Discrete-time signal processing
Discrete-time signal processing
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Transmission lines analysis in high frequencies needs use of full wave numerical approaches like TLM (Transmission Line Matrix) which is one of the powerful and useful approaches in electromagnetism. It can be used for analysis of structures of geometrical or non-geometrical forms, isotropic, non-isotropic, homogenous or non-homogenous structures and other structures with or without of electrical or magnetic losses. In this paper we use TLM approach to compute the characteristic impedance of microstrips and transmission lines like Planar Waveguide (CPW) and Grounded Planar Waveguide (GCPW). In previous works, εeffect has been used for computing characteristic impedance of transmission lines in high frequencies (several GHz) [1] but calculation of εeffect without using full wave numerical methods is not accurate enough. The lack of accuracy is caused by effect of fringing, effects of thickness, effects of scattering and semi-static conditions. In this paper, we will review TLM network exciting, computation of fields, selecting method for mesh dimensions and timestep. Finally we will present the computation results of characteristic impedance for mentioned structures.