Radio frequency antenna types Radio frequency antenna types A biconical antenna consists of an arrangement of two conical conductors, which is driven by potential, charge, or a alternating magnetic field (and the associated alternating electric current) at the vertex. The conductors have a common axis and vertex. The two cones face in opposite directions. Biconical antennas are broadband dipole antennas transceiving signals from 30 MHz to 300 MHz. ...more on Wikipedia about "Biconical antenna"
In telecommunications, a billboard antenna, also called a broadside antenna, is an array of parallel antennas with flat reflectors, usually positioned in a line or plane. The spacing and dimensions of the dipoles depend on the wavelength. The main lobe of a fixed billboard antenna may, within limits, be steered by appropriate phasing of the respective signals to individual elements of the array. ...more on Wikipedia about "Billboard antenna"
A cantenna is a directional waveguide antenna for long-range Wi-Fi (compare hi-fi) used to increase the range of (or snoop on) a wireless network. Originally built using a Pringles potato chip can, a cantenna can be constructed quickly, easily, and inexpensively using readily obtained materials: ...more on Wikipedia about "Cantenna"
In telecommunications and radar, a Cassegrain antenna is an antenna in which the feed radiator is mounted at or near the surface of a concave main reflector and is aimed at a convex secondary reflector slightly inside the focus of the main reflector. ...more on Wikipedia about "Cassegrain antenna"
In telecommunication, a collinear antenna array is an array of dipole antennas mounted in such a manner that every element of each antenna is in an extension, with respect to its long axis, of its counterparts in the other antennas in the array. ...more on Wikipedia about "Collinear antenna array"
In optics and telecommunication, the term corner reflector has the following meanings: ...more on Wikipedia about "Corner reflector"
A Crossed field antenna is a new type of antenna for long and mediumwave broadcasting, which is claimed to have the same efficiency as a conventional antenna but only one-tenth the overall height. However, claims made for this efficiency by the antenna's inventors have not yet been proven by independent observers. ...more on Wikipedia about "Crossed field antenna" shortopedia Dreamteam.
A dipole antenna, invented by Heinrich Rudolph Hertz around 1886, is an antenna with a center-fed driven element for transmitting or receiving Radio frequency energy. These antennas are the simplest practical antennas from a theoretical point of view. ...more on Wikipedia about "Dipole antenna"
A directional antenna is an antenna which transmits or receives maximum power in a particular direction. ...more on Wikipedia about "Directional antenna"
A discone antenna is a version of a biconical antenna where one of the cones is replaced by a disc. It is usually mounted in vertical orientation, with the disc at the top and the cone under it. It may be made of solid metal sheets, which is practical for small indoor high-frequency antennas, such as for Wi-Fi, or of discrete metal elements assembled to a "star" at the top and a cone of beams going down from the star's center, which makes it less vulnerable to wind. The cone and the disc are separated by an insulator. ...more on Wikipedia about "Discone antenna"
Evolved antennas are antennas designed fully or substantially by an automatic design procedure mimicking Darwinian evolution. The first evolved antenna designs appeared in the mid-1990's from the work of Michielssen, Altshuler, Linden, Haupt, and Rahmat-Samii. Most practioners use the genetic algorithm or some variant thereof to evolve antenna designs. ...more on Wikipedia about "Evolved antenna"
In satellite dish and antenna design parlance, a feedhorn (or feed horn) is a horn antenna used to convey radio waves between the transceiver ( transmitter and/or receiver) and the reflector. ...more on Wikipedia about "Feed horn"
The AN/FLR-9 is a type of very large circular " Wullenweber" antenna array, built at many locations during the cold war to gather signals for western signals intelligence (SIGINT). The world-wide network, known collectively as "Iron Horse", could eavesdrop on HF communications from almost anywhere on the planet. ...more on Wikipedia about "FLR-9"
A fractal antenna is an antenna that uses a self similar design to maximize the length, or increase the perimeter (on inside sections or the outer structure), of material that can receive or transmit electromagnetic signals within a given total surface area. For this reason, fractal antennas are very compact, are multiband or wideband, and have useful applications in cellular telephone and microwave communications. ...more on Wikipedia about "Fractal antenna"
