Optimal Synthesis of Array Pattern for Concentric Circular Antenna Array Using Hybrid Evolutionary Programming by uranus

Author:uranus
Language: eng
Format: epub
Tags: Concentric Circular Antenna Array, Non- uniform Excitation, Sidelobe Level, Hybrid Evolutionary Programming

-Uniform Excitation (without central element feeding) " Uniform Excitation (with central element feeding) - HEP (without central element feeding) -HEP (with central element feeding)

-150

-100

-50 0 50

Angle of Arival (Degrees)

100

150

Fig. 2. Radiation pattern for a uniformly excited CCAA and corresponding HEP based non-uniformly excited CCAA (N,=4, N 2 =6, N 3 =8).

- Uniform Excitation (without central element feeding)

- Uniform Excitation (with central element feeding)

- HEP (without central element feeding)

- HEP (with central element feeding)

-150

■100 -50 0 50

Angle of arival (degrees)

100

150

Fig. 3. Radiation pattern for a uniformly excited CCAA and corresponding HEP based non-uniformly excited CCAA (N,=8, N 2 =10, N 3 =12).

100

150 200 250

Iteration Cycle

300 350

400

Fig. 4. Convergence profile for HEP in case of non-uniformly excited CCAA (N,=4, N 2 =6, N 3 =8 with central element feeding)

Table I SLL And BWFN FOR Uniformly Excited (/ . =1) CCAA Sets

Table II

Current Excitation Weights, SLL and BWFN For Non-Uniformly Excited

CCAA Design Sets (Case (a)) Using HEP

20

©2010 ACEEE DOI:01.UEPE.01.03.79

vcACEEE

ACEEE Int. J. on Electrical and Power Engineering, Vol. 01, No. 03, Dec 2010

Table III

Current Excitation Weights, SLL and BWFN For Non-Uniformly Excited

CCAA Design Sets (Case (b)) Using HEP

VI. Conclusion

In this paper, the optimal design of a non-uniformly excited CCAAs with uniform inter-element spacing and with / without central element feeding has been described using the hybrid evolutionary optimization technique, HEP. Experimental results reveal that the design of non-uniformly excited CCAA offer a considerable SLL reduction along with the reduction of BWFN as well as compared to the case of corresponding uniformly excited CCAA. The main contribution of the paper is twofold: (i) All CCAA designs having central element feeding yield

much more reductions in SLL as compared to the same not having central element feeding, (ii) The CCAA design having Ni=4, N2=6, N 3 =8 elements along with central element feeding gives the grand maximum SLL reduction (-40.22 dB) as compared to all other designs, which one is thus the grand optimal design among all the three-ring designs. Thus, the proposed HEP technique proves to be a promising evolutionary optimization technique for the global optimization of antenna array problem.

References

[1] C. Stearns and A. Stewart, An investigation of concentric ring antennas with low sidelobes, IEEE Trans. Antennas Propag. 13(6) (Nov 1965), 856-863.

[2] R. Das, Concentric ring array, IEEE Trans. Antennas Propag. 14(3) (May 1966), 398^100.

[3] N. Goto and D. K. Cheng, On the synthesis of concentric-ring arrays, IEEE Proc. 58(5) (May 1970), 839-840.

[4] L. Biller and G. Friedman, Optimization of radiation patterns for an array of concentric ring sources, IEEE Trans. Audio Electroacoust. 21(1) (Feb. 1973), 57-61.

[5] M D. A. Huebner, Design and optimization of small concentric ring arrays, in Proc. IEEE APS Symp. (1978), 455^158.

[6] C. A. Balanis, Antenna Theory Analysis and Design, John Wiley & Sons, New York, 1997.

[7] R.L.Haupt, "Optimized element spacing for low sidelobe concentric ring arrays," IEEE Trans. Antennas Propag., vol. 56(1), pp. 266-268, Jan. 2008.

[8] M. Dessouky, H. Sharshar, and Y. Albagory, "Efficient sidelobe reduction technique for small-sized concentric circular arrays," Progress In Electromagnetics Research, vol. PIER 65, pp. 187-200, 2006.

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