New and very simple synthesis formulas for coplanar strip line

Very simple and accurate closed-form formulas obtained by using the curve-fitting technique are presented for coplanor strip (CPS) synthesis. The average percentage error is found to be 1.56% for 2524 CPS samples having different electrical parameters and physical dimensions, as compared with the results obtained from the quasi-static analysis. (C) 2004 Wiley Periodicals, Inc

Closed-form design equations for asymmetric coplanar strip line with an infinitely wide strip

This article presents very simple closed-form design equations to calculate the geometrical dimensions of asymmetric coplanar strip line with an infinitely wide strip (CPSIWS). The coefficients of the design equations are determined by artificial bee colony algorithm (ABCA) that is a powerful optimization technique. The results of the proposed design equations are compared with the results of other design equations, experimental works previously published in the literature, quasi-static analysis in the literature, and IE3D software. Accuracy of the characteristic impedances calculated by the design equation results proposed in this work is found to be better than 0.53% with respect to the desired characteristic impedances for 1,960 asymmetric CPSIWS samples

Simple models based on neural networks for suspended and inverted microstrip lines

This paper presents new and simple models based on artificial neural networks (ANNs) to determine the effective permittivities of suspended microstrip (SM) and inverted microstrip (IM) lines. The neural results are in very good agreement with the theoretical and experimental results available in the literature,for both SM and IM lines. (C) 2003 Wiley Periodicals, Inc

Quasi-static models based on artificial neural networks for calculating the characteristic parameters of multilayer cylindrical coplanar waveguide and strip line

© 2008, Electromagnetics Academy.In this paper, two different neural models are proposed for calculating the quasi-static parameters of multilayer cylindrical coplanar waveguides and strip lines. These models were basically developed by training the artificial neural networks with the numerical results of quasi-static analysis. Neural models were trained with four different learning algorithms to obtain better performance and faster convergence with simpler structure. When the performances of neural models are compared with each other, the best test results are obtained from the multilayered perceptrons trained by the Levenberg- Marquardt algorithm. The results obtained from the neural models are in very good agreements with the theoretical results available in the literature

Synthesis formulas for conductor-backed coplanar waveguide

Simple and accurate formulas are presented for the synthesis of conductor-hacked coplanar waveguide (CPW). These formulas are derived by applying function approximation and curve-fitting technique to the respective quasi-static analysis results. The results obtained from these formulas are compared with the results of quasi-static analysis and experimental works available in the literature. Average percentage error is found to be better than 1% for 1086 conductor-backed CPW samples having different electrical parameters and geometrical dimensions. (C) 2008 Wiley Periodicals, Inc

VERY SIMPLE AND ACCURATE COMPUTER-AIDED-DESIGN (CAD) MODELS DEVELOPED BY GENETIC PROGRAMMING FOR THE QUASI-STATIC ANALYSIS OF UNSHIELDED SUSPENDED AND INVERTED MICROSTRIP LINES

Very simple computer-aided-design models are introduced to determine the characteristic parameters such as effective permittivities and characteristic impedances of unshielded suspended and inverted microstrip lines. Computer-aided-design models are determined with the use of the genetic programming. The results of computer-aided-design models are compared with the results of quasi-static analysis, experimental works available in the literature and a commercial electromagnetic simulator. The comparison results clearly show that computer-aided-design models proposed in this work are in very good agreement with the simulation, theoretical and experimental results for the suspended and inverted microstrip lines. The design parameter ranges in this work are 2 <= epsilon(r2) <= 20, 0.5 <= w/b <= 10, 0.1 <= a/ b <= 1.5, and the respective characteristic impedances of unshielded suspended and inverted microstrip lines are 28 Omega <= Z(0) <= 185 Omega, and 24 Omega <= Z(0) <= 159 Omega, respectively. It is observed that the accuracies of computer-aided-design models proposed in this paper are good enough for the most practical cases

Very simple synthesis formulas for microcoplanar striplines

Accurate and very simple synthesis formulas for the microcoplanar strip (MCS) lines are presented. They are very useful for microwave engineers to easily and accurately compute the physical dimension of MCS lines. The coefficients in the synthesis formulas are determined with the use of artificial bee colony algorithm. The results of the synthesis formulas are compared with the results of respective quasi-static analysis, other synthesis formulas, and experimental works available in the literature to show the validation of synthesis formulas presented in this article. The average percentage error is calculated 3.07% for 864 MCS line samples having different electrical parameters and physical dimensions. (C) 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:615619, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.2737

New and very simple CAD models for coplanar waveguide synthesis

This paper presents new, very simple, accurate closed-form formulas obtained by using the curve-fitting technique for coplanar waveguide synthesis. The results achieved from this work are compared to the results obtained from the quasi-static analysis and the synthesis formulas proposed by other researchers, as well as experimental works available in the literature. (C) 2004 Wiley Periodicals, Inc