In this lecture, we'll show some pictures with explanations about monopole antenna.
A monopole antenna is a radio antenna that is one half of a dipole antenna combined with a right-angle ground plane of considerable length in place of its other half.
A dipole antenna has two halves, while a monopole antenna replaces one of the halves with an electrically conductive surface known as a ground plane, which behaves like the other half of a dipole antenna.
With a large enough ground plane, the monopole antenna can be as strong as a dipole antenna. Automobile antennas are a common example of a monopole antenna, with the metal of the automobile itself forming the ground plane.
A dipole antenna has two halves, while a monopole antenna replaces one of the halves with an electrically conductive surface known as a ground plane, which behaves like the other half of a dipole antenna.
With a large enough ground plane, the monopole antenna can be as strong as a dipole antenna. Automobile antennas are a common example of a monopole antenna, with the metal of the automobile itself forming the ground plane.
A cross-sectional view of the antenna, clearly showing the upper frequency notches (side) and lower fequency notch (centre).
A coax of 75 Ohms is used to feed the antenna. The behaviour of the antenna can be easily investigated using CST MWS. Three configurations were simulated; With all notches present, with only the centre notch and with only the side notches.
A coax of 75 Ohms is used to feed the antenna. The behaviour of the antenna can be easily investigated using CST MWS. Three configurations were simulated; With all notches present, with only the centre notch and with only the side notches.
The S-parameters for the 3 aforementioned cases are shown in this Figure .
As expected, the side notches contribute a high frequency mode with a low frequency mode results from the central notch.
The combined effect is shown in complete all-notches configuration.
As expected, the side notches contribute a high frequency mode with a low frequency mode results from the central notch.
The combined effect is shown in complete all-notches configuration.
The 3D Farfield plots at 4GHz and 4.78 GHz are shown in this Figure with the polar forms in Figure 5.
These results correspond to those presented in [1] where simulated results were compared to measurements for a wide-range of antenna configurations.
These results correspond to those presented in [1] where simulated results were compared to measurements for a wide-range of antenna configurations.
This article summarises only a fraction of the work carried out in the [1] but does demonstrate the ability of CST MWS to simulate such structures.
CST MWS lends itself naturally to the simulation of UWB antennas since it enables the user to investigate their real Time Domain behaviour.
Other possibilities include CST DESIGN STUDIO™ (CST DS) which allows a co-simulation to be carried out of the UWB system.
For a comparison between the measurement and simulated results, the reader is advised to consult [1] where the excellent agreement is shown.
Reference: http://www.wisegeek.com/what-is-a-monopole-antenna.htm
https://www.cst.com/Content/Applications/Article/Multiple+Band-Notched+Planar+Monopole+UWB+Antenna
CST MWS lends itself naturally to the simulation of UWB antennas since it enables the user to investigate their real Time Domain behaviour.
Other possibilities include CST DESIGN STUDIO™ (CST DS) which allows a co-simulation to be carried out of the UWB system.
For a comparison between the measurement and simulated results, the reader is advised to consult [1] where the excellent agreement is shown.
Reference: http://www.wisegeek.com/what-is-a-monopole-antenna.htm
https://www.cst.com/Content/Applications/Article/Multiple+Band-Notched+Planar+Monopole+UWB+Antenna
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