IEEE Transactions on Microwave Theory and Techniques, 1988
ABSTRACT A hybrid oscillator at 1.9805 GHz using acoustic surface transverse wave (STW) delay lin... more ABSTRACT A hybrid oscillator at 1.9805 GHz using acoustic surface transverse wave (STW) delay lines operating at the third harmonic as the frequency controlling element is discussed. The STW delay lines were fabricated on 37.5°-rotated Y-cut quartz substrates with a photolithographic technique. A very thin metallization (25 nm) was used to obtain low insertion loss. A split isolated electrode design was used for the transducers. The Q -value and the untuned insertion loss of the STW filter were 3400 and 21 dB, respectively. The phase noise and temperature stability of the oscillator were characterized. At a power output of 6.5 dBm a single-sideband phase noise-to-carrier ratio of -100 dBc/Hz at 1 kHz was attained
Stochastic electromagnetic fields can be described by correlation spectra. In this paper, we desc... more Stochastic electromagnetic fields can be described by correlation spectra. In this paper, we describe modeling of the aperture field for a cavity with multiple stochastic sources for field excitation within the cavity with an arbitrary degree of correlation between the sources. In this modeling approach, the contribution to the aperture field from each radiation source is characterized experimentally and numerically by determining $S$-parameters first. Variable degree of source correlation can have a significant impact on the aperture field
A wireless power transfer system for roadway powered electric vehicles (EVs) is presented. The sy... more A wireless power transfer system for roadway powered electric vehicles (EVs) is presented. The system concept is using inductive coupling of primary coils arranged in a linear array in the roadway to secondary coils in each EV. The system is geared to minimize loss of the stored energy in the primary coils and compensation capacitors by passing the energy on to the subsequent coil and capacitor of the linear array. The inductive power transfer (IPT) system is operated as a switched resonant inverter controlled by the primary and secondary coil currents. By this way power transfer in both directions can be accomplished. We describe an extension of the moving field inductive power transfer (MFIPT) system by introducing a synchronous switched DC-DC converter. A rectangular AC power supply voltage is provided by a switched inverter from the underroad DC power supply. An automatic switching adapts to load changes and switches in optimum phase. Also the analysis of a basic IPT cell is dis...
The realization of flat superlenses is a major application area of metamaterials. A slab of doubl... more The realization of flat superlenses is a major application area of metamaterials. A slab of double negative (DNG) material is capable of imaging with a resolution beyond the diffraction limit. The focusing quality depends primarily on the amount by which the original wavenumber spectrum of the source is restored behind the lens. Even a small deviation from the ideal case ofr = μr = -1 limits the wavenumber spectrum of the transmitted field, which may result in a significant degradation of the focusing quality. In this work we determine the width of the trans- mitted wavenumber spectrum as a function of the configuration parameters and establish a relation between the spectrum width and the imaging quality. Restrictions imposed on the focusing char- acteristics and difficulties arising in full wave simulations will be pointed out. As a consequence of negative refraction, a slab with finite thickness d and material parameters � r = μr = -1 (refractive index n = √ � rμr = -1) focuses w...
Time-domain as well as frequency domain adaptive filter algorithms have been investigated and com... more Time-domain as well as frequency domain adaptive filter algorithms have been investigated and compared in respect of their capabilities of suppressing ambient noise during time-domain measurements of electromagnetic interference at open test sites. The fundamentals and the application of the most advantageous algorithm for timedomain EMI measurements is described in this paper. An advanced digital signal processing technique for fast measurements of electromagnetic interference from electronic devices is presented. Measurements of electromagnetic interference of a device under test can be performed in a test site polluted by electromagnetic ambient noise by using digital signal processing. Frequency domain adaptive filtering using the overlap-save method is applied and measurement results of a real device under test are carried out showing the successful cancelation of ambient noise at an urban test site in a broad frequency range up to 1000 MHz.
