![]() These two types have similar optical properties.Ī large relatively thin retroreflector can be formed by combining many small corner reflectors, using the standard hexagonal tiling.Ĭat's eye Eyeshine from retroreflectors of the transparent sphere type is clearly visible in this cat's eyesĪnother common type of retroreflector consists of refracting optical elements with a reflective surface, arranged so that the focal surface of the refractive element coincides with the reflective surface, typically a transparent sphere and (optionally) a spherical mirror. The second form uses mutually perpendicular flat mirrors bracketing an air space. In this structure, the reflection is achieved either by total internal reflection or silvering of the outer cube surfaces. In the more common form, the corner is literally the truncated corner of a cube of transparent material such as conventional optical glass. Therefore, as the ray reflects first from side x then side y and finally from side z the ray direction goes from to to to and it leaves the corner with all three components of its direction exactly reversed.Ĭorner reflectors occur in two varieties. When the ray reflects from the first side, say x, the ray's x-component, a, is reversed to − a, while the y- and z-components are unchanged. The three corresponding normal vectors of the corner's sides form a basis ( x, y, z) in which to represent the direction of an arbitrary incoming ray. Miguel Tomas has added a new project titled Ultra low power home DC electrical system - 3rd.A set of three mutually perpendicular reflective surfaces, placed to form the internal corner of a cube, work as a retroreflector.Miguel Tomas has added details to Ultra low power home DC electrical system - 3rd.Miguel Tomas has added a new project titled Ultra low power home DC electrical system - 4th.Miguel Tomas has added details to Ultra low power home DC electrical system - 4th.648392270 liked Blind assistance smart camera glasses.piplay has updated details to Expandable Thermocouple Multiplexor Board.648392270 liked Mouse Fatigue Estimation by GSR & EMG Values w/ TF.Chris liked Generative AI on a Microcontroller.KennethBruno wrote a comment on project log Project Log 1 - Beginning at the End.Dude on Arduino Sticker Dispenser Saves Time.Dan on Hackaday Links: November 12, 2023.WereCatf on Data Science The Stanford Way.Telectroboy on Leaky SMD Electrolytics? Try These Brute Force Removal Methods.Oskar on A Small-Packing Antenna For 2 Metre Portable Work.BT on General Instruments Video Game Chip Rides Again.Dude on Utah NuScale Nuclear Plant Project Canceled Due To Lack Of Interest From Utilities.jpa on Hackaday Links: November 12, 2023.This Week In Security: Find My Keylogger, Zephyr, And Active Exploitation 7 Comments Using PCB material for antennas isn’t anything new, either, but we still enjoyed this simple corner reflector build.Ĭontinue reading “Cornering The Antenna Market” → Posted in Radio Hacks Tagged antenna, corner reflector The reflector is pretty small, but you can easily make bigger ones. In fact, hams that use handy talkies for direction finding often use their bodies to block signals, much like these reflectors should. Intuitively, you’d think this kind of antenna would be good for direction finding purposes. He didn’t, however, measure the gain or directional selectivity due to the reflector. After the obligatory chalk talk, he breaks out the vector network analyzer and shows how well it matches. The antenna, in this case, is essentially a quarter-wave antenna with a ground plane and reflector arrangement. A single wire makes the “driven element,” and by bending it to just the right position, you can change the characteristic impedance for matching. In a clever use of copper-clad board, he was able to make a reasonable reflector by soldering together three boards and an RF connector. He had built one years ago and decided to do a bit of research and make another one. But shows another common-sense antenna arrangement: a corner reflector dipole. ![]() However, when you see things like a dish antenna, it sort of makes sense, right? Just like a mirror focuses light, the parabola of a dish focuses RF energy. ![]() Sometimes antennas can seem like black magic. ![]()
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