The objectives of this research lie in the area of millimeter and submillimeter wave signal generation and are directed into two paths that are separate, but related. The first involves the development of a W-Band oscillator using Raytheon's Metamorphic High Electron Mobility Transistor (MHEMT) substrate. The second involves the development of silicon formed rectangular waveguide to replace metallic waveguide, ultimately to be used in THz signal source circuits. An exploration of two different topologies for a W-Band oscillator design utilizing Raytheon s MHEMT substrate is presented. This material will demonstrate the reasoning behind the topology selection and the approach of the design. An evaluation of this first ever W-Band MHEMT oscillator will be presented demonstrating its performance capabilities. Finally, an oscillator design will be presented extending the first successful MHEMT W-Band design. The area of Silicon rectangular waveguide with is covered. A design approach of the silicon waveguide will be discussed. The technology used to fabricate and package the silicon waveguide will be explained. The results of the very first 400 GHz silicon waveguide will be shown and the future efforts will be covered. A silicon micromachined waveguide multiplier using an HBV diode circuit is constructed and successfully demonstrated with an output frequency of 261 GHz, showing little difference between using micromachined waveguide and metal waveguide. Lastly, a power combining frequency multiplier is developed utilizing HBV diodes with an output of 260 GHz. The input and output sections are created using branch line couplers. The results showed good power generation as compared to a single diode multiplier.

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Thesis (doctoral)--Helsinki University of Technology, 2009. / Includes bibliographical references. Also available on the World Wide Web.

Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2005. / Dr. Waymond R. Scott, Committee Member ; Dr. Aaron Lanterman, Committee Member ; Dr. Paul G. Steffes, Committee Chair ; Dr. Andrew F. Peterson, Committee Member ; Dr. Judith A. Curry, Committee Member. Vita. Includes bibliographical references.

Thesis (Ph. D.)--Ohio State University, 2006. / Title from first page of PDF file. Includes bibliographical references (p. 141-146).

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Dans cette thèse, le concept d'identification par radiofréquence sans puce (chipless RFID) est étendu à l'authentification où chaque étiquette doit présenter une signature unique qui ne peut jamais être reproduite même si quelqu'un tente de copier l'étiquette. À cette fin, le caractère aléatoire naturel (c’est-à-dire inhérent au processus de fabrication) ainsi que les paramètres de dimension des résonateurs sont utilisés. Un tel caractère aléatoire naturel peut produire des signatures électromagnétiques (EM) uniques, éventuellement utilisées pour l'authentification. Initialement, nous avons prouvé l’idée proposée en appliquant intentionnellement les variations dimensionnelles le long des résonateurs. Différentes valeurs des variations dimensionnelles appliquées sont utilisées pour trouver la variation minimale détectable par l'approche radar sans puce RFID. De plus, une analyse statistique a été réalisée pour calculer les taux d'erreur. Par la suite, une approche par spectrogramme est proposée pour extraire des paramètres indépendants de l’aspect (c’est-à-dire la fréquence de résonance et le facteur de qualité) des étiquettes RFID sans puce. Enfin, nous avons fabriqué plusieurs résonateurs présentant un caractère aléatoire naturel (sans aucune variation dimensionnelle appliquée) afin de caractériser la performance des étiquettes sans puce pour les applications d'authentification. Des technologies de réalisation à faible coût basées sur des circuits imprimés avec un procédé de gravure chimique et l’impression à jet d’encre par une imprimante de bureau ordinaire sont utilisées. Le caractère aléatoire naturel selon les dimensions des résonateurs est également confirmé par l'analyse microscopique à l'aide d'un microscope numérique. / In this thesis, the concept of chipless radio frequency identification (RFID) is extended to the chipless authentication where each tag has to present a unique signature that can never be reproduced even if someone tries to copy the tag. For this purpose, natural randomness (i.e., inherent in the fabrication process) along dimension parameters of resonators is utilized. Such natural randomness can produce unique electromagnetic (EM) signatures that are possibly employed for authentication. Initially, we proved the proposed idea by purposely applying the dimensional variations along the resonators. Different values of the purposely applied dimensional variations are used to find the minimum detectable variation by the chipless RFID radar approach. Additionally, a statistical analysis has been performed to calculate the error rates. Subsequently, a spectrogram approach is proposed to extract aspect-independent parameters (i.e., the frequency of resonance and quality factor) of chipless RFID tags. Finally, we fabricated numerous resonators exhibiting natural randomness (without any purposely applied dimensional variations) to characterize the potential of the chipless tags for authentication applications. Low-cost realization technologies such as printed circuit board (PCB) using chemical etching process and inkjet printing using ordinary office printer are utilized. The natural randomness along the dimensions of resonators is also confirmed by the microscopic analysis using a digital microscope.

Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006. / The topic of millimeter wave radar systems is introduced. These radars are used in a wide range of applications in both the aviation and automotive field due to the resolution advantages which MMW systems have above their counterparts. MMW components are studied and characterised to improve on an existing linearisation technique. Different possible linearisation techniques are discussed and compared to choose the best possible technique for this application. This technique was developed and implemented in the existing system.