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Performance of a K-Band Voltage-Controlled Lange Coupler Using a Ferroelectric Tunable Microstrip Configuration

Publication Type

Journal Article

Authors

Subramanyam, G., F.A. Miranda, F. Van Keuls, R.R. Romanofsky, C.L. Canedy, S. Aggarwal, T. Venkatesan, Ramamoorthy Ramesh

DOI

10.1109/75.846924

Abstract

We report for the first time on the performance of a Au/Ba0.6Sr0.4TiO3 (BSTO)/MgO two-layered microstrip voltage-controlled Lange coupler (VCLC) designed for Ku- and K-band frequencies at room temperature. Tight coupling of 3 dB or higher was obtained over a frequency range of 14–19 GHz. At K-band frequencies, the coupling was voltage-controllable using the nonlinear dc electric field dependence of the relative dielectric constant of BSTO (εrBSTo)- The coupling level was improved from —11.6 to —3.7 dB at 20 GHz with an applied dc electric field of 16 kV/cm. The introduction of the ferroelectric tuning layer enhances the bandwidth of the VCLC in comparison with a Lange coupler with no ferroelectric layer. This work demonstrates another advantageous application for ferroelectric thin films in passive microwave components. © 2000, IEEE. All rights reserved.

Journal

IEEE Microwave and Guided Wave Letters

Volume

Year of Publication

2000

ISSN

10518207

Notes

cited By 9

Research Areas

Ramesh Lab