Guided-wave characteristics of periodic coplanar waveguides with inductive loading - unit-length transmission parameters

Periodic coplanar waveguides (CPWs) with inductive loading are thoroughly studied by resorting to unit-length transmission parameters, i.e., propagation constant and characteristic impedance, of an equivalent dispersive and/or lossy transmission line. The admittance-type method of moments (MoM) is at first formulated to full-wave modeling of a finite-cell periodic CPW with the two feeding lines and then the short-open-calibration procedure is carried out to deembed the two-port ABCD matrix of the core periodic CPW section. Thus, the above two parameters can be extracted from the MoM simulation to exhibit their guided-wave characteristics, i.e., slow-wave and bandstop behaviors. It is demonstrated for the first time that, within the bandstop or bandgap, the propagation constant must become complex with a nonzero attenuation constant, while the characteristic impedance appears purely imaginary. Three periodic CPW circuits with six finite cells are then characterized on a basis of the transmission-line theorem and the derived S-parameters are validated by Momentum simulation and RF measurement.

[1]  Ke Wu,et al.  Short-open calibration technique for field theory-based parameter extraction of lumped elements of planar integrated circuits , 2002 .

[2]  Hung-Yu David Yang,et al.  Theory of microstrip lines on artificial periodic substrates , 1999 .

[3]  Adnan Görür,et al.  Characteristics of periodically loaded CPW structures , 1998 .

[4]  D. L. Jaggard,et al.  A comprehensive study of discontinuities in chirowaveguides , 2002 .

[5]  Ke Wu,et al.  Comments on Revisiting characteristic impedance and its definition of microstrip line with a self-c , 1999 .

[6]  Tapan K. Sarkar,et al.  Dynamic analysis of a microstrip line over a perforated ground plane , 1994 .

[7]  Lie Zhu,et al.  Unified 3-D definition of CPW- and CSL-mode characteristic impedances of coplanar waveguide using MOM-SOC technique , 2003 .

[8]  Arthur A. Oliner.  Periodic Structures and Photonic-Band-Gap Terminology: Historical Perspectives , 1999, 1999 29th European Microwave Conference.

[9]  Hsien-Shun Wu,et al.  Electric-magnetic-electric slow-wave microstrip line and bandpass filter of compressed size , 2002 .

[10]  Tatsuo Itoh,et al.  Miniature low-loss CPW periodic structures for filter applications , 2001 .

[11]  I. Wolff,et al.  A Spectral-Domain Analysis of Periodically Nonuniform Microstrip Lines , 1987 .

[12]  Ke Wu,et al.  Revisiting characteristic impedance and its definition of microstrip line with a self-calibrated 3-D MoM scheme , 1998 .

[13]  R. Coccioli,et al.  Planar PBG Structures: Basic Properties and Applications , 2000 .

[14]  Lei Zhu.  Realistic equivalent circuit model of coplanar waveguide open circuit: lossy shunt resonator network , 2002 .

[15]  Ke Wu,et al.  Unified equivalent-circuit model of planar discontinuities suitable for field theory-based CAD and optimization of M(H)MIC's , 1999 .

[16]  Ke Wu,et al.  Model-based characterization of finite-periodic finite-ground coplanar waveguides , 1999, 1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473).

[17]  Tatsuo Itoh,et al.  Simulation and experiment of photonic band-gap structures for microstrip circuits , 1997, Proceedings of 1997 Asia-Pacific Microwave Conference.