passive microwave radio relay link deflections in the horizontal plane, flat surfaces of metallic material are used, arranged so that the angle of incoming beam corresponds to the angle of the outcoming signal. The resulting structure resembles a billboard. For small deflection angles, cavity prisms can be used.
Similar systems are used also occasionally for TV relay transmitters or as tunnel transmitters. A Yagi antenna receives the signal of the transmitter and supplies it by way of a coaxial cable to a second antenna.