Reflection-Type Ferroelectric Phase Shifter With Defected Ground Structure

Abstract

In order to obtain a low-loss ferroelectric phase shifter, we were designed and fabricated the reflection-type ferroelectric phase shifter with the defected ground structure (DGS) resonators. The ferroelectric phase shifter is consisted of a 3-dB 90° branch-line hybrid coupler and terminated reflective circuit with tunable ferroelectric DGS resonator which can provide a high Q resonator characteristic at high frequencies. The design parameters of equivalent circuit for the tunable DGS resonator are derived by circuit analysis method and three-dimensional full wave finite element method. At 13.5 GHz, the fabricated phase shifter exhibited an insertion loss of better than 3.4 dB.

Keywords:

• Reflection-type phase shifter
• low-loss ferroelectric phase shifter
• DGS resonator

ACKNOWLEDGEMENTS

The authors would like to thank Dr. W. J. Kim for a helpful discussion. This work was supported by the Minister of Information and Communications Department of Korea.