Dr.-Ing. Jan Schöp­fel

S. Hauptmeier, J. Romstadt, J. Schöpfel, A. Zaben, K. Aufinger, and N. Pohl, “A SiGe D-Band Frequency Tripler Utilizing a Single-Sideband Mixer,” in 2025 International Conference on Mobile and Miniaturized Terahertz Systems (ICMMTS), Dubai , Mar. 2025, doi: 10.1109/icmmts62835.2025.10926024.

D. Starke et al., “A 360 GHz fully integrated differential signal source with 106.7 GHz continuous tuning range in 90 nm SiGe:C BiCMOS,” IEEE transactions on microwave theory and techniques, vol. 2024, Feb. 2024, doi: 10.1109/tmtt.2024.3356610.

T. T. Braun, J. Schöpfel, A. J. Marquez Maldera, and N. Pohl, “Overcoming the relative bandwidth limitations of single VCO frequency synthesizers by implementing a novel PLL architecture,” International journal of microwave and wireless technologies, vol. 2024, Feb. 2024, doi: 10.1017/s1759078723001484.

J. Bott et al., “A 335–407-GHz SiGe-Based Subharmonic Mixer Using a Fully Integrated LO Generation,” IEEE microwave and wireless components letters, vol. 34, no. 6, pp. 675–678, Apr. 2024, doi: 10.1109/lmwt.2024.3389061.

J. Schöpfel, N. Pohl, and T. Zwick, “Systemkonzepte und integrierte Schaltungen für Radarsensoren für das vollautomatisierte Fahren,” Universitätsbibliothek, Ruhr-Universität Bochum, Bochum, 2024.

T. T. Braun, J. Schöpfel, C. Bredendiek, J. J. Forero, and N. Pohl, “Introducing Inharmonic Radar: Tag Detection in the Automotive Bands of Present and Future at 76–81/134–141 GHz via Fractional Multiplication,” IEEE journal of microwaves, vol. 4, no. 3, pp. 473–485, Jul. 2024, doi: 10.1109/jmw.2024.3412415.

T. T. Braun, J. Schöpfel, C. Bredendiek, and N. Pohl, “Connecting the Automotive Bands of Present and Future With a Tag for Inharmonic Radar at 76–81/134–141 GHz,” IEEE microwave and wireless components letters, vol. 34, no. 4, pp. 451–454, Feb. 2024, doi: 10.1109/lmwt.2024.3362385.

L. Sigg et al., “Over-the-Air Synchronization for Coherent Digital Automotive Radar Networks,” IEEE Transactions on Radar Systems , vol. 2, pp. 739–751, Aug. 2024, doi: 10.1109/trs.2024.3449333.

J. Schöpfel, T. T. Braun, J. Hellwig, H. Rücker, and N. Pohl, “A 79 GHz SiGe Doherty Power Amplifier Suitable for Next-Generation Automotive Radar,” IEEE journal of microwaves, vol. 4, no. 4, pp. 721–732, Jul. 2024, doi: 10.1109/jmw.2024.3419430.

J. Schöpfel, T. T. Braun, and N. Pohl, “Proposing a Subharmonic Downconverting IQ-Mixer for mm-Wave 6G and Other D-Band Applications,” in 2024 19th European Microwave Integrated Circuits Conference (EuMIC), Paris, Oct. 2024, doi: 10.23919/eumic61603.2024.10732460.

T. T. Braun, J. Schöpfel, K. Aufinger, and N. Pohl, “Optimum Biasing of SiGe-HBTs to Maximize the Gain Per Current for Power Efficient Amplification,” in 2024 19th European Microwave Integrated Circuits Conference (EuMIC), Paris, Oct. 2024, doi: 10.23919/eumic61603.2024.10732512.

T. T. Braun et al., “A phase-locked loop with a jitter of 50 fs for astronomy applications,” International journal of microwave and wireless technologies, vol. 15, no. 6, pp. 1012–1020, Jan. 2023, doi: 10.1017/s1759078722001386.

J. Schöpfel, H. Rücker, and N. Pohl, “A differential SiGe HBT doherty power amplifier for automotive radar at 79 GHz,” in 2023 IEEE 23rd Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems, Las Vegas, Feb. 2023, pp. 44–46, doi: 10.1109/sirf56960.2023.10046275.

