What is the impedance of monopole antenna?
What is the impedance of monopole antenna?
Gain and Radiation Pattern Gain of monopole antenna on large ground plane (> λ) is greater than that of dipole antenna and it approaches to gain of around 5 dB, which is for infinite ground plane.
What is the input impedance of a quarter wavelength monopole antenna?
The impedance of the quarter-wave antenna is 36 Ohms, which is half the impedance of a dipole antenna.
What is the radiation resistance of monopole antenna?
As the radiated power is limited to upper hemisphere of the ground plane, the total radiated power of the quarter-wave monopole is half of that of a dipole. Hence, the value of radiation resistance of the monopole is half of that of a dipole.
Where is monopole antenna used?
The quarter-wave whip and rubber ducky antennas used with handheld radios such as walkie-talkies and portable FM radios are also monopole antennas.
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. Dipoles tend to be more common.
How does a monopole antenna work?
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.
For a monopole antenna, the reference plane of the transmission line connection, outer conductor of a coaxial cable, is the ground plane of the monopole. Both monopole and dipole antennas exhibit similar radiation patterns and performance, except that monopole antennas are not symmetric vertically.
What is the gain of a monopole antenna?
This new structure is called a monopole antenna. The impedance of the quarter wave monopole is 50Ω. The vertical antenna is omni-directional. Because all the radiated power is now concentrated in the half-space above the ground plane, the gain of the monopole is 3 dB larger than the gain of the dipole.
What is a 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.
