Department of Microelectronics
Faculty of Electrical Engineering, Mathematics, and Computer Science

dr. N. van Rooijen

PhD student
Terahertz Sensing (THZ), Department of Microelectronics

PhD thesis (Apr 2026): Spherical Fly’s-Eye Lens Antenna System for Wireless Communications & Sensing
Promotor: Nuria Llombart, Maria Alonso-delPino

Expertise: Analysis, design, and measurement of integrated lens antennas and leaky-wave structures

Biography

Nick van Rooijen received the M.Sc. degree (cum laude) in electrical engineering from the Delft University of Technology (TU Delft), Delft, The Netherlands, in 2021, where he is currently pursuing the Ph.D. degree with Terahertz Sensing Group.

At TU Delft, his research focuses on the development of a Fly’s eye lens array for high frequency communication applications. During the master’s, he worked on a first-time demonstration of a high frequency scanning-lens phased-array. His research interests include the analysis, design, and measurement of integrated lens antennas and leaky-wave structures. He was the co-recipient of the Best Theory And Design Antenna Paper Award and was also nominated for the Best Applied Technology Antenna Paper Award, both at the 16th European Conference on Antennas and Propagation in 2022.

Publications

  1. Flat Lens-in-Package Architecture Using Multi-Axis Machining in D-Band
    van Rooijen, N.; Alonso-delPino, M.; Bueno, J.; Llombart, N.;
    IEEE Open Journal of Antennas and Propagation,
    Volume 6, Issue 6, pp. 2032-2039, Dec. 2025. DOI: 10.1109/OJAP.2025.3613605

  2. A Core-Shell Lens for Antenna On-Package Integration at D-Band
    Rooijen, Nick van; Alonso-delPino, Maria; Bueno, Juan; Bechrakis Triantafyllos, Alexandros; Sberna, Paolo M.; Spirito, Marco; Llombart, Nuria;
    IEEE Trans. Antennas Propag.,
    Volume 72, Issue 8, pp. 6195-6208, 2024. DOI: https://doi.org/10.1109/TAP.2024.3417628

  3. A Core-Shell Lens for Antenna On-Package Integration at D-Band
    Rooijen, Nick van; Alonso-delPino, Maria; Bueno, Juan; Bechrakis Triantafyllos, Alexandros; Sberna, Paolo M.; Spirito, Marco; Llombart, Nuria;
    IEEE Transactions on Antennas and Propagation,
    Volume 72, Issue 8, pp. 6195-6208, 2024. DOI: 10.1109/TAP.2024.3417628
    Keywords: ... Lenses;Antennas;Antenna feeds;Permittivity;Geometry;Bandwidth;Antenna arrays;D-band;dual-lens antenna;lens antenna;millimeter-wave antenna;on-package antenna.

  4. Experimental Characterization of a Core-Shell Lens for Antenna On-Package Integration at D-Band
    N. van Rooijen; M. Alonso-delPino; J. Bueno; M. Spirito; N. Llombart;
    In 18th European Conference on Antennas and Propagation,
    Glasgow, UK, Mar. 17-22 2024.

  5. A 2-Tier TRL Calibration Technique to Assess Flip-Chip Interconnects at D-Band
    van Rooijen, N.; Bokhorst, R.; Dorrestein, S.; Chiappini, F.; Sberna, P.; Llombart, N.; Spirito, M.; Alonso-delPino, M;
    In 2024 103rd ARFTG Microwave Measurement Conference (ARFTG),
    Washington, DC, USA, Jun. 21 2024.

  6. A Near-Field Quasi-Optical Measurement Technique for Probe-Fed High-Gain Backside-Radiating Antennas
    Van Rooijen, Nick; Spirito, M.; Triantafyllos, A. Bechrakis; Llombart, N.; Alonso-delPino, M.;
    In 2024 IEEE/MTT-S International Microwave Symposium - IMS 2024,
    pp. 904-907, 2024. DOI: 10.1109/IMS40175.2024.10600366
    Keywords: ... Antenna measurements;Microwave measurement;Microwave antennas;Accuracy;Reflector antennas;Microwave theory and techniques;Calibration;Near-field measurement technique;Probe-fed antenna;backside radiating antenna;antenna in-package characterization;sub-THz frequency characterization;D-band.

  7. A Near-Field Quasi-Optical Measurement Technique for Probe-Fed High-Gain Backside-Radiating Antennas
    Van Rooijen, Nick; Spirito, M.; Bechrakis Triantafyllos, A.; Llombart, N.; Alonso-delPino, M.;
    In IEEE/MTT-S International Microwave Symposium - IMS,
    Washington, DC, USA, pp. 904-907, Jun. 16-21 2024. DOI: 10.1109/IMS40175.2024.10600366

  8. Electrically Small High Permittivity Lens Antenna Using Artificially Loaded Thermoplastics at 170 GHz
    N. van Rooijen; M. Alonso-delPino; J. Bueno; M. Spirito; N. Llombart;
    In 2023 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz),
    Montreal, QC, Canada, 2023. DOI: 10.1109/IRMMW-THz57677.2023.10299096

  9. On the Development of Scanning Lens Phased Arrays at 100 GHz
    M. Alonso-delPino; S. Bosma; N. van Rooijen; M. Spirito; Nuria Llombart;
    In Proc. IEEE International Symposium on Antennas and Propagation,
    Portland, OR, USA, 23-28 Jul. 2023.

