@article{1739ae462ff3442cbe2429def76ab75b,
title = "Transient coupling reduction and design considerations in edge-coupled coplanar waveguide couplers",
abstract = "Edge-coupled coplanar waveguide (CPW) forward directional couplers are studied using an even/odd mode analysis. Specific height combinations of multilayer substrates are found which equalize the phase velocities of the even and odd modes. These modal velocity equalization points are seen to be relatively constant over a wide band of frequencies. Results of simulated pulse distortion are presented in a multilayer compensated structure showing a dramatic reduction in transient signal coupling and overall distortion. Design considerations for practical circuit designs are also discussed.",
author = "Lyons, {Michael R.} and Constantine Balanis",
note = "Funding Information: characteristics in CPW{\textquoteright}s and other planar circuits, the spectral directional coupler. domain approach (SDA) is often chosen for its efficiency and speed. Multilayer substrate and superstrate configurations are readily considered using a simple recursive formulation for the spectral do- main admittance terms [6].P icosecond pulse propagation on isolated CPW{\textquoteright}s has also been studied for selected suspended configurations [7], [8]. However, the circuit complexity is increased when an additional CPW is introduced into the system as in edge-coupled CPW directional couplers. In this coupled configuration, the circuit is conveniently analyzed using an evedodd mode approach [6], [9]. Propagation characteristics of edge-coupled CPW forward directional couplers have also been studied [lo], and pulse propagation analysis has also been presented [9]. However, no analysis leading to transient coupling reduction over a wide range of parameters in edge-coupled CPW forward directional couplers has yet been reported. This paper utilizes a full-wave spectral domain analysis to charac- terize the evedodd mode phase constants and address pulse distortion Manuscript received November 14, 1994; revised January 17, 1996. This work was supported by the U.S. Army Research Office Grant DAAL03-92- G-0262. The authors are with the Department of Electrical Engineering,T elecommu- nications Research Center, Arizona State University, Tempe, AZ 85287-7206 USA. Publisher Item Identifier S 0018 -9480(96)03034-7.",
year = "1996",
doi = "10.1109/22.493932",
language = "English (US)",
volume = "44",
pages = "778--783",
journal = "IEEE Transactions on Microwave Theory and Techniques",
issn = "0018-9480",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "5",
}