Table of Contents
What is the radiation pattern of a monopole antenna?
Like a vertically suspended dipole antenna, a monopole has an omnidirectional radiation pattern: It radiates with equal power in all azimuthal directions perpendicular to the antenna. The radiated power varies with elevation angle, with the radiation dropping off to zero at the zenith on the antenna axis.
How is loop antenna calculated?
The formulas for calculating the approximate length of a full-wave loop antenna are: Full-wave loop in feet = 1005 / frequency in MHz. Full-wave in meters = 306 / frequency in MHz.
How is Hpbw calculated?
The Half Power Beamwidth (HPBW) is the angular separation in which the magnitude of the radiation pattern decrease by 50% (or -3 dB) from the peak of the main beam. From Figure 2, the pattern decreases to -3 dB at 77.7 and 102.3 degrees. Hence the HPBW is 102.3-77.7 = 24.6 degrees.
What is the radiation pattern of a monopole?
Like a dipole antenna, a monopole has an omnidirectional radiation pattern: it radiates with equal power in all azimuthal directions perpendicular to the antenna. However, the radiated power varies with elevation angle, with the radiation dropping off to zero at the zenith of the antenna axis. It radiates vertically polarized radio waves.
How do you find the radiation impedances of a monopole antenna?
For example, if the length of the monopole antenna L − λ 0 /4, such that the corresponding length of the equivalent dipole antenna is λ 0 /2, the following values of the radiation impedances result: (6.168) Z monopole = 1 2 Z dipole = 36.5 Ω; Z foldedmonopole = 1 2 Z foldeddipole = 146 Ω.
Why is the directivity of a monopole antenna twice the length?
That is, the directivity (in linear units) of a monopole antenna is twice the directivity of a dipole antenna of twice the length. The reason for this is simply because no radiation occurs below the ground plane; hence, the antenna is effectively twice as “directive”.
What is an example of a monopole antenna?
Examples of monopole antennas are: the whip antenna the mast radiator (when isolated from the ground and bottom-fed)