Roel Witvers

Function Instrument Engineer
Phone +31 (0)521 595 142
Email witvers at




- Low Noise Amplifiers
- MMIC design
- RF design  


- Improved sensitivity of a low noise aperture array tile for the SKA
EM Woestenburg, RH Witvers, M Ruiter, P Benthem
Electromagnetics in Advanced Applications (ICEAA), 2014 International ... 

- Mid frequency aperture array technology developments for the SKA
JG de Vaate, P Benthem, RH Witvers, R van den Brink, Y Zhang, ...
Antenna Technology and Applied Electromagnetics (ANTEM), 2014 16th ... 

- Cooling a low noise amplifier with a micromachined cryogenic cooler
HS Cao, RH Witvers, S Vanapalli, HJ Holland, HJM ter Brake
Review of Scientific Instruments 84 (10), 105102 

- Low noise amplifier for radio astronomy
DMP Smith, L Bakker, RH Witvers, EEM Woestenburg, KD Palmer
International Journal of Microwave and Wireless Technologies 5 (04), 453-461 

- Numerical Results for the System Noise Temperature of an Aperture Array Tile and Comparison with Measurements
MV Ivashina, EEM Woestenburg, L Bakker, RH Witvers
arXiv preprint arXiv:1110.2996 

- THACO: A test facility for characterizing the noise performance of active antenna arrays
EEM Woestenburg, L Bakker, M Ruiter, MV Ivashina, RH Witvers
Radar Conference (EuRAD), 2011 European, 389-392 

- Low noise room temperature LNAs for the SKA
EEM Woestenburg, RH Witvers, L Bakker
Microwave Integrated Circuits Conference (EuMIC), 2011 European, 366-369 

- Front-End Integration Requirements for the Square Kilometre Array Radio Telescope
JG Bij de Vaate, RH Witvers, EEM Woestenburg
Compound Semiconductor Integrated Circuit Symposium (CSICS), 2010 IEEE, 1-3 

- Sub 0.15 dB noise figure room temperature GaAs LNA for next generation radio telescope
RH Witvers, JG Bij de Vaate, EEM Woestenburg
Microwave Conference (EuMC), 2010 European, 1078-1081 

- Low cost low noise phased-array feeding systems for SKA pathfinders
JGB De Vaate, L Bakker, EEM Woestenburg, RH Witvers, GW Kant, ...
Antenna Technology and Applied Electromagnetics and the Canadian Radio ... 

- Noise characterization of ultra low noise differential amplifiers for next generation radiotelescopes
J Morawietz, RH Witvers, JGB de Vaate, EEM Woestenburg
Radar Conference, 2007. EuRAD 2007. European, 291-294 

- Achieving wideband sub-1dB noise figure and high gain with MOSFETs if input power matching is not required
EAM Klumperink, Q Zhang, GJM Wienk, RH Witvers, JG Bij de Vaate, ...
Radio Frequency Integrated Circuits (RFIC) Symposium, 2007 IEEE, 673-676 

- State of the art MMIC InP LNA realizations and applications in FARADAY array receivers
A Cremonini, S Mariotti, V Natale, R Nesti, A Orfei, G Tofani, D Kettle, ...
Electrotechnical Conference, 2006. MELECON 2006. IEEE Mediterranean, 561-564 

- MMIC GaAs and InP Very Low Noise Amplifier Designs for the Next Generation Radio Telescopes
RH Witvers, JG Bij de Vaate, A Sarmasanu

- DC to 11GHz Fully Integrated GaAs Up Conversion Mixer
RH Witvers, JG de Vaate
Microwave Conference, 2001. 31st European, 1-4 

- Integrated active antenna noise figure characterization using a cryogenic anechoic noise source
JG de Vaate, D Geskus, RH Witvers
Microwave Conference, 2001. 31st European, 1-4 

- Decade wide bandwidth integrated very low noise amplifier
JG de Vaate, EEM Woestenburg, RH Witvers, R Pantaleoni
Microwave Conference, 2000. 30th European, 1-4 

- Design and characterisation of a low noise active antenna (LNAA) for SKA
EEM Woestenburg, RH Witvers
Perspectives on Radio Astronomy: Technologies for Large Antenna Arrays 1, 183 


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