• Home
  • TU Wien
  • Institute of Electrodynamics, Microwave and Circuit Engineering
  • Holger Arthaber
Holger Arthaber

Holger Arthaber
TU Wien | TU Wien · Institute of Electrodynamics, Microwave and Circuit Engineering

Associate Professor

About

115
Publications
6,655
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
583
Citations

Publications

Publications (115)
Article
Full-text available
The localization of iot nodes in indoor scenarios with strong multipath channel components is challenging. All methods using radio signals, such as rss or aoa, are inherently prone to multipath fading. Especially for tof measurements, the low available transmit bandwidth of the used transceiver hardware is problematic. In our previous work on this...
Article
IC input characteristics are important parameters for proximity coupling (detect-weight,mode=text13.56) transponders. Modeled as voltage-dependent capacitor (Cic) and resistor (Ric) connected in parallel, they are typically measured using an LCR meter. In this work, we introduce a nonlinear, custom-defined circuit component (IC-component) based on...
Chapter
This paper focus on the registration of an aircraft to the L-Band Digital Aeronautical Communication System (LDACS). For this purpose, an Aircraft Station (AS) according to the LDACS standard [1] transmits an Random Access (RA) frame via one of two RA slots to an LDACS Ground Station (GS). Registration of an AS is typically required for two scenari...
Article
Full-text available
The intense use of the 2.4 GHz ISM band by several wireless technologies has resulted in increased co-channel interference between networks operating in this frequency band. The aim of this paper is to investigate modeling techniques of co-channel interference affecting bluetooth low energy devices. The models are derived from recorded interference...
Article
Full-text available
A novel basic antenna element for travelling‐wave substrate integrated waveguide (SIW) arrays is proposed in this study. The antenna element is based on a transverse slot and newly complemented by a pair of vias used for matching and a phase shifter. By changing the geometries of the slot and the phase shifter, the amplitude and phase of a radiated...
Article
Being nonlinear dynamic systems, magnetic read sensors should respond to an excitation signal of a frequency considerably different from their natural ferromagnetic resonance (FMR) frequencies. Because of the magnetization dynamics’ inherent nonlinear nature, the sensors’ response should be measured at the dc, excitation frequency, and its multiple...
Article
Full-text available
A method for measuring the resonance frequency of contactless chip cards is proposed in this article. Compared to the vector network analyzer (VNA) based state‐of‐the‐art method, the method gives a more accurate definition of resonance frequency, removes the subjectivity associated with the state‐of‐the‐art method, and makes the measurement integra...
Article
Measurement-based black box behavioral models are widely used nowadays. To handle nonlinear effects efficiently, such models often rely on approximation techniques. Polyharmonic distortion (PHD) modeling emerged as a viable approach for describing a nonlinear mapping. Typical PHD-based models, such as the well-known X-parameter model, are gained fr...
Preprint
Full-text available
Being nonlinear dynamic systems, magnetic read sensors should respond to an excitation signal of a frequency considerably different from their natural ferromagnetic resonance (FMR) frequencies. Because of the magnetization dynamics' inherent nonlinear nature, the sensors' response should be measured at the DC, excitation frequency, and its multiple...
Article
Full-text available
Die VA Erzberg GmbH hat im Laufe der letzten Jahre am Steirischen Erzberg ein Fahrzeugtelemetriesystem aufgebaut, welches Informationen zu spezifischen Kennwerten der Tagbaufahrzeuge sowie qualitative Parameter der bereits gesprengten Abschläge visualisiert und miteinander kombiniert. Damit kann der Produktionsverantwortliche bereits im Tagbau eine...
Article
Full-text available
The scope of this work is to discuss the challenges and demonstrate the potential of microwave testing for applications in the wood processing industry. Microwave technology benefits from the anisotropic dielectric properties of wood to simultaneously identify grain angle, density, and moisture content of wood. Therefore, the theory of free space t...
