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Search procedure for efficient superdirective array and image enhancement functions

Search procedure for efficient superdirective array and image enhancement functions

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A technique is presented for generation of efficient superdirective array functions, using a composite polynomial based on the Cheby̅shev polynomials. The generated radiation pattern has a narrow main beam with high radiation efficiency, indicative of an array function which is tolerant to elemental amplitude and phase errors.

Inspec keywords: antenna arrays; directive antennas; antenna radiation patterns

Other keywords: superdirective array functions; image enhancement functions; composite polynomial; Chebyshev polynomials

Subjects: Antenna theory; Antenna arrays

References

    1. 1)
      • D.K. Cheng . Optimisation techniques for antenna arrays. Proc. IEEE , 1664 - 1674
    2. 2)
      • Dawoud, M.M., Anderson, A.P.: `Superdirectivity with appreciable bandwidth in arrays of radiating elements fed by microwave transistors', Proceedings of 4th European Microwave Conference, September 1974, p. 278–282.
    3. 3)
      • A. Bloch , R.G. Medhurst , S.D. Pool . A new approach to the design of superdirective aerial arrays. J.IEE , 303 - 314
    4. 4)
      • C.L. Dolph . A current distribution for broadside arrays which optimises the relationship between beamwidth and side lobe level. Proc. Inst. Radio Eng. , 335 - 348
    5. 5)
      • C.T Tai . The optimum directivity of uniformly spaced broadside arrays of dipoles. IEEE Trans. , 447 - 454
    6. 6)
      • A.P. Anderson , J.C Bennett . Feasibility of enhanced microwave image resolution using a superdirective aperture. Proc. IEEE , 376 - 378
    7. 7)
      • A.C. Marvin , A.P. Anderson , J.C. Bennett . Inadequacy of the Rayleigh range criterion for superdirective arrays. Electron. Lett. , 415 - 416
    8. 8)
      • S.A. Schelkunoff . A mathematical theory of linear arrays. Bell Syst. Tech. J. , 80 - 107
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