A5000715037- Antenna Design and Analysis
- Antenna Design and Optimization
- Advanced Antenna and Metasurface Technologies
- RFID technology advancements
- Electromagnetic Compatibility and Noise Suppression
- Electromagnetic Compatibility and Measurements
- Microwave Engineering and Waveguides
- Radio Frequency Integrated Circuit Design
- Advancements in PLL and VCO Technologies
- Electromagnetic Scattering and Analysis
- Electromagnetic Simulation and Numerical Methods
- Energy Harvesting in Wireless Networks
- Sensor Technology and Measurement Systems
- Advanced Power Amplifier Design
- Metaheuristic Optimization Algorithms Research
- Power Line Communications and Noise
- Electrostatic Discharge in Electronics
- Analog and Mixed-Signal Circuit Design
- Electric Motor Design and Analysis
- Model Reduction and Neural Networks
- Semiconductor Lasers and Optical Devices
- Radio Wave Propagation Studies
- DNA and Biological Computing
- Control Systems and Identification
- Silicon Carbide Semiconductor Technologies
Silicon Austria Labs (Austria)
2022-2024
Graz University of Technology
2014-2024
Infineon Technologies (Austria)
2022
Institute for Research in Fundamental Sciences
2010-2021
Linz Center of Mechatronics (Austria)
2005-2006
A direct quadrature voltage modulator has been disclosed and current mode upconversion mixer with linearity boosting technique as preferred concepts for WCDMA transmitters (TX), enabling a solution TX noise reduction at some duplex distances. Two problems remain unsolved: how to remove the SAW other duplexer distances, support still highly desirable 2G 2.5G modes, required full coverage, without increasing power consumption system complexity. multimode was addressed but far-off performance...
Due to high gain and low production costs, Yagi-Uda antennas still find wide applications in wireless communication systems. The sensitivity of the due variations element lengths distances between elements makes design optimization quite challenging. In this paper, multi-objective a six-element antenna applying an enhanced version firefly algorithm is proposed. application sense allows finding local solutions, too. To minimize computational time, adaptive cost function applied. numerical...
Linear antenna arrays consisting of dipole antennas find wide applications in wireless communication systems. Typically, arrangements with uniform spacing between the array elements are applied to gain highly directive radiation patterns while controlling intensity side lobes. To describe such arrangements, so-called pattern multiplication (PM) technique is frequently applied, which inherently neglects inter-element coupling. In this paper, an arrangement non-uniformly synthesized...
In ultra-high-frequency radio-frequency-identification (UHF-RFID) the conjugate complex matching of packaged UHF-RFID transponder IC and tag antenna structure is important to increase reading range tag. Quite often half-wavelength dipole-like structures are used. Due fact that impedances dipole in different domains, a needed accomplish matching. A common technique carry out so called T-match. Since nominal input impedance depends on applied voltage (and strongly non-linear way), backscatter...
The near-field communication (NFC) technique finds wide applications in many aspects of modern life, e.g., contactless payment systems or authentication. Regardless the application, typically, requirements on antenna structure are manifold. Frequently, limitations available space make design quite challenging. Beside geometrical limitations, also matching to analog front end NFC transponder IC has be taken into account. Furthermore, together with connected fulfill specific standardized...
A digital polar transmitter is presented that uses a digital-to-time-converter (DTC) for wide-channel phase modulation with multiband support. DTC-based enables high-efficiency operation RFDAC. The coarse division inherent in DTC to generate TX output frequencies from 0.7 2.2 GHz limited DCO tuning range of only 7.3-8.7 (±8.7%). Phase narrowband signals (e.g., one resource block) using could result spurs spectrum due the almost periodic nature errors. theoretical analysis predicts location...
Energy efficiency is becoming one of the most important topics in electronics. Among others, wide band-gap semiconductors can raise and lead to shrinking volumes power conversion systems. As different markets have regulations that require designs, it necessary cope with a large variety similar designs. By using effective modeling simulation strategies, efforts building these variants be diminished, re-designs avoided. In this paper, we present universally valid way come reasonable results...
In this paper, the problem of connecting unbalanced measurement setup on balanced antenna near-field communication (NFC) system is addressed. The parameters antenna's equivalent circuit were determined using quasi-static and full-wave vector field finite element simulations. Measurements simulations are carried out three different prototypes 13.56 MHz NFC rectangular four turns printed FR4 substrate material. obtained results concerning RLC show that a direct connection devices to structure...
