Nanotech 2001 Vol. 1
Nanotech 2001 Vol. 1
Technical Proceedings of the 2001 International Conference on Modeling and Simulation of Microsystems

Applications: MEMS, Sensors Chapter 7

Electromechanical and Microwave S-parameter Properties of a Wide Tuning Range MEMS Tunable Capacitor

Authors: J. Chen, J. Zou, C. Liu and S-M. Kang

Affilation: University of Illinois, China

Pages: 318 - 321

Keywords: tunable capacitor, simulation, S-parameter, dynamic

Abstract:
We present the electromechanical and microwave properties of a novel micromachined parallel-plate tunable capacitor with a wide tuning range. Different from conventional two-parallel-plate tunable capacitors, this novel tunable capacitor consists of one suspended top plate and two fixed bottom plates. One of the two fixed plates and the top plate form a variable capacitor, whereas the other fixed plate and the top plate are used to provide electrostatic actuation for capacitance tuning. For the fabricated prototype tunable capacitors, a maximum tuning range of 69.8% has been achieved experimentally, exceeding the theoretical tuning range limit (50%) of conventional two-parallel-plate tunable capacitors. This novel tunable capacitor also exhibits very low return loss (< 0.6dB between 45 MHz and 10GHz).

Electromechanical and Microwave S-parameter Properties of a Wide Tuning Range MEMS Tunable Capacitor

ISBN: 0-9708275-0-4
Pages: 638