Haussmann, SimonSimonHaussmannGuenter, MarcMarcGuenterTessmann, AxelAxelTessmannKallfass, IngmarIngmarKallfass2025-06-132025-06-132025https://publica.fraunhofer.de/handle/publica/48860210.23919/GeMiC64734.2025.10979193In this paper we demonstrate the design of H-band waveguide filters for communication purposes. Based on simple design equations, aided by 3D-FEM simulations, we show that with standard microwave H-plane iris filters, we can achieve waveguide diplexer, covering the whole WR-3.4-band from 220 - 325 GHz and are thus predestined for sub-THz communication links. The design and the applicability for duplex data links is further evaluated in real-time over-the-air communication experiments.enmicrowave filtersTerahertz communicationsDuplex communication systemsconference paper