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The chapter presents the derivation of a 2D time domain model of two bare conducting convex obstacles. The model includes amplitude diffraction and first-order transition zone diffraction, called the slope diffraction. The considered model is represented by its impulse response. Thanks to the introduction of some vital approximations of the expressions occurring in amplitude term and slope term of...
The paper presents a new approach to time-domain effective simulation of ultra-wideband (UWB) electromagnetic (EM) wave propagation when a source is placed on convex obstacle. The frequency domain uniform theory of diffraction (UTD) and rational approximation exploiting the vector fitting algorithm (VF) is used for deriving the closed form time domain functions of the radiated and coupled fields.
In this paper we introduce the new approach for the derivation of a simple in form UTD impulse responses of a convex object in the form of 2D cylinder. We focus in the paper on the diffraction phenomenon. The impulse responses can be derived for impedance as well as dielectric object case. The impulse responses can be used for simulations of UWB EM wave propagation in channels containing convex obstacles...
Omówiono modelowanie i symulację bezprzewodowego kanału szerokopasmowego zawierającego przeszkody wypukłe oraz połączeń w szybkich układach cyfrowych VLSI. Dyfrakcja jako główny czynnik wpływający na zniekształcenia sygnału w kanale szerokopasmowym decydująco wpływa na transmitancję kanału wyrażoną za pomocą funkcji specjalnych. Celem pracy jest aproksymacja transrnutancji funkcją wymierną przy wykorzystaniu...
The paper presents the derivation of a 2D time-domain model of two bare conducting convex obstacles for the case of UWB baseband signal propagation. The model includes amplitude diffraction and first order transition zone diffraction, called the slope diffraction. The considered model is represented by its impulse response. Thanks to the introduction of some vital approximations of the expressions...
In the paper there is presented the 2D time-domain model of two bare convex obstacles model, which includes an application of an amplitude and the first order transition zone diffraction process, called slope diffraction. The considered model is represented by its impulse response. Thanks to the usage of some approximations the formulation for this impulse response can be presented in a closed form...
We consider time domain (TD) modelling of diffraction of a signal, caused by 2D conducting convex objects for soft polarization case. Two models of the amplitude term of the time domain convex obstacle diffraction coefficient are proposed and compared. One model is derived using an analytical-numerical method and the other is obtained in a purely analytical way. Both methods use uniform geometrical...
In the paper we present the way of obtaining the time domain model of the Bertoni's frequency domain model of the hill presented in (H.L. Bertoni, 2000). Direct time domain analyses are more convenient when we consider the UWB propagation mechanism. The Bertoni's frequency domain model was derived through the usage of the uniform theory of diffraction (UTD) presented by P. H. Pathak (1979). Here the...
In the paper there is derived the 2D time-domain model of a bare convex obstacle model, which includes an application of an amplitude and the first order transition zone diffraction process, called slope diffraction. It is done trough the usage of an UTD formulated for a frequency domain. The obtained result can be useful for the time-domain modelling of a channel containing bare convex objects.
In this paper we use the uniform geometrical theory of diffraction in time domain to model distortion of a particular UWB pulse in the channel containing hill. The distortion of an UWB pulse is difficult to model using statistical measurements, therefore it is better to do this in a deterministic way, as it is in the case of the UTD. UTD related to electromagnetic wave scattering by convex surfaces...
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