A passive radio link deflection, or passive repeater is a plant for the implementation of a microwave link, in which because of an obstacle in the signal path no direct line of sight microwave link is possible. The United States of America —commonly referred to as the In Telecommunication, the term outside plant has the following meanings In civilian Telecommunications, all cables conduits ducts poles A microwave link is a communications system that uses a beam of radio waves in the microwave frequency range to transmit Video, audio, or Data between two Line-of-sight propagation refers to Electro-magnetic radiation including light emissions traveling in a straight line It has the advantage over the installation of a microwave radio relay station with active components, that at the place of the installation no electricity supply is required and that no further frequencies are needed (at repeater stations with active components usually different frequencies for reception and transmission are used, in order to prevent feedbacks). Microwave radio relay is a technology for transmitting digital and analog signals, such as long-distance Telephone calls and the relay of A repeater is an electronic device that receives a signal and Retransmits it at a higher level and/or higher power or onto the other side of an obstruction The corresponding disadvantage is that the returned signal is significantly weaker.
Passive radio relay link defelection 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. The parabolic antenna is a high-gain reflector antenna used for radio television and data communications and also for radiolocation ( RADAR) on the UHF and A waveguide is a structure which guides waves such as Electromagnetic waves Light, or Sound waves 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. Microwave radio relay is a technology for transmitting digital and analog signals, such as long-distance Telephone calls and the relay of 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 transmitter. A tunnel transmitter allows wireless reception in Tunnels It consists of a receiving antenna which receives the signal to be radiated in the tunnel and a transmitting antenna Here a Yagi antenna receives the signal of the transmitter and supplies it by way of a coaxial cable to a second antenna. A Yagi-Uda Antenna, commonly known simply as a Yagi antenna or Yagi, is a Directional antenna system consisting of an array of a dipole Coaxial cable is a cable consisting of an inner conductor surrounded by a tubular insulating layer typically made from a flexible material with a high Dielectric constant, all
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