A Systematic Study of Low SLL Two-way Pattern in Shared Aperture Radar Arrays

Samaras, Theodoros; Sahalos, John N.

doi:10.2528/pierc22102003

Cited by 2 publications

(11 citation statements)

References 8 publications

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“…The relation between transceiver array elements, and the number of elements being fed with higher weight w 2 was derived based on null and SLL locations or heights of the transmit or receive or two-way radiation patterns [16], [19]- [21]. As a result, the selection of a specific null and SLL to achieve optimum relation between transceiver array elements and number of elements excited with w 2 is challenging and it may result in non-optimal solutions.…”

Section: Optimal R T R R W 1 and Wmentioning

confidence: 99%

“…As a result, the selection of a specific null and SLL to achieve optimum relation between transceiver array elements and number of elements excited with w 2 is challenging and it may result in non-optimal solutions. The amplitude coefficients w 1 and w 2 in [19] are assumed to be 1 and 2, respectively, whereas in [20], [21], one of the coefficients is fixed, and the other is determined by applying certain conditions on the array pattern. Thus, the amplitude weights w 1 and w 2 in [19]- [21] may not be optimal for the design of radar arrays.…”

Section: Optimal R T R R W 1 and Wmentioning

confidence: 99%

“…The amplitude coefficients w 1 and w 2 in [19] are assumed to be 1 and 2, respectively, whereas in [20], [21], one of the coefficients is fixed, and the other is determined by applying certain conditions on the array pattern. Thus, the amplitude weights w 1 and w 2 in [19]- [21] may not be optimal for the design of radar arrays. In principle, the amplitude weights w 1 and w 2 are complex numbers characterized by magnitude and phase in the interval of (0, ∞) and [0, 360 • ], respectively.…”

Section: Optimal R T R R W 1 and Wmentioning

confidence: 99%

“…The selected design parameters of the two-way array factor are R t =0.47, R r =0.68, S=1, d=𝜆/2, w 1 =1 and w 2 =2.17. Now by using ( 1)-( 2) and ( 13)-( 14), the final design equations of the linear and planar two-way array pattern are provided in (21) and (22), respectively.…”

Section: A Performance Analysismentioning

confidence: 99%

“…Such designs relied on different test sets (based on the sidelobe and null locations) to find the relation between transmit and receive array size or the number of elements excited with higher weights, hence producing non-optimal solutions. Realizing such a transceiver requires a feeding architecture with several circulator blocks equal to that of the transmit/receive array elements, hence being a cumbersome and costly solution [11], [20], [21]. This work mitigates the limitations of the state-of-the-art in transceiver array design to provide an optimal solution in the SLL in linear and planar arrays, while maintaining a high directivity and taper efficiency.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Rajender,

Choudhury,

Subhashini

et al. 2024

IEEE Trans. Antennas Propagat.

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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.

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Section: Optimal R T R R W 1 and Wmentioning

confidence: 99%