Studies on microelectromechanically tuneable high-impedance surface for millimetre wave beam steering

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Räisänen, Antti V. Chicherin, Dmitri 2012-09-04T09:47:07Z 2012-09-04T09:47:07Z 2011
dc.identifier.isbn 978-952-60-4390-6 (PDF)
dc.identifier.isbn 978-952-60-4389-0 (printed)
dc.identifier.issn 1799-4942
dc.description.abstract This thesis focuses on the development of novel microelectromechanically tuneable high-impedance surfaces (HIS) for millimetre wave beam steering applications. Microelectromechanical systems (MEMS) provide good functional parameters, e.g., low loss even at millimetre wave frequencies and excellent reliability, and can effectively compete with conventional technologies, e.g., ferroelectrics and ferrites. At the same time MEMS enable tuneability of the HIS, which can be used for developing reconfigurable devices with decreased system complexity, high level of integration and even as a system-on-a-chip, which dramatically reduces cost of the high frequency devices. The proposed MEMS tuneable HIS consists of a two-dimensional periodical arrangement of MEMS varactors, with a period much smaller than the wavelength of the interacting electromagnetic field, placed on an electrically thin grounded dielectric substrate. Being embedded in a waveguide, the structure can be used as an analogue type phase shifting element controlled by a bias voltage connected to the MEMS varactors. Alternatively, the MEMS tuneable HIS can be used as a smart electronic beam steering reflective surface, if a reconfigurable gradient of the effective surface impedance is induced throughout the structure by applying different programmed bias voltages to the different rows of the MEMS varactors. The methodology used in this study is a combination of analytical analysis, numerical simulations and electromagnetic measurements. A precise analytical model of the MEMS tuneable HIS is derived and used for designing of the structures operating in the W-band. Numerical simulations of different types of HIS and phase shifters based on the tuneable impedance surface embedded in rectangular metal waveguides and dielectric rod waveguides are carried out. Results of the numerical simulations correspond very well with the analytical calculations. Several prototypes of the multi-layered and MEMS-based HIS are fabricated and characterised. Measurements of the reflection coefficient show clear resonant high-impedance behaviour in the designed frequency range with reflection phase changing from almost 180° at lower frequencies to 0° at the resonance and to almost 180° at higher frequencies. The measured phase shifter based on a MEMS tuneable HIS placed adjacent to a dielectric rod waveguide exhibits an analogue type phase shift of up to 70° when the bias voltage is applied to the MEMS varactors. en
dc.format.extent Verkkokirja (4524 KB, 102 s.)
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Aalto University en
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS , 127/2011 en
dc.relation.haspart [Publication 1]: D. Chicherin, S. Dudorov, D. Lioubtchenko, V. Ovchinnikov, S. Tretyakov, and A.V. Räisänen, MEMS-based high-impedance surfaces for millimeter and submillimeter wave applications, Microwave and Optical Technology Letters, vol. 48, no. 12, pp. 2570-2573, 2006. en
dc.relation.haspart [Publication 2]: D. Chicherin, S. Dudorov, D. Lioubtchenko, V. Ovchinnikov, and A.V. Räisänen, Millimetre wave phase shifters based on a metal waveguide with a MEMS-based high-impedance surface, Proc. of the 36th European Microwave Conf., Manchester, UK, September 10-15, 2006, pp. 372-375. en
dc.relation.haspart [Publication 3]: D. Chicherin, S. Dudorov, D. Lioubtchenko, V. Ovchinnikov, and A.V. Räisänen, Characterisation and measurements of a multilayer high-impedance surface at W-band, Proc. of the 1st International Congress on Advanced Electromagnetic Materials in Microwave and Optics, Rome, Italy, October 22-26, 2007, pp. 891-894. en
dc.relation.haspart [Publication 4]: D. Chicherin, S. Dudorov, M. Sterner, J. Oberhammer, and A.V. Räisänen, Micro-fabricated high-impedance surface for millimeter wave beam steering applications, Proc. of the 33rd International Conf. on Infrared, Millimeter, and Terahertz Waves, Pasadena, California, USA, September 15-19, 2008, PID659522.pdf, Keynote presentation. en
dc.relation.haspart [Publication 5]: M. Sterner, D. Chicherin, A.V. Räisänen, G. Stemme, and J. Oberhammer, RF MEMS high-impedance tuneable metamaterials for millimeter-wave beam steering, Proc. of the IEEE MEMS Conf., Sorrento, Italy, January 25-29, 2009, pp. 896-899. en
dc.relation.haspart [Publication 6]: D. Chicherin, M. Sterner, J. Oberhammer, S. Dudorov, J. Åberg, and A.V. Räisänen, Analog type millimeter wave phase shifters based on MEMS tunable high-impedance surface in rectangular metal waveguide, IEEE International Microwave Symp. Digest, Anaheim, CA, USA, May 25-28, 2010, pp. 61-64. en
dc.relation.haspart [Publication 7]: M. Sterner, D. Chicherin, J. Åberg, R. Sauleau, A.V. Räisänen, G. Stemme, and J. Oberhammer, Integration of microwave MEMS reconfigurable reflective surfaces in rectangular waveguide stubs, Proc. of Asia Pacific Microwave Conf., Yokohama, Japan, December 7-10, 2010, pp. 1825-1828. en
dc.relation.haspart [Publication 8]: D. Chicherin, M. Sterner, J. Oberhammer, S. Dudorov, D. Lioubtchenko, A.J. Niskanen, V. Ovchinnikov, and A.V. Räisänen, MEMS based high-impedance surface for millimetre wave dielectric rod waveguide phase shifter, Proc. of the 40th European Microwave Conf., Paris, France, September 28-30, 2010, pp. 950-953. en
dc.relation.haspart [Publication 9]: D. Chicherin, M. Sterner, D. Lioubtchenko, J. Oberhammer, and A.V. Räisänen, Analog-type millimeter-wave phase shifters based on MEMS tunable high-impedance surface and dielectric rod waveguide, International Journal of Microwave and Wireless Technologies, vol. 3, no. 5, pp. 533-538, 2011. en
dc.relation.haspart [Publication 10]: Z. Du, D. Chicherin, and A.V. Räisänen, Millimeter wave beam steering with a MEMS-based high impedance surface, Proc. of European Microwave Conf., Manchester, UK, October 9-14, 2011, pp. 1043-1046. en
dc.subject.other Electrical engineering
dc.title Studies on microelectromechanically tuneable high-impedance surface for millimetre wave beam steering en
dc.type G5 Artikkeliväitöskirja fi Sähkötekniikan korkeakoulu fi
dc.contributor.department Radiotieteen ja -tekniikan laitos fi
dc.contributor.department Department of Radio Science and Engineering en
dc.subject.keyword high-impedance surface en
dc.subject.keyword artificial electromagnetic materials en
dc.subject.keyword microelectromechanical systems en
dc.subject.keyword MEMS en
dc.subject.keyword beam steering en
dc.subject.keyword phase shifters en
dc.subject.keyword millimetre wave en
dc.identifier.urn URN:ISBN:978-952-60-4390-6
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en
dc.contributor.supervisor Räisänen, Antti V.

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