Sidelobes in the two-way radiation pattern are of serious concern in a radar array. Several techniques have evolved to mitigate the problem, which include amplitude tapering, Genetic Algorithm (GA) optimization, thinning transceiver aperture, and two-weight amplitude distribution. With such optimization schemes, the sidelobes can be considerably suppressed but at the cost of a reduction in directivity or taper efficiency. Further, such amplitude tapers require a complex feeding network design. This work alleviates such design restrictions and proposes a systematic approach to lower the sidelobes in radar two-way shared aperture arrays. The proposed methodology can achieve a sidelobe level (SLL) of below -52 dB in both linear and planar arrays, which is about 18 dB enhancement in SLL compared with uniform transmit and thinned receive arrays. In addition, as a result of the equal transceiver array size in the proposed design, an improvement of approximately 0.44 dB and 0.68 dB in directivity is achieved in linear and planar arrays, respectively. A novel feeding architecture is also illustrated to reduce the cost and complexity of the overall feeding network. A set of full-wave simulations have also been performed to validate the theoretical results.

Design of Linear and Planar Arrays with Low Sidelobe Levels and High Directivity Using Two-way Array Factor

Rathod R.
Primo
;
Choudhury S.;Ciarpi G.;Genovesi S.;Rossi D.
Ultimo
2024-01-01

Abstract

Sidelobes in the two-way radiation pattern are of serious concern in a radar array. Several techniques have evolved to mitigate the problem, which include amplitude tapering, Genetic Algorithm (GA) optimization, thinning transceiver aperture, and two-weight amplitude distribution. With such optimization schemes, the sidelobes can be considerably suppressed but at the cost of a reduction in directivity or taper efficiency. Further, such amplitude tapers require a complex feeding network design. This work alleviates such design restrictions and proposes a systematic approach to lower the sidelobes in radar two-way shared aperture arrays. The proposed methodology can achieve a sidelobe level (SLL) of below -52 dB in both linear and planar arrays, which is about 18 dB enhancement in SLL compared with uniform transmit and thinned receive arrays. In addition, as a result of the equal transceiver array size in the proposed design, an improvement of approximately 0.44 dB and 0.68 dB in directivity is achieved in linear and planar arrays, respectively. A novel feeding architecture is also illustrated to reduce the cost and complexity of the overall feeding network. A set of full-wave simulations have also been performed to validate the theoretical results.
2024
Rathod, R.; Choudhury, S.; Subhashini, K.; Ciarpi, G.; Genovesi, S.; Rossi, D.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1232554
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