By a News Reporter-Staff News Editor at Journal of Technology -- Researchers detail new data in Microwave Research. According to news reporting originating in Stockholm, Sweden, by VerticalNews journalists, research stated, "This paper presents a novel concept of a millimeter-wave waveguide switch based on amicroelectromechanical (MEMS)-reconfigurable surface with insertion loss and isolation very similar to high performance but bulky rotary waveguide switches, despite its thickness of only 30 mu m. A set of up to 1470 micromachined cantilevers arranged in vertical columns are actuated laterally by on-chip integrated MEMS comb-drive actuators, to switch between the transmissive state and the blocking state. In the blocking state, the surface is reconfigured so that the wave propagation is blocked by the cantilever columns short-circuiting the electrical field lines of the TE10 mode."
The news reporters obtained a quote from the research from the School of Electronics Engineering, "A design study has been carried out identifying the performance impact of different design parameters. The RF measurements (60-70 GHz) of fabricated, fully functional prototype chips show that the devices have an isolation between 30 and 40 dB in the OFF state and an insertion loss between 0.4 and 1.1 dB in the ON state, of which the waveguide-assembly setup alone contributes 0.3 dB. A device-level yield analysis was carried out, both by simulations and by creating artificial defects in the fabricated devices, revealing that a cantilever yield of 95% is sufficient for close-to-best performance. The actuation voltage of the active-opening/active-closing actuators is 40-44 V, depending on design, with high reproducibility of better than (sigma = 0.0605 V). Lifetime measurements of the all-metal, monocrystalline-silicon core devices were carried out for 14 h, after which 4.3 million cycles were achieved without any indication of degradation."
According to the news reporters, the research concluded: "Furthermore, a MEMS-switchable waveguide iris based on the reconfigurable surface is presented."
For more information on this research see: Parameter Analysis of Millimeter-Wave Waveguide Switch Based on a MEMS-Reconfigurable Surface. IEEE Transactions on Microwave Theory and Techniques, 2013;61(12):4396-4406. IEEE Transactions on Microwave Theory and Techniques can be contacted at: Ieee-Inst Electrical Electronics Engineers Inc, 445 Hoes Lane, Piscataway, NJ 08855-4141, USA. (Institute of Electrical and Electronics Engineers - www.ieee.org/; IEEE Transactions on Microwave Theory and Techniques - ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=22)
Our news correspondents report that additional information may be obtained by contacting Z. Baghchehsaraei, KTH Royal Inst Technol, Sch Elect Engn, Dept. of Micro & Nanosyst, S-10044 Stockholm, Sweden.
Keywords for this news article include: Sweden, Europe, Stockholm, Microwave Research
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