Efficient Analysis of Multiple Microstrip Transmission Lines With Anisotropic Substrates (original) (raw)
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Mode matching analysis of the coplanar microstripline on a layered dielectric substrate
1989
In this project, mode matching was used to calculate the propagation constant and the characteristic impedance of a coplanar coupled microstrip line. The Striplines are considered to be perfect electric conductors of negligible thickness, and are separated from the ground plane by three layers of dielectric material. The layer with the higher dielectric constant is sandwiched between two layers of lower dielectric constants, such that the field is confined to this middle layer, which is called the conducting layer of the microstrip line. By confining the field to this layer, losses at the metal conductor are minimized.
Multilayered Transmission Lines on Quasi-planar Substrates with Anisotropy
2018
Microstrip structures are very widely used in antennas and microwave devices for navigation and communication systems in transport, aeronautics and space. Often there is need to integrate them into the surface of aircraft, satellites and vehicles, which leads to the structures to be conformal. New, lightweight materials (e.g. CFK) are being used more and more exhibiting multilayers with anisotropic behavior. Since the substrate material strongly affects the properties of the structures, the microwave circuit elements need to be modelled very precisely and fast numerical procedures are required to predict their characteristics. This contribution presents the extension of an efficient numerical method, i.e. the discrete mode matching (DMM) to analyze conformal structures with anisotropic materials. This method uses the exact eigen-values of the waveguide modes, which are dependent on the lateral boundary conditions. It requires only 1D discretization along the horizontal tangential di...
IEEE Transactions on Microwave Theory and Techniques, 2018
A simple procedure to analyze multilayered transmission lines with circular or quasi-circular uniaxial anisotropic dielectric layers is presented. It is based on an extension of the discrete mode matching method to analyze conformal structures with anisotropy. A generalized relation of the field components, which can be represented by a full-wave hybrid matrix for each layer, is used and then the dyadic Green's function is obtained using a full-wave equivalent circuit of the structure. The application is demonstrated by computing dispersion characteristics for graded-index optical fibers, elliptical waveguides, and elliptical stripline structures with uniaxial anisotropic dielectric.
Full-Wave analysis of microstrip lines with variable thickness substrates using the method of lines
IEICE Electronics Express, 2004
In this paper, we present a full-wave analysis of microstrip lines printed on variable thickness substrates using the method of lines (MoL). The propagation constant of a microstrip line in the interface of one dielectric is computed as a function of different shape characteristics. The results are compared with those obtained in previous research, especially with those using the discrete mode matching technique (DMM). Good agreement is found between the results. Furthermore, the convergence behavior of the method of lines is examined and finally, we show some numerical results, obtained with analyzing this structure in a large band of frequencies.
Accurate Analysis of Microstrip Lines on Lossy Biaxial Anisotropic Substrates
International Journal of Infrared and Millimeter Waves - INT J INFRAR MILLIM WAVE, 2000
We have studied the behavior of the microstrip lines on lossy biaxial anisotropic dielectric substrates. A spectral-domain moment method is used with the Galerkin testing procedure to determine the dispersion characteristics of single and coupled lines. Modes of both even and odd symmetries are included. It is found that the anisotropy of the substrate has a significant influence on the propagation characteristics. The theory is verified by comparison with previously published data.
IEE Proceedings H Microwaves, Antennas and Propagation, 1985
In the paper, a simple recurrence formula to obtain the Green's function for multilayered anisotropic structures, with rectangular boundary conditions involving electric and magnetic walls and open boundaries, allows us to present an unified variational approach in the spectral domain to find both upper and lower bounds on the mode capacitances of a large class of planar transmission structures. Very accurate results are obtained by using appropriate trial functions to approximate the surface charge density on the strips and the interface potential distribution for several significant MIC configurations.
An approximate parallel-plate waveguide model of a lossy multilayered microstrip line
Microwave and Optical Technology Letters, 2005
has been achieved. Slight discrepancies are due to mechanical tolerances of the fabricate prototype, which was built using mechanical etching . The total dimension of the filter is 35.0 mm, corresponding to 50% of the size of a conventional E-plane filter with same specifications. The upper 3-dB cutoff frequency is 9.49 GHz and more than 10-dB attenuation has been achieved at 9.5 GHz due to the finite transmission zero.
IEEE Transactions on Microwave Theory and Techniques, 1991
A newly proposed and tested full-wave mixed potential mode-matching method is presented for the analysis of planar and/or quasi-planar transmission lines. The transmission lines under investigation consist of layered (stratified) and nonlayered dielectric substrates and metal strips of finite thickness. The y-directed hybrid TE and TM Hertzian potentials, perpendicular to the interfaces between each layered region, are employed in the layered regions. The nonlayered regions, which consist of dielectric step discontinuities that destroy the layered configuration in the horizontal plane, utilize the x-directed hybrid TE and TM Hertzian potentials parallel to the horizontal plane. As a direct result, the full-wave formulation of the transmission line problem becomes systematic and easy to handle. Extensive analyses of a particular case study show that the relative convergence criterion needs to be satisfied to obtain accurate electromagnetic field solutions. The theoretical results obtained here are in very good agreement with the published data for various transmission line structures, which are the special limiting cases of the particular case study. The applications of the new formulation to the proximity effects of microstrip and Microslab' lines are also illustrated by examples.