Quasistatic TEM characteristics of multilayer elliptical and cylindrical coplanar waveguides

Abstract

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

Conductor loss calculation of elliptical, cylindrical coplanar waveguides and coplanar waveguides with finite conductor thickness

“…C 0 and C d capacitances stand for the free-space capacitance and the dielectric layer capacitance, respectively. For the calculation of total unit length capacitance, the partial capacitances C 0 and C d can be obtained using successive conformal transformation steps as studied in [10,15]. So, the overall capacitances per unit length of the both structures are given by, where the air-region capacitances can be expressed as;…”

“…Hence such waveguides have many potential applications in the design of various passive elements like transitions, baluns, and impedance transformers. As known, the electrical parameters of elliptical and cylindrical coplanar waveguide have been investigated by many researchers [6][7][8][9][10][11][12]. Analyses of these transmission lines by using existing numerical approaches need much more calculation time and computer resources.…”

“…Then, CPW structure was analyzed as elliptical and cylindrical configurations [8][9][10][11]. Furthermore, the effect of conductor thickness on the characteristic impedance for CCPW has studied in [12].…”

Designs and Analyses of Some Rf/Microwave Passive Elements on Cylindrical CPWS

“…1, cross sectional view of the transmission line used to form CCPW discontinuities is seen with defined physical parameters. The characteristic impedance and effective dielectric constant of CCPW can be calculated as follows [3,4,9] …”

“…It is possible to construct cylindrical and/or elliptical transmission lines using appropriate dielectric materials easily. Up to date there are some studies about non-planar transmission lines to evaluate characteristic parameters of them analytically and accurately [1][2][3][4][5]. In addition, various planar and cylindrical CPW discontinuities have been analyzed in [6][7][8] …”