monopole antenna वाक्य
उदाहरण वाक्य
मोबाइल
- The monopole antenna is essentially one half of the half-wave dipole, a single-wavelength element with the other side connected to ground or an equivalent ground plane ( or " counterpoise " ).
- For example, a monopole antenna such as a metal rod fed at one end, will be resonant when its electrical length is equal to a quarter wavelength, " ? " / 4, of the frequency used.
- Also, in the particular case of a monopole antenna, the ground ( or an artificial ground plane ) serves as the return connection for the antenna current thus having an additional effect, particularly on the impedance seen by the feed line.
- This led to the 1919 introduction of the Adcock antenna ( UK Patent 130, 490 ), which consisted of four separate monopole antennas instead of two loops, eliminating the horizontal components and thus filtering out the sky waves being reflected down from the ionosphere.
- Because it radiates only into the space above the ground plane, or half the space of a dipole antenna, a monopole antenna will have a dBi and a radiation resistance of about 36.8 ohms if it is mounted above a good ground plane.
- In a long series of experiments Marconi found that by using an elevated wire monopole antenna instead of Hertz's dipole antennas he could transmit longer distances, beyond the curve of the Earth, demonstrating that radio was not just a laboratory curiosity but a commercially viable communication method.
- The whip antenna is a monopole antenna, and like a vertical dipole has an omnidirectional radiation pattern, radiating equal radio power in all azimuthal directions ( perpendicular to the antenna's axis ), with the radiated power falling off with elevation angle to zero on the antenna's axis.
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