Measurement equipment that allows to measure electromagnetic interference (EMI) in short measurem... more Measurement equipment that allows to measure electromagnetic interference (EMI) in short measurement time allows to reduce the costs and the time-to-market. By a timedomain EMI (TDEMI) measurement the measurement time can be reduced by several orders of magnitude. In the following a novel trigger unit and recording algorithm for a TDEMI measurement system is described. The trigger unit triggers on signal parts that have a maximum amplitude between a certain preselected interval. The maximum detector unit allows to measure and store the maximum amplitude of the signal within a preselected time interval. The maxima of consecutive time intervals are stored. The signal is processed in real-time for several seconds. Recorded signal parts are assigned according to their maximum amplitude to a certain point in time. The original signal is reconstructed. A time-dependent spectrum for several seconds is calculated. The signal corresponding to the envelope of the IF-signal of an EMI Receiver ...
In this paper an e fficient systematic design and optimization approach for cyli ndrical conforma... more In this paper an e fficient systematic design and optimization approach for cyli ndrical conformal antennas is presented. The approach is based on Integral Equation Method (IEM) in co nnection with Method of Moment (MoM). The dyadic Green’s function is computed in Spectral Domain ( SD) in aGeneralized Transmission Line (GTL) model of the spectral domain representation of the dyadic Green’s fu ction [10]. The current density distribution is compute d by method of moment in SD as described in [8]. The Space Domain (SPD) representation of the dyadic Green’s fu ction is obtain using theGeneralized Pencil of Functionmethod (GPOF) [7, 6, 3]. To demonstrate the power of the method, a systematic beam-sh ping technique is introduced. Using an asymptotic approximation for obtaining the radiation characteristic , we show that a beam-shaping optimization can be done e fficiently and systematically based on network concepts. As an example a conformal dipole antenna embedded in the multilayered c...
The representation of electromagnetic structures by lumped element circuits is revisited. Net- wo... more The representation of electromagnetic structures by lumped element circuits is revisited. Net- work models can be established by a subsequent ap- plication of system identification and circuit synthesis methods to data obtained by numerical simulation or from measurement. Network models provide a com- pact description of electromagnetic structures and can contribute significantly to the formulation of electro- magnetic field problems and their efficient solution. On the field level network methods are introduced by seg- mentation of the electromagnetic structures and appli- cation of the field form of Tellegen's theorem. Methods for synthesis of lumped element models for lossless as well as lossy linear reciprocal multiports and for ra- diating structures are discussed. The state equation method as a general framework for lumped element network description is presented. Discrete time repre- sentations on the basis of Richards transformation and wave digital filter formulation ar...
Within the next decade intelligent millimeterwave radar systems for vehicular sensor applications... more Within the next decade intelligent millimeterwave radar systems for vehicular sensor applications in the frequency band from 77 GHz to 81 GHz will be developed in Germany. State of the art in passive and active components of monolithic integrated silicon millimeterwave systems is discussed and the data of already realized components are presented.
The European Conference on Wireless Technology, 2005.
In this paper, an advanced ultra-fast broadband time-domain EMI (TDEMI) measurement system based ... more In this paper, an advanced ultra-fast broadband time-domain EMI (TDEMI) measurement system based on a multi-level analog-to-digital converter (ADC) is presented. The proposed multi-level quantization system is compared with a single ADC system. The multi-level system is modelled and investigated experimentally in the 30-1000 MHz frequency range. Measurement results and the results of computer simulations are compared. Utilizing digital signal
Electromagnetics and Network Theory and their Microwave Technology Applications, 2011
In recent years, modal techniques have been successfully improved and are increasingly used for d... more In recent years, modal techniques have been successfully improved and are increasingly used for dealing with design of waveguide discontinuities and passive components [1, 2, 3, 4, 5, 6, 7, 8], due to their efficiency and also because they provide rigorous and useful network representations. One distinguished characteristic of modal techniques is to separate the transverse field behavior from the longitudinal one; this decoupling makes it feasible to consider electromagnetic wave propagation inside a waveguide as a superposition of transmission lines (each pertaining to a mode) which couple only at discontinuities. Electromagnetic field representation inside a waveguide with finite cross-section, is therefore achieved by a discrete summation of the relevant waveguide modes.