T. T. Braun, J. Schöpfel, and N. Pohl, “Detecting vulnerable road users utilizing the harmonic RCS of active tags at 79/158 GHz,” in 2023 IEEE Radar Conference (RadarConf23), San Antonio, Jun. 2023, doi: 10.1109/radarconf2351548.2023.10149776.

O. Krylova, J. Schöpfel, K. Aufinger, and N. Pohl, “A high linearity SiGe D-band diode ring mixer,” in 2023 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS 2023), Monterey, Calif., 2023, pp. 98–101, doi: 10.1109/bcicts54660.2023.10310845.

T. T. Braun, M. van Delden, C. Bredendiek, J. Schöpfel, and N. Pohl, “A low phase noise phase-locked loop with short settling times for automotive radar,” in 16th European Microwave Integrated Circuits Conference (EuMIC), London, Jun. 2022, pp. 205–208, doi: 10.23919/eumic50153.2022.9783662.

J. Schöpfel, S. Grueter, J. Wagner, and N. Pohl, “A squint compensated fully differential patch antenna for automotive MIMO applications,” in 2021 51st European Microwave Conference, London, Jun. 2022, pp. 163–166, doi: 10.23919/eumc50147.2022.9784231.

T. T. Braun, J. Schöpfel, C. Schweer, and N. Pohl, “A harmonic automotive radar for bicycle detection with RFID Tags at 79/158 GHz,” in 2022 IEEE/MTT-S International Microwave Symposium (IMS 2022), Aug. 2022, doi: 10.1109/ims37962.2022.9865601.

T. T. Braun, J. Schöpfel, A. J. Marquez M, and N. Pohl, “Achieving a relative bandwidth of 176% with a single PLL at up to 12.5 GHz,” in 2022 52nd European Microwave Conference (EuMC), Mailand, Nov. 2022, doi: 10.23919/eumc54642.2022.9924377.

J. Schöpfel, T. T. Braun, S. Kueppers, K. Aufinger, and N. Pohl, “A fully differential hybrid coupler for automotive radar applications,” in 17th European Microwave Integrated Circuits Conference (EuMIC), Mailand, Nov. 2022, pp. 107–110, doi: 10.23919/eumic54520.2022.9923546.

T. T. Braun, J. Schöpfel, P. Kwiatkowski, C. Schweer, K. Aufinger, and N. Pohl, “Expanding the capabilities of automotive radar for bicycle detection with harmonic RFID tags at 79/158 GHz,” IEEE transactions on microwave theory and techniques, vol. 71, no. 1, pp. 320–329, Nov. 2022, doi: 10.1109/tmtt.2022.3219541.

B. Nuss, A. Diewald, J. Schöpfel, D. Martini, N. Pohl, and T. Zwick, “76GHz OFDM radar demonstrator with real-time processing for automotive applications,” in 2020 IEEE MTT-S International Conference on Microwaves for Intelligent Mobility (ICMIM 2020), Online, 2020, pp. 5–8, doi: 10.1109/icmim48759.2020.9299057.

J. Schöpfel, S. Küppers, K. Aufinger, and N. Pohl, “A SiGe transceiver chipset for automotive radar applications using wideband modulation sequences,” International journal of microwave and wireless technologies, vol. 11, no. 7, pp. 676–685, May 2019, doi: 10.1017/s1759078719000849.

J. Schöpfel, S. Küppers, K. Aufinger, and N. Pohl, “Ein modularer Radar-Chipsatz für 77 GHz MIMO Anwendungen,” in MikroSystemTechnik Kongress 2019, Berlin, 2019, pp. 291–292.

C. Bredendiek et al., “A 61-GHz SiGe transceiver frontend for energy and data transmission of passive RFID single-chip tags with integrated antennas,” IEEE journal of solid state circuits / Institute of Electrical and Electronics Engineers, vol. 53, no. 9, pp. 2441–2453, Sep. 2018, doi: 10.1109/jssc.2018.2843348.

J. Schöpfel, S. Küppers, K. Aufinger, and N. Pohl, “A multipurpose 76GHz radar transceiver system for automotive applications based on SiGe MMICs,” in 2018 13th European Microwave Integrated Circuits Conference (EuMIC 2018), Madrid, 2018, pp. 45–48, doi: 10.23919/eumic.2018.8539885.