Fast and simple CAD‐oriented analytical expressions for the characteristic impedance and the effective permittivity of asymmetric coplanar waveguides and coplanar strip lines are derived using the conformal mapping method. It has been found that the results calculated using analytical expressions obtained in the present article are in very good agreement with the analytical and experimental results given in the literature. The formulas derived in this study have also been verified to be valid for symmetric coplanar waveguide and strip lines. © 1995 John Wiley & Sons, Inc.

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A novel type of dual-mode microstrip bandpass filter using degenerate modes of a dual-mode microstrip square loop resonator with capacitively loaded open-loop arms is proposed. Such a dual-mode bandpass filter with a 0.75% bandwidth at the center frequency of 1.603 GHz is designed and fabricated to demonstrate the design of reduced-size microstrip filters. It is shown that the proposed filter has a size reduction of about 59% at the same center frequency, as compared with the dual-mode bandpass filters such as microstrip patch, cross-slotted patch, square loop and ring resonator filter.

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CAD-oriented analytic formulas are presented for calculating the quasistatic ( ) parameters of the conductor-backed asymmetric coplanar waveguide ACPW , the ACPW with upper shielding, and the conductor-backed ACPW with upper shielding using conformal mapping techniques. The effect of the presence of the upper shielding and the conductor-backing on the quasistatic TEM parameters is discussed. It is also presented that the expressions derived in this work can be used for calculating the quasistatic parameters of various symmetric and asymmetric CPWs. ᮊ 1999 John Wiley & Sons, Inc. Int J RF and Microwave CAE 9: 394᎐402, 1999