ring antenna

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• Choke ring antenna — Patent Diagram of a Choke Ring Antenna[1] A choke ring antenna is a particular form of omnidirectional antenna for use at high frequencies. It consists of a number of conductive concentric cylinders around a central antenna. Due to its delicate… …   Wikipedia

• Ring circuit — In electricity supply, a ring final circuit or ring circuit (informally also ring main or just ring) is an electrical wiring technique developed and primarily used in the United Kingdom that provides two independent conductors for live, neutral… …   Wikipedia

• Omnidirectional antenna — The radiation pattern of a simple omnidirectional antenna, a vertical half wave dipole antenna. In this graph the antenna is at the center of the donut . Radial distance from the center represents the power radiated in that direction. The power… …   Wikipedia

• Patch antenna — A patch antenna is a popular antenna type, which gains its name from the fact that it basically consists of a metal patch suspended over a ground plane. The assembly is usually contained in a plastic radome, which protects the structure from… …   Wikipedia

• Metamaterial antenna — This Z antenna tested at the National Institute of Standards and Technology is smaller than a standard antenna with comparable properties. Its high efficiency is derived from the Z element inside the square that acts as a metamaterial, greatly… …   Wikipedia

• Folded unipole antenna — The folded unipole antenna was first devised for broadcast use by the late John H. Mullaney, an American radio broadcast pioneer, and consulting engineer. Designed to solve some difficult problems with existing medium wave (MW) amplitude… …   Wikipedia

• Douglas H. Ring — (March 28, 1907 in Montana – September 8, 2000 in Red Bank, New Jersey) was one of the Bell Labs engineers that invented the cell phone. The history of cellular phone technology began on December 11, 1947 with an internal memo written by Douglas… …   Wikipedia

• Corona ring — Corona rings on 380 kV line insulators …   Wikipedia

• Orlunda radio transmitter — Orlunda transmitter building today with 86.4 metre tall guyed mast used for mobile phone services …   Wikipedia

• Eilvese transmitter — was a facility of Transradio AG for intercontinental VLF transmission of telegrams at Eilvese, Germany. It went into service in 1913 and used machine transmitters. There were two antennas: an umbrella antenna, which was mounted in the middle on a …   Wikipedia

• LZ 127 Graf Zeppelin — Infobox Aircraft name=LZ 127 Graf Zeppelin caption= type=Passenger airship national origin=Germany manufacturer=Luftschiffbau Zeppelin designer=Ludwig Dürr first flight=18 September avyear|1928 introduced= retired=18 June avyear|1937… …   Wikipedia