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A finite volume discretization of the mixed form of Richards' equation leads to a nonlinear numerical model which yields exact local and global mass conservation. The resulting nonlinear system requires sophisticated numerical strategies, especially in a variable saturated flow regime. In this paper a nested, Newton-type algorithm for the discretized Richards' equation is proposed and analyzed. With a judicious choice of the initial guess, the quadratic convergence rate is obtained for any time step size and for all flow regimes.

In this paper, the nonoverlapping domain decomposition methd (NDDM) is used to compute the capacitance matrix of multiconductor transmission lines in multilayer dielectric media. The subdomains with pure dielectric layers are analyzed using the method of lines (MoL), and fast Fourier transform (FFT) is introduced to reduce the computing time, while the subdomains with conductors are analyzed using the finite-difference method. The numerical results show that the Figure 2 Sensitivity as a function of normalised fibre bandwidth with n ϭ 32 for (i) central decision detection and (ii) raised cosine detectionFigure 3 Sensitivity as a function of PPM coding level M with f n ϭ 10 for (i) central decision detection and (ii) raised cosine detection 794algorithm is efficient, and the computing time and memory needs are unrelated to the thickness of the pure dielectric layers. In addition, the effect of the uneven dielectric division on the electromagnetic parameter is also investigated.ABSTRACT: An even-mode multiport network model (MNM) for rectangular microstrip antenna, which reduces computation time to evaluate the input impedance, is discussed. This concept is used to analyze various dual-band slotted antennas such as a U-slot loaded rectangular microstrip antenna, an E-shaped microstrip antenna, and a rectangular microstrip antenna with a pair of slots.

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