On the Role and Choice of Source Polarization in Time-Reversal Focusing of Vector Fields

Iero, Domenica A. M.; Crocco, Lorenzo; Isernia, Tommaso

doi:10.1109/lawp.2015.2438539

Cited by 8 publications

(5 citation statements)

References 15 publications

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“…Furthermore, field polarization has also been shown to have a significant impact on microwave breakdown dynamics and pattern [60]. Although it was not discussed in this paper, TR allows the control of the focusing field polarization [61,62]. Thus, this Space-Time Plasma Steering Source could lead to the development of methods allowing the space-time sculpture of microwave breakdown, with the microwave energy that would "accompany" the breakdown dynamics and pattern.…”

Section: Discussionmentioning

confidence: 99%

Space-Time Plasma-Steering Source: Control of Microwave Plasmas in Overmoded Cavities

et al. 2021

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Recently, Space-Time Plasma Steering Source has been proposed as an innovative microwave plasma source to meet the challenge of controlling plasmas in overmoded cavities. This concept has been successfully demonstrated experimentally, allowing the space time control of nanosecond microwave plasmas on initiators. This paper gives insights into the path that shall be taken to reach full space-time control of plasmas in overmoded cavities. To that end, a key criterion, namely the "Plasma Steering criterion", is introduced and verified with a numerical model. This criterion must be respected for an accurate space-time control of plasmas in overmoded cavities. The importance of the plasma density (depending on its value with respect to the critical plasma density) on the plasma control capabilities is also highlighted.

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Section: Discussionmentioning

confidence: 99%

Space-Time Plasma-Steering Source: Control of Microwave Plasmas in Overmoded Cavities

et al. 2021

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“…To this end, we can generalize the procedure proposed in Iero et al . [] to 3‐D scenarios involving vector waves, by formulating the optimization of the test source polarization as…”

Section: Electromagnetic Time Reversal and Optimization Of Test Sourcmentioning

confidence: 99%

“…To this end, we can generalize the procedure proposed in Iero et al [2016] to 3-D scenarios involving vector waves, by formulating the optimization of the test source polarization as For a given target point r T and for E given by equation (8), select the polarization J…”

Section: Optimizing Tr By Selecting the Test Source Polarizationmentioning

confidence: 99%

“…To address the above mentioned issues, with reference to 2-D vector problems, we recently developed a pair of alternative focusing strategies (the optimized time reversal (OTR) [Iero et al, 2016] and a new version of OCPF [Iero et al, 2015]) to deal with such challenges. These focusing approaches are herein generalized and tested to tackle the general and more challenging 3-D electromagnetic focusing problem.…”

Section: Introductionmentioning

confidence: 99%

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Advances in 3‐D electromagnetic focusing: Optimized time reversal and optimal constrained power focusing

2017

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In this paper, we show how to successfully deal with the problem of focusing a vector field in a 3‐D scenario, by properly extending two recently introduced procedures developed with respect to 2‐D fields. In particular, to address this problem relevant in many applications, we describe an improved version of the well‐known time reversal technique, the optimized time reversal, and a procedure able to provide an optimal focusing in the presence of arbitrary upper bounds for the field intensity, the optimal constrained power focusing. The two approaches are presented, discussed, and comparatively assessed in two different scenarios representative of realistic working conditions. The results confirm the possibility of tackling the problem of focusing a 3‐D vector field in an efficient way and that the optimal constrained power focusing, while computationally heavier, provides the best possible focusing performance.

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“…It has been shown the time reversal can exhibit some unique characteristics involving the temporal and spatial focusing and super-resolution focusing [1][2][3][4], thus having many potential applications in detection, imaging, monitoring and wireless communications [5][6][7][8][9]. The key issue of a time reversal based system is how to effectively reverse a required signal in the time domain.…”

Section: Introductionmentioning

confidence: 99%

Wideband Time Reversal of Microwave Signals Based on Phase Conjugating

Sun¹,

Li²

2018

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A phase conjugating network to realize wideband time reversal of microwave signals is studied in this paper. After discussions on the operation principle of the reversed signal in the time and frequency domains, a prototype network based on phase-conjugating mixing is developed. A demonstrator is designed and fabricated, and two examinations are carried out to confirm the presented method. For a fixed LO signal, a chirp RF signal with 40-MHz bandwidth can be phase-conjugated mixing, thus time reversed effectively. To widen the operation bandwidth, a method named dynamically synchronous phase conjugating is proposed; this enables a microwave signal to be dynamically reversed by synchronously varying the LO frequency along with the RF frequency, thus achieving the phase-conjugating dynamically in a wide frequency band. The simulation and experiment results of a wideband microwave signal, ranging from 5.4 to 6.25 GHz under a measured conversion loss of  10 dB, verify our studies.

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On the Role and Choice of Source Polarization in Time-Reversal Focusing of Vector Fields

Cited by 8 publications

References 15 publications

Space-Time Plasma-Steering Source: Control of Microwave Plasmas in Overmoded Cavities

Space-Time Plasma-Steering Source: Control of Microwave Plasmas in Overmoded Cavities

Advances in 3‐D electromagnetic focusing: Optimized time reversal and optimal constrained power focusing

Wideband Time Reversal of Microwave Signals Based on Phase Conjugating

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