IEEE Transactions on Microwave Theory and Techniques, 1988
ABSTRACT A hybrid oscillator at 1.9805 GHz using acoustic surface transverse wave (STW) delay lin... more ABSTRACT A hybrid oscillator at 1.9805 GHz using acoustic surface transverse wave (STW) delay lines operating at the third harmonic as the frequency controlling element is discussed. The STW delay lines were fabricated on 37.5°-rotated Y-cut quartz substrates with a photolithographic technique. A very thin metallization (25 nm) was used to obtain low insertion loss. A split isolated electrode design was used for the transducers. The Q -value and the untuned insertion loss of the STW filter were 3400 and 21 dB, respectively. The phase noise and temperature stability of the oscillator were characterized. At a power output of 6.5 dBm a single-sideband phase noise-to-carrier ratio of -100 dBc/Hz at 1 kHz was attained
Stochastic electromagnetic fields can be described by correlation spectra. In this paper, we desc... more Stochastic electromagnetic fields can be described by correlation spectra. In this paper, we describe modeling of the aperture field for a cavity with multiple stochastic sources for field excitation within the cavity with an arbitrary degree of correlation between the sources. In this modeling approach, the contribution to the aperture field from each radiation source is characterized experimentally and numerically by determining $S$-parameters first. Variable degree of source correlation can have a significant impact on the aperture field
A wireless power transfer system for roadway powered electric vehicles (EVs) is presented. The sy... more A wireless power transfer system for roadway powered electric vehicles (EVs) is presented. The system concept is using inductive coupling of primary coils arranged in a linear array in the roadway to secondary coils in each EV. The system is geared to minimize loss of the stored energy in the primary coils and compensation capacitors by passing the energy on to the subsequent coil and capacitor of the linear array. The inductive power transfer (IPT) system is operated as a switched resonant inverter controlled by the primary and secondary coil currents. By this way power transfer in both directions can be accomplished. We describe an extension of the moving field inductive power transfer (MFIPT) system by introducing a synchronous switched DC-DC converter. A rectangular AC power supply voltage is provided by a switched inverter from the underroad DC power supply. An automatic switching adapts to load changes and switches in optimum phase. Also the analysis of a basic IPT cell is dis...
The realization of flat superlenses is a major application area of metamaterials. A slab of doubl... more The realization of flat superlenses is a major application area of metamaterials. A slab of double negative (DNG) material is capable of imaging with a resolution beyond the diffraction limit. The focusing quality depends primarily on the amount by which the original wavenumber spectrum of the source is restored behind the lens. Even a small deviation from the ideal case ofr = μr = -1 limits the wavenumber spectrum of the transmitted field, which may result in a significant degradation of the focusing quality. In this work we determine the width of the trans- mitted wavenumber spectrum as a function of the configuration parameters and establish a relation between the spectrum width and the imaging quality. Restrictions imposed on the focusing char- acteristics and difficulties arising in full wave simulations will be pointed out. As a consequence of negative refraction, a slab with finite thickness d and material parameters � r = μr = -1 (refractive index n = √ � rμr = -1) focuses w...
Time-domain as well as frequency domain adaptive filter algorithms have been investigated and com... more Time-domain as well as frequency domain adaptive filter algorithms have been investigated and compared in respect of their capabilities of suppressing ambient noise during time-domain measurements of electromagnetic interference at open test sites. The fundamentals and the application of the most advantageous algorithm for timedomain EMI measurements is described in this paper. An advanced digital signal processing technique for fast measurements of electromagnetic interference from electronic devices is presented. Measurements of electromagnetic interference of a device under test can be performed in a test site polluted by electromagnetic ambient noise by using digital signal processing. Frequency domain adaptive filtering using the overlap-save method is applied and measurement results of a real device under test are carried out showing the successful cancelation of ambient noise at an urban test site in a broad frequency range up to 1000 MHz.
