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The low-profile hemispherical helical antenna with circular polarization radiation over a wide angular range

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3 Author(s)
Hui, H.T. ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore ; Chan, K.Y. ; Yung, E.K.N.

The low-profile hemispherical helical antenna is studied experimentally and theoretically. This antenna can produce circular polarization radiation over a wide angular range of 90°. The current distribution, the input impedance, the axial ratio, the power gain, and the radiation pattern are rigorously studied. The 3-dB axial ratio bandwidth of a five-turn hemispherical helical antenna is found to be 14.6. In the range of 1.0≤C/λ≤1.3, a relatively stable power gain of more than 9 dB is obtained. The radiation patterns typically consist of a large smooth main lobe with almost no sidelobes. These new antenna characteristics have a potential application in mobile satellite communications.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:51 ,  Issue: 6 )