@misc{KrauseMichlerKoelpinetal., author = {Krause, Sascha and Michler, Fabian and K{\"o}lpin, Alexander and Rudolph, Matthias and Heinrich, Wolfgang}, title = {A Digital Correction Method for Increased Dynamic Range in Interferometric Six-Port Radars}, series = {IEEE Microwave and Wireless Components Letters}, volume = {31}, journal = {IEEE Microwave and Wireless Components Letters}, number = {8}, issn = {1558-1764}, doi = {10.1109/LMWC.2021.3084338}, pages = {997 -- 1000}, language = {en} } @misc{ShresthaDoernerYacoubetal., author = {Shrestha, Amit and D{\"o}rner, Ralf and Yacoub, Hady and Johansen, Tom K. and Heinrich, Wolfgang and Krozer, Viktor and Rudolph, Matthias and Wentzel, Andreas}, title = {A 100 GHz Class-F-Like InP-DHBT PA with 25,4\%PAE}, series = {16th European Microwave Integrated Circuits Conference (EuMIC), 03-04 April 2022, London, United Kingdom}, journal = {16th European Microwave Integrated Circuits Conference (EuMIC), 03-04 April 2022, London, United Kingdom}, isbn = {978-2-87487-064-4}, doi = {10.23919/EuMIC50153.2022.9783638}, pages = {225 -- 228}, language = {en} } @misc{KrauseZervosBeleniotisetal., author = {Krause, Sascha and Zervos, Christos and Beleniotis, Petros and Ritter, Dan and Rudolph, Matthias and Heinrich, Wolfgang}, title = {On the Influence of Transistor Dimensions on the Dispersive Behavior in A1GaN/GaN HEMT-Based PAs and Robust LNAs}, series = {IEEE/MTT-S International Microwave Symposium - IMS 2022, 19-24 June 2022 Denver, CO, USA}, journal = {IEEE/MTT-S International Microwave Symposium - IMS 2022, 19-24 June 2022 Denver, CO, USA}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-1-6654-9613-1}, doi = {10.1109/IMS37962.2022.9865474}, pages = {914 -- 917}, language = {en} } @misc{YazdaniBeleniotisBrunneretal., author = {Yazdani, Hossein and Beleniotis, Petros and Brunner, Frank and Ostermay, Ina and W{\"u}rfl, Joachim and Rudolph, Matthias and Heinrich, Wolfgang and Hilt, Oliver}, title = {K/Ka-Band-GaN-High-Electron-Mobility Transistors Technology with 700 mS mm-1 Extrinsic Transconductance}, series = {Physica Status Solidi}, journal = {Physica Status Solidi}, doi = {10.1002/pssa.202400592}, pages = {8}, language = {en} } @misc{TiwariFlisgenHeinrichetal., author = {Tiwari, Krishan Kumar and Flisgen, Thomas and Heinrich, Wolfgang and Caire, Giuseppe}, title = {Array-fed RIS : validation of Friis-based modeling using full-wave simulations}, series = {Proceedings of the 2025 16th German Microwave Conference (GeMiC), March 17-19, 2025, Dresden, Germany}, journal = {Proceedings of the 2025 16th German Microwave Conference (GeMiC), March 17-19, 2025, Dresden, Germany}, publisher = {Institute of Electrical and Electronics Engineers (IEEE)}, address = {New York, NY}, isbn = {978-3-9820397-4-9}, doi = {10.23919/GeMiC64734.2025.10979163}, pages = {611 -- 614}, abstract = {Space-fed large antenna arrays offer superior efficiency, simplicity, and reductions in size, weight, power, and cost (SWaP-C) compared to constrained-feed systems. Historically, horn antennas have been used for space feeding, but they suffer from limitations such as bulky designs, low aperture efficiency (≈ 50\%), and restricted degrees of freedom at the continuous aperture. In contrast, planar patch arrays achieve significantly higher aperture efficiency (> 90\%) due to their more uniform aperture distribution, reduced weight, and increased degrees of freedom from the discretized aperture. Building on these advantages, we proposed an array-fed Reflective Intelligent Surface (RIS) system, where an active multi-antenna feeder (AMAF) optimizes power transfer by aligning with the principal eigenmode of the AMAF-RIS propagation matrix T. While our previous studies relied on the Friis transmission formula for system modeling, we now validate this approach through full-wave simulations in CST Microwave Studio®. By comparing the Friis-based matrix, TFriis, with the full-wave solution, Tfull.wave, we validate the relevance of the Friis-based modeling for top-level system design. Our findings confirm the feasibility of the proposed AMAF-RIS architecture for next generation communication systems.}, language = {en} } @misc{DischkeNozinicHellmichetal., author = {Dischke, Eugen and Nozinic, Sonja and Hellmich, Daniel Georg and Flisgen, Thomas and R{\"a}mer, Adam and Heinrich, Wolfgang and Krozer, Viktor}, title = {Band-pass filter based on stacked metal plates in V-band waveguide technology}, series = {Proceedings of the 2025 IEEE/MTT-S International Microwave Symposium (IMS), 15-20 June 2025, San Francisco, CA, USA}, journal = {Proceedings of the 2025 IEEE/MTT-S International Microwave Symposium (IMS), 15-20 June 2025, San Francisco, CA, USA}, publisher = {Institute of Electrical and Electronics Engineers (IEEE)}, address = {New York, NY}, isbn = {979-8-3315-1409-9}, issn = {2576-7216}, doi = {10.1109/IMS40360.2025.11103935}, pages = {427 -- 430}, abstract = {Waveguide filters ideally require resonance chambers, whose shape is defined by sharp corners. As this is difficult to obtain by classical means of production, a cost-effective rectangular band-pass filter (BPF) based on multilayer waveguide (MLW) technology for V-band is proposed in this paper. The conveniently compact design of the filter is then supplied into a streamlined and automated procedure to transfer the design into production data. This in turn eliminates man made errors in production and leaves room for scalability.