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In future sixth-generation (6G) wireless communications, carrier frequencies above 100 GHz will be used where large bandwidthsare still available that enable high-capacity wireless links. This poster presents an overview of my research on the characterization of radio propagation at D-band frequencies, ranging from 110 to 170 GHz, for indoor and outdoor environments. The envisioned applications for indoor environments include video streaming, virtual and augmented reality (AR/VR), and a wireless hub. For outdoor environments, fixed wireless access (FWA) networks are envisioned, providing internet connectivity as an alternative to fiber. Empirical channel modelsare presented based on measurement campaigns, using a vector network analyzer-based channel sounder for the indoor environments, and a spectrum analyzer-based channel sounder for the outdoor environments. Penetration and reflection loss measurements for different materials show a periodic pattern over the full band. Reflection loss values range from 4 dB for a tabletop up to 20 dB for a cardboard box. The spatio-temporal channel model for a conference room environment confirms the channel sparsity with respect to multipath components. For outdoor environments, Line-of-Sight (LOS) and non-Line-of-Sight (NLOS) path loss models are presented, as well as building reflection loss measurements and a new vegetation loss model. The outdoor channel models are used in link budget calculationsto estimate received power as a function of distance for a fixed transmit power and antenna gain. The received power estimate is used to calculate the signal-to-noise ratio from which the channel capacity can be determined, which confirms that D-band frequencies can be used to realize FWA networks.

High-frequency wireless technologies realize fixed wireless access networks as an alternative to fiber for bringing high-throughput internet connectivity to the home. In the design of wireless networks, channel models are of utmost importance for having realistic link budget calculations. This paper provides a measurement setup for obtaining rain attenuation values in the V-band, ranging from 50 to 75 GHz. By continuously measuring received power over an extended time, and linking path loss data to meteorological data, we see that rain attenuation for moderate rain intensity ranges from 0.12 dB/m at 55 GHz, to 0.22 dB/m at 70 GHz. Furthermore, other meteorological phenomena also impact measured attenuation.

In the shipping industry, wireless communication systems are desired for enabling digitalization and tracking advancements throughout the complete shipping process. In this paper, we present an 868 MHz path loss model for outdoor industrial container terminal environments, based on a measurement campaign using a spectrum analyzer-based channel sounder. Due to the container layout, i.e., containers are stacked in rows with gaps in between, the path loss exponent of the one-slope path loss model is very low. The container stack attenuation equals 21 dB, which is much higher than the penetration loss of objects in other industrial environments.