A5000166770- Millimeter-Wave Propagation and Modeling
- Terahertz technology and applications
- Microwave Engineering and Waveguides
- Antenna Design and Analysis
- Advanced MIMO Systems Optimization
- Metamaterials and Metasurfaces Applications
- Wireless Body Area Networks
- Photonic and Optical Devices
- Radio Wave Propagation Studies
- Photonic Crystals and Applications
- Microwave Imaging and Scattering Analysis
- Plant Pathogens and Resistance
- Indoor and Outdoor Localization Technologies
- Soil Moisture and Remote Sensing
- Molecular Communication and Nanonetworks
- Microwave and Dielectric Measurement Techniques
- Advanced Antenna and Metasurface Technologies
- Gamma-ray bursts and supernovae
- Telecommunications and Broadcasting Technologies
- Insect and Arachnid Ecology and Behavior
- Radio Frequency Integrated Circuit Design
- Plant and animal studies
- Electrostatic Discharge in Electronics
- Powdery Mildew Fungal Diseases
- Advanced Biosensing Techniques and Applications
University of Duisburg-Essen
2016-2025
National University of Sciences and Technology
2023
The use of massive multiple-input multiple-output (MIMO) systems is becoming progressively feasible, as well important, the carrier frequency increases. Terahertz (THz) frequencies lead to smaller-sized RF components including antennas, so that even antenna arrays with a large number antennas have reasonable form factor while providing beamforming gain and multi-user MIMO (MU-MIMO) capability. However, THz propagation mechanisms differ in various ways from previously explored channels. In...
The channel in the terahertz (THz) band is extremely frequency selective. This study demonstrates a ray-tracing method for modelling short-range propagation channels at THz band. response of sounding bandwidth and centre on power delay profile (PDP) investigated five spectral windows with relatively low attenuations higher available bandwidths which could possibly offer terabit-per-second links also. In this approach, very detailed non-cubic three-dimensional model an ultra-broadband indoor...
In recent years, terahertz (THz) systems have become an increasingly popular area of research thanks to their unique properties such as extremely high data rates towards Tb/s, submillimeter localization accuracy, resolution remote sensing materials, and remarkable advances in photonics electronics technologies. This article traces the progress THz measurements, antennas simulations, from historical milestones current state provides outlook on remaining challenges.
In this paper, new concepts for continuous 24/7 real-time monitoring of plants and insects with miniaturized terahertz (THz) systems are described experimentally tested. Thus, the first time, small-scale insights into instantaneous plant health but also in their long-term growth can be obtained. Using such compact THz systems, e.g. water uptake, insect infestation behavior pollinators (i.e. honey bees) pests measured dynamically non-invasively at virtually any position close biotope...
Channel measurements across 300 GHz to 310 spectrum are performed realize the ultra-broadband wireless communication channel behaviour for various configurations in lecture room environment. At terahertz (THz) frequencies, it is believed that high directional antenna based line-of-sight (LoS) possibly achieves terabitper-second (Tbps) links. Thereupon, VNA-based using 26 dBi horn antennas at both transmitter (TX) and receiver (RX) sides retrieving parameters (i.e., path loss exponent,...
Terahertz (THz) technology provides precise monitoring capabilities in dynamic environments, offering unique insights into insect habitats. Our study focuses on environmental of European honey bees (Apis mellifera) through a combination measurements and simulations. Initially, the dielectric material properties bee body parts are characterized across spectral range 1-500 GHz to collect heterogeneous empirical data. To extend study, mockups made from polyamide 12 (PA12) epoxy resin employed...
This paper presents a novel self-programmed three-dimensional (3D) ray-tracing algorithm (RTA) based on Beckmann-Kirchhoff (B-K) model for modeling diffuse scattering mechanism in non-specular directions at terahertz (THz) frequencies. The or submillimeter-wave frequencies pose unique challenges channel due to sparse and extreme frequency selective behaviour of the propagation mechanism. In particular, most critical feature proved provide important contributions determining spatial temporal...
The problem of wave propagation and scattering at terahertz (THz) frequencies has become increasingly important, in particular for accurate modeling future indoor wireless communication channels. reflective properties materials with different surface roughness dielectric constants are important to explore diffuse channel modeling. First foremost, a <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Swissto12</i> system is adopted obtain the...