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A helical antenna is an antenna consisting of a conducting wire wound in the form of a helix. In most cases, helical antennas are mounted over a ground plane. Helical antennas can operate in one of two principal modes: normal (broadside) mode or axial (or endfire) mode. ...more on Wikipedia about "Helical antenna"
The High Gain Antenna (HGA) is an antenna with a focused, narrow radiowave beam width. This narrow beam width allows for more precise targeting of where you want the radio signal to go - also known as a directional antenna. Most commonly referred to during space missions, these antennas are also in use all over Earth, most successfully in flat, open areas where no mountains lie to disrupt radiowaves. ...more on Wikipedia about "High Gain Antenna"
A horn antenna is used for the transmission and reception of microwave signals. It derives its name from the characteristic flared appearance. The flared portion can be square, rectangular, or conical. The maximum radiation and response corresponds with the axis of the horn. In this respect, the antenna resembles an acoustic horn. It is usually fed with a waveguide. ...more on Wikipedia about "Horn antenna"
In telecommunication, an image antenna is a hypothetical mirror-image, that is, a virtual-image, of an antenna, that is, antenna element, considered to extend as far below ground, that is, the ground plane, as the actual antenna is above the ground plane. ...more on Wikipedia about "Image antenna"
An isotropic antenna is an ideal antenna that radiates power with unit gain uniformly in all directions and is often used to reference antenna gains in wireless systems. There is no actual physical isotropic antenna; a close approximation is a stack of two pairs of crossed dipole antennas driven in quadrature. The radiation pattern for the isotropic antenna is a sphere with the antenna at its center. ...more on Wikipedia about "Isotropic antenna"
In telecommunication, a log-periodic antenna (LP, also known as a log-periodic array) is a broadband, multielement, unidirectional, narrow- beam antenna that has impedance and radiation characteristics that are regularly repetitive as a logarithmic function of the excitation frequency. The individual components are often dipoles, as in a log-periodic dipole array (LPDA). ...more on Wikipedia about "Log-periodic antenna"
The Low Gain Antenna (LGA) is an antenna with a broad radiowave beam width. This very wide beam allows for a more reliable signal that is best used in mountainous regions, where the signal will propagate reasonably well regardless of terrain. The mountains become the equivalent of rocks in a stream, surrounded by the flowing waves. Low gain antennas are often used in spacecraft as a backup to the High Gain Antenna, which transmits a much narrower beam and is therefore susceptible to loss of signal. ...more on Wikipedia about "Low Gain Antenna"
Magnetic loop antennas (also known as Small Transmitting Loops) have a small antenna size compared to other antennas for the same wavelength. The antenna is typically smaller than 1/4 wavelength of the intended frequency of operation. Antennas for shortwave communication are normally very large sometimes covering hundreds of feet or meters in length. The advantage of the magnetic loop is that with its small size it maintains very high efficiency levels. ...more on Wikipedia about "Magnetic loop"
In telecommunication, There are several types of microstrip antennas (also known as a 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 etching the antenna element pattern in metal trace bonded to an insulating substrate. Because such antennas have a very low profile, are mechanically rugged and can be conformable, they are often mounted on the exterior of aircraft and spacecraft, or are incorporated into mobile radio communications devices. ...more on Wikipedia about "Microstrip antenna"
An offset antenna is a type of satellite dish. It is so called because the antenna feed is offset to the side of the reflector, in contrast to a typical circular parabolic antenna where the feed is in front of the center of the reflector. ...more on Wikipedia about "Offset antenna"
An omnidirectional antenna is an antenna system which radiates power uniformly in all directions. ...more on Wikipedia about "Omnidirectional antenna"
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