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

Antenna group at Chalmers• Professor Per-Simon Kildal• Adjunct Professor Jan Carlsson• PhD 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 PhDs– 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 (200m x 40m)

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 (Ø43m).

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 43m 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