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Item type:Publication, Access status: without files , Terahertz spatial-harmonic magnetrons developmentThe spatial-harmonic magnetron (SHM) is a tube, which utilizes a spatial harmonic of the RF field of a non π-mode (usually the π/2-mode or a neighboring one) for its operation. An overview of the most important results towards the development of THz sources on the basis of SHMs is presented. Characteristics and design solutions of the already developed and produced 95 - 225 GHz magnetrons are presented. The current status of the development of 320 GHz magnetron is discussed as well.Publicationtype: Conference Paper57 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Microstrip ring resonator based frequency reconfigurable band-pass filters at K-band(2014-06); ; In this contribution two planar microstrip band-pass filters based on closed loop resonators with reconfigurable center frequency are proposed at K-band. Two geometries, a square-ring and a meander loop, are closely investigated. The frequency reconfigurability is achieved by means of PIN diodes. The filters are designed for and fabricated on a standard printed circuit board technology. Dual-mode resonators are used to obtain a compact design suitable for integration into an active antenna frontend. The paper presents the filter design, the tuning range, an analysis of the occurring losses, and the verification through simulation and measurement.Publicationtype: Conference Paper43 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , 61 GHz millimeter wave voltage variable attenuator based on flip-chip mounted PIN-diodes(2014-06); ; ; ; Voltage Variable Attenuators play a major role in radio frequency system design. In this paper, a voltage variable attenuator concept suitable for the 61GHz ISM band is introduced and discussed. The proposed reflection type voltage variable attenuator has a maximum attenuation of 32 dB in the 61 GHz ISM-band range, and a low phase-shift of less than 10°for low and medium attenuation values. Furthermore, a bias network is presented featuring low reflection loss, and robustness against manufacturing tolerances. For verification purposes, a voltage variable attenuator as well as a reference transmission line have been fabricated and measured.Publicationtype: Conference Paper82 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , K-band power amplifiers in a 100 nm GaN HEMT microstrip line MMIC technology(2014-06); ; This paper presents two power amplifier MMICs which are designed for operation at K-band (19 GHz). They are realized using a 100nm AlGaN/GaN HEMT technology which, in addition to coplanar lines, supports microstrip lines to cover the needs of applications between X- and Ka-band frequencies. The presented MMICs are among the first power amplifiers designed with the microstrip library and are used to evaluate the technology's performance at K-band. Both amplifiers are single-stage designs, where one uses only a single 8×75 μm HEMT cell and the other one uses two cells with power-combining. In large-signal measurements, the amplifiers reached, respectively, peak efficiencies of 36% and 38% associated with output powers of 0.93W and 1.48W and drain efficiencies of 61% and 51%.Publicationtype: Conference Paper64 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Accuracy enhancement of a split-ring resonator liquid sensor using dielectric resonator coupling(2014-06); ; Two planar resonant sensors for biomedical applications are compared with respect to their functionality when measuring high-loss materials. One sensor is a split-ring resonator. Liquid samples are placed at the gap where the conductor is shaped into tips. When sensing high-loss materials such as water this sensor type has a very low quality factor and therefore the evaluation of the resonance becomes inaccurate. To improve the quality factor, the second sensor uses a dielectric resonator as coupling element between the feed line and the split-ring resonator. Both sensors are tested on water and saline solutions. It is shown that the dielectric resonator drastically improves the quality factor of the sensing design and therefore enhances the accuracy of the sensor with respect to material characterization.Publicationtype: Conference Paper66 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Six-Port based direction finding and ranging(2014-06); The Six-Port concept is known since decades as a precise device for complex valued signal handling. It has shown its functionality for metrology applications as well as for broadband I/Q data reception. Due to its extraordinary phase resolution and low cost implementation two specific industrial applications get more and more into focus: Six-Port based distance measurements and direction finding. In this paper a review on this promising concept will be given for both, ranging and angle of incident detection featuring sub-millimeter range resolution and measurement value update rates in the two digit kilohertz range. Furthermore, similarities and differences of Six-Port technology with common radar concepts will be discussed.Publicationtype: Conference Paper47 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Concept and system analysis of wideband transmit front-ends for high data rate communication systems at W-band(2014-06); ; This paper presents the requirements to achieve data rates beyond 100 Gbit/s in communication systems operating at W-band. The analysis assumes the underlying transmitter system to be implemented as an active antenna array which supports beam steering and polarization multiplexing over large bandwidths to achieve the high data rates. The envisaged technologies for the transceiver front-ends are CMOS for the active circuitry and a stereolithographic process for the integration of the chip sets into active antenna elements. Application scenarios are presented, and a link budget analysis shows the feasibility of the concept for multi-user short-range line-of-sight communications. The required beam steering angles and ranges of operation are taken into account together with the necessary signal-to-noise ratio and modulation order to obtain the minimum number of array elements. Lastly, the frequency dependence of the link budget shows that the performance is limited at the lower W-band. Efforts for performance improvement should thus target this frequency range.Publicationtype: Conference Paper49 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Selftest strategies for microwave interferometry for high-precision industrial distance measurementsMicrowave interferometry is a tool for precisely measuring distances or vibrations of a target in industrial applications. Distance resolutions in the range of few micrometers and measurement value update rates of several tens of kilohertz are feasible. These parameters can only be achieved, if careful compensation of non-ideal effects is conducted. In this paper the basics of Six-Port based microwave interferometry as well as selftest techniques will be presented. Exemplarily, linearization of the operating point of the diode detectors and frequency estimation of the radar signal will be shown.Publicationtype: Conference Paper66