A key issue in proceeding the digitization of phase-locked loops (PLLs) is realization proper phase detectors digital domain. This paper presents simulative analysis properties and requirements for time-to-digital converters (TDCs) used comparison digitized fractional-N modulators with two-point modulation. Effects due to quantization TDC on frequency synthesis as well GSM modulation quality are considered, defining a transmitter
In radio frequency identification (RFID), the design and investigation of ultra-high-frequency (UHF) circular loop antennas used as reader well tag is growing importance. Since these are electrically short, a 2-D finite-element method (FEM) analysis using single-component magnetic vector potential together with perfectly matched layers (PMLs) at boundary proposed in this paper order to perform very fast accurate axisymmetric simulations compared time-consuming 3-D calculations. addition,...
A multirate, fractional-N RF digital phase-locked loop (DPLL) phase modulator implementation for polar transmitter supporting cellular communication standards up to 4G LTE-A is demonstrated the first time. The RF-DPLL integrates LC-tank-based digital-controlled oscillator (DCO) cores with ΔΣ-noise shaping and fractional sample rate conversion account a broad range of frequency bands spectral emission requirements. two-point modulation different sampling rates signal scaling applied optimize...
Wireless communication technologies such as Near Field Communication (NFC) found its way into our everyday life. The antenna structures used in systems have to comply with several standards achieve all requirements defined for the specific application. However, practice there are scenarios antennas which not considered or design guides, but mainly influence behavior. In present paper synthesis of an NFC-cards a contactless payment system under multi-card condition is presented. optimization...
Abstract Electronic based systems (EBS) tend to become smaller in size while at the same time their functionality, complexity, and operating frequencies increase. Therefore, accurate broadband characterization of electric behavior components such EBS is becoming more important for first‐time right designs, especially electromagnetic compatibility (EMC) interference (EMI) issues. Although many manufacturers provide up to, example, 8.5 GHz, there still a lack information about parasitic...
A multirate fractional-N RF digital phase-locked loop (DPLL) phase modulator implementation for polar transmitter supporting cellular communication standards up to 4G LTE-A is demonstrated. The RF-DPLL integrates LC-tank-based digital-controlled oscillator (DCO) cores with Σ-Δ-noise shaping and fractional sample rate conversion account a broad range of frequency bands spectral emission requirements. two-point modulation different sampling rates signal scaling applied optimize the system...
A digital polar transmitter is presented that uses a digital-to-time-converter (DTC) to enable high-efficiency RFDAC for multiband and wide-channel applications. The coarse division inherent in DTC operation generate TX output frequencies from 0.7 2.2 GHz with DCO tuning range of only 7.3–8.7 (±8.7%). was fabricated 14-nm FinFET achieves noise −153/−150 dBc/Hz LTE5/LTE20 Band1 power dissipation 27 mW. implemented using Automatic-Place-and-Route tools, requiring very limited analog layout resources.
Linear antenna arrays find wide applications in wireless communication systems. Typically, arrangements with uniform spacing between the array elements are applied to gain highly directive radiation patterns. Although numerical capabilities of modern computing infrastructures allow analysis complex configurations so called pattern multiplication technique is still applied, especially within optimization arrangements. In present paper limitations this investigated terms analyses typical...
The field regions around antennas are distinguished through the properties of electromagnetic field. knowledge boundaries between these is very important, for example, measurement engineers or in numerical simulation to ensure a proper behavior their results. In this article, validity suggested from literature has been analyzed using error estimations different Analyses conducted on dipole antennas, loop as well Yagi-Uda arrays with various dimensions. addition, concepts introduced, allowing...
Developing simulation models for electromagnetic field problems often deals with approximations of the full set Maxwell's equations, to obtain performant methods.This is also case so-called Darwin model, which has capability including resistive, inductive, and capacitive effects without need solving full-wave equations.However, an issue difficulty prescribing realistic excitations e.g., via a terminal voltage.In this article, straightforward prescription scalar potential on electric ports...
A major design criterion of wireless communication devices is the matching between impedance analog frontend and input antenna structure. Especially for passive systems, essential to ensure good performance. Numerical tools are typically utilized in process determine impedance. Additionally, measurements on prototype designs carried out verify simulation results. Frequently, vector network or analyzers used measure design. Regardless measurement device use, a connection it under test has be...
Linear antenna arrays consisting of dipole antennas find wide applications in wireless communication systems. Typically, arrangements with uniform spacing between the array elements are applied to gain highly directive radiation patterns. In present paper an arrangement non-uniformly is synthesized multi-objective sense. The optimization relies on firefly algorithm and PEEC method.
Solving electromagnetic wave propagation problems with the finite-element method results in a large number of unknowns due to necessity modeling an extensive portion surroundings conducting structures. These equation systems are often ill-conditioned because great material differences as well changes size between neighboring elements. In addition, resulting matrices indefinite. Common iterative methods exhibit poor convergence these conditions. Direct solution techniques result high memory...