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    Analyses of Elliptical Coplanar Coupled Waveguides and Coplanar Coupled Waveguides With Finite Ground Width
    (IEEE-İnst Electrical Electronics Engineers Inc, 2006) Duyar, Mehmet; Akan, Volkan; Yazgan, Erdem; Bayrak, Mehmet
    In this paper, the quasi-TEM characteristic parameters of elliptical coplanar coupled waveguides and coupled coplanar waveguide with a finite ground width configuration are presented and analyzed. Computer-aided design (CAD)-oriented fast, simple, and accurate analytic formulas are derived by using conformal mapping techniques, which provide satisfactory accuracy at microwave frequencies and lead to closed-form analytical solutions suitable for CAD software packages. The results for the odd- and even-mode characteristic impedance, effective dielectric constant, and coupling coefficient have been computed by these formulas. Good agreement between the present results and published results [1] is observed. For the planar case, simulations have also been undertaken with Sonnet electromagnetic-circuit solver software. The computed results agree well with those of the simulation ones.
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    Analytical attenuation calculation of asymmetrical coplanar waveguide with finite-extent ground planes for coplanar waveguide mode
    (JOHN WILEY & SONS INC, 2007) Duyar, Mehmet; Akan, Volkan; Yazgan, Erdem; Bayrak, Mehmet
    In this study, fast and new analytical formulations have been presented for correct loss calculations in asymmetrical coplanar waveguides (CPW) with finite-extent ground planes for CPW mode. To generalize loss analysis for CPW mode, not only gaps but also finite ground planes are assumed as asymmetric. Moreover, dielectric thickness and ground plane widths are considered as finite for this transmission line. Another important concept presented in this article is that the proposed expressions are easily applicable for CAD platforms. Through the analyses, conformal mapping techniques (CMT) have been employed. The obtained results in this work have been compared with the results of other similar studies (spectral domain method, mode matching, etc.) available in the literature. These comparisons indicate that the expressions developed in this study are found to he more suitable for accurate calculations of loss as well as the characterization of asymmetrical CPW with finite-extent ground planes. (C) 2007 Wiley Periodicals, Inc.
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    Conductor loss calculation of elliptical, cylindrical coplanar waveguides and coplanar waveguides with finite conductor thickness
    (IOS PRESS, 2009) Duyar, Mehmet; Akan, Volkan; Yazgan, Erdem; Bayrak, Mehmet
    In this paper, new and fast analytical formulations have been presented for conductor loss calculations of elliptical (ECPW) and cylindrical coplanar waveguide (CCPW) with finite conductor thickness. These expressions are derived using conformal mapping techniques (CMT) and the validity of them is established by comparing the numerical results in the literature. These comparisons indicate that for the same conductor thickness the conductor losses of elliptical and cylindrical coplanar waveguide are higher than the conductor losses of coplanar waveguide presented in [1]. Calculation method developed in this study is an extension of the approximate technique proposed by Ghione [1].
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    Quasi-static solutions of elliptical, cylindrical-coupled parallel coplanar waveguide, and coupled parallel coplanar waveguide with finite ground planes
    (JOHN WILEY & SONS INC, 2007) Duyar, Mehmet; Akan, Volkan; Yazgan, Erdem; Bayrak, Mehmet
    This article presents the quasi-static analyses of elliptical-coupled parallel coplanar waveguide (ECP CPW), cylindrical-coupled parallel coplanar waveguide (CCP CPW), and coupled parallel coplanar waveguide (CP CPW) with finite ground planes. Conformal-mappi ng techniques have been used through the analyses. The obtained results show good agreement with IE3D electromagnetic-circuit solver software's simulations for the planar case. In addition, the results have been compared with others available in the literature. (C) 2007 Wiley Periodicals, Inc.
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    Two novel transmission lines with vertical conductors added to ground planes
    (JOHN WILEY & SONS INC, 2007) Duyar, Mehmet; Akan, Volkan; Yazgan, Erdem; Bayrak, Mehmet
    In this article, two different novel Coplanar Waveguides (CPW) structures have been proposed and analyzed. The CPW structures proposed provide flexibility for practical applications. For the analyses, conformal mapping techniques were employed. The closed form analytical expressions arc generally suitable for usage in CAD-oriented microwave circuit design. Both the structures have been simulated for quasi-TEM mode in a 3D commercially available software. In addition, the results obtained in this work have been compared with the others available in the literature. Simulations and comparisons give support to the validity of the obtained analytical expressions in this study. (C) 2007 Wiley Periodicals, Inc.