Viktor Krozer
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View article: Structural Health Monitoring of Aerial Vehicles Using Guided Electromagnetic Waves in K-Band: Initial Damage Detection Results from Drone Flight Testing
Structural Health Monitoring of Aerial Vehicles Using Guided Electromagnetic Waves in K-Band: Initial Damage Detection Results from Drone Flight Testing Open
This paper introduces a novel structural health monitoring (SHM) approach based on guided electromagnetic waves propagating in a dielectric waveguide in the frequency range from 23.5 to 26 GHz. This approach enables the detection of struct…
View article: Monolithically Integrated THz Detectors Based on High-Electron-Mobility Transistors
Monolithically Integrated THz Detectors Based on High-Electron-Mobility Transistors Open
We present THz direct detectors based on an AlGaN/GaN high electron mobility transistor (HEMT), featuring excellent optical sensitivity and low noise-equivalent power (NEP). These detectors are monolithically integrated with various antenn…
View article: Radar-Based Damage Detection in a Wind Turbine Blade Using Convolutional Neural Networks: A Proof-of-Concept Under Fatigue Loading
Radar-Based Damage Detection in a Wind Turbine Blade Using Convolutional Neural Networks: A Proof-of-Concept Under Fatigue Loading Open
This paper reports a convolutional neural network (CNN)-based damage detection approach for radar-based structural health monitoring of wind turbine blades. Subsequent radar measurements are transformed into an image-type representation fo…
View article: A Novel First-Principles Model of Injection-Locked Oscillator Phase Noise
A Novel First-Principles Model of Injection-Locked Oscillator Phase Noise Open
The paper documents the development of a novel time-domain model of injection-locked oscillator phase-noise response. The methodology follows a first-principle approach and applies to all circuit topologies, coupling configurations, parame…
View article: D7.3 - Millimeter-Wave Spectroscopy for Evaluating Blood Coagulation and Clotting
D7.3 - Millimeter-Wave Spectroscopy for Evaluating Blood Coagulation and Clotting Open
View article: P41 - Innovating THz Detectors: Unmatched Sensitivity at Room Temperature,Infinite Possibilities
P41 - Innovating THz Detectors: Unmatched Sensitivity at Room Temperature,Infinite Possibilities Open
View article: Numerical and Experimental Analysis of a Reversible Damage Model for Millimeter-Wave Diagnostics of Glass Fiber Reinforced Polymer Structures
Numerical and Experimental Analysis of a Reversible Damage Model for Millimeter-Wave Diagnostics of Glass Fiber Reinforced Polymer Structures Open
View article: Potential and Limitations of Anomaly Detection via Tower-Radar Monitoring of Wind Turbine Blades in Regular Operation with Convolutional Networks
Potential and Limitations of Anomaly Detection via Tower-Radar Monitoring of Wind Turbine Blades in Regular Operation with Convolutional Networks Open
The authors have already presented a first analysis of a field study on radar- based structural health monitoring of rotor blades on two operational wind turbines. This analysis will now be extended with measurements from a third operation…
View article: Towards reliability assessment of ultra-wideband microwave leakage monitoring in detecting stringer debondings in composite airframes
Towards reliability assessment of ultra-wideband microwave leakage monitoring in detecting stringer debondings in composite airframes Open
Ultra-wideband guided electromagnetic waves have been proposed recently for non-destructive testing and structural health monitoring applications. Among the multitude of possible microwave waveguides, recent works explored the concept of m…
View article: Structural Health Monitoring of Aerospace Structures using Guided Electromagnetic Waves in a Dielectric Waveguide at Ka-Band
Structural Health Monitoring of Aerospace Structures using Guided Electromagnetic Waves in a Dielectric Waveguide at Ka-Band Open
Dielectric waveguide (DW) antenna systems are widely used in millimeter-wave radar applications. A large and innovative field is structural health monitoring (SHM) of aerospace structures. The proposed research aims at detecting structural…
View article: Table of Contents
