Constrained focusing of vector fields intensity in near zone and/or complex scenarios as a low-dimensional global optimization

Battaglia, G. M.; Morabito, Andrea Francesco; Palmeri, Roberta; Isernia, Tommaso

doi:10.1080/09205071.2020.1801521

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…The first one is concerned with scalar fields, such as the acoustic waves, wherein the problem still holds scalar and the rationale underlying VE and the above analytical developments can be extended and tailored. On the hand other hand, for vector fields, the VE design entails the finding of the optimal polarization as additional degree of freedom [31]. Then, one could split the problem as three scalar separate focusing problems by considering three different independent polarizations and recasting the problem accordingly.…”

Section: Discussionmentioning

confidence: 99%

Virtual Experiments via LSM for Quantitative 2-D Inverse Scattering: Challenges and Opportunities

Bevacqua,

Donato

2024

IEEE Trans. Antennas Propagat.

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In this paper, we investigate the Virtual Experiments (VE) setting by means of analytical solution of the far-field equation (FFE), that is the equation underlying the linear sampling method (LSM). In particular, an analytical expression for the VE internal field is derived in case of penetrable circular cylinders, which provides a straightforward and more comprehensive overview of the VE settings with particular hints on its reliability and validity range when applied for quantitative imaging. Numerical examples are reported to show the analytic findings, also in case of non circular targets. The reported analysis can open the way to new possibilities in VE design for electromagnetic inverse scattering, microwave imaging and related focusing problems.

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Section: Discussionmentioning

confidence: 99%

Virtual Experiments via LSM for Quantitative 2-D Inverse Scattering: Challenges and Opportunities

Bevacqua,

Donato

2024

IEEE Trans. Antennas Propagat.

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“…A second aspect of TR focusing is the choice of the polarization axis for the virtual source. The polarization problem in vector field focusing has been addressed in several ways in the literature, also recently (Iero et al 2016, Battaglia et al 2020. In the case of a cylindrical applicator, the antennas can be aligned to the symmetry axis (figure 2(a)): the virtual source should then also be aligned with this principal axis.…”

Section: Challenges For Tr Focusing In Mw-htmentioning

confidence: 99%

Iterative time-reversal for multi-frequency hyperthermia

Zanoli

Trefná

2021

Phys. Med. Biol.

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Time-reversal (TR) is a known wideband array beam-forming technique that has been suggested as a treatment planning alternative in deep microwave hyperthermia for cancer treatment. While the aim in classic TR is to focus the energy at a specific point within the target, no assumptions are made on secondary lobes that might arise in the healthy tissues. These secondary lobes, together with tissue heterogeneity, may result in hot-spots (HSs), which are known to limit the efficiency of the thermal dose delivery to the tumor. This paper proposes a novel wideband TR focusing method that iteratively shifts the focus away from HSs and towards cold-spots from an initial TR solution, a procedure that improves tumor coverage and reduces HSs. We verify this method on two different applicator topologies and several target volume configurations. The algorithm is deterministic and runs within seconds, enabling its use for real-time applications. At the same time, it yields results comparable to those obtained with global stochastic optimizers such as Particle Swarm.

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“…In particular, the optimal compromise among sum and difference patterns is systematically pursued by fixing once and for all the working frequency to a single prescribed value [1][2][3][4][5][6][7][8]. This is also the case where the synthesis of a single pencil [9][10][11][12] or shaped [13][14][15] beam is addressed.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Wideband Reconfigurable Array Antennas for Monopulse Radar Applications

Bui¹,

Anselmi²,

Battaglia³

et al. 2021

PIER M

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A new approach to the bandwidth maximization of reconfigurable antenna arrays for monopulse radar applications is proposed and tested. The provided radiating systems allow switching the radiation behavior from sum to difference patterns (and vice versa) while sharing the excitation amplitudes of a user-decided set of radiating elements. Furthermore, the proposed design procedure guarantees the maximum possible bandwidth performance once the overall antenna size, the desired beamwidth, sidelobe level, and slope in the target direction of the generated power patterns are fixed. The synthesis problem is cast and solved as a sequence of convex programming optimizations, and hence the maximization of performances is attained with advantages in terms of computational times as well as convergence to the global optimum. The given theory is supported by numerical experiments including arrays with ultra-wideband performances.

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Constrained focusing of vector fields intensity in near zone and/or complex scenarios as a low-dimensional global optimization

Cited by 8 publications

References 29 publications

Virtual Experiments via LSM for Quantitative 2-D Inverse Scattering: Challenges and Opportunities

Virtual Experiments via LSM for Quantitative 2-D Inverse Scattering: Challenges and Opportunities

Iterative time-reversal for multi-frequency hyperthermia

Synthesis of Wideband Reconfigurable Array Antennas for Monopulse Radar Applications

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