Varactor-tuned microstrip ring resonators with new enhanced coupling structure

Abstract

In this paper, varactror‐tuned microstrip ring resonators with two coupled lines and a slit are presented. These ring resonators with a single or double varactor have been suggested to improve the insertion and return losses and the tuning bandwidth. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 20: 211–214, 1999.