Time Domain Synthesis of Pulsed Arrays

Ciattaglia, M.; Marrocco, Gaetano

doi:10.1109/tap.2008.924714

Cited by 23 publications

(16 citation statements)

References 31 publications

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“…Of particular interest is the application of UWB/SP signals as excitations to an antenna array and the effect of these signals on the array's performance (and synthesis). The fundamental theory governing single TD radiating elements has previously been addressed (see, e.g., [1,[5][6][7]), as has the case of an array fed by pulsed [1,[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Kinematic Properties of Short-Pulsed Sparse Transmitting Arrays

Shlivinski¹

2011

PIER

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Abstract-The kinematic properties of an array of transmitting antennas that are transiently excited by a sequence of modulated pulses, with high repetition rate, are explored.The array's parameterization is carried out via the energy radiation pattern. It is shown that the energy radiation pattern can be decomposed into a set of different types of beam contributions, defined over a beamskeleton, which is determined by the array's physical and excitation parameters. The different types of beams are main beams, gratinglobe beams and cross-pulsed lobe beams, each corresponding to a different pulsed interference mechanism. While grating lobes are timeharmonic phenomena, cross-pulsed lobes are unique for excitation with a pulsed sequence. The different beam types set limits for array sparsity in terms of the array's physical and excitation parameters. The array's directivity is introduced as a figure of merit of its performance and to demonstrate the resulting effect of the time-domain excitation characteristics. The array's parameterization can be used with any type of excitation -from extreme narrow band (time-harmonic) to extreme ultra-wideband (transient/short pulsed) excitation. For timeharmonic excitation, the resulting characterization matches that of the classical frequency domain antenna theory.

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Section: Introductionmentioning

confidence: 99%

Kinematic Properties of Short-Pulsed Sparse Transmitting Arrays

Shlivinski¹

2011

PIER

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“…For a linear array of antennas with N elements, placed at z n = nd (n = 1toN ), with each element having an inward current i n (t), the time domain array factor may be written as Ciattaglia and Marrocco (2008) …”

Section: Numerical Demonstrationsmentioning

confidence: 99%

“…To fulfill this issue, in this work, we will adopt the canonical representation of the transmitting effective height in (Ciattaglia and Marrocco 2008), i.e. :…”

Section: Numerical Demonstrationsmentioning

confidence: 99%

Effects of group delay ripple on optical beam-formers for pulsed antenna arrays

Shabani

Akbari

2011

Opt Quant Electron

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A semi-analytical formulation is presented to quantify the effects of group delay ripple on the performance of an optical beam-former. For delay elements, implemented with commercially available multi-channel fiber Bragg gratings, an impulse response is introduced and calculated for the group delay ripple. To do this, the transfer function of the fiber Bragg grating is parted into two dispersive and non-dispersive sections. This will also ease the demonstration of the fiber Bragg grating as a true time delay element. The formulation is applied to an ultra-wideband pulsed array of antennas. As an example the array factor and electric field patterns of a four element antenna array is derived, using certain available measured data. The distortion in the temporal-angular radiation patterns due to the non-ideal true time delay behavior may be predicted using the presented work. It also facilitates to distinguish between the effects of long and short ripples. This new mathematical investigation is applicable to any linearly chirped fiber Bragg grating other than multi-channel ones. It also includes corrections to previously published formulations.

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“…The simulated annealing algorithm was used to optimise the antenna positions of a linear timed array for ultrasound imaging systems in [16]. The inverse radon transform was applied to the short pulses synthesis of a uniform-spaced linear timed array in [17,18]. In [19,20], it was recently introduced the optimisation of antenna positions and true-time delays of square, random and concentric ring geometries for wide angle scannable energy patterns with low side lobes.…”

Section: Introductionmentioning

confidence: 99%

Timed arrays of spiral antennas for circularly polarised UWB scanned patterns with low side lobes

Reyna

Panduro

Méndez

et al. 2016

IET Microwaves, Antennas & Propagation

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This research presents a novel design of a timed antenna array of two-arm log spiral antennas. The design consists in optimising the non-uniform antenna positions in order to obtain a scanned energy pattern with low side lobes in time domain. It is utilised the well-known sequential quadratic programming for the optimisation. The nonuniform array is compared with conventional geometries, such as square array and concentric ring array. The resulted timed antenna array is also analysed in frequency domain after the optimisation in time domain. The results revealed good performance of the non-uniform timed antenna array for ultra wide band, circular polarisation, beam scanning and low side lobes.

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Time Domain Synthesis of Pulsed Arrays

Cited by 23 publications

References 31 publications

Kinematic Properties of Short-Pulsed Sparse Transmitting Arrays

Kinematic Properties of Short-Pulsed Sparse Transmitting Arrays

Effects of group delay ripple on optical beam-formers for pulsed antenna arrays

Timed arrays of spiral antennas for circularly polarised UWB scanned patterns with low side lobes

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