What does Dipole Antenna mean?

| 2019 11 11 | Comments | View Num: 650

Definition - What does Dipole Antenna mean?

Dipole antenna is the simplest type of radio antenna, consisting of a conductive wire rod that is half length of the maximum wavelength the antenna is to generate. This wire rod split in the middle, and two sections are separated by an insulator. Each rod is connected to the coaxial cable at the end closest to the middle of the antenna.

Radio frequency voltage is applied to dipole antennas at the center, between the two conductors. They are used as antennas, especially in rabbit-ear television antennas and as the driven elements in other types of antennas.

The Dipole means "two poles".

Techopedia: explains Dipole Antenna

Dipole provides the best performance if it is more than a half-wavelength above the ground, surface of a body of water or horizontal conducting medium such as sheet-metal roofing. The element should also be a certain wavelength away from electrically conducting obstructions such as utility wires, supporting towers and other antennas.

Dipole antennas are oriented vertically, in slant or horizontally . Polarization of electromagnetic fields radiated by dipole-transmitting antennas correspond to element orientation. Radio frequency current in dipoles is  at its minimum at ends of the element and at its maximum at the centers of the dipole , and vice versa for RF voltages.

Dipole antennas were invented by a German physicist named Heinrich Hertz in 1886. They are also referred to as a doublet and make up the main RF radiating and receiving element in different sophisticated type of antennas. Dipole antennas are balanced in that they are bilaterally symmetrical and fed with balanced, parallel wire RF transmission lines.

 

There are three types of dipoles:

  • Ideal half-wavelength dipole

  • Hertzian dipole

  • Folded dipole

Superbat Antennas: www.rfsupplier.com

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