Article
This paper introduces a method for determining the attenuation constant and the dielectric permittivity (Dk) by microstrip lines and/or conductor-backed coplanar waveguides. The method considers several effects (surface waves, frequency-dependent conductance, inductance, and resistance) for obtaining the attenuation constant of the line and the Dk...
Article
This paper presents measurement results of a recently introduced time of flight (ToF) ranging method for backscattering radio frequency identification (RFID) tags. The measurements are done with off-the-shelf EPC Class1 Gen2 tags, an automated tag positioner, a modified software defined radio (SDR) platform as RFID reader, and a PC post-processing...
Article
Full-text available
The accuracy of time-of-flight based ranging over UHF RFID backscatter channels is fundamentally limited by the available bandwidth and highly dependent on the channel characteristics. Comprehensive wideband channel measurements are presented and analyzed with respect to parameters which influence the potential ranging performance. The Cramér Rao l...
Patent
A method for estimating the projection on a reference plane (XZ) perpendicular to a first face (2) of a plank (1), of the direction of extension of the fibres (L) comprising the steps of: emitting a first and a second polarized microwave beam towards the plank (1) according to a first and second directions of incidence lying in a first and second p...
Article
We propose a new measurement technique to characterize ferromagnetic resonance (FMR) modes in magnetic tunnel junctions (MTJs). Due to selectivity and low-noise characteristics of the utilized radio-frequency (RF) receiver, which is often used in spectrum analyzers, we achieve large dynamic range FMR measurements. Instead of relying on weak couplin...
Conference Paper
Full-text available
Positioning and ranging within UHF RFID are highly dependent on the channel characteristics. The accuracy of time-of-flight based ranging systems is fundamentally limited by the available bandwidth. This paper first analyzes the UHF RFID backscatter channel formed by convolution of the individual constituent channels. For this purpose, we present c...
Conference Paper
This paper presents measurement results of a recently introduced time of flight (ToF) ranging method for backscattering RFID tags. The measurements are done with offthe-shelf EPC Class1 Gen2 tags, an automated tag positioner,a modified software defined radio (SDR) platform as the RFID reader, and a PC post-processing the ranging results. The rangin...
Article
A tapered slot antenna element capable of reconfiguring its beam direction is presented. As the basic element, a Vivaldi antenna fed by a substrate integrated waveguide is chosen. The Vivaldi antenna is complemented by a parasitic planar array of small metallic patches placed in front of its aperture and by corrugated edges of the Vivaldi antenna's...
Conference Paper
All-digital radio frequency transmitters (DRFTx) offer many potential benefits for future RF applications. However, their design requires the use of nonlinear models that can describe the memory induced, nonlinear behavior of these circuits. The model needs to cover a huge bandwidth and incorporate the behavior of the digital-analog-converter withi...
Conference Paper
Load dependent X-parameter models offer an accurate description of nonlinear devices, especially in mismatched environments. However, the model prediction is ambiguous in many cases, because the model contains X-parameter sets on a predefined load pull grid. Hence, the prediction of the model is strongly dependent on its implementation and the unde...
Conference Paper
The MgO-based magnetic tunnel junction (MTJ) is the basis of modern hard disk drives' magnetic read sensors. Within its operating bandwidth, the sensor's performance is significantly affected by nonlinear and oscillating behavior arising from the MTJ's magnetization dynamics at microwave frequencies. Static I-V curve measurements are commonly used...
Article
Transmitters based on nonlinear radio-frequency (RF) modulators and switched-mode power amplifiers are systems that, at least theoretically, can provide high linearity and energy-efficient generation of RF signals at the same time. However, the nonlinear memory-affected behavior remains an issue hindering practical applications. This paper shows th...
Article
A substrate integrated waveguide (SIW) offset parabolic antenna is proposed in this letter. The antenna consists of four main parts: a feeder with a horn radiator, a parabolic reflector, parallel plate metal blocks, and a dielectric load. The configuration of the horn and parabolic reflector is based on the parabolic reflector principle. The parall...
Article
In this letter, a novel concept of a high-gain Vivaldi antenna operating in the $K_{a}$ frequency band is proposed. The antenna is fed by the substrate integrated waveguide. The concept overcomes shortcomings of conventional antipodal Vivaldi antenna using dielectric load with printed metal transition and transverse ripples. The added parts are opt...