Table of Contents Open
The field of Microwave research and industrial engineering keeps evolving at a fast pace, enabling socially relevant developments in the areas of communication, automotive traffic, medical diagnostics and sustainable agriculture, to name j…
View article: Trend Decomposition for Temperature Compensation in a Radar-Based Structural Health Monitoring System of Wind Turbine Blades
Trend Decomposition for Temperature Compensation in a Radar-Based Structural Health Monitoring System of Wind Turbine Blades Open
The compensation of temperature is critical in every structural health monitoring (SHM) system for achieving maximum damage detection performance. This paper analyses a novel approach based on seasonal trend decomposition to eliminate the …
View article: Microwave Structural Health Monitoring of the Grouted Connection of a Monopile-Based Offshore Wind Turbine: Fatigue Testing Using a Scaled Laboratory Demonstrator
Microwave Structural Health Monitoring of the Grouted Connection of a Monopile-Based Offshore Wind Turbine: Fatigue Testing Using a Scaled Laboratory Demonstrator Open
Offshore wind turbines play a significant role in the expansion of clean and renewable energy. However, their exposure to harsh marine environments and dynamic loading conditions poses significant challenges to their structural integrity. …
View article: Sub-THz X-Haul Architecture with Ultra Capacity Wireless Distribution and Transport
Sub-THz X-Haul Architecture with Ultra Capacity Wireless Distribution and Transport Open
X-haul is a key evolution in novel 5G and 6G RAN architectures to transform the traditional backhaul-fronthaul scheme in a more complex nodes structure, introducing midhaul links, to satisfy the growing demand of traffic and quality of ser…
View article: Sub-THz X-Haul Architecture with Ultra Capacity Wireless Distribution and Transport
Sub-THz X-Haul Architecture with Ultra Capacity Wireless Distribution and Transport Open
X-haul is a key evolution in novel 5G and 6G RAN architectures to transform the traditional backhaul-fronthaul scheme in a more complex nodes structure, introducing midhaul links, to satisfy the growing demand of traffic and quality of ser…
View article: Embedded radar networks for damage detection in wind turbine blades: validation in a full-scale fatigue test
Embedded radar networks for damage detection in wind turbine blades: validation in a full-scale fatigue test Open
This paper presents the design and experimental realization of a cooperative radar network for structural health monitoring (SHM) of wind turbine blades. For this purpose, 40 FMCW (frequency-modulated continuous wave) radar sensors operati…
View article: Numerical and Experimental Studies on the Micro-Doppler Signatures of Freely Flying Insects at W-Band
Numerical and Experimental Studies on the Micro-Doppler Signatures of Freely Flying Insects at W-Band Open
Remote sensing techniques in the microwave frequency range have been successfully used in the context of bird, bat and insect measurements. This article breaks new ground in the analysis of freely flying insects by using a continuous-wave …
View article: A Wideband Ultra-Low Current Noise Transimpedance Amplifier for Ultrafast Wideband THz Communication
A Wideband Ultra-Low Current Noise Transimpedance Amplifier for Ultrafast Wideband THz Communication Open
This work reports a wideband transimpedance amplifier MMIC with ultra-low input referred noise current. Being based on transferred substrate InP DHBT process, this work achieves a significant leap forward for ultra-low noise transimpedanc…
View article: Temperature dependence studies of tissue-mimicking phantoms for ultra-wideband microwave breast tumor detection
Temperature dependence studies of tissue-mimicking phantoms for ultra-wideband microwave breast tumor detection Open
Microwave imaging (MWI) systems are being investigated for breast cancer diagnostics as an alternative to conventional x-ray mammography and breast ultrasound. This work aims at a next generation of tissue-mimicking phantoms modelling the …
View article: Conditions for Oscillator Small-Signal Amplitude-Phase Orthogonality
Conditions for Oscillator Small-Signal Amplitude-Phase Orthogonality Open
