Dirk Heberling
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View article: Definition and Validation of an Exposure Measurement Method for a Typical Load of a Base Station
Definition and Validation of an Exposure Measurement Method for a Typical Load of a Base Station Open
In the context of risk communication in mobile radio, a discussion has emerged whether exposure at common load of a base station should be presented in addition to the theoretical maximum, especially with 5G massive‐MIMO. However, a reprod…
View article: Numerical Analysis of Mask-Based Phase Reconstruction in Phaseless Spherical Near-Field Antenna Measurements
Numerical Analysis of Mask-Based Phase Reconstruction in Phaseless Spherical Near-Field Antenna Measurements Open
Phase-retrieval problems are employed to tackle the challenge of recovering a complex signal from amplitude-only data. In phaseless spherical near-field antenna measurements, the task is to recover the complex coefficients describing the r…
View article: Design and Characterisation of All‐Dielectric Metasurface Reflector for mmWave Antennas
Design and Characterisation of All‐Dielectric Metasurface Reflector for mmWave Antennas Open
This study presents the design, characterisation and prototyping of a novel all‐dielectric artificial magnetic conductor (AMC) operating at 77 GHz. Unlike traditional metallic or hybrid counterparts, the proposed AMC is fabricated entirely…
View article: Generative Adversarial Synthesis of Radar Point Cloud Scenes
Generative Adversarial Synthesis of Radar Point Cloud Scenes Open
For the validation and verification of automotive radars, datasets of realistic traffic scenarios are required, which, how ever, are laborious to acquire. In this paper, we introduce radar scene synthesis using GANs as an alternative to th…
View article: Theory of Seamless-Scanning Periodic Leaky-Wave Antennas based on $\mathcal{PT}$-Symmetry with Time to Space Mapping
Theory of Seamless-Scanning Periodic Leaky-Wave Antennas based on $\mathcal{PT}$-Symmetry with Time to Space Mapping Open
Periodic Leaky-Wave Antennas (P-LWA) offer highly directive and space-scanning radiation. Unfortunately, they have been plagued by the ``broadside issue'', characterized by a degradation in gain when the antenna's main beam is steered acro…
View article: Landmark-Based Vehicle Self-Localization Using Automotive Polarimetric Radars
Landmark-Based Vehicle Self-Localization Using Automotive Polarimetric Radars Open
Automotive self-localization is an essential task for any automated driving function. This means that the vehicle has to reliably know its position and orientation with an accuracy of a few centimeters and degrees, respectively. This paper…
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: Ground Penetrating Radar Data Analysis on Frequency-Domain for Railway Ballast Assessment
Ground Penetrating Radar Data Analysis on Frequency-Domain for Railway Ballast Assessment Open
Railway ballast is one of the key components of the railway that is often problematic.The problems often lie in invisible underground structures, allowing Ground Penetrating Radar (GPR) to play a role in detecting such problems before it's…
View article: Exceptional Point Perspective of Periodic Leaky-Wave Antennas
Exceptional Point Perspective of Periodic Leaky-Wave Antennas Open
Over the past decade, the issue of gain degradation at broadside in periodic leaky-wave antennas (P-LWAs) has been resolved, using a circuit modeling approach, by introducing proper asymmetry in the unit cell of the antenna structure. This…
View article: Multi-Feed Metasurface Antennas: Direct Numerical Design and Experimental Validations
Multi-Feed Metasurface Antennas: Direct Numerical Design and Experimental Validations Open
This paper provides new designs and realizations of leaky-wave (LW) metasurface (MTS) antennas fed at multiple points. The design technique is based on the direct integral-equation solution by the Method of Moments (MoM). The unknown is no…
View article: Digital pattern synthesis with a compact MIMO antenna of half-wavelength diameter
Digital pattern synthesis with a compact MIMO antenna of half-wavelength diameter Open
The paper presents a compact multiport antenna, with beamforming capabilities and a realized gain of 4.31 dBi with the size of λ/2. The antenna allows digital beamforming with independent control over three parameters: main-beam direction,…
View article: The driving circuit of the waveguide RF Wien filter for the deuteron EDM precursor experiment at COSY
The driving circuit of the waveguide RF Wien filter for the deuteron EDM precursor experiment at COSY Open
The waveguide RF Wien filter is one of the key components of the JEDI project at the COoler SYnchrotron in Jülich. The driving circuit constitutes a fundamental part of the waveguide RF Wien filter. When running at the spin precession freq…
View article: Measurement and mitigation of electromagnetic emissions of propulsion inverters for electric vehicles
Measurement and mitigation of electromagnetic emissions of propulsion inverters for electric vehicles Open
A key characteristic of today’s switched mode power converters are their conducted electromagnetic emissions (EMEs). To apply mitigation techniques with minimal weight, volume and costs, a converter’s EME should be identified by simulation…
View article: Storage Ring to Search for Electric Dipole Moments of Charged Particles -- Feasibility Study
Storage Ring to Search for Electric Dipole Moments of Charged Particles -- Feasibility Study Open
