With the demand of modern wireless communications, monolithic microwave integrated circuit (MMIC) has become a very promising technique as it is mass-productive, low loss and highly integrated. Microstrip and Coplanar Waveguide (CPW) are both widely used in MMIC. Particularly, CPW has seen a rapid increase on research works recent years due to its unique capability including having less parasitic contribution to the circuit. In this thesis, a novel 3-D multilayer CPW technique is presented. Semi-insulating (S.I.) GaAs substrate, polyimide dielectric layers and Titanium/Gold metal layers are employed in this five-layer structure. The active devices are based on GaAs pHEMTs technology provided by Filtronic Compound Semiconductor Ltd. The fabricated components are simulated and characterized by Agilent Advanced Design System (ADS) and Momentum E.M simulator. A novel Open-short-through de-embedding technique is developed and applied to the passive circuits in order to reduce the impact of pads on probing. A new library of components and circuits are built in this work. Various structures of 3-D CPW transmission lines are designed and characterized to demonstrate the low-loss and highly compact characters. Meanwhile, the influence of various combinations of metal and dielectric layers is studied in order to provide designers with great flexibility for the realization of novel compact transmission lines for 3D MMICs. The effect of temperature on the performance of the transmission lines has also been investigated. Moreover, a set of compact capacitors are designed and proven to have high capacitance density with low parasitics. Finally, based on the extraction of pHEMT parameters from circuit characterization and analysis program (IC-CAP), RF switch and active filter MMICs have been designed and simulated to provide references for further development of 3-D multilayer CPW circuits.

Master of Science / Department of Electrical and Computer Engineering / William B. Kuhn / An important concern for high speed circuit designs is that of crosstalk and electromagnetic interference. In PCB board-level designs, crosstalk at microwave frequencies may result from imperfections in shielding of PCB interconnects or more generally transmission lines. Several studies have been done to characterize and improve the isolation between PCB transmission lines for both digital and RF circuits. For example, previous studies in the microwave region have examined the effect that line type, line length, and separation have on crosstalk and suggest that without full shielding, the upper limit of isolation is on the order of 60dB for traditional board-level lines [1]. In order to more fully characterize crosstalk and improve isolation above 60 dB, this thesis studies signal-to-ground-plane separation, considers advanced line types, and examines the effect of 3D shielding. Results are presented from 100MHz to 30GHz for the traditional transmission line structures of microstrip, CPW, differential pair and CPW differential pair. This study shows that with a halving of distance between signal and ground planes, isolation between transmission lines can be reduced by as much as 20dB, making this one of the best ways to improve performance. Advanced methods of shielding are then presented. Direct launch stripline and single-sided CPW improve upon existing crosstalk reduction techniques, while split shielding and ablation of dielectric PCB material are also proposed. The data and additional crosstalk reduction techniques discussed in this thesis serve two purposes. One: with a more complete understanding of the effects that transmission line types and parameters have on crosstalk, engineers can quickly identify potential crosstalk issues and resolve them before manufacturing. Second, this thesis presents the engineer with four new additional techniques that may become available in advanced manufacturing environments. Such techniques can further reduce crosstalk and may allow for isolation values to approach 100 dB at the PC board level.

Due to the release of 3.1-10.6 GHz band, UWB systems have a rapidly progressive development. They have been widely employed in short-range communication applications and large-bandwidth handheld devices. As part of the system, the UWB antenna plays an extremely important role. Due to the trend towards integrated printed circuits, co-planar waveguide technology is a feasible solution for designing the UWB antenna. This thesis focuses on designing a UWB co-planar waveguide antenna with a band-stop filter. This band-stop filter offers rejection to unwanted frequencies in the range of the operating band in order to avoid unnecessary interference from other communication applications and improve its own system’s performance. In addition, it can divide the whole wide band into a few sub-bands. This will create more flexibility for practical applications. The professional full-wave field solver software package CST Microwave Studio is used as the analysis tool to obtain the performances of this antenna. It operates from 3.1 GHz to 10.6 GHz with a VSWR < 2 in the pass bands, and a VSWR > 2 in the stop bands. The selected frequencies demonstrate nearly omni-directional characteristics in radiation patterns. Comparing with other published UWB antenna designs, relatively reasonable group delay results are achieved. Measurements on a fabricated prototype validate the design approach. / Graduate / 0537 / wang@uvic.ca