}, language = {en} } @misc{HeinkenBlumroederAdhikarietal., author = {Heinken, Thilo and Blumr{\"o}der, Jeanette S. and Adhikari, Yojana and Balthasar, Cathrina and Binder, Anja and Birkhofer, Klaus and Bischoff, Antje and Brosinsky, Arlena and Bubner, Ben and Clerc, Danica and Djoudi, El Aziz and Dobkowitz, Sophia and Francke, Till and Gerwin, Werner and Hartong, Heinrich and Hess, Carsten and Jarling, Ren{\´e} and Jouy, Florent and Leinen, Loretta and Meißner, Andreas and Raab, Thomas and Repmann, Frank and R{\"o}nnefarth, Susanne and Schaaf, Wolfgang and Schirrmacher, Marina and Schmehl, Marie-Therese and Schmitt, Thomas and Schr{\"o}der, Jens and Sch{\"u}le, Maren and Sturm, Knut and Welle, Torsten and Ibisch, Pierre L.}, title = {PYROPHOB - A post-fire ecosystem research project to inform management for resilient forest development}, series = {Tuexenia}, volume = {44}, journal = {Tuexenia}, issn = {0722-494X}, doi = {10.14471/2024.44.004}, pages = {35}, abstract = {PYROPHOB (fire-resistant) is the name of an interdisciplinary research project that is running for five years from 2020 to 2025. In this project, eight institutions are investigating the ecological effects of wildfires and subsequent forest management strategies in pine forests (plantations) in Brandenburg (NE Germany), with the aim of formulating practical recommendations for managing fire-prone forests and the effective restoration of post-fire forest areas. We provide a brief overview of what is known about the effects of wildfire on abiotic and biotic parameters in temperate pine forests, as well as the effects of silvicultural treatments. To date, we know little about how different components of biodiversity are linked in post-fire forest ecosystems and how management affects their functioning. By describing the project, we illustrate the requirements for the implementation of such an applied research project. We emphasize the importance of the study design for dealing with interdisciplinary questions and for the quantitative synthesis of research results. The project comprises a set of standardised field plots in two wildfire areas covering different post-fire management options. Fifteen study sites were established, including two reference sites in unburned pine stands, each with ten study plots as replicates. In situ nitrogen mineralisation, litter decomposition tests and soil biological activity are used for soil biological characterisation. Microclimate data is measured continuously. Standing and lying dead wood and tree regeneration are recorded as key indicators of the success of forestry treatments. Further methods com-prise terrestrial laser scanning, remote sensing techniques as well as surveys of vegetation and above and below ground biomass. Identification of fruiting body-forming fungi, phytoparasites and ectomycorrhizal fungi is supported by marker gene sequencing. Faunistic indicators comprise predatory soil arthropods (pairs of emergence tents and soil traps), saproxylic beetles (flight traps and funnel traps), moths (automated window traps), mammals (camera traps), and breeding birds (visual and acoustic observation). We discuss the strengths and limitations of the project design. We are able to systematically capture short-term temporal shifts in parameters and trends in post-fire ecosystem development. Research in a real landscape with ongoing environmental changes and interventions pres-ents challenges for experimental design, data analysis and interpretation. The drivers of ecosystem development are rarely completely independent or perfectly balanced, and lack of replication is ine-vitable. The two fires did not occur in the same year and season, resulting in different initial conditions for the colonisation of the burned areas. Finally, a large part of one study area was again affected by a fire in 2022, which destroyed direct comparability with the other sites. Despite these obstacles the project has started to generate valuable results to address management and conservation challenges.}, language = {en} } @misc{KanitkarDoernerJohansenetal., author = {Kanitkar, Abhijeet Kanitkar and Doerner, Ralf Doerner and Johansen, Tom Keinicke and Heinrich, Wolfgang and Flisgen, Thomas}, title = {On-wafer 16-term calibration for characterization of InP HBTs featuring sub-THz fmax}, series = {2025 55 th European Microwave Conference Proceedings}, journal = {2025 55 th European Microwave Conference Proceedings}, publisher = {IEEE}, address = {Piscataway, NJ}, isbn = {978-2-87487-081-1}, doi = {10.23919/EuMC65286.2025.11235132}, pages = {687 -- 690}, abstract = {In this paper, InP HBTs featuring maximum oscillation frequencies fmax in the sub-THz range are characterized by conducting on-wafer 16 -term calibration. A direct comparison between 8 -term calibration and 16 -term calibration demonstrates that the 16 -term calibration improves the way transistor Mason's gain is derived. The on-wafer measurements of transistors with emitter widths of 0.5μm and 0.85μm yield extracted fmax values of 0.44 THz and 0.33 THz, respectively. The study shows that choosing proper on-wafer calibration techniques is highly important for reliable transistor characterization.}, language = {en} }