The proposed method exploits charged particles confined as a storage ring beam (proton, deuteron, possibly $^3$He) to search for an intrinsic electric dipole moment (EDM) aligned along the particle spin axis. Statistical sensitivities coul…
View article: Feasibility Study for an EDM Storage Ring
Feasibility Study for an EDM Storage Ring Open
This project exploits charged particles confined as a storage ring beam (proton, deuteron, possibly $^3$He) to search for an intrinsic electric dipole moment (EDM, $\vec d$) aligned along the particle spin axis. Statistical sensitivities c…
View article: A novel waveguide RF Wien filter for electric dipole moment measurements of deuterons and protons at the COoler SYnchrotron (COSY)/Jülich
A novel waveguide RF Wien filter for electric dipole moment measurements of deuterons and protons at the COoler SYnchrotron (COSY)/Jülich Open
The matter-antimatter asymmetry in the universe cannot be explained by the level of predicted CP-violation sources in the Standard Model (SM) of particles. As a possible explanation, is the existence of permanent electric dipole moment (ED…
View article: Computational framework for particle and spin simulations based on the stochastic Galerkin method
Computational framework for particle and spin simulations based on the stochastic Galerkin method Open
An implementation of the polynomial chaos expansion is introduced as a fast solver of the equations of beam and spin motion of charged particles in electromagnetic fields. We show that, based on the stochastic Galerkin method, our computat…
View article: Spin tune mapping as a novel tool to probe the spin dynamics in storage rings
Spin tune mapping as a novel tool to probe the spin dynamics in storage rings Open
Precision experiments, such as the search for electric dipole moments of charged particles using storage rings, demand for an understanding of the spin dynamics with unprecedented accuracy. The ultimate aim is to measure the electric dipol…
View article: Phase Locking the Spin Precession in a Storage Ring
Phase Locking the Spin Precession in a Storage Ring Open
This Letter reports the successful use of feedback from a spin polarization measurement to the revolution frequency of a 0.97 GeV/c bunched and polarized deuteron beam in the Cooler Synchrotron (COSY) storage ring in order to control both …
View article: Electrically small antenna with switchless pattern reconfiguration
Electrically small antenna with switchless pattern reconfiguration Open
An electrically small pattern reconfigurable antenna is proposed. It allows adjustment of the radiation pattern by applying a phase shift between its two ports. The structure is a cylinder with λ/5 diameter. Simulated results show good ope…
View article: Axial ratio correction for GNSS antennas in asymetrically coupled environments
Axial ratio correction for GNSS antennas in asymetrically coupled environments Open
The paper demonstrates a technique to correct the axial ratio of dual-fed circularly-polarized antennas in the presence of strong coupling with surrounding components or asymmetrically reduced ground plane. It demonstrated - based on a sta…
View article: Description and Results: Antenna Measurement Facility Comparisons [Measurements Corner]
Description and Results: Antenna Measurement Facility Comparisons [Measurements Corner] Open
In recent years, formalized facility comparison activities have become important for the documentation and validation of laboratory proficiency and competence and mandatory for achieving accreditation such as that of the International Orga…
View article: Broadside Dual-Channel Orthogonal-Polarization Radiation Using a Double-Asymmetric Periodic Leaky-Wave Antenna
Broadside Dual-Channel Orthogonal-Polarization Radiation Using a Double-Asymmetric Periodic Leaky-Wave Antenna Open
The paper demonstrates that double unit-cell asymmetry in periodic leaky-wave\nantennas (P-LWAs), i.e. asymmetry with respect to both the longitudinal and\ntransversal axes of the structure -- or longitudinal asymmetry (LA) and\ntransversa…
View article: Easy-to-deploy LC-loaded dipole and monopole antennas for cubesat
Easy-to-deploy LC-loaded dipole and monopole antennas for cubesat Open
This paper proposes a new approach to reduce weight and complexity of VHF/UHF cubesat antennas by utilizing a dual band antenna, rather than standard two-antenna system routinely implemented in cubesats. Three systems are compared: A stand…
View article: Directional Modulation for Compact Devices
Directional Modulation for Compact Devices Open
A new directional modulation system that uses radiation pattern data for modulation encoding is proposed. The approach allows compact multiport antennas (e.g., MIMO-capable antennas) to be used for directional modulation, replacing extensi…
View article: Simultaneous rotation and distance measurement using multiband circularly polarized radio link
Simultaneous rotation and distance measurement using multiband circularly polarized radio link Open
The paper proposes a method for simultaneous measurement of rotation and distance by using a multi-band circularly polarized radio links. The method is realized using a standard dual-band patch antenna, operating at 1.58 GHz and 2.27 GHz, …
View article: Reconfigurable Axial Ratio in Compact GNSS Antennas
Reconfigurable Axial Ratio in Compact GNSS Antennas Open
A new adaptive technique for steering the direction of minimum axial ratio (AR) (<;1 dB) toward the reflected or jamming signal is proposed for global navigation satellite systems antennas. It relies on simple, low cost commercially availa…