Ce travail a été réalisé dans le cadre du projet GRACY regroupant l’IEMN et d’autres laboratoires de recherche : CALISTO et IMS Bordeaux. Ce manuscrit fait état d’une synthèse exhaustive des études et avancées menées dans le cadre de ce travail de thèse au sein de l’Institut d’Électronique, de Microélectronique et de Nanotechnologie (IEMN) dans le groupe CARBON. Le principal axe de réflexion de ce travail repose sur la conception, la modélisation et la caractérisation des dispositifs actifs et passifs sur substrat souples et rigides en vue du développement de nouveaux composants et de circuits électroniques avec des critères de performances de plus en plus importants. Au cours de ce travail, l’accent a été principalement portée sur les étapes essentielles à la réalisation de circuit intégré en ondes millimétriques utilisant la technologie coplanaire en impression jet d’encre et les transistors à effet de champ à base de graphène (GFETs). Ce mémoire montre en particulier l’intérêt et les potentialités du graphène pour son intégration au sein des circuits électroniques. De plus, une attention particulière a été portée sur la modélisation et les techniques de caractérisations relatives aux dispositifs passifs sur substrat souple. Par conséquent, un banc de caractérisation de ces éléments sur substrat flexibles a été développé au cours de cette thèse afin de vérifier et consolider expérimentalement leurs comportements. / This work was carried out under the project involving GRACY IEMN and other research laboratories: CALISTO and IMS Bordeaux. This manuscript reports a comprehensive overview of studies and advanced conducted as part of this thesis in the Institute of Electronics, Microelectronics and Nanotechnology (IEMN) in CARBON group. The main reflection axis of this work is based on the design, modeling and characterization of active and passive devices on flexible and rigid substrates for the development of new components and electronic circuits with increasingly important performance criteria. During this work, the focus was mainly focused on the essential steps to achieving integrated circuit millimeter wave using coplanar technology by inkjet printing and field effect transistors based on graphene (GFETs). This memory in particular shows the importance and potential of graphene for integration into electronic circuits. In addition, special attention was paid on modeling and characterization techniques related to passive devices on flexible substrates. Therefore, a characterization bench of these elements on flexible substrate has been developed during this thesis to verify and consolidate their behavior experimentally.

The purpose of this thesis is to design and fabricate Gigahertz range voltage controlled oscillator based on intrinsically tunable film bulk acoustic resonator.Modified Butterworth Van Dyke (MBVD) model was studied and implemented to simulate FBAR behavior. Advanced designed system (ADS) was used as the simulation tool.Oscillator theory is studied and an oscillator based on non-tunable FBAR at 2GHz is simulated which shows -132 dBc/Hz phase noise @ 100 kHz offset frequency.A 5.5 GHz Voltage controlled oscillator based on intrinsically tunable FBAR is designed. Frequency tuning of 129 MHz with phase noise of -106 dBc/Hz @ 100 kHz is achieved. The circuit is designed on a novel carrier substrate which includes integrated resonators and passive components. Bipolar junction transistors are mounted on the carrier substrate by silver epoxy. The thesis describes the design, development and processing of the carrier substrate, BSTO based resonators, and the oscillator circuit.

Yes / A type of telecommunication technology called an ultra-wideband (UWB) is used to provide a typical solution for short-range wireless communication due to large bandwidth and low power consumption in transmission and reception. Printed monopole antennas are considered as a preferred platform for implementing this technology because of its alluring characteristics such as light weight, low cost, ease of fabrication, integration capability with other systems, etc. Therefore, a compact-sized ultra-wideband (UWB) printed monopole antenna with improved gain and efficiency is presented in this article. Computer simulation technology microwave studio (CSTMWS) software is used to build and analyze the proposed antenna design technique. This broadband printed monopole antenna contains a jug-shaped radiator fed by a coplanar waveguide (CPW) technique. The designed UWB antenna is fabricated on a low-cost FR-4 substrate with relative permittivity of 4.3, loss tangent of 0.025, and a standard height of 1.6 mm, sized at 25 mm × 22 mm × 1.6 mm, suitable for wireless communication system. The designed UWB antenna works with maximum gain (peak gain of 4.1 dB) across the whole UWB spectrum of 3–11 GHz. The results are simulated, measured, and debated in detail. Different parametric studies based on numerical simulations are involved to arrive at the optimal design through monitoring the effects of adding cuts on the performance of the proposed antennas. Therefore, these parametric studies are optimized to achieve maximum antenna bandwidth with relatively best gain. The proposed patch antenna shape is like a jug with a handle that offers greater bandwidth, good gain, higher efficiency, and compact size.

This thesis presents design, modeling, and fabrication of an RF MEMS adjustable impedance matching network. The device employs the basic triple stub matching technique for impedance matching. It has three adjustable length stubs which are implemented using capacitively loaded coplanar waveguides. The capacitive loading of the stubs are realized using the MEMS switches which are evenly distributed over the stubs. There are 40 MEMS bridges on each stub whichare separated with &amp / #955 / /40 spacing making a total of 120 MEMS switches in the structure. The variability of the stub length is accomplished by closing the MEMS switch nearest to the required stub length, and making a virtual short circuit to ground. The device is theoretically capable of doing matching to every point on the Smith chart. The device is built on coplanar waveguide transmission lines. It has a center operating frequency of 10GHz, but because of its adjustability property it is expected to work in 1-40GHz range. It has dimensions of 8950 &times / 5720&micro / m2. This work is the continuation of the first national work on fabrication of RF MEMS devices. The device in this work is fabricated using the surface micromachining technology in the microelectronic facilities of Middle East Technical University.

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