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  2. Gain (antenna) - Wikipedia

    en.wikipedia.org/wiki/Gain_(antenna)

    When considering an antenna's directional pattern, gain with respect to a dipole does not imply a comparison of that antenna's gain in each direction to a dipole's gain in that direction. Rather, it is a comparison between the antenna's gain in each direction to the peak gain of the dipole (1.64). In any direction, therefore, such numbers are 2 ...

  3. Effective radiated power - Wikipedia

    en.wikipedia.org/wiki/Effective_radiated_power

    The difference between ERP and EIRP is that antenna gain has traditionally been measured in two different units, comparing the antenna to two different standard antennas; an isotropic antenna and a half-wave dipole antenna: Isotropic gain is the ratio of the power density (signal strength in watts per square meter) received at a point far from ...

  4. Dipole antenna - Wikipedia

    en.wikipedia.org/wiki/Dipole_antenna

    For a gain measured relative to a dipole, one says the antenna has a gain of " x dBd" (see Decibel). More often, gains are expressed relative to an isotropic radiator, making the gain seem higher. In consideration of the known gain of a half-wave dipole, 0 dBd is defined as 2.15 dBi; all gains in "dBi" are shifted 2.15 higher than gains in "dBd".

  5. Free-space path loss - Wikipedia

    en.wikipedia.org/wiki/Free-space_path_loss

    Free-space loss increases with the square of distance between the antennas because the radio waves spread out by the inverse square law and decreases with the square of the wavelength of the radio waves. The FSPL is rarely used standalone, but rather as a part of the Friis transmission formula, which includes the gain of antennas. [3]

  6. Antenna measurement - Wikipedia

    en.wikipedia.org/wiki/Antenna_measurement

    An antenna designer must take into account the application for the antenna when determining the gain. High-gain antennas have the advantage of longer range and better signal quality, but must be aimed carefully in a particular direction. Low-gain antennas have shorter range, but the orientation of the antenna is inconsequential.

  7. Antenna types - Wikipedia

    en.wikipedia.org/wiki/Antenna_types

    A directive antenna with moderate gain of about 8 dBi often used at UHF frequencies. Consists of a dipole mounted in front of two reflective metal screens joined at an angle, usually 90°. Used as a rooftop UHF television antenna and for point-to-point data links. Parabolic The most widely used high gain antenna at microwave frequencies and above.

  8. Horn antenna - Wikipedia

    en.wikipedia.org/wiki/Horn_antenna

    A type of antenna that combines a horn with a parabolic reflector is known as a Hogg-horn, or horn-reflector antenna, invented by Alfred C. Beck and Harald T. Friis in 1941 [20] and further developed by David C. Hogg at Bell Labs in 1961. [21]

  9. Monopole antenna - Wikipedia

    en.wikipedia.org/wiki/Monopole_antenna

    The radio wave power radiated by an antenna is proportional to the square of the antenna ... into half the space of a dipole antenna, its gain ... rate that can be ...

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