The radiation pattern of a dipole in three dimensions (Figure 5.20b) resembles a donut and is often referred to as the donut-shaped radiation pattern. The polarization is linear. An ideal dipole antenna, away from any conducting or dielectric materials, can be approximately modeled by a 73 Ohm resistor.
Is a dipole antenna omnidirectional?
Commonly known as an omnidirectional antennas, all dipole antennas have a generalized radiation pattern. … The dipole antenna is not a directive antenna, since its power is radiated 360 degrees around the antenna (one of the reasons for FCC power gain limitations).
Can a dipole antenna be curved?
One way to fit a dipole antenna in a restricted space is to bend the legs. They can be bent horizontally, drooped downward, or any other imaginable configuration to fit in the space available.
Why it is called dipole antenna?
A dipole antenna is the simplest type of radio antenna, consisting of a conductive wire rod that is half the length of the maximum wavelength the antenna is to generate. This wire rod is split in the middle, and the two sections are separated by an insulator. … Dipole means “two poles.”
What are the two types of radiation pattern?
Two types of radiation patterns should be distinguished: 1) the free space radiation pattern that is the complete lobe pattern of the antenna and is a function of the wavelength, feed system, and reflector characteristics; and 2) the field radiation pattern that differs primarily from the free space pattern by the …
Does a dipole antenna have to be straight?
Dipole antennas need not be installed in a horizontal straight line. They are generally tolerant of bending, sloping or drooping as required by the antenna site. Remember, however, that dipole antennas are RF conductors. … (So does the coax shield, unless it is routed at 90° from the antenna.)