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.
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13 Facts About Monopole antenna
2.
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.
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3.
Therefore the length of the Monopole antenna is determined by the wavelength of the radio waves it is used with.
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4.
The most common form is the quarter-wave monopole, in which the antenna is approximately one quarter of the wavelength of the radio waves.
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5.
The monopole antenna was invented in 1895 by radio pioneer Guglielmo Marconi; for this reason it is sometimes called the Marconi antenna.
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6.
Monopole antenna was invented in 1895 and patented in 1896 by radio pioneer Guglielmo Marconi during his historic first experiments in radio communication.
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7.
Monopole antenna found by experiment that if instead of the dipole, one side of the transmitter and receiver was connected to a wire suspended overhead, and the other side was connected to the Earth, he could transmit for longer distances.
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8.
Up to a length of a half-wavelength the Monopole antenna has a single lobe with maximum gain in horizontal directions, perpendicular to the Monopole antenna axis.
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9.
The Monopole antenna is resonant at this length, so its input impedance is purely resistive.
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10.
Gains given in this section are only achieved if the Monopole antenna is mounted over a perfectly conducting infinite ground plane.
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11.
Since at this length the Monopole antenna has a current node at its feedpoint, the input impedance is very high.
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12.
At lower frequencies the antenna mast is electrically short giving it a very small radiation resistance, so to increase efficiency and radiated power capacitively toploaded monopoles such as the T-antenna and umbrella antenna are used.
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13.
The monopole element is bent over parallel to the ground area on the circuit board, so it can be enclosed in the device case; usually the antenna is fabricated of copper foil on the printed circuit board itself.
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