what is antennas
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- An antenna (plural antennae or antennas), or aerial, is an electrical device which converts electric power into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver.
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Transmitter Transmitters are devices that are used to send out data as radio waves in a specific band of the electromagnetic spectrum in order to fulfill a specific communication need, be it for voice or for general data.
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Radar Basics Phased Array Antenna A phased array antenna is composed of lots of radiating elements each with a phase shifter. Beams are formed by shifting the phase of the signal emitted from each radiating element, to provide constructive/destructive interference so as to steer the beams in the desired direction.
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- A directional antenna, as the name implies, focuses the wireless signal in a specific direction resulting in a limited. coverage area. An analogy for the radiation pattern would be how a vehicle head light illuminates the road. Examples of. directional antennas include Yagi, Parabolic grid, patch, and panel antenna styles.
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Parabolic antenna Parabolic antennas are also classified by the type of feed, that is, how the radio waves are supplied to the antenna: 1  Axial or front feed – This is the most common type of feed, with the feed antenna located in front of the dish at the focus, on the beam axis, pointed back toward the dish.n advantage of parabolic antennas is that most of the structure of the antenna (all of it except the feed antenna) is nonresonant, so it can function over a wide range of frequencies, that is a wide bandwidth.
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- Antenna term glossary Before we talk about speciﬁc antennas, there are a few common terms that must be deﬁned and explained: Input Impedance For an efﬁcient transfer of energy, the impedance of the radio, antenna, and transmission cable connecting them must be the same.
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Parabolic antenna Parabolic antennas are also classified by the type of feed, that is, how the radio waves are supplied to the antenna: 1  Axial or front feed – This is the most common type of feed, with the feed antenna located in front of the dish at the focus, on the beam axis, pointed back toward the dish.
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Introduction to Wi-Fi Wireless Antennas Some radio antennas are designed to work with signals in any direction. These omnidirectional antennas are commonly used on Wi-Fi routers and mobile adapters as such devices must support connections from multiple directions.
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Gain The gain of an antenna is the relative increase in radiation at the maximum point expressed as a value in decibels (dB) above a standard. The standard to which other antennas are compared is usually a ½-wavelength dipole. The standard antenna is given a reference gain of 0dBD (zero decibel referenced to dipole).
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- The purpose of a Wi-Fi antenna is to gather in the signals being transmitted so that a device can access a local network or Internet. Turn an old satellite dish, for example, a Direct TV satellite dish, into a powerful and efficient Wi-Fi antenna.
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Introduction to Wi-Fi Wireless Antennas The connection range of a Wi-Fi device depends greatly on its antenna's power gain. A numeric quantity measured in relative decibels (dB), gain represents the maximum effectiveness of an antenna compared to a standard reference antenna. Most Wi-Fi antennas have dBi as their standard measure rather than dBd.
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- Bow-Tie: This is a design of antenna typically used for UHF only antennas and is named that because the front of the antenna usually has elements that look like a bow-tie. Typically these antennas are square, or rectangular in shape, and have a metal mesh screen on the back of them.
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satellite In general, a satellite is anything that orbits something else, as, for example, the moon orbits the earth. In a communications context, a satellite is a specialized wireless receiver/transmitter that is launched by a rocket and placed in orbit around the earth. There are hundreds of satellites currently in operation.n a communications context, a satellite is a specialized wireless receiver/transmitter that is launched by a rocket and placed in orbit around the earth.
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distributed A distributed antenna system is a network of relatively small antennas installed throughout a building to serve as repeaters. A DAS is designed to overcome the problem of isolated spots of poor coverage inside a large building.
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- Often we will hear people describing their antennas as ‘just a dipole’. After all, a coax. cable fed, half wavelength dipole is one of the simplest antennas to construct and install. It must be an antenna only beginners use. If there is anything we might call a “magic” antenna in amateur radio, it is surely the half. wave dipole. A wire cut to about 95% of free space half wavelength at a desired. operating frequency and fed in the middle with 50 ohm coax will operate very efficiently.
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Radar More information about: Radar. Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. A radar transmits radio waves or microwaves that reflect from any object in their path. A receive radar, which is typically the same system as the transmit radar, receives and processes these reflected waves to determine properties of the object(s).
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Antennas At dyersonline.com we have a variety of antennas to suit your needs. Get crystal clear HD signal on your television for all the digital broadcast channels with no complicated installation with a simple antenna.
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Antenna (biology) Antennae (singular: antenna) in biology have historically been paired appendages used for sensing in arthropods. More recently, the term has also been applied to cilium structures present in most cell types of eukaryotes. In arthropods, antennae are connected to the front-most segments.In crustaceans, they are biramous and present on the first two segments of the head, with the smaller pair known as antennules. All other arthropod groups – except chelicerates and proturans, which have none – have a single, uniramous pair of antennae.n the groups with more uniform antennae (for example: millipedes), all segments are called antennomeres. Some groups have a simple or variously modified apical or subapical bristle called an arista (this may be especially well-developed in various Diptera).
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Very high frequency VHF television antennas used for broadcast television reception. These six antennas are a type known as a Yagi antenna, which is widely used at VHF. Very high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) from 30 MHz to 300 MHz, with corresponding wavelengths of ten to one meters.
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antenna Most antennae are organs of touch, but some are sensitive to odors and other stimuli. A metallic device for sending or receiving electromagnetic waves, such as radio waves. Some antennas can send waves in or receive waves from all directions; others are designed to work only in a range of directions.
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Definitions &Translations In reception, an antenna intercepts some of the power of an electromagnetic wave in order to produce a tiny voltage at its terminals, that is applied to a receiver to be amplified. Antennas are essential components of all equipment that uses radio.
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Antenna Arrays (Phased Arrays) An antenna array (often called a ' phased array ') is a set of 2 or more antennas. The signals from the antennas are combined or processed in order to achieve improved performance over that of a single antenna. The antenna array can be used to:
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AP Government FCC-an independent government agency that regulates interstate and international communications by radio and television and wire and cable and satellite.
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Television antenna A television antenna, or TV aerial, is an antenna specifically designed for the reception of over-the-air broadcast television signals, which are transmitted at frequencies from about 41 to 250 MHz in the VHF band, and 470 to 960 MHz in the UHF band in different countries.
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aerial combat definition, aerial combat meaning | English dictionary 7 (Also called) antenna the part of a radio or television system having any of various shapes, such as a dipole, Yagi, long-wire, or vertical aerial, by means of which radio waves are transmitted or received. (C17: via Latin from Greek aerios, from aer air). aerial ladder.
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In-Building Cellular Enhancement System An in-building cellular enhancement system, commonly implemented in conjunction with a distributed antenna system, is a telecommunications solution which is used to extend and distribute the cellular signal of a given mobile network operator within a building. In the United States, operators commonly supported by such solutions include AT&T Mobility, Verizon Wireless, Sprint Corporation, T-Mobile US, in addition to smaller regional carriers as required. Below ground level, large buildings and hi