This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations.(July 2018) (Learn how and when to remove this message)
Part of a series on
Antennas
Common types
Dipole
Fractal
Loop
Monopole
Satellite dish
Television
Whip
Components
Balun
Block upconverter
Coaxial cable
Counterpoise (ground system)
Feed
Feed line
Low-noise block downconverter
Passive radiator
Receiver
Rotator
Stub
Transmitter
Tuner
Twin-lead
Systems
Antenna farm
Amateur radio
Cellular network
Hotspot
Municipal wireless network
Radio
Radio masts and towers
Wi-Fi
Wireless
Safety and regulation
Wireless device radiation and health
Wireless electronic devices and health
International Telecommunication Union (Radio Regulations)
World Radiocommunication Conference
Radiation sources / regions
Boresight
Focal cloud
Ground plane
Main lobe
Near and far field
Side lobe
Vertical plane
Characteristics
Array gain
Directivity
Efficiency
Electrical length
Equivalent radius
Factor
Friis transmission equation
Gain
Height
Radiation pattern
Radiation resistance
Radio propagation
Radio spectrum
Signal-to-noise ratio
Spurious emission
Techniques
Beam steering
Beam tilt
Beamforming
Small cell
Bell Laboratories Layered Space-Time (BLAST)
Massive Multiple-input multiple-output (MIMO)
Reconfiguration
Spread spectrum
Wideband Space Division Multiple Access (WSDMA)
v
t
e
A radio transmitter or receiver is connected to an antenna which emits or receives the radio waves. The antenna feed system or antenna feed is the cable or conductor, and other associated equipment, which connects the transmitter or receiver with the antenna and makes the two devices compatible.[1][2] In a radio transmitter, the transmitter generates an alternating current of radio frequency, and the feed system feeds the current to the antenna, which converts the power in the current to radio waves. In a radio receiver, the incoming radio waves excite tiny alternating currents in the antenna, and the feed system delivers this current to the receiver, which processes the signal.
To transfer radio frequency current efficiently, the feedline connecting the transmitter or receiver to the antenna must be a special type of cable called transmission line. At microwave frequencies, waveguide is often used, which is a hollow metal pipe carrying radio waves. In a parabolic (dish) antenna the feed is usually also defined to include the feed antenna (feed horn) which emits or receives the radio waves. Particularly in transmitters, the feed system is a critical component which impedance matches the antenna, feedline, and transmitter. To accomplish this, the feed system may also include circuits called antenna tuning units or matching networks between the antenna and feedline and the feedline and transmitter.[3] On an antenna the feed point is the point on the driven antenna element at which the feedline is connected.
^Su, Donglin; Xie, Shuguo; Dai, Fei (2019). Theory and Methods of Quantification Design on System-Level Electromagnetic Compatibility. Springer. pp. 54–55. ISBN 9789811336904.
^Basu, Dipak (2018). Dictionary of Pure and Applied Physics. CRC Press. p. 28. ISBN 9781420050226.
^Straw, R. Dean (2000). The ARRL Antenna Book, 19th Ed. American Radio Relay League. pp. 25.1–25.8. ISBN 9780872598041.
or receiver is connected to an antenna which emits or receives the radio waves. The antennafeed system or antennafeed is the cable or conductor, and...
located at the feed point. An advantage of parabolic antennas is that most of the structure of the antenna (all of it except the feedantenna) is nonresonant...
widely used as antennas at UHF and microwave frequencies, above 300 MHz. They are used as feedantennas (called feed horns) for larger antenna structures...
In telecommunications and radar, a Cassegrain antenna is a parabolic antenna in which the feedantenna is mounted at or behind the surface of the concave...
Antenna feed, the components of an antenna which feed the radio waves to the rest of the antenna structure Data feed, a mechanism for users to receive...
In radio systems, many different antenna types are used whose properties are especially crafted for particular applications. Most often, the greatest...
systems send out a signal slightly to one side of the antenna's boresight and then rotate the feed horn to make the lobe rotate around the boresight line...
A feed horn (or feedhorn) is a small horn antenna used to couple a waveguide to e.g. a parabolic dish antenna or offset dish antenna for reception or transmission...
to the feed line anywhere between the transmitter and the antenna, or a combination of several of these. In transmitting systems with an antenna distant...
them, including the monopole) are used to feed more elaborate directional antennas such as a horn antenna, parabolic reflector, or corner reflector....
centered in a 305 m (1,000 ft) reflector to support an antennafeed. He proposed that this antenna would "be fed from a horn on a high tower." Gordon also...
a balun. If a coil is made using coaxial cable near to the feed point of a balanced antenna, then the RF current that flows on the outer surface of the...
waves. The individual antennas (called elements) are usually connected to a single receiver or transmitter by feedlines that feed the power to the elements...
A whip antenna is an antenna consisting of a straight flexible wire or rod. The bottom end of the whip is connected to the radio receiver or transmitter...
A turnstile antenna, or crossed-dipole antenna, is a radio antenna consisting of a set of two identical dipole antennas mounted at right angles to each...
A television antenna (TV aerial) is an antenna specifically designed for use with a television receiver (TV) to receive over-the-air broadcast television...
design, the conventional "front fed" parabolic antenna. In front feed, the antennafeed, the small antenna that transmits or receives the radio waves reflected...
The folded unipole antenna is a type of monopole mast radiator antenna used as a transmitting antenna mainly in the medium wave band for AM radio broadcasting...
In telecommunication, a microstrip antenna (also known as a printed antenna) usually is an antenna fabricated using photolithographic techniques on a...
small aperture terminal (VSAT) antennafeed or a terrestrial microwave radio feed; for example, OMTs are often used with a feed horn to isolate orthogonal...
for receiving feeds a balanced load. Within this physical description there are two (possibly three) distinct types: Large loop antennas Large loops are...
overall diameter of 0.7 times a quarter wavelength of the antenna's lowest frequency. The antenna'sfeed point is at the center of the disc. It is usually fed...
directional antenna or beam antenna is an antenna which radiates or receives greater radio wave power in specific directions. Directional antennas can radiate...
50 Ω (ohm) coax to an 800 Ω feed at the antenna. The resistor load is also 800 Ω, non-inductive. This allows the antenna impedance to swing from 400–1...
in the radio or microwaves domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver...
does for light. Typically it consists of a small feedantenna such as a patch antenna or horn antenna which radiates radio waves, with a piece of dielectric...
Global Information