For centuries, fabrics have been a staple in human life, primarily as clothing materials. However, their role has evolved into versatile materials with innovative applications textile-based electronics, including fashion technology, smart fabrics, and interactive textiles. Furthermore, can function electromagnetic (EM) wave-absorbing, wave-transparent This paper reports findings from transmission measurements using THz-TDS THz-FDS setup the 100 to 1000 GHz frequency range. Diverse natural,...
At terahertz (THz) frequencies, dimensions of optically thin building materials (e.g., sand-lime brick, gypsum plaster) are comparable to or even larger than the wavelength. Such materials, normally neglected and assumed smooth evidently become rough now. A material will reflect incident ray specularly in a single direction, whilst scatter it into various directions. Perhaps, for very specular reflection loses its privileged position, non-specular diffusely scattered rays dominate behaviour....
Frequency Modulated Continuous Wave radar systems offer a very large dynamic measurement range, while at the same time they can be fabricated compact and cost efficient. Due to this, FMCW-sensors are feasible alternative costly equipment like vector network analyzers. Applying calibration techniques algorithms from VNA domain, also used characterize materials with high precision. At time, short allows their use in mobile precision setups. This paper presents such setup that is easily...
The human appearance can be interpreted as a disturbance, convenience or even necessity, for example, in technical applications with human-robot interaction and human-gesture detection. This implies the need implementing realistic digital twin its positions, gestures individual movements ray-tracing simulations. Thus, bringing harmony between simulation measurement owing to more assumptions within environment. In this paper, human-digital combo is primarily re-alized based on two rationales:...
In this paper, we present first results of ray-tracing simulations a realistic office environment across wide spectrum from 100 GHz (0.1 THz) to 1000 (1.0 THz). This model is used study the channel characteristics and analyze variation in received power delay profile. Furthermore, frequency dependent atmospheric attenuation has been considered contribution as an important parameter affecting each path based on ray-path length. We succeeded incorporate models International Telecommunication...
With the advancement of technology, shielding for terahertz (THz) electronic and communication equipment is increasingly important. The metamaterial absorption technique mostly used to shield electromagnetic interference (EMI) in THz sensing technologies. most widely absorbers suffer from their narrowband properties involvement complex fabrication techniques. Materials with multifunctional properties, such as adjustable conductivity, broad bandwidth, high flexibility, robustness, are driving...
The scattering phenomenon caused by rough surfaces has a dominant role in shaping the reflected field at terahertz (THz) frequencies, both specular and non-specular directions. Most nature are randomly rough, surface height obeys certain statistical distribution. A Gaussian probability density function (PDF) for distribution is often considered, correlation length assumed to be longer than wavelength. However, clear understanding of how changing these assumptions affect angular scattered...
Wireless propagation channels affected by blocking objects both static as well dynamic impact the resultant signal quality. The role of human in this aspect is ambivalent desiring for reliable connections and increased data rates. However, humans being non-transparent to electromagnetic waves obstruct paths between transmitter (TX) receiver (RX) impacting channel propagation. Terahertz (THz) spectrum though providing bandwidths several GHz with corresponding rates beyond 100 Gb/s...
Presented in this paper are unexplored aspects of terahertz (THz) ray-tracing from antennas to propagation domains. Firstly, we come forth with a realistic angle spacing (or interval) for exporting composite 3D beam antenna patterns into shooting bouncing (SBR) method also verified by measurement data at 300 GHz carrier frequency. Further, the simulation results obtained random and non-random rough surfaces frequency interest simple office environment encompassing both line-of-sight (LOS)...
In this paper, we present an ultra-broadband terahertz (THz) channel model in typical office environment across a wide spectrum from 300 GHz (0.3 THz) to 310 (0.31 THz). This ray-tracing is used study the indoor multipath propagation and its impact on by considering smooth rough surfaces. These multipaths between Transmitter (TX) Receiver (RX) are computed according Kirchhoff Approximation, which accounts for specular losses introducing Rayleigh roughness factor calculated surface height...
In this paper, we study the terahertz (THz) transmission channels from 100 GHz (0.1 THz) to 1000 (1 by including effects of frequency-dependent atmospheric attenuation and diffuse reflection (non-specular scattering) due surface roughness for short-range indoor wireless communications. First foremost, ITU-R Rec. P. 676-8 model has been used compute water-vapor content in atmosphere demonstrating multipath channel transfer function (CTF) dynamics line-of-sight (LoS) non-line-of-sight (NLoS)...