DOI: https://doi.org/10.3103/S0735272715060059
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Spectrum maximum of pulse with Gaussian envelope that was changed after passing through a layer of biological tissue

Estimation of parameter variation of wideband signals and their fields in media with attenuation

Iuliia V. Baksheeva

Abstract


Wideband signals and their fields in media with frequency-dependent attenuation have been considered using an example of the analysis of propagation of ultrasonic signals in biological media. An analytical expression for the spatial frequency response of the layer of biological tissue with frequency-dependent attenuation for diagnostically meaningful frequency range was obtained by using a linear approximation of the problem under consideration. Quantitative estimates of the impact of a layer of biological tissue with attenuation on a radio pulse with Gaussian envelope were obtained. The presence of frequency-dependent attenuation in medium was shown to result in variation of spatial selectivity of antenna during its operation with wideband signals. The estimates of variation of spatial selectivity parameters are presented in case of using the radio pulses with Gaussian envelope.


Keywords


pulse response; wideband signal; ultrawideband signal; UWB; frequency-dependent attenuation; spatial selectivity; near-field region; Fresnel zone; field distribution; resolution; ultrasonic echolocation

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References


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