Reconfigurable Antennas and Antenna Arrays: Architectures and Technologies Sean Victor Hum Asst. Professor, University of Toronto, Canada [email protected] Presented to: Universidad Politécnica de Madrid 21 April 2010 About Myself • Alumnus of the University of Calgary, Canada • Worked with TRLabs, a large non-‐profit telecommunicaNons research consorNum in Western Canada, 1997-‐2006 • Joined the U of T Dept. of ECE in September 2006 • Research interests: – Reconfigurable antennas and RF systems – Reflectarrays and other space-‐fed antennas – Ultra-‐wideband communicaNons – Applied electromagneNcs in space technology 21 April 2010 Universidad Politécnica de Madrid 2 About Canada 21 April 2010 Universidad Politécnica de Madrid 3 About the University of Toronto • ECE dept: 80 faculty, 1000 undergraduate students, 450 graduate students • EM group: 4 professors, 30 graduate students • UofT is Canada’s largest school (3 campuses, 85,000 students+staff) 21 April 2010 Universidad Politécnica de Madrid 4 EM Group: Our FaciliNes • 20’ far-‐field antenna range • 120 GHz wafer/board tesNng capabiliNes • 20’ EMC chamber • Class 100-‐10,000 cleanrooms • 1.2m planar near field scanner • Spacecrad charging simulators • Semi-‐anechoic mm-‐wave range • 96-‐processor cluster, hardware • Rapid prototyping faciliNes accelerators 21 April 2010 Universidad Politécnica de Madrid 5 Agenda • MoNvaNon and definiNons • Frequency-‐agile antennas • Pafern-‐reconfigurable high-‐gain antennas – Reconfigurable reflectors • Passive • AcNve – Reconfigurable lenses • UWB beamforming arrays • Conclusions 21 April 2010 Universidad Politécnica de Madrid 6 Research MoNvaNon • TradiNonally, antennas are passive transducers • Next-‐generaNon communicaNon systems will rely upon/benefit from adapNve antennas – Wireless systems in dynamic scenarios (e.g. satellite / terminal tracking) – AdapNve beam scanning (RADAR / remote sensing) – MIMO systems: acNve management of channel correlaNon / diversity / interference – CogniNve / sodware-‐defined radio • Can we make more intelligent antenna designs to fulfill the needs of these systems? 21 April 2010 Universidad Politécnica de Madrid 7 Reconfigurable Antennas… ... have the ability to have their electrical and/or radiaNon characterisNcs adapNvely manipulated in real Nme – RadiaNon pafern • Beam direcNon • Beam shape / sidelobe level / mulNple beams – PolarizaNon – OperaNng frequency / band (input impedance) – etc. 21 April 2010 Universidad Politécnica de Madrid 8 Enabling Technologies • Electronically tuned reactances – Varactor diodes, MEMS-‐ tunable capacitors / inductors • RF switches – PIN diode / FET switches, MEMS • ExoNc materials – NemaNc liquid crystals, S. V. Hum, G. McFeetors, and M. Okoniewski, nonlinear materials, “Integrated MEMS reflectarray elements,” in Proc. EuCAP 2006. ESA SP-‐626, Nov. 2006. ferroelectric films 21 April 2010 Universidad Politécnica de Madrid 9 21 April 2010 Universidad Politécnica de Madrid 10
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