Conference Paper
Recent developments in the field of wireless communications emphasis the urgent need for flexible radio frequency (RF) front ends. Not only a multitude of frequency bands needs to be supported, also modulation formats come in a greater variety and tend to develop at a faster pace. While receiver topologies have been adapted by employing software de...
Conference Paper
As surface finishe play allegedly a crucial role in the overall performance of RF-circuits, this paper is dedicated to evaluate the impact of four different platings, as well as plain copper, on insertion loss for commercially manufactured RF-PCBs. The selected surface finishe are Electroless Nickel Immersion Gold (ENIG), Electroless Nickel Electro...
Conference Paper
Low temperature co-fired ceramics (LTCC) have shown to be one of the most admirable materials in high-frequency components design ([1], [2]). Low dielectric losses and the applicability of highly conductive materials are making them desirable in production of high quality passive components, most often capacitors and inductors. These are the reason...
Article
Full-text available
In this paper an equivalent complex baseband representation of the analog component related non-linearity of digital transmitters relying on 1-bit complex baseband encoding is derived. By exploiting the properties of the pulsed RF encoding the novel behavioral modeling technique is able to represent accurately the non-linear memory effects of the p...
Article
Full-text available
This letter introduces a ranging method which can be applied to off-the-shelf backscatter RFID tags, like standardized EPC Gen 2 tags. For this purpose a low power direct sequence spread spectrum (DSSS) sequence is superimposed onto the interrogator's signal during tag to reader communication. The chip rate and sequence length is chosen to fit an e...
Conference Paper
A flexible UHF EPC RFID testbed based on an offthe- shelf software defined radio, i.e. the National Instruments USRP-2922, will be presented in this paper. The testbed will be used to develop a real-time localization system which uses an overlaid direct sequence-spread spectrum signal. Since the localization algorithm is intended to use low power s...
Conference Paper
A technology push towards digital radio frequency (RF) transmitters (DRFTx) is all apparent due to the many beneficial properties they offer. However, their distortion mechanisms pose a challenging problem for practical realizations. To a significant extend this is caused by the nature of the excitation signal. DRFTx are driven by a binary signal w...
Conference Paper
This paper addresses the issues related probing radio frequency (RF) waveforms in nonlinear circuits. Having access to time domain waveforms is essential when developing nonlinear circuits. However, in many cases these signals are not easy accessible which urge the need for some kind of coupler integrated onto the printed circuit board (PCB). Defin...
Conference Paper
This paper addresses linearity issues of pulse drivers for the use in class-S power amplifiers. Nonlinear effects introduce unwanted signal components, however, pulse drivers are usually designed to be driven into saturation. Hence, it is a challenging but often necessary task to characterize and model these nonlinear effects especially in an early...
Conference Paper
This paper focuses on the description of loss behavior up to 110 GHz for two commercially widely used transmission line modes, microstrip (MS) and conductor backed coplanar waveguide (CBCPW). Within this investigation special attention has been drawn to the applied manufacturing processes as each process has distinct tolerances and etching behavior...
Conference Paper
This paper presents the design and evaluation of a flexible UHF RFID testbed, which is intended to be used for developing real time localization systems. It is based on an off the shelf software defined radio platform, i.e. the National Instruments USRP-2922. Special requirements for a localization algorithm based on a superimposed Direct Sequence-...
Conference Paper
This paper outlines a design concept of a PWM driven switched mode power amplifier (SMPA) with direct filter connect, making up all circuitry necessary for an energy efficient digital RF transmitter. For the output matching network design the simplified real frequency technique (SRFT) has been extended in a way to achieve high output power in signa...
Conference Paper
We demonstrate an amplification of broadband terahertz pulses in the bandwidth of 500 GHz centered at 2.5 THz. The amplification is based on gain switched quantum cascade structure width the heterogeneous active region.
