an antenna that contains two different elements
an antenna with two driven elements
a narrowband antenna, operating efficiently in only a narrow band of frequencies
Unlike an isotropic antenna, a dipole antenna is a real antenna that has a 360° radiation pattern in the horizontal plane and a 75° radiation pattern in the vertical plane if the antenna is mounted vertically. This creates a doughnut shaped radiation pattern. Because the beam is slightly concentrated, dipole antennas have a gain over isotropic antennas of 2.14dbi in comparison to an isotropic antenna. Some antennas are rated in comparison to a dipole antenna which is denoted by dBd. So, dipole antennas have a gain of 0dBd in relation to itself which is equivalent to 2.14dBi. A half wave dipole antenna (.5dBd) is rated at 1dBi. A quarter wave dipole antenna (.25dBd) is rated at .5dBi).
The most common wire antenna. Length is equal to one-half of the wavelength for the frequency of operation. Fed by coaxial cable.
An antenna with length near a half wavelength
A two-piece (di = two; pole=“pole” or “piece”) antenna that is the basic “building block” antenna element. A dipole is normally used as the “driven element” in most antenna systems. A dipole is made up of two 1/4 wavelength-long antenna pieces arranged in a straight line. A coax transmission line feeds power to the middle of the dipole.
An antenna type that offers omnidirectional coverage, but not much gain. Access points usually have one or two dipole antennas to increase their gain slightly.
Any one of a class of antennas producing a pattern with a node or zero level at each end.
A center-fed wire antenna whose conductors are in a straight line. Usually a straight, center-fed, one-half wavelength antenna.
A dipole antenna, invented by Heinrich Rudolph Hertz around 1886, is an antenna with a center-fed driven element for transmitting or receiving radio frequency energy. These antennas are the simplest practical antennas from a theoretical point of view.
