Numerical analysis of 4-arm Archimedean spiral antenna

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Numerical analysis of 4-arm Archimedean spiral antenna

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© The Institution of Electrical Engineers
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The radiation fields of a 4-arm Archimedean spiral antenna excited with three types of balanced mode, M1(1, j, −1, −j), M2(1, −1, 1, −1) and M3(1, −j, −1, j), are evaluated on the basis of the current distributions which are determined numerically. An axial beam and conical beams are presented with experimental results. It is demonstrated that an axial ratio of less than 3 dB can be obtained over a wide angle range of about ± 60°, when the spiral is excited with modes 1 and 2. It is also found that the axial ratio for mode 3 is liable to be deteriorated by the reflected current, particularly around the spiral axis.

Inspec keywords: antenna arrays; numerical analysis; antenna radiation patterns

Other keywords: 4-arm Archimedean spiral antenna; radiation fields; current distributions; axial beam; numerical analysis; conical beams

Subjects: Antenna arrays; Numerical analysis; Antenna theory

References

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      • S.R. Laxpati , R. Mittra . Boundary-value problems associated with source-excited planar-equiangular-spiral antennas. Proc. IEE , 352 - 359
    2. 2)
      • A.E. Atia , K.K. Mei . Analysis of multiple-arm conical logspiral antennas. IEEE Trans. , 320 - 331
    3. 3)
      • J.A. Kaiser . The Archimedean two-wire spiral antenna. IRE Trans. , 312 - 323
    4. 4)
      • Nakano, H., Yamauchi, J.: `A theoretical investigation of the two-wire round spiral antenna', Proc. IEEE International Conference on antenna and propagation, 1979, Seattle, p. 387–390.
    5. 5)
      • H. Nakano , J. Yamauchi . Characteristics of modified spiral and helical antennas. IEE Proc. H, Microwaves, Opt. & Antennas , 232 - 237
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