Design and fabrication of a single membrane push-pull SPDT RF MEMS switch operated by electromagnetic actuation and electrostatic hold

Il Joo Cho, Euisik Yoon

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

In this paper, we report a new push-pull-type SPDT (single pole double throw) switch actuated by the combination of electromagnetic and electrostatic forces for low power and low voltage operation. The switch is initially actuated by large electromagnetic force to change its state and is held to maintain its state by applying electrostatic force to reduce static power consumption. The electromagnetic force can be easily generated at low voltage. The maximum actuation voltage is below 4.3 V and the required energy is 15.4 νJ per switching. It achieves signal isolation of -54 dB and insertion loss of -0.16 dB at 2 GHz, respectively. For 20 GHz operation, isolation and insertion loss were measured as -36 dB and -0.52 dB, respectively. The proposed SPDT switch combines two switching elements in a single structure, simplifying the overall structure and control signals and eliminating mismatches between the two switching elements. The dimension of the switch has been optimized using FEM simulation and analytical calculations. We have successfully carried out a lifetime test over more than 166 million cycles with the maximum actuation voltage below 4.3 V.

Original languageEnglish
Article number035028
JournalJournal of Micromechanics and Microengineering
Volume20
Issue number3
DOIs
Publication statusPublished - 2010 Mar 12

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MEMS
Electrostatics
Poles
Switches
Membranes
Fabrication
Electrostatic force
Electric potential
Insertion losses
Electric power utilization
Finite element method

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

Cite this

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abstract = "In this paper, we report a new push-pull-type SPDT (single pole double throw) switch actuated by the combination of electromagnetic and electrostatic forces for low power and low voltage operation. The switch is initially actuated by large electromagnetic force to change its state and is held to maintain its state by applying electrostatic force to reduce static power consumption. The electromagnetic force can be easily generated at low voltage. The maximum actuation voltage is below 4.3 V and the required energy is 15.4 νJ per switching. It achieves signal isolation of -54 dB and insertion loss of -0.16 dB at 2 GHz, respectively. For 20 GHz operation, isolation and insertion loss were measured as -36 dB and -0.52 dB, respectively. The proposed SPDT switch combines two switching elements in a single structure, simplifying the overall structure and control signals and eliminating mismatches between the two switching elements. The dimension of the switch has been optimized using FEM simulation and analytical calculations. We have successfully carried out a lifetime test over more than 166 million cycles with the maximum actuation voltage below 4.3 V.",
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