Publication: Helical antenna design in the high frequency range
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Date
2009-04-01
Authors
Meor Othman, Ahmad
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Abstract
The main objective of this thesis is to design various structures of the helical antenna in the high frequency range and to study the effect these shapes has on the S11 parameter results of the helical antenna. Among the helical antenna parameters that are being researched are its different forms that link to multiple diameters, radius ratio, and number of turns. Simulation results were simulated using the CST Microwave Studio which is an analytic tool that provides an accurate 3D EM simulation results for high frequency. The helical antenna was constructed for the selected simulation design. This is to compare between the simulated results and the measured results. The simulation results conclude that all of the simulated designs were operating in the High Frequency range and has the return loss below the -10dB reference line. From the far-field simulated results, the helical antennas radiation pattern has a donut shape indicating it as a vertically polarized antenna. The main lobe of the patterns occupied the entire region 0° ≤ θ ≤ 90°. The simulation results also conclude that as the number of turns of the helical antenna is increased the operating frequency would decrease and the bandwidth would be narrower. The directivity of the antenna however is proportional to the number of turns increased. There were some slight difference between the fabricated results and the simulated results due to many factors which will be discussed more in this thesis. Overall, the results of the experiment revealed that all of the helical antennas’ designed was operating in the High Frequency range and have wide bandwidth.