Title :
Method for improving microstrip coupler directivity
Author :
Shibata, Kenji ; Yanagisawa, H. ; Torimura, Y. ; Hatori, Kenji
Author_Institution :
Kitami Institute of Technology, Kitami, Japan
Abstract :
This letter describes a method for improving the directivity of the edge-coupled microstrip couplers; the coupler is made up of the suspended microstrip lines. The gap between the dielectric substrate and the ground plane is adjusted to get equal mode velocities under perfect matching conditions. Design data for optimum structure and experimental results are presented and discussed.
Keywords :
directional couplers; strip line components; dielectric substrate; directional coupler; edge-coupled microstrip couplers; equal mode velocities; ground plane; microstrip coupler directivity; perfect matching conditions; suspended microstrip lines;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19810514
