LIU Jia1, GAO Yang2, BAI Zhu-chuan1, et al. Design of low threshold voltage k-band capacitive RF MEMS switch[J]. 2008, (9): 75-77+81. DOI: 10.13873/j.1000-97872008.09.018.
A low threshold voltage capacitive RF MEMS switch is designed.The switch consists of double drive electrodes and suspended metallic membrane supported by flexible serpentine springs over a coplanar waveguide.MEMS CAD software CoventorWare and microwave CAD software HFSS are used to simulate mechanical and electromagnetic characteristics of the RF MEMS switch respectively.Simulation result demonstrates that threshold voltage of the switch is 2.5V
which achieves goal of the design.The insertion loss of up state is about 0.23dB@20GHz
and the isolation of down state is about 18.1dB@20GHz.Micromachining process of the RF MEMS switch is also outlined.