A passive repeater or passive radio link deflection, is a reflective or sometimes refractive panel or other object that assists in closing a radio or microwave link, in places where an obstacle in the signal path blocks any direct, line of sight communication.^[1]

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.^[1] 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, although in some configurations they can actually provide gain of 100 to 130 dB for UHF and microwave radio-relay stations.^[1]

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.^[1]

Similar systems are used also occasionally for TV relay transmitters or as tunnel transmitters. In these cases, a Yagi antenna receives the transmitted signal and supplies it by way of a coaxial cable to a second Yagi antenna.

See also external links for photos of variety of other passive repeaters.

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  Microwave repeaters on Black Hill, Hong Kong
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  Closer view of one of the Microwave repeaters on Black Hill, Hong Kong
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  Microwave repeater on a hill in Nagano, Japan

• Thrower, Ray D. (May 1969). "Radio Mirrors for Communications". Electronics World. ISSN 0959-8332. Archived from the original on 1 October 2023. Retrieved 28 October 2024.
• Passive Repeater Engineering, Microflect, Co. Inc, 1989
• LaFrance, Albert (20 September 2009). "Passive Microwave Repeater | Thurmont, MD". The Microwave Radio and Coaxial Cable Networks of the Bell System. Archived from the original on 6 September 2024. Retrieved 15 November 2024.