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ISSN 1868-4696
Diese Arbeit beschreibt den neuartigen Einsatz von breitbandigen kontinuierlichen Frequenzweichen für die Parallelisierung von Millimeterwellen-On-Wafer-Messtechnik durch die Integration in On-Wafer-Messspitzen. Eine modellbasierte Methode für den effizienten Entwurf von Frequenzweichen mit einer Vielzahl einstellbarer Parameter ermöglicht die erstmalige Realisierung einer DC – 110 GHz – 170 GHz Frequenzweiche.
This work describes the novel use of broadband continuous diplexers that could be integrated into on-wafer probes to parallize millimeter wave on-wafer measurement equipment. A model-based method for the efficient design of diplexers with a large number of adjustable parameters allows the realization of a DC – 110 GHz – 170 GHz diplexer for the first time.
Umfang: XIII, 183 S.
Preis: 46.00 €
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Ein effizientes Frequenzmanagement ist essentiell, um dem Bedarf an interferenzfreier Funkkommunikation gerecht zu werden. In diesem Zusammenhang wird das Konzept eines automatischen Spektrum-Monitoring-Systems vorgestellt, welches die lokale spektrale Effizienz ermittelt. Hierzu wird in einem neuartigen Ansatz eine multiple Parameterschätzung zur Funksignalidentifikation realisiert. Zudem werden neue Verfahren in der automatischen Kanalsegmentierung und Modulationsartenerkennung eingeführt.
An efficient spectrum management is the key for interference-free wireless communication. The automated spectrum monitoring system presented in this thesis detects and identifies improper use of the RF spectrum. The introduced algorithm can measure the local spectral efficiency and allows a better RF spectrum management in the future. Additionally new algorithms for automated channel segmentation and modulation classification are implemented and evaluated in typical RF monitoring scenarios.
Umfang: XXIII, 256 S.
Preis: €49.00 | £45.00 | $86.00
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This work presents a design methodology for pattern reconfigurable antennas in automotive applications. Channel simulation is used to identify the relevant beam directions prior to the design of the antenna. Based on this knowledge several reconfigurable multiple antenna systems are designed. These antennas are evaluated by the channel capacity calculation from virtual and real-world test drives. An increase of the channel capacity by a factor of 2 compared to a conventional system is observed.
Umfang: XVIII, 146 S.
Preis: €41.00 | £38.00 | $72.00
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This work explores short-range millimeter wave radar systems, with emphasis on miniaturization and overall system cost reduction. The designing and implementation processes, starting from the system level design considerations and characterization of the individual components to final implementation of the proposed architecture are described briefly. Several D-band radar systems are developed and their functionality and performances are demonstrated.
Umfang: XI, 145 S.
Preis: €42.00 | £39.00 | $74.00
Buchdetails
In dieser Arbeit werden Methoden zur Erzeugung von TE₀- und TM₀-Oberflächenwellen für die Anwendung in mmW-Leckwellenantennen nach dem holografischen Prinzip vorgestellt und untersucht. Ziel ist dabei, die Integrierbarkeit der Oberflächenwellenerzeuger in mmW-Systeme zu vereinfachen und gleichzeitig die Abstrahleigenschaften der Leckwellenantennen zu verbessern.
In this work new methods for the generation of TE₀ and TM₀ surface waves for mmW leaky wave antennas using the holographic principle are presented and evaluated. The main goal is to simplify the integrability of the surface wave launcher into mmW systems and at the same time improve the radiation characteristics of the leaky wave antenna.
Umfang: XII, 170 S.
Preis: €39.00 | £36.00 | $69.00
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This work presents a low temperature co-fired ceramic (LTCC) technology based system-in-package (SiP) operating beyond 100 GHz. The SiP encloses a semiconductor transceiver chip in a pea-sized LTCC package. The SiP is efficient and robust in terms of its electrical, thermal and mechanical characteristics. Moreover, it is low-cost and requires only standard manufacturing and assembly techniques. Finally, two fully-integrated 122 GHz radar sensors are demonstrated in LTCC technology.
Umfang: XVIII, 215 S.
Preis: €47.00 | £43.00 | $83.00
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Die vorliegende Arbeit beschäftigt sich mit der Entwicklung von Breitbandverstärkern mit einstellbarem Gewinn. Es werden verschiedene Schaltungskonzepte zur Einstellung des Verstärkergewinns untersucht, und sowohl kompakte als auch verteilte Verstärkerschaltungen in SiGe BiCMOS Technologien hergestellt. Ein weiterer Schwerpunkt der Arbeit ist die Modellierung von verteilten Verstärkern mithilfe von Bildparametern, die eine analytische und kompakte Beschreibung ermöglichen.
The present work deals with the development of broadband amplifiers with adjustable gain. Different circuit topologies for gain control are investigated, and several compact and distributed amplifiers are fabricated in SiGe BiCMOS technologies. Another key aspect of the work is the modeling of distributed amplifiers by means of image parameters, which enable an analytical and compact description.
Umfang: XII, 156 S.
Preis: €42.00 | £39.00 | $74.00
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Current automotive radar sensors prove to be a weather robust and low-cost solution, but are suffering from low resolution and are not capable of classifying detected targets. However, for future applications like autonomous driving, such features are becoming ever increasingly important. On the basis of successful state-of-the-art applications, this work presents the first in-depth analysis and ground-breaking, novel results of polarimetric millimeter wave radars for automotive applications.
Umfang: IX, 159 S.
Preis: €45.00 | £41.00 | $79.00
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Measurement at millimeter-wave frequencies are prone to parasitic effects which distort the overall results. Especially the use of RF probes introduces unknown distortions, even after the measurement setup is calibrated. This works investigates these distortions based on electromagnetic field simulations of integrated circuits in conjunction with models of the used RF probes. This allows to comprehend the observed distortions and successfully resolve the root of the distortions.
Umfang: XII, 180 S.
Preis: €46.00 | £42.00 | $81.00
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Die vorliegende Arbeit beschreibt ein Konzept zur Optimierung mobiler Antennensysteme. Die sogenannte Antennensynthese bestimmt mithilfe von simulierten oder gemessenen Übertragungskanälen optimale feste Richtcharakteristiken. Diese steigern die spektrale Effizienz und die Zuverlässigkeit des Antennensystems gegenüber herkömmlichen Antennen mit omnidirektionalen Richtcharakteristiken. Hierfür werden die Antennensysteme bestmöglich an die Vorzugsrichtungen des Kanals angepasst.
This work describes an optimization concept for mobile antenna systems. The so-called antenna synthesis determines optimal fixed antenna radiation patterns with the help of simulated or measured transmission channels. These radiation patterns increase the spectral efficiency and the reliability of the antenna system compared to conventional antennas with omnidirectional radiation patterns. Therefor the antenna systems are matched as best as possible to the predominant directions of the channel.
Umfang: xviii, 183 S.
Preis: €41.00 | £38.00 | $72.00
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