Measurement equipment that allows to measure electromagnetic interference (EMI) in short measurem... more Measurement equipment that allows to measure electromagnetic interference (EMI) in short measurement time allows to reduce the costs and the time-to-market. By a timedomain EMI (TDEMI) measurement the measurement time can be reduced by several orders of magnitude. In the following a novel trigger unit and recording algorithm for a TDEMI measurement system is described. The trigger unit triggers on signal parts that have a maximum amplitude between a certain preselected interval. The maximum detector unit allows to measure and store the maximum amplitude of the signal within a preselected time interval. The maxima of consecutive time intervals are stored. The signal is processed in real-time for several seconds. Recorded signal parts are assigned according to their maximum amplitude to a certain point in time. The original signal is reconstructed. A time-dependent spectrum for several seconds is calculated. The signal corresponding to the envelope of the IF-signal of an EMI Receiver ...
In this paper an e fficient systematic design and optimization approach for cyli ndrical conforma... more In this paper an e fficient systematic design and optimization approach for cyli ndrical conformal antennas is presented. The approach is based on Integral Equation Method (IEM) in co nnection with Method of Moment (MoM). The dyadic Green’s function is computed in Spectral Domain ( SD) in aGeneralized Transmission Line (GTL) model of the spectral domain representation of the dyadic Green’s fu ction [10]. The current density distribution is compute d by method of moment in SD as described in [8]. The Space Domain (SPD) representation of the dyadic Green’s fu ction is obtain using theGeneralized Pencil of Functionmethod (GPOF) [7, 6, 3]. To demonstrate the power of the method, a systematic beam-sh ping technique is introduced. Using an asymptotic approximation for obtaining the radiation characteristic , we show that a beam-shaping optimization can be done e fficiently and systematically based on network concepts. As an example a conformal dipole antenna embedded in the multilayered c...
The representation of electromagnetic structures by lumped element circuits is revisited. Net- wo... more The representation of electromagnetic structures by lumped element circuits is revisited. Net- work models can be established by a subsequent ap- plication of system identification and circuit synthesis methods to data obtained by numerical simulation or from measurement. Network models provide a com- pact description of electromagnetic structures and can contribute significantly to the formulation of electro- magnetic field problems and their efficient solution. On the field level network methods are introduced by seg- mentation of the electromagnetic structures and appli- cation of the field form of Tellegen's theorem. Methods for synthesis of lumped element models for lossless as well as lossy linear reciprocal multiports and for ra- diating structures are discussed. The state equation method as a general framework for lumped element network description is presented. Discrete time repre- sentations on the basis of Richards transformation and wave digital filter formulation ar...
Within the next decade intelligent millimeterwave radar systems for vehicular sensor applications... more Within the next decade intelligent millimeterwave radar systems for vehicular sensor applications in the frequency band from 77 GHz to 81 GHz will be developed in Germany. State of the art in passive and active components of monolithic integrated silicon millimeterwave systems is discussed and the data of already realized components are presented.
The European Conference on Wireless Technology, 2005.
In this paper, an advanced ultra-fast broadband time-domain EMI (TDEMI) measurement system based ... more In this paper, an advanced ultra-fast broadband time-domain EMI (TDEMI) measurement system based on a multi-level analog-to-digital converter (ADC) is presented. The proposed multi-level quantization system is compared with a single ADC system. The multi-level system is modelled and investigated experimentally in the 30-1000 MHz frequency range. Measurement results and the results of computer simulations are compared. Utilizing digital signal
Electromagnetics and Network Theory and their Microwave Technology Applications, 2011
In recent years, modal techniques have been successfully improved and are increasingly used for d... more In recent years, modal techniques have been successfully improved and are increasingly used for dealing with design of waveguide discontinuities and passive components [1, 2, 3, 4, 5, 6, 7, 8], due to their efficiency and also because they provide rigorous and useful network representations. One distinguished characteristic of modal techniques is to separate the transverse field behavior from the longitudinal one; this decoupling makes it feasible to consider electromagnetic wave propagation inside a waveguide as a superposition of transmission lines (each pertaining to a mode) which couple only at discontinuities. Electromagnetic field representation inside a waveguide with finite cross-section, is therefore achieved by a discrete summation of the relevant waveguide modes.
Uploads
Papers by Peter Russer