Linear Array Pattern Synthesis for Wide Band Sector Nulling

Ismail, T. H.; Mismar, M. J.; Dawoud, M.M.

doi:10.2528/pier98040900

Cited by 6 publications

(9 citation statements)

References 7 publications

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“…In particular, works on array synthesis methods, based on deterministic procedures [1,2] or on heuristic search methods [3,4], are addressed. Usually, these techniques are focused on the array factor synthesis, assuming ideal isotropic radiators separated a distance close to half of a wavelength.…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of Linear Aperiodic Array for Grating Lobe Suppression

Suárez¹,

León²,

Arrebola³

et al. 2012

PIER C

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Abstract-In this paper, a deterministic strategy to generate the aperiodicity, based on three geometric taper distributions is studied and validated.The method is applied to study arrays with average inter-elements spacing larger than a wavelength, exhibiting a reduction of the grating lobe level and requiring lower aperture size against a periodic structure with same directivity. Finally, a microstrip patch aperiodic array has been designed, manufactured and measured for an experimental validation of the concept, obtaining good agreement between simulated and measured radiation patterns. This manufactured antenna demonstrates experimentally the reduction of the grating lobes with a similar level to the side lobe.

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Section: Introductionmentioning

confidence: 99%

Experimental Validation of Linear Aperiodic Array for Grating Lobe Suppression

Suárez¹,

León²,

Arrebola³

et al. 2012

PIER C

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“…Various research papers [2][3][4][5][6][7][8][9][10][11][12][13] and [17][18][19][20][21][22][23][24][25][26][27] are dedicated for single beam and multiple beamforming methods. Among them one of the most popular method is Butler matrix [2] beam former (after J. L. Butler, 1961), which reduces the number of elements in the beam forming network and generates multiple orthogonal beams.…”

Section: Introductionmentioning

confidence: 99%

A Schematic for Broadband Beam Formation Using Time-Delay Technique

Alfred¹,

Bishayee²,

Chakravarty³

et al. 2008

PIER M

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Abstract-Simultaneous multiple beam generation by phased array antennas have great importance in recent time, e.g., multiple access satellite communication systems, MIMO (multiple input and multiple output), target tracking radars etc. Here in this article a novel yet simple wideband multiple beam formation network (BFN) has been proposed. Unlike the conventional phase shifter based system, this scheme is based on true time-delay units which is potential for wideband application.

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“…The corresponding angles are À45, À28, 14, and 358, respectively. Table II gives the computed element complex current for the Figures 6,7,8,and 9. In Figures 8 and 9, we have shown the numerical results calculated by SQP algorithm in comparison with other methods, such as the minimax approximation [9] and MTSA [11]. For comparison, an initial 30-dB Chebyshev is assumed for 20 equispaced linear elements with k/2 interelement spacing is considered.…”

Section: Complex Weight Control Of Array Pattern Nullingmentioning

confidence: 99%

“…1 in Ref. 9) and our SQP simulation. In Figure 9, it can be seen that the simulation result agree well on the null positions (centers at À0.35, 0.35, and 0.75), relative bandwidths (5, 5, and 10%, respectively), and null depth, However, the maximum SLL of the perturbed pattern is not maintained at 30 dB (the corresponding SLL is À28.5 dB).…”

Section: Complex Weight Control Of Array Pattern Nullingmentioning

confidence: 99%

“…The phase-only control is of particular interest in null steering, it is responsible for the main beam scanning. The synthesis methods based on the amplitude-only or the position-only control are incapable to realize asymmetric nulls about the main beam [9,11], the complex coefficient method can impose any asymmetric nulls at arbitrary directions in the side lobe region. This method is effective for the applications in adaptive array with strongly controllable side lobe level (SLL).…”

Section: Introductionmentioning

confidence: 99%

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Complex weight control of array pattern nulling

Mouhamadou

Vaudon

2007

Int J RF and Microwave Comp Aid Eng

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An efficient method based on the sequential quadratic programming (SQP) algorithm for the linear antenna arrays pattern synthesis with prescribed nulls in the interference direction and minimum side lobe levels by the complex weights of each array element is presented. In general, the pattern synthesis technique that generates a desired pattern is a greatly nonlinear optimization problem. SQP method is a versatile method to solve the general nonlinear constrained optimization problems and is much simpler to implement. It transforms the nonlinear minimization problem to a sequence of quadratic subproblem that is easier to solve, based on a quadratic approximation of the Lagrangian function. Several numerical results of Chebyshev pattern with the imposed single, multiple, and broad nulls sectors are provided and compared with published results to illustrate the performance of the proposed method.

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Linear Array Pattern Synthesis for Wide Band Sector Nulling

Cited by 6 publications

References 7 publications

Experimental Validation of Linear Aperiodic Array for Grating Lobe Suppression

Experimental Validation of Linear Aperiodic Array for Grating Lobe Suppression

A Schematic for Broadband Beam Formation Using Time-Delay Technique

Complex weight control of array pattern nulling

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