How do you calculate antenna gain?
Gain is calculated by comparing the measured power transmitted or received by the antenna in a specific direction to the power transmitted or received by a hypothetical ideal antenna in the same situation.
How is monopole antenna length calculated?
Use the formula: Length (feet) = 234 / Frequency (MHz). For example, if you intend to operate on 14.2 Megahertz (in the 20-Meter amateur radio band): 234 / 14.2 = 16.5 feet (rounded to nearest 0.1 foot). Your 14.2 MHz quarter wavelength wire monopole ham radio antenna needs to be 16.5 feet in length.
What is antenna length?
A half-wave dipole antenna has a length that is one-half of the fundamental wavelength (Figure 1). It is broken into two quarter-wave lengths called elements. The elements are set at 180 degrees from each other and fed from the middle.
Is a whip antenna a monopole?
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.
Why do we use monopole antenna?
The monopole is often used as a resonant antenna; the rod functions as an open resonator for radio waves, oscillating with standing waves of voltage and current along its length. Therefore the length of the antenna is determined by the wavelength of the radio waves it is used with.
What is the difference between a monopole and dipole antenna?
In essence, the difference between a monopole and dipole antenna, is that a dipole antenna uses an additionally radiator to generate a synthetic ground plane between the symmetric radiator elements, where a monopole antenna requires a physical ground plane.
How do you calculate dipole antenna?
The formula to calculate the length of the antenna is 147/frequency in MHz, this gives the total length of the dipole in metres. For example, to make a 150MHz dipole: 147/150 = 98cm so each element of the dipole should be 49cm.
What is the mean of monopole antenna?
A 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.
What is a dipole TV antenna?
Dipole means “two poles,” and is typically the simplest type of antenna, such as the familiar “rabbit ears” on a television. Multiband refers to radio communications across frequencies reserved for uses such as air band, public services, marine band , and citizens band, television, and commercial radio transmissions.