Coaxial antenna


Coaxial antenna

A coaxial antenna (often known as a coaxial dipole) is a particular form of a half-wave dipole antenna, most often employed as a vertically polarized omnidirectional antenna.

Contents

History

Arnold B. Bailey was granted the US patent 2,184,729 Antenna System on December 26, 1939 after filing in 1937 for a vertical antenna providing coaxial element sleeve structures.

Bonnie Crystal was granted the US patent 7,151,497 Coaxial Antenna System on December 19, 2006 after filing in 2003 for new types of coaxial antennas with reduced size providing efficient broadband, wideband and controlled bandwidths, using radiation by the outside of the coaxial elements.

Configuration

In the most basic form, a quarter-wavelength section of coaxial cable is prepared such that the inner and outer conductors are separate but still attached to the remaining cable.

The outer (sheath) conductor is connected to a quarter-wavelength conducting sleeve into which the cable is inserted, and the inner conductor protrudes vertically above the sleeve for a quarter-wavelength. Also, additional quarter-wavelength sections may be connected to outer conductor to form a better ground plane.

Bazooka Dipole coaxial antenna

Dipole antennas constructed using coaxial cables with shorted ends are often given the name "Bazooka" dipoles.

See also

External links




Wikimedia Foundation. 2010.

Look at other dictionaries:

  • coaxial antenna — bendraašė antena statusas T sritis radioelektronika atitikmenys: angl. coaxial antenna vok. Koaxialantenne, f rus. коаксиальная антенна, f pranc. antenne à feeder coaxial, f …   Radioelektronikos terminų žodynas

  • Antenna (radio) — Whip antenna on car …   Wikipedia

  • Coaxial cable — RG 59 flexible coaxial cable composed of: A: outer plastic sheath B: woven copper shield C: inner dielectric insulator D: copper core Coaxial cable, or coax, has an inner conductor surrounded by a flexible, tubular insulating layer, surrounded by …   Wikipedia

  • Antenna tuner — An antenna tuner, transmatch, or antenna tuning unit (ATU) matches a transceiver with a fixed impedance (typically 50 ohms for modern transceivers) to a load (feed line and antenna) impedance which is unknown, complex or otherwise does not match …   Wikipedia

  • Microstrip antenna — In telecommunication, there are several types of microstrip antennas (also known as printed antennas) the most common of which is the microstrip patch antenna or patch antenna. A patch antenna is a narrowband, wide beam antenna fabricated by… …   Wikipedia

  • Dipole antenna — A schematic of a half wave dipole antenna connected to an unbalanced coaxial cable. Better practice is to connect the balanced dipole to the unbalanced line with a balun. A dipole antenna is a radio antenna that can be made of a simple wire, with …   Wikipedia

  • Parabolic antenna — A parabolic satellite communications antenna at Erdfunkstelle Raisting, the biggest facility for satellite communication in the world, in Raisting, Bavaria, Germany. It has a Cassegrain type feed. A parabolic antenna is an antenna that uses a… …   Wikipedia

  • Discone antenna — Mounted discone antenna designed for VHF and UHF coverage …   Wikipedia

  • Horn antenna — Pyramidal microwave horn antenna, with a bandwidth of 0.8 to 18 GHz. A coaxial cable feedline attaches to the connector visible at top. This type is called a ridged horn; the curving fins visible inside the mouth of the horn increase the antenna… …   Wikipedia

  • Rhombic antenna — signal gathering action compared to other end fire, backfire and traveling wave types. A rhombic antenna is a broadband directional antenna co invented by Edmond Bruce and Harald Friis,[1] mostly commonly used in HF (high frequency, also called… …   Wikipedia