Antenna group at Chalmers Professor PerSimon Kildal Adjunct

Antenna group at Chalmers • Professor Per-Simon Kildal • Adjunct Professor Jan Carlsson • Ph. D students – – Tekn. Lic. Omid Sotoudeh… Dr in Dec 05 - Sony Ericsson Tekn. Lic. Malcolm Ng Mou Kehn…. Dr in Dec 05 Tekn. Lic. Ulf Carlberg Rikard Olsson…. . Lic in Oct 05 - AMC Centurion AB • External Ph. Ds – Dr. Kent Rosengren, Flextronics Comp. Kalmar…. Dr in May 05 – Kristian Karlsson, SP…. Lic in Sep 05 – Charlie Orlenius, Bluetest AB Workshop national graduate school for space technology, 2005 -09 -13

Workshop national graduate school for space technology, 2005 -09 -13

Research activities • Antenna design approaches – – Electromagnetic design methods (artificial surfaces/materials) Theory Numerical simulations, commercial tools Computation methods (moment method for special symmetries, Fortran & Matlab & Mathcad) – Characterization / new measurement methods for multipath • Antenna types – – Reflector antennas and feeds Small antennas Arrays Multifunction antennas Workshop national graduate school for space technology, 2005 -09 -13

What for? • • • Radio telescopes and ionospheric studies Satellite communication antennas Wireless terminals such as mobile phones Large companies such as Ericsson Small companies and spin-offs Workshop national graduate school for space technology, 2005 -09 -13

Example of our designs: EISCAT VHF antenna (200 m x 40 m) Workshop national graduate school for space technology, 2005 -09 -13

Example of our designs: Dual-reflector feed for radio telescope in Arecibo 300 m diameter Workshop national graduate school for space technology, 2005 -09 -13

Example of our designs: Odin dual reflector system Workshop national graduate school for space technology, 2005 -09 -13

Example of designs by us: Reflector antennas for radio links Workshop national graduate school for space technology, 2005 -09 -13

We are involved in US SKA proposal 100 MHz to 25 GHz, 5000 reflectors (Ø 43 m). Workshop national graduate school for space technology, 2005 -09 -13

Forerunner of US SKA (500 MHz – 10 GHz) Workshop national graduate school for space technology, 2005 -09 -13

Size and complexity for fmin = 500 MHz ATA feed: Problem with phase center variations Chalmers feed: No problem with phase center variations Workshop national graduate school for space technology, 2005 -09 -13

Size and complexity for fmin = 500 MHz ATA feed: Problem with phase center variations Eleven feed: No problem with phase center variations Workshop national graduate school for space technology, 2005 -09 -13

Eleven feed for Green Bank 43 m radio telescope: 150 -2000 MHz Workshop national graduate school for space technology, 2005 -09 -13

Our activity in Forskarskolan: “Hard” horn for multibeam satellite antenna Model made at Saab Ericsson Space 20 and 30 GHz in same antenna Workshop national graduate school for space technology, 2005 -09 -13