Optimisation of circular polarisation performance for 4-arm planar spiral antenna with non perfect excitation networks

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Optimisation of circular polarisation performance for 4-arm planar spiral antenna with non perfect excitation networks

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© The Institution of Electrical Engineers
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The crosspolarisation of antenna systems involving 4-arm-structures depends on two factors: the quality of the feeding network and the shape of the antenna arms. Using a mathematical description for the separate treatment of these factors, planar archimedean and logarithmic spirals are investigated to optimise the arm shape. It is shown that a proper choice of the antenna shape can improve the crosspolarisation discrimination of the antenna system by more than 15 dB. It is also demonstrated that an optimised antenna shape yields significantly improved polarisation performance for the entire main beam region, even in the case of a poor excitation network.

Inspec keywords: antenna radiation patterns; antennas; electromagnetic wave polarisation

Other keywords: crosspolarisation discrimination; logarithmic spirals; optimisation; radiation patterns; 4-arm planar spiral antenna; feeding network; archimedean spirals; circular polarisation performance; nonperfect excitation networks

Subjects: Single antennas

References

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      • O.K. Kim , J.D. Dyson . A log-spiral antenna with selectable polarization. IEEE Trans. , 675 - 677
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      • J. Yamauchi , H. Nakano , S. Hashimoto . Polarization diversity of 4-arm planar spiral antenna. IEEE Int. Symp. APS , 130 - 133
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      • U. Kraft . Antenna structures for perfect circular polarization in main-beam direction. Archiv für Elektronik und Übertragungstechnik , 242 - 247
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