2025

• Systematic Investigation of Heart Sound Propagation using Continuous Wave Radar
  Oesten, Marie; Abel, Luca; Albrecht, Nils Christian; Richer, Robert; Langer, Dominik; Grießhammer, Stefan; Ghanem, Khalida; Steigleder, Tobias; Ostgathe, Christoph; Kölpin, Alexander; Eskofier, Björn
  IEEE Journal of Biomedical and Health Informatics (in Press): (2025)
  Publisher DOI

2024

• A fully integrated radar-based true-speed-over-ground sensor for highly dynamic road vehicles
  Albrecht, Nils Christian; Langer, Dominik; Kölpin, Alexander
  IEEE/MTT-S International Microwave Symposium, IMS 2024
  Publisher DOI
• EmRad: ubiquitous vital sign sensing using compact continuous-wave radars
  Albrecht, Nils Christian; Langer, Dominik; Krauss, Daniel; Richer, Robert; Abel, Luca; Eskofier, Bjoern M.; Rohleder, Nicolas; Kölpin, Alexander
  IEEE Open Journal of Engineering in Medicine and Biology 5: 725-734 (2024)
  Open Access | Publisher DOI
• Contactless radar-based heart rate estimation in palliative care – a feasibility study and possible use in symptom management
  Grießhammer, Stefan; Malessa, Anke; Lu, Hui; Yip, Julia Beatriz; Leuschner, Julie; Christgau, Florian; Albrecht, Nils Christian; Oesten, Marie; Tran, Thanh Truc; Richer, Robert; Heckel, Maria; Eskofier, Björn; Kölpin, Alexander; Steigleder, Tobias; Ostgathe, Christoph
  BMC Palliative Care 23 (1): 273 (2024)
  Open Access | Publisher DOI
• A review and tutorial on machine learning-enabled radar-based biomedical monitoring
  Krauss, Daniel; Engel, Lukas; Ott, Tabea; Braeunig, Johanna; Richer, Robert; Gambietz, Markus; Albrecht, Nils Christian; Hille Eva Maria; Ullmann, Ingrid; Braun, Matthias; Dabrock, Peter; Kölpin, Alexander; Koelewijn, Anne; Eskofier, Björn; Vossiek, Martin
  IEEE Open Journal of Engineering in Medicine and Biology 5: 680-699 (2024)
  Open Access | Publisher DOI
• Integration approach for radar transceiver MMICs with integrated antennas enabling adaptability to customized passive frontend design
  Langer, Dominik; Albrecht, Nils Christian; Bartels, Frederike; Tegowski, Bartosz; Kölpin, Alexander
  IEEE/MTT-S International Microwave Symposium, IMS 2024
  Publisher DOI
• Near-field scattering phenomena in monostatic radar applications derived from physical optics
  Tegowski, Bartosz; Langer, Dominik; Wenzel, Marvin; Albrecht, Nils Christian; Kölpin, Alexander
  IEEE Transactions on Antennas and Propagation 73 (2): 1084-1094 (2025)
  Publisher DOI

2023

• Characterization of the influence of clothing and other materials on human vital sign sensing using mmWave radar
  Albrecht, Nils Christian; Weiland, Jan Philipp; Langer, Dominik; Wenzel, Marvin; Kölpin, Alexander
  53rd European Microwave Conference (EuMC 2023)
  Publisher DOI
• Long-distance heart sound detection using 122 GHz CW radar with 3D printed high-gain antennas
  Albrecht, Nils Christian; Heyer, Markus; Wenzel, Marvin; Langer, Dominik; Lu, Hui; Kölpin, Alexander
  IEEE Radio and Wireless Symposium (RWS 2023)
  Publisher DOI
• The Design Process for Monolithically Manufactured Millimeter-Wave Antenna Arrays Using Stereolithography 3D Printing
  Langer, Dominik; Tegowski, Bartosz; Albrecht, Nils Christian; Wenzel, Marvin; Kölpin, Alexander
  IEEE/MTT-S International Microwave Symposium (IMS 2023)
  Publisher DOI
• Accurate heart beat detection with doppler radar using bidirectional GRU network
  Lu, Hui; Heyder, Markus; Wenzel, Marvin; Albrecht, Nils Christian; Langer, Dominik; Kölpin, Alexander
  IEEE Radio and Wireless Symposium (RWS 2023)
  Publisher DOI
• Palliative care and new technologies : the use of smart sensor technologies and its impact on the Total Care principle
  Ott, Tabea; Heckel, Maria; Öhl, Natalie; Steigleder, Tobias; Albrecht, Nils C.; Ostgathe, Christoph; Dabrock, Peter
  BMC Palliative Care 22 (1): 50 (2023)
  Open Access | Publisher DOI
• Catch Your Breath! Vital Sign Sensing With Radar
  Wenzel, Marvin; Albrecht, Nils Christian; Langer, Dominik; Heyder, Markus; Kölpin, Alexander
  IEEE Microwave Magazine 24 (3): 75-82 (2023)
  Publisher DOI
• Heart Sound Detection Using an Ultra-Wideband FMCW Radar
  Wenzel, Marvin; Kölpin, Alexander; Tegowski, Bartosz; Albrecht, Nils Christian; Langer, Dominik
  IEEE/MTT-S International Microwave Symposium (IMS 2023)
  Publisher DOI

2022

• Influence of sensor position and body movements on radar-based heart rate monitoring
  Herzer, Liv; Mücke, Annika; Richer, Robert; Albrecht, Nils Christian; Heyder, Markus; Jäger, Katharina M.; König, Veronika; Kölpin, Alexander; Rohleder, Nicolas; Eskofier, Björn
  IEEE-EMBS International Conference on Biomedical and Health Informatics (BHI 2022)
  Publisher DOI
• A Heterodyne Transceiver With Integrated Calibrator for K/Ka-Band Phased Arrays
  Sieganschin, Anton; Albrecht, Nils Christian; Tegowski, Bartosz; Jaschke, Thomas; Waldhelm, Jan; Lamann, Nadja Janinka; Jacob, Arne
  51st European Microwave Conference, EuMC 2021 (2022)
  Publisher DOI

2021

• Amplifier Bias for Minimum Noise Figure in Thermally Constrained Systems
  Sieganschin, Anton; Albrecht, Nils Christian; Jaschke, Thomas; Jacob, Arne
  51st European Microwave Conference (EuMC 2021)
  Publisher DOI