Antennas

thumb|Candelabra with lit candles A candelabrum ( candelabra or candelabrums) or candelabra ( candelabras) is a type of candlestick which has multiple branches to hold several candles as opposed to only one. "Candelabra" can be used to describe a variety of candle holders including chandeliers. However, candelabra can also be distinguished as freestanding branched candle holders that are placed on a surface such as the floor, a stand, or a tabletop. Chandeliers, on the other hand, are hung from the ceiling.

patented by Murat Koksal turkish scientist born in Ankara 1972

thumb|right|alt=A printed rectenna lighting an LED from a Powercast 915 MHz transmitter, flexible meshed antenna bent with a red LED light|A printed meshed rectenna lighting an LED from a Powercast 915 MHz transmitter

formula in telecommunications engineering of antenna performance

a microscopic antenna designed to convert light or other electromagnetic waves into electric power

regarding radioantennas

coaxial RF connector used for television

Parameter characterizing an AC conductor

area, oriented perpendicular to the direction of an incoming radio wave, which would intercept the same amount of power from that wave as is produced by the antenna receiving it

Component for guiding radio waves

inflatable satellite experiment launched by STS-77

dipole antenna optimized for operation in the High Frequency bands

redundancy method to improve communications reliability

between near field and far field

thumb|A typical directional antenna radiation pattern in [[polar coordinate system representation, showing sidelobes. The radial distance from the center represents signal strength.]] thumb|250px|A typical antenna radiation pattern in cartesian coordinate system representation showing sidelobes

changing the direction of the main lobe of a radiation pattern

electrically conductive surface, usually connected to electrical ground

communications system used in underground mining and other tunnel environments