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 be more suitable for accurate calculations of loss as well as the characterization of asymmetrical CPW with finite‐extent ground planes. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2082–2087, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22709

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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].

loss is Ͻ1.6 dB within 13.3-13.9 GHz. The maximum return loss is 26.1 dB at 13.5 GHz and the 3-dB fractional bandwidth is 8.1%. CONCLUSIONA new type of microstrip bandpass filter using one isoscelestriangle-patch resonator with two transmission zeros has been presented. It has been verified by the simulated and measured results. The two transmission zeros are located at 11.7 and 15.9 GHz with levels of 45.7 and 44.9 dB, respectively. This filter has 8.1% of 3-dB bandwidth and 26.1 return loss at 13.5 GHz. The new filter requires only one patch resonator, instead of the conventional (two or) three resonators. Therefore, the filter has a small size, as compared to the conventional filter. There were no gaps in this structure and fabricating uncertainties were reduced. Therefore, this new filter exhibits compactness, simplicity, good performance, and ease of fabrication with good accuracy. QUASISTATIC TEM CHARACTERISTICS OF MULTILAYER ELLIPTICAL AND CYLINDRICAL COPLANAR WAVEGUIDES Volkan Akan and Erdem Yazgan

Recently, printed type antennas are used widely in communication systems since they are low cost and produced easily. Firstly Hallen exposed the relation between thin cylindrical and strip monopole. Then this equivalent radius concept was applied to printed monopole antenna. In this paper relation between printed strip monopole and dielectric coated thin cylindrical monopole has been analyzed analytically and supported numerically.