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The most common form is the quarter-wave monopole, in which the antenna length is approximately one quarter of the wavelength of the radio waves. In broadcasting monopole antennas, however, lengths equal to 5 / 8 wavelength are also popular because in a monopole this length maximizes the power radiated perpendicular to the axis of the ...
The quarter wave antenna is a single element antenna fed at one end that behaves as a dipole antenna. It is formed by a conductor in length λ/4. It is fed in the lower end, which is near a conductive surface which works as a reflector.
The Quarter Wave Ground Plane is a very common, simple, and effective antenna. Generally it consists of a quarter wave vertical radiator connected to the center of the coax feeder, and 4 radials, often sloping downwards, that are also about a quarter wave long.
This calculator can be used to design a Quarter Wave Ground Plane antenna, with radials. The radiating element is a quarter wave (λ/4) and the radials are 12% longer. There are usually four radials, three being a minimum, but you could use up to six.
A quarter wave vertical antenna working against a perfectly conducting, infinite ground will have a gain of 5.19 dBi and a radiation resistance of about 36.8 ohms.
The only change that needs to be noted is that the impedance of a monopole antenna is one half of that of a full dipole antenna. For a quarter-wave monopole (L=0.25* ), the impedance is half of that of a half-wave dipole, so Zin = 36.5 + j21.25 Ohms. This can be understood since only half the voltage is required to drive a monopole antenna to ...
So the quarter-wave monopole antenna is the most common type where this antenna is around 1/4 of radio waves wavelength. These antennas are used in internet networks & mobile communications. So this article discusses an overview of a monopole antenna – working with applications.
