@article{33772,
  keywords = {thin films, Permittivity, Ferroelectric devices, Electric field effects, Barium titanate, Barium strontium titanate, Waveguide couplers, Bandwidth, Dielectric films, Gold, Microstrip devices, Voltage-controlled Lange couplers (VCLC)},
  author = {G Subramanyam and F.A Miranda and F Van Keuls and R.R Romanofsky and C.L Canedy and S Aggarwal and T Venkatesan and Ramamoorthy Ramesh},
  title = {Performance of a K-Band Voltage-Controlled Lange Coupler Using a Ferroelectric Tunable Microstrip Configuration},
  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.},
  year = {2000},
  journal = {IEEE Microwave and Guided Wave Letters},
  volume = {10},
  number = {4},
  pages = {136-138},
  issn = {10518207},
  doi = {10.1109/75.846924},
  note = {cited By 9},
  language = {eng},
}