Scaling issues in ferroelectric barium strontium titanate tunable planar capacitors

Peter G. Lam, Vrinda Haridasan, Zhiping Feng, Michael B. Steer, Angus I. Kingon, Jon-Paul Maria

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We report on the geometric limits associated with tunability of interdigitated capacitors, specifically regarding the impact of a parasitic non-tunable component that necessarily accompanies a ferroelectric surface capacitor, and can dominate the voltage-dependent response as capacitor dimensions are reduced to achieve the small capacitance values required for impedance matching in the X band. We present a case study of simple gap capacitors prepared and characterized as a function of gap width (i.e., the distance between electrodes) and gap length (i.e., the edge-to-edge gap distance). Our series of measurements reveals that for gap widths in the micrometer range, as gap lengths are reduced to meet sub-picofarad capacitance values, the non-tunable parasitic elements limit the effective tunability. These experimental measurements are supported by a companion set of microwave models that clarify the existence of parallel parasitic elements.

Original languageEnglish (US)
Article number6156821
Pages (from-to)198-204
Number of pages7
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume59
Issue number2
DOIs
StatePublished - Feb 1 2012

Fingerprint

Barium strontium titanate
strontium
Ferroelectric materials
barium
capacitors
Capacitors
scaling
Capacitance
capacitance
impedance matching
Microwaves
superhigh frequencies
Electrodes
micrometers
Electric potential
microwaves
electrodes
electric potential

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Acoustics and Ultrasonics
  • Instrumentation

Cite this

Lam, Peter G. ; Haridasan, Vrinda ; Feng, Zhiping ; Steer, Michael B. ; Kingon, Angus I. ; Maria, Jon-Paul. / Scaling issues in ferroelectric barium strontium titanate tunable planar capacitors. In: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 2012 ; Vol. 59, No. 2. pp. 198-204.
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Scaling issues in ferroelectric barium strontium titanate tunable planar capacitors. / Lam, Peter G.; Haridasan, Vrinda; Feng, Zhiping; Steer, Michael B.; Kingon, Angus I.; Maria, Jon-Paul.

In: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol. 59, No. 2, 6156821, 01.02.2012, p. 198-204.

Research output: Contribution to journalArticle

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