The paper explores a previously unknown connection relating the symmetry properties of an oscillator steady-state to the orthogonal representation of amplitude and phase variables in the small-signal regime. It is shown that only circuits …
View article: EXPERIMENTAL FEASIBILITY STUDY OF USING MMWAVE FOR ARTERIAL RADIAL DISPLACEMENT MONITORING
EXPERIMENTAL FEASIBILITY STUDY OF USING MMWAVE FOR ARTERIAL RADIAL DISPLACEMENT MONITORING Open
Doppler Ultrasound as the gold standard for noninvasive arterial pulsation monitoring has limitations such as dependency on the operator and absence of acoustic window in some patients.Recently, mm-wave has been propounded as an alternativ…
View article: TOWARDS LOCALIZATION AND CLASSIFICATION OF BIRDS AND BATS IN WINDPARKS USING MULTIPLE FMCW-RADARS AT KA-BAND
TOWARDS LOCALIZATION AND CLASSIFICATION OF BIRDS AND BATS IN WINDPARKS USING MULTIPLE FMCW-RADARS AT KA-BAND Open
Birds and bats are at risk when they are flying near wind turbines (WT).Hence, a protection of bats and birds is postulated to reduce their mortality, e.g., due to collisions with the rotor-blades.The use of radar technology for monitoring…
View article: Integrated Optical-Wireless Interface and Detection
Integrated Optical-Wireless Interface and Detection Open
This chapter elaborates on the beneficial aspects and hardware implementations of incorporating ultradense WDM-PONs (UDWDM-PONs) with hybrid optical-wireless fronthaul links and fiber to the home applications. Simulation results on the syn…
View article: A generalized model of coupled oscillator phase‐noise response
A generalized model of coupled oscillator phase‐noise response Open
Summary Model frameworks, based on Floquet theory, have been shown to produce effective tools for accurately predicting phase‐noise response of single (free‐running) oscillator systems. This method of approach, referred to herein as macro‐…
View article: Clinical assessment of W-band spectroscopy for non-invasive detection and monitoring of sustained hyperglycemia
Clinical assessment of W-band spectroscopy for non-invasive detection and monitoring of sustained hyperglycemia Open
HbA1c is the gold standard test for monitoring medium/long term glycemia conditions in diabetes care, which is a critical factor in reducing the risk of chronic diabetes complications. Current technologies for measuring HbA1c concentration…
View article: Radar‐based monitoring of glass fiber reinforced composites during fatigue testing
Radar‐based monitoring of glass fiber reinforced composites during fatigue testing Open
This work aims at radar sensors in the frequency band from 57 to 64 GHz that can be embedded in wind turbine blades during manufacturing, enabling non-destructive quality inspection directly after production and structural health monitorin…
View article: Toward the first D-band Point to multipoint wireless system field test
Toward the first D-band Point to multipoint wireless system field test Open
The European Commission Horizon 2020 ULTRAWAVE "Ultra capacity wireless layer beyond 100 GHz based on millimeter waves" is in the final stage of development. The first ever field test of a D-band point to multipoint wireless system will be…
View article: A Highly Linear Dual-Stage Amplifier With Beyond 1.75-THz Gain–Bandwidth Product
A Highly Linear Dual-Stage Amplifier With Beyond 1.75-THz Gain–Bandwidth Product Open
This work reports a multi-purpose highly linear ultra-wideband amplifier with a gain bandwidth product (GBP) of 1.75 THz, the highest reported in any MMIC process. A transimpedance amplifier is cascaded with a distributed amplifier, emulat…
View article: Ultra‐wideband on‐body elliptical monopole antenna
Ultra‐wideband on‐body elliptical monopole antenna Open
This study presents an ultra‐wideband, elliptical slot, planar monopole antenna for early breast cancer microwave imaging. The on‐body antenna's operation is optimised by direct contact with the patient's skin. With a compact size of 9 × 7…
View article: Connecting Chips With More Than 100 GHz Bandwidth
Connecting Chips With More Than 100 GHz Bandwidth Open
Connecting chips within a module is a basic requirement in transforming MMIC performance to system functionality. More and more applications demand for operation at high mm-wave frequencies or with ultra-large bandwidth. While semiconducto…