Title :
A new systematic and efficient method of analysis for conductor-backed coplanar-waveguide directional couplers
Author :
Wu, C.H. ; Uysal, S.
Author_Institution :
Dept. of Electr. Eng., Nat. Univ. of Singapore, Singapore
fDate :
7/1/1999 12:00:00 AM
Abstract :
This paper presents a set of newly developed computer-aided-design-oriented formulas for the evaluation of the quasi-static even- and odd-mode characteristics of conductor-backed coplanar-waveguide (CBCPW) coupled lines. This set of expressions is evaluated using a conformal mapping method based on the assumption of pure transverse-electromagnetic propagation. The result for the odd- and even-mode characteristic impedance and effective dielectric constants computed by these formulas agrees well with the result evaluated from the existing formulas of both Wadell (1991) and Hanna (1985). However, the new expressions derived provide a more systematic and efficient method for calculating the essential parameters of CBCPW coupled lines as compared to the existing ones
Keywords :
coplanar waveguide components; coupled transmission lines; directional couplers; electric impedance; permittivity; waveguide theory; CAD-oriented formulas; CPW coupled lines; characteristic impedance; computer-aided-design; conductor-backed CPW directional couplers; conformal mapping method; coplanar-waveguide directional couplers; effective dielectric constant; pure TEM propagation; quasi-static even-mode characteristics; quasi-static odd-mode characteristics; transverse-electromagnetic propagation; Capacitance; Conformal mapping; Coplanar waveguides; Coupling circuits; Dielectric constant; Directional couplers; Frequency; Heat sinks; Impedance; Insertion loss;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
