Two long thin growths on the heads of insects, crustaceans etc They are often called feelers Animals might use their antennae to feel, smell, taste and even to hear Ants and butterflies have antennae
An antenna is a device used to transmit and/or receive radio waves The physical design of the antenna determines the frequency range of transmission/reception
A conductive structure specifically designed to couple or radiate electromagnetic energy In RFID systems, the antenna may be used to both transmit and receive electromagnetic energy
A piece of equipment that allows transmission and reception of radio signals Satellites need antennas to communicate with Earth A satellite may need to receive instructions and transmit the information it collects, or it may relay the information sent to it to another site on Earth Since the information is transmitted using radio waves, which move at the speed of light, this method allows for very fast communications (only a very small time lag)
A conductive structure specifically designed to couple or radiate electromagnetic energy In a driven mode the structure is a transmitter antenna In receiver mode the structure is a receiver antenna Antenna structures, often encountered in radio frequency identification systems, may be used to both transmit and receive electromagnetic energy, particularly data modulated electromagnetic energy See also dipole
a device connected to a transmitter to radiate electromagnetic energy during transmission or a device connected to a receiver to collect such energy during reception
An aerial for receiving or transmitting radio signals A high gain antenna is highly focused, whereas a low gain antenna receives or transmits over a wide angle
A physical device for sending or receiving radio signals Antennas come in a variety of shapes and sizes Some wireless phones contain built-in antennas Many phone owners also use car antennas to boost reception and transmission
(communications usage) The basic element of a satellite receive site; a parabolic dish-shaped device that is either fixed (locked onto a particular satellite), steerable (able to "look at" more than one satellite of the same sort), or even dual (able to receive both C- and Ku-Band signals, one at a time or both simultaneously)
An Antenna is any device used for transmitting signals Antennas come in all shapes and sizes, their size and shape depending on the frequency and use of the signal transmitted Some antennas can broadcast signals in all directions, they are called omnidirectional antennas Other antennas can also broadcast signals in a fine straight line - like a flashlight, they are called directional antennas Electrical signals with frequencies higher on the spectrum, for example, are shorter and more directional As they get higher on the spectrum, they behave more like light These must be focused and thus, require antennas which are shaped like the mirror reflector of a focusing flashlight This parabolic shape focuses the broad beam (of the bulb or the electrical signal), into a narrow, focused beam The weaker the received signal the bigger the antenna must be
The part of a radio system that is designed to radiate electromagnetic waves into free space (or to receive them) This does not include the transmission lines or waveguide to the radiator
In the case of Radar, an electromechanical device for the concentrating of radio frequency energy into a beam of known and predictable direction An antenna can be used for the concentrating of energy transmitted from or received at the antenna Typically the beam shape in either the transmit or receive directions shall be very similar (assuming the same or similar transmitted and received frequencies and beam polarisation) The concentration of radio frequency energy may occur in both the azimuth and elevation planes Normally, but not always, an air traffic control radar antenna is mounted upon a rotating platform such that it can scan a volumetric airspace through 360 deg of azimuth However, static electronically scanned radar antennas also exist
A device for transmitting or receiving radio waves Also known as aerial In satellite communication systems the antenna usually consists of a parabolic reflector and a feedhorn In a receiving system the reflector focuses radio waves onto the feedhorn for detection and conversion into electrical signals In a transmitting systems the reflector concentrates the radio waves emitted by the feedhorn into a narrow beam aimed towards the satellite
A device for transmitting and/or receiving signals The size and shape of antennas are determined, in large part, by the frequency of the signal they are receiving (Back to top )
Thales Navigation offers a variety of global navigation satellite antennas designed to pick up navigation satellite signals Antennas range from simpler microstrip devices to complex choke ring antennas that mitigate the effects of multipath scattering sometimes caused when signals are reflected off tall buildings, cliffs, mountains or other localized terrain
insects and crustaceans; typically sensitive to touch and taste an electrical device that sends or receives radio or television signals sensitivity similar to that of a receptor organ; "he had a special antenna for public relations
An antenna is a device that sends and receives television or radio signals. = aerial. or aerial Component of radio, television, and radar systems that directs incoming and outgoing radio waves. Usually of metal, antennas range in shape and size from the mastlike devices used for radio and television broadcasting to the large parabolic reflectors used to focus satellite signals and the radio waves generated by distant astronomical objects and reflect them toward the centrally located receiver. Antennas were invented in the 1880s by Heinrich Hertz; Guglielmo Marconi made many improvements. In zoology, one of a pair of slender, segmented sensory organs on the head of insects, myriapods (e.g, centipedes, millipedes), and crustaceans. Antennae of insects, which are movable, are believed to serve as both tactual and smell receptors; in some species, the development of elaborate antennal plumes and brushlike terminations has led to the suggestion that they also serve for hearing. Evidence supports this idea only for the mosquito, whose antennae are attached to specialized structures stimulated by vibrations of the antennal shaft. In social insects (e.g., ants), antennae movements may serve as communication