loaden antenna - translation to ελληνικό
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loaden antenna - translation to ελληνικό

TYPE OF RADIO ANTENNA
Marconi antenna; Rod antenna; Quarter-wave antenna; Blade antenna
  • VHF ground plane antenna, a type of monopole antenna used at high frequencies. The three conductors projecting downward are the ground plane
  •  2 }} wavelength }} long have a single "lobe", with field strength declining monotonically from a maximum in the horizontal direction, but longer monopoles have more complicated patterns with several conical "lobes" (radiation maxima) directed at angles into the sky.

loaden antenna      
φορτισμένη κεραία
aerial wire         
  • base station]] antennas
  • The wave reflected by earth can be considered as emitted by the image antenna.
  •  The currents in an antenna appear as an image in ''opposite'' phase when reflected at grazing angles. This causes a phase reversal for waves emitted by a horizontally polarized antenna (center) but not for a vertically polarized antenna (left).
  • θ}} = 0 .
  • Film on working of antenna
  • Electronic symbol for an antenna
  • Typical center-loaded mobile CB antenna with [[loading coil]]
  • An automobile's [[whip antenna]], a common example of an omnidirectional antenna.
  • I}}</span>) whose width is proportional to the amplitude of the quantity at that point on the antenna.
  • Diagram of the [[electric field]]s (''<span style="color:blue;">'''blue'''</span>'') and [[magnetic field]]s (''<span style="color:red;">'''red'''</span>'') radiated by a [[dipole antenna]] ('' '''black''' rods'') during transmission.
  • Half-wave [[dipole antenna]]
  • Polar plots of the horizontal cross sections of a (virtual) Yagi-Uda-antenna. Outline connects points with 3&nbsp;dB field power compared to an ISO emitter.
  • df=dmy-all}}</ref>
ELECTRICAL DEVICE WHICH CONVERTS ELECTRIC POWER INTO RADIO WAVES, AND VICE VERSA
Antenna theory; Radio antenna; Antennas; Antenna (electronics); Antenna (astronomy); Antena (radio); Antenna (electromagnetism); Radio antennas; External removable antenna; External antenna; TV Aerial; Radio antennae; Radio Antenna; Aerial Wire; Polarization (antenna); Aerial (radio); Polarization (antennas); Antenna bandwidth; GP antenna; Antenna polarization; Antennas (radio)
σύρμα κεραίας
φορτισμένη κεραία      
loaden antenna

Ορισμός

antennule
[an't?nju:l]
¦ noun Zoology a small antenna, especially either of the first pair of antennae in a crustacean.

Βικιπαίδεια

Monopole antenna

A monopole antenna is a class of radio antenna consisting of a straight rod-shaped conductor, often mounted perpendicularly over some type of conductive surface, called a ground plane. The driving signal from the transmitter is applied, or for receiving antennas the output signal to the receiver is taken, between the lower end of the monopole and the ground plane. One side of the antenna feedline is attached to the lower end of the monopole, and the other side is attached to the ground plane, which is often the Earth. This contrasts with a dipole antenna which consists of two identical rod conductors, with the signal from the transmitter applied between the two halves of the antenna.

The monopole is often used as a resonant antenna. The rod functions as an open resonator for radio waves and oscillates with standing waves of voltage and current along its length. The length of the antenna, therefore, is determined based on the wavelength of the desired radio waves. The most common form is the quarter-wave monopole, in which the antenna length is approximately one quarter of the wavelength of the radio waves. In broadcasting monopole antennas, however, a length equal to 5/8 = 0.625×wavelength are also popular because at this length a monopole radiates a maximum amount of its power in horizontal directions. The monopole antenna was invented in 1895 by radio pioneer Guglielmo Marconi; for this reason it is sometimes called the Marconi antenna.

The load impedance of the quarter-wave monopole is half that of the dipole antenna or 37.5 Ohms.

Common types of monopole antenna are