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, Published. doi: 10.1109/icmmts62835.2025.10926024.

S. Hauptmeier, J. Romstadt, K. Aufinger, and N. Pohl, ‘A Wideband SiGe D-Band Power Amplifier with 17.4 dBm Peak Output Power Featuring a Transformer-Based Load’, in 2025 16th German Microwave Conference (GeMiC), Dresden, May 2025, Published. doi: 10.23919/gemic64734.2025.10979084.

J. Romstadt et al., ‘Proving the Feasibility of D-Band Single SiGe MMIC Vector Network Analyzer Extension Modules with Large System Dynamic Range’, IEEE journal of microwaves, vol. 4, no. 4, pp. 706–720, Sep. 2024, doi: 10.1109/jmw.2024.3444040.

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. Romstadt et al., ‘A D-band vector network analyzer extension module based on a SiGe reflectometer MMIC’, in 2023 IEEE/MTT-S International Microwave Symposium (IMS 2023), San Diego, Jul. 2023, pp. 927–930. doi: 10.1109/ims37964.2023.10188062.