TY - JOUR
KW - Thin films
KW - Permittivity
KW - Ferroelectric devices
KW - Electric field effects
KW - Barium titanate
KW - Barium strontium titanate
KW - Waveguide couplers
KW - Bandwidth
KW - Dielectric films
KW - Gold
KW - Microstrip devices
KW - Voltage-controlled Lange couplers (VCLC)
AU - G Subramanyam
AU - F.A Miranda
AU - F Van Keuls
AU - R.R Romanofsky
AU - C.L Canedy
AU - S Aggarwal
AU - T Venkatesan
AU - Ramamoorthy Ramesh
AB - 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.
BT - IEEE Microwave and Guided Wave Letters
DO - 10.1109/75.846924
LA - eng
M1 - 4
N1 - cited By 9
N2 - 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.
PY - 2000
SP - 136
EP - 138
T2 - IEEE Microwave and Guided Wave Letters
TI - Performance of a K-Band Voltage-Controlled Lange Coupler Using a Ferroelectric Tunable Microstrip Configuration
VL - 10
SN - 10518207
ER -