Propagation of Large Bandwidth Microwave Signals in Water

Pieraccini, Massimiliano; Bicci, Alberto; Mecatti, D.; Macaluso, G.; Atzeni, C.

doi:10.1109/tap.2009.2025674

Cited by 30 publications

(23 citation statements)

References 7 publications

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“…(37) combined with Eq. (30) in the four cases considered in this paragraph. The optical thickness α c ℓ = 7 has been chosen in order that the main signal is dominated by the precursor but remains visible.…”

Section: Response To Sine-waves With Linearly Varying Amplitudementioning

confidence: 92%

“…Propagation of waves in Debye media has been extensively studied in the past, with particular attention paid to the important case of water in the radio-frequency and microwave domains. For papers related to the present study, see, e.g., Refs [10,[22][23][24][25][26][27][28][29][30][31][32][33][34]. Albanese et al were the first to refer to the Brillouin precursors in Debye media [22].…”

Section: Introductionmentioning

confidence: 99%

“…Stoudt et al [27] performed the corresponding experiments, achieving direct detection of Brillouin precursors. Indirect experimental demonstrations were achieved later [30,32]. Oughstun et al theoretically studied at length the propagation of waves with a step, rectangular or trapezoidal envelope in Debye media by combining numerical computations and analytical calculations using saddle-point methods [5,29,34].…”

Section: Introductionmentioning

confidence: 99%

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Brillouin precursors in Debye media

Macke

Ségard

2015

Phys. Rev. A

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We theoretically study the formation of Brillouin precursors in Debye media. We point out that the precursors are visible only at propagation distances such that the impulse response of the medium is essentially determined by the frequency dependence of its absorption and is practically Gaussian. By simple convolution, we then obtain explicit analytical expressions of the transmitted waves generated by reference incident waves, distinguishing precursor and main signal by a simple examination of the long-time behavior of the overall signal. These expressions are in good agreement with the signals obtained in numerical or real experiments performed on water in the radio-frequency domain and explain in particular some observed shapes of the precursor. Results are obtained for other remarkable incident waves. In addition, we show quite generally that the shape of the Brillouin precursor appearing alone at sufficiently large propagation distance and the law giving its amplitude as a function of this distance do not depend on the precise form of the incident wave but only on its integral properties. The incidence of a static conductivity of the medium is also examined and explicit analytical results are again given in the limit of weak and strong conductivities.

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Section: Response To Sine-waves With Linearly Varying Amplitudementioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Brillouin precursors in Debye media

Macke

Ségard

2015

Phys. Rev. A

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“…It has been demonstrated that the propagation of any kind of signal through any dispersive media can arise out the formation of signals named as Brillouin precursors [1][2][3][4][5]. This phenomenon depends on the dielectric properties of the underlying medium as well as on other parameters or settings; we can mention the input signal type and its configuration, the involved transmitted and/or received bandwidth, among the main of those parameters which additionally determine the formation of the Brillouin precursor [1,2,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Radio channel characterization of intra-body propagation under frequency dispersive perspective

Alejos

Dawood

Falcone

et al. 2014

The 8th European Conference on Antennas and Propagation (EuCAP 2014)

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In this paper we consider the analysis of the Brillouin precursor formation to understand the impairments undergone by ultra wideband waveforms propagating through naturally dispersive media as human tissues. By means of a frequency-domain method based on considering the frequency response of the medium under study, the effect of these media on the evolution of an input signal can be seen as a frequency filtering. The simulations were performed at a centre frequency of 6.5GHz and for a signal bandwidth of 3GHz. The experienced impairments are assessed in terms of the degradation experienced by the main functions that model the human body radio channel: power delay profile and frequency crosscorrelation function (FCF). For them we analysed the effect of the dispersive propagation in terms of parameters used for information retrieval: peak amplitude decay, CCF secondary sidelobe level and multipath detectability. body radiopropagation. We also review the definition of the parameters adopted to quantify the electromagnetic absorption inside biological tissue under the dispersive perspective.

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“…Of particular importance here is the fact that the peak amplitude point of the Brillouin precursor experiences zero exponential decay with propagation distance z Ͼ 0, decreasing algebraically as z −1/2 in the dispersive absorptive medium, with the peak values of both the energy density and Poynting vector then only decreasing algebraically as z −1 , thereby transmitting electromagnetic energy deeper into the dispersive attenuative dielectric [8,14] than that described by the Beer-Lambert-Bouger law [15]. This rather unique feature renders the Brillouin precursor as a powerful tool for imaging through a given obscuring dispersive material [8,16], a result that has been verified experimentally for large bandwidth microwave signals [17].…”

Section: Introductionmentioning

confidence: 99%

Optical precursors in the singular and weak dispersion limits

et al. 2010

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The description of the precursor fields in a single-resonance Lorentz model dielectric is considered in the singular and weak dispersion limits. The singular dispersion limit is obtained as the damping approaches zero and the material dispersion becomes increasingly concentrated about the resonance frequency. The algebraic peak amplitude decay of the Brillouin precursor with propagation distance z Ͼ 0 then changes from a z −1/2 to a z −1/3 behavior. The weak dispersion limit is obtained as the material density decreases to zero. The material dispersion then becomes vanishingly small everywhere and the precursors become increasingly compressed in the space-time domain immediately following the speed-of-light point ͑z , t͒ = ͑z , z / c͒. In order to circumvent the numerical difficulties introduced in this case, an approximate equivalence relation is derived that allows the propagated field evolution due to an ultrawideband signal to be calculated in an equivalent dispersive medium that is highly absorptive.

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Propagation of Large Bandwidth Microwave Signals in Water

Cited by 30 publications

References 7 publications

Brillouin precursors in Debye media

Brillouin precursors in Debye media

Radio channel characterization of intra-body propagation under frequency dispersive perspective

Optical precursors in the singular and weak dispersion limits

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