  10. Electrically Small High Permittivity Lens Antenna Using Artificially Loaded Thermoplastics at 170 GHz
    Rooijen, Nick van; Alonso-delPino, Maria; Bueno, Juan; Spirito, Marco; Llombart, Nuria;
    In 2023 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz),
    pp. 1-2, 2023. DOI: 10.1109/IRMMW-THz57677.2023.10299096
    Keywords: ... Antenna measurements;Drilling;Slot antennas;Permittivity measurement;Prototypes;Plastics;Permittivity.

  11. First Demonstration of Dynamic High-Gain Beam Steering With a Scanning Lens Phased Array
    Bosma, Sjoerd; Van Rooijen, Nick; Alonso-Delpino, Maria; Spirito, Marco; Llombart, Nuria;
    IEEE Journal of Microwaves,
    Volume 2, Issue 3, pp. 419-428, Jul. 2022. DOI: 10.1109/JMW.2022.3179953

  12. A wideband leaky-wave lens antenna with annular corrugations in the ground plane
    Bosma, Sjoerd; Van Rooijen, Nick; Alonso-delPino, Maria; Llombart, Nuria;
    IEEE Antennas and Wireless Propagation Letters,
    Volume 21, Issue 8, pp. 1649-1653, May 2022. DOI: 10.1109/LAWP.2022.3176884

  13. First Demonstration of Dynamic High-Gain Beam Steering With a Scanning Lens Phased Array
    Bosma, Sjoerd; Van Rooijen, Nick; Alonso-Delpino, Maria; Spirito, Marco; Llombart, Nuria;
    IEEE Journal of Microwaves,
    Volume 2, Issue 3, pp. 419-428, 2022. DOI: 10.1109/JMW.2022.3179953
    Keywords: ... Lenses;Phased arrays;Arrayed waveguide gratings;Gratings;Antenna radiation patterns;Phase measurement;Beam steering;Beam steering;lens antennas;millimeter waves;phase shifting;phased arrays.

  14. W-Band Demonstration of Dynamic, High-Gain Beam Steering with a Scanning Lens Phased Array
    Bosma, Sjoerd; van Rooijen, Nick; Alonso-delPino, Maria; Spirito, Marco; Llombart, Nuria;
    In 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz),
    Delft, Netherlands, IEEE, pp. 1-2, 28 Aug. - 2 Sep. 2022. DOI: 10.1109/IRMMW-THz50927.2022.9895677

  15. Core-Shell Leaky-Wave Lens Antenna for 150GHz Fly’s Eye Communication Systems
    Nick van Rooijen; Maria Alonso-delPino; Marco Spirito; Nuria Llombart;
    In 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz),
    Delft, Netherlands, IEEE, pp. 1-2, 28 Aug. - 2 Sep. 2022. (Invited Keynote). DOI: 10.1109/IRMMW-THz50927.2022.9895815

  16. Core-Shell Leaky-Wave Lens Antenna for 150GHz Fly's Eye Communication Systems
    N. van Rooijen; M. Alonso-delPino; M. Spirito; N. Llombart;
    In 16th European Conference on Antennas and Propagation (EuCAP),
    Madrid, Spain, Mar. 27 - Apr. 1 2022. (Award for Best Antenna Theory & Design).

  17. On the Demonstration of Dynamic Beam-Steering with a Scanning Lens Phased Array at W-Band
    S. Bosma; N. van Rooijen; M. Alonso-delPino; M. Spirito; N. Llombart;
    In 16th European Conference on Antennas and Propagation (EuCAP),
    Madrid, Spain, Mar. 27 - Apr. 1 2022. (Nominated for Best Applied Technology Antenna Paper Award).

  18. W-Band Demonstration of Dynamic, High-Gain Beam Steering with a Scanning Lens Phased Array
    Bosma, Sjoerd; Rooijen, Nick van; Alonso-delPino, Maria; Spirito, Marco; Llombart, Nuria;
    In 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz),
    pp. 1-2, 2022. DOI: 10.1109/IRMMW-THz50927.2022.9895677
    Keywords: ... Phased arrays;Antenna measurements;Beam steering;Phase measurement;Prototypes;Gain measurement;Antenna feeds.

  19. Core-Shell Leaky-Wave Lens Antenna for 150GHz Fly’s Eye Communication Systems
    Rooijen, Nick van; delPino, Maria Alonso; Spirito, Marco; Llombart, Nuria;
    In 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz),
    pp. 1-2, 2022. DOI: 10.1109/IRMMW-THz50927.2022.9895815
    Keywords: ... Communication systems;Dielectric materials;Bandwidth;Aperture antennas;Dielectrics;Microstrip;Lenses.

  20. High Aperture Efficiency Plastic Lens Antenna for Scanning Lens Phased Array at 180 GHz
    Sjoerd Bosma; Nick van Rooijen; Maria Alonso-delPino; Nuria Llombart;
    In 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz),
    Chengdu, China, IEEE, pp. 1-2, 29 Aug. 3 Sep. 2021. DOI: 10.1109/IRMMW-THz50926.2021.9567550

  21. A Wideband Corrugated Leaky-Wave Feed with Low Cross-Pol for High Efficiency Lens Illumination
    Maria Alonso-delPino; Nick van Rooijen; Sjoerd Bosma; Nuria Llombart;
    In 15th European Conference on Antennas and Propagation (EuCAP),
    Düsseldorf, Germany, Mar. 22-26 2021.

BibTeX support

Last updated: 11 May 2026

Nick van Rooijen

Alumnus
  • Left in 2026