Conference Paper
This work outlines the design and construction of a continuous mode Class F amplifier using harmonic load pull measurements. To overcome the limits implied by the load pull setup a custom prematch was designed. With this design methodology an amplifier can be build without prior knowledge of the used device's behavior. To design the prematch and th...
Conference Paper
In this paper a lookup table (LUT) based model, suitable for describing the nonlinear behavior of digital radio frequency (RF) power amplifiers (PA), is introduced. Futhermore, the LUT model is compared to nonlinear auto-regressive (ARX) models with respect to performance and computational complexity. This is accomplished by modeling a digital RF t...
Article
We demonstrate a broadband terahertz amplifier based on ultrafast gain switching in a quantum cascade laser. A heterogeneous active region is processed into a coupled cavity metal-metal waveguide device and provides broadband terahertz gain that allows achieving an amplification bandwidth of more than 500 GHz. The temporal and spectral evolution of...
Conference Paper
In this paper a methodology for identifying broadband nonlinear models for digital switched mode RF power amplifiers is presented. This can be accomplished by training a black box model by observing an amplifier's output waveform in time domain. It is demonstrated that the presented method is feasible for using a simple and relatively short excitat...
Article
Full-text available
Prediction of basic timber properties like moisture content and density is an important factor for quality control in timber industry. This paper deals with the detection of moisture content and density of spruce (Picea abies). It describes the calibration and validation of the newly developed microwave prototype on the basis of 480 measurements fo...
Article
Full-text available
The digital generation of pulsed radio frequency (RF) signals based on noise shaped encoding in complex baseband is a popular concept in digital RF transmitters. However, as the pulsed complex-baseband signals are up-converted to an RF frequency, a conjugate image overlaps with the signal band, which complicates the center frequency tuning for the...
Conference Paper
Full-text available
In this work a novel time delay neural network based complex baseband model is proposed for fully digital pulse driven power amplifier concepts. It will be shown that the given technique is able to capture the non-linear effects related to the analog components of the transmitter. Results based on simulations and measurements indicate an accurate m...
Conference Paper
This paper focuses on the evaluation of pulse drivers for the use in class-S power amplifier setups with respect to linearity. Nonlinear effects are likely to degrade the overall system performance, though they are hard to characterize especially in an early stage of design. Based on measurements conducted with a configurable pulse driver, namely T...
Conference Paper
A conductive passive structure for miniature RFID tags is manufactured with a europractice MetalMUMPS technology. The antennas are co-located with a micro mechanical temperature sensor manufactured on the same silicon chip. The envisioned application of this RFID tag is monitoring of the cooling chain for transport logistics. The necessary design s...
Article
Non-destructive evaluation of the physical properties of wood is a key task in modern wood manufacturing processes. Due to a rapidly increasing production speed, fast, non-contacting, reliable and robust measurement systems are demanded by the wood industry. Common moisture meters are able to reasonably cope with industrial needs. However, modern d...
Conference Paper
Quadrature type pulsed radio frequency (RF) signal encoding combined with class-S switched-mode power amplification (SMPA) constitute a potential solution for high efficiency RF transmitters. However, the digital center frequency adjustment for such encoding methods is limited by quantization noise folding. In this paper, a novel quantization noise...
Article
An important aspect in machine strength grading of timber is the direction of the grain and deviations from the main axis, which can cause a dramatic loss of strength. Therefore, an essential requirement of the wood industry is to find the direction of wood fibres in a fast and non-invasive way. For three decades now the use of polarised microwave...
Article
State-of-the-art quadrature-type modulators for all-digital radio-frequency (RF) transmitters operate optimally at an RF center frequency (fc) that is a fraction of the modulator switching rate. This is a major limitation if the modulators of this type are to be used in multichannel transmitter systems. In this brief, a novel quadrature modulator b...
Conference Paper
In this paper the performance of a digital quadrature PWM modulator for switched-mode wideband transmitters is evaluated. The purpose of the evaluation is to analyze the impact of the modulator parameter settings on the signal band quantization noise and on the average power efficiency of the complete digital transmitter. Considering a realistic se...