Design, fabrication and characterization of a bistable electromagnetic microrelay with large displacement
This paper reports the design, fabrication and characterization of a bistable electromagnetic microrelay based on non-silicon surface micromachining technology. It mainly consists of an integrated microcoil at bottom with a spacer, and a suspension spring with a permanent magnet on top. Bistable mechanism is realized by the adoption of the SmCo permanent magnet to hold the microrelay at latching position without current. Switching between two stable states is completed by the variation of current direction in the microcoil. The corresponding power consumption is 25mJ. The fabrication processes of related components are presented. The test result shows that the bistable electromagnetic microrelay can work with low operation voltage pulse of 5V. The output displacement is about 380?m while the response time is about 4.96ms. Besides, the test insertion loss is ?0.02dB and the isolation is ?39.91dB at 30MHz.
bistable electromagnetic microrelay large displacement mems