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In a project funded by the German Federal Office for Radiation Protection (BfS) two different human skin cell types (HaCaT and HDF) have been exposed under defined environmental conditions to continuous-wave THz radiation at three distinct frequencies of 106 GHz, 380 GHz and 2.52 THz with free-space power densities between 0.03 mW/cm2 and 1.96 mW/cm2 adjusted traceable to the SI units. In three independent...
The constantly growing need for unoccupied and unregulated bandwidth will lead to the extension of operation frequencies of ultrabroadband communication systems into the lower Terahertz frequency range. Here we present first channel measurements at 300 GHz for two simple indoor scenarios, a point-to-point link on a desktop and a connection from a desktop to an access point within an office room. For...
In vitro field exposition experiments with biological samples performed to explore possible detrimental effects of non-ionizing radiation on biological systems require appropriate experimental setups, careful control and monitoring of environmental and exposition conditions and a reliable dosimetry to quantify the amount of stress imposed upon the sample. In the Terahertz frequency range, the experimental...
Using THz radiation as reliable measurement tool requires the accurate knowledge of beam properties. We present approaches to scan beam profiles and measure the radiation power traceable to SI units between 0.1 and 2.5 THz.
This paper presents ultra broadband channel measurements in a typical office room. The measured channel impulse response and transfer function is compared to a ray tracing simulation performed with a 3D model of the scenario. Additionally, we show reflection losses of the building materials in the room which are required as input data for the ray tracing algorithm.
Recently, analogue video signal transmission at 300 GHz has been demonstrated using a versatile Schottky mixer based measurement system designed for terahertz communication channel modelling and propagation studies. In this reported work, digital signal transmission at 300 GHz using this system is demonstrated and analysed. The performance of the digital transmission setup is characterised with respect...
This paper gives an overview of current issues in the field of mm-wave and THz communications. A concept for radio channel modeling is presented together with the latest channel investigation results in this frequency range. In addition we discuss the status quo of standardization activities and the worldwide ongoing spectrum allocation plans.
Initiated by the German Federal Office for Radiation Protection (BfS) field exposition experiments have been designed to examine genotoxic effects of THz radiation in vitro. Under defined environmental conditions, two different human skin cell types are exposed to continuous-wave radiation at six distinct frequencies between 100 GHz and 2.52 THz originating from different sources of THz radiation...
Complex measurement systems being assembled on site have been found to suffer from electromagnetic interference although components of the systems passed the required electromagnetic compatibility (EMC) tests. We present an on-site test system that allows for the EMC evaluation of on-site assembled large measuring system installations in the frequency range from 27 MHz up to 5.8 GHz and propose a...
A 300 GHz channel measurement and transmission system designed for the characterization of THz communication channels has been set up. It consists of autarkic transmitter and detector units based on Schottky diode mixers. The system performance is shown including signal levels and noise. For demonstration of THz communications, analogue video signals have been transmitted over distances of up to 22...
A 300 GHz transmission system, designed for terahertz communication channel modelling and propagation studies, is introduced. It consists of an autarkic transmitter and detector units based on Schottky diode mixer technology. The system performance is characterised with regard to link budget and noise. For demonstration, analogue video signals have been transmitted over distances of up to 22 m.
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