Antenna-Ross-Murch - 1 MIMO Systems and Practical Antenna...

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Unformatted text preview: 1 MIMO Systems and Practical Antenna Considerations Ross Murch Ross Murch Professor, Electronic and Computer Engineering Professor, Electronic and Computer Engineering Director, Centre for Wireless Information Technology Director, Centre for Wireless Information Technology The Hong Kong University The Hong Kong University of Science and Technology of Science and Technology 2 Outline Outline • Motivation • Limits on the numbers of multiple antennas Review Approaches Prototypes • Effects of Mutual coupling Effects Limits Prototypes • MIMO Systems application Optimizing radiated and available power constraints • Summary 3 Hong Kong, China Hong Kong, China Hong Kong University of Hong Kong University of Science and Technology Science and Technology (HKUST) (HKUST) 4 Motivation Motivation 5 Wireless Everywhere Wireless Everywhere Future 2018 Future 2018 Trillions Trillions of Wireless devices of Wireless devices Various Various Info/Media Info/Media New Mobile New Mobile Devices Devices Distributed Distributed Environmental Environmental & Bio Sensing & Bio Sensing Smart RFID Smart RFID People to People People to machines Machines to Machines Next Next generation generation phones phones Medical Medical applications applications Security Security 6 Everyone uses a mobile Phone including Vijay! 7 • What can we do? Increasing Capacity Increasing Capacity ) / 1 ( log 2 N P B C i i Channels + = ∑ Increase Bandwidth Cognitive Radio More Channels MIMO Increase Power Cooperative systems Compact Multi-standard Multi- Compact Multi-standard Multi- Antenna Antenna Design Design Operation in multiple bands and multiple antennas • Need for compact Need for compact antennas covering many antennas covering many frequency bands frequency bands • Need for multiple Need for multiple antennas in MIMO antennas in MIMO systems systems Challenge Challenge s s for Compact Multi-standard for Compact Multi-standard Multi- Multi- Antenna Design Antenna Design • Electronic and RF circuits/ Electronic and RF circuits/ Multi-standard RF Multi-standard RF transceivers transceivers Recent technologies enable electronic and RF circuits to be miniaturized and become physically smaller in size Moore’s Law (i.e. Smallest Feature of IC is um 90nm • Antenna Design Antenna Design The size of an antenna is not technology related, but set by laws of physics. The physical size of antenna is proportional to the bandwidth and the number of operating bands. Multiple antenna placement is restricted by mutual coupling and correlation No Moore’s law for antennas! a Chu-Wheeler Theorem Upper bound of antenna’s bandwidth for a certain volum of antenna 1.6cm radius has sphere the 3GHz at 7 has sphere when % 100 λ = BW 3 ) ( 1 ka Q LB = 3 3 3 / ) 2 ( ) ( c fa ka BW π = = 10 Limits on the number of Limits on the number of multiple antennas multiple antennas 11 Limits on the number of Limits on the number of multiple antennas...
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This note was uploaded on 05/19/2010 for the course ELECTRICAL ECSE 493 taught by Professor Tholengoc during the Spring '10 term at McGill.

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Antenna-Ross-Murch - 1 MIMO Systems and Practical Antenna...

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