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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.
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.
One of the most useful antennas in the repertoire is the Marconi or quarter wave grounded vertical antenna. Its invention made it possible to halve the length of antennas, simplifying communications, especially at HF and below.
An example of the radiation pattern for a quarter-wavelength monopole antenna (oriented in the +z-direction) on a ground plane with a diameter of 3 wavelengths is shown in the following Figure: Note that the resulting radiation pattern for this monopole antenna is still omnidirectional.
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.
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.
