Microwave Technologies for Satellite Systems: an ESA Perspective

Abstract -This paper intends to review the trends in solid-state microwave technologies and their impact on the anticipated performance enhancement expected for space applications

Innovative Design and Realization of Microwave and Millimeter-Wave Integrated circuits

Ph.DDOCTOR OF PHILOSOPH

Design of an S-band power combiner system with two parallel power amplifiers and phase shifters

Ankara : The Department of Electrical and Electronics Engineering and the Institute of Engineering and Science of Bilkent University, 2011.Thesis (Master's) -- Bilkent University, 2011.Includes bibliographical references leaves 70-72.RF power amplifiers are important blocks in a wireless communication system that play a vital role in determining the level of overall performance. In some situations, more power than a single power amplifier can alone provide is required in applications such as a radar or a space communication system. In such cases, power combiners that can surpass the maximum output power level of a single power amplifier should be used. In this thesis, we study the performance of a power combiner built in classical binary structure. The combiner operates at 3 GHz (S-band) and comprises two power amplifiers which can supply up to 38 dBm of saturated power. Wilkinson power dividers/combiners are utilized at the input/output respectively in order to divide and combine the input and output signals. While building a power combiner, one should also note that the phases of the amplified signals should be matched at the output or else the level of combining loss can reach significant levels. At a phase difference of 180◦ , the signals will be completely out of phase and will combine destructively at the output. Therefore, in our study, in order to be able to control the phases at each arm of the power combiner, two tunable microwave phase shifters are placed before the active devices. The phase shift generated by these shifters are controlled via voltage, hence a desired level of phase shift can be obtained. By this, we demonstrate that phase shifters are also important structures for a power combiner that are instrumental in accomplishing a phase balance between the two arms. The idea behind the work displayed here can be extended to applications requiring much higher power levels or operating at higher frequencies.Özbey, BurakM.S

Approaches to Building a Quantum Computer Based on Semiconductors

Throughout this Ph.D., the quest to build a quantum computer has accelerated, driven by ever-improving fidelities of conventional qubits and the development of new technologies that promise topologically protected qubits with the potential for lifetimes that exceed those of comparable conventional qubits. As such, there has been an explosion of interest in the design of an architecture for a quantum computer. This design would have to include high-quality qubits at the bottom of the stack, be extensible, and allow the layout of many qubits with scalable methods for readout and control of the entire device. Furthermore, the whole experimental infrastructure must handle the requirements for parallel operation of many qubits in the system. Hence the crux of this thesis: to design an architecture for a semiconductor-based quantum computer that encompasses all the elements that would be required to build a large scale quantum machine, and investigate the individual these elements at each layer of this stack, from qubit to readout to control

Industrial and Technological Applications of Power Electronics Systems

The Special Issue "Industrial and Technological Applications of Power Electronics Systems" focuses on: - new strategies of control for electric machines, including sensorless control and fault diagnosis; - existing and emerging industrial applications of GaN and SiC-based converters; - modern methods for electromagnetic compatibility. The book covers topics such as control systems, fault diagnosis, converters, inverters, and electromagnetic interference in power electronics systems. The Special Issue includes 19 scientific papers by industry experts and worldwide professors in the area of electrical engineering

Design and analysis of wideband passive microwave devices using planar structures

A selected volume of work consisting of 84 published journal papers is presented to demonstrate the contributions made by the author in the last seven years of his work at the University of Queensland in the area of Microwave Engineering. The over-arching theme in the author’s works included in this volume is the engineering of novel passive microwave devices that are key components in the building of any microwave system. The author’s contribution covers innovative designs, design methods and analyses for the following key devices and associated systems: Wideband antennas and associated systems Band-notched and multiband antennas Directional couplers and associated systems Power dividers and associated systems Microwave filters Phase shifters Much of the motivation for the work arose from the desire to contribute to the engineering o

Advances in Solid State Circuit Technologies

This book brings together contributions from experts in the fields to describe the current status of important topics in solid-state circuit technologies. It consists of 20 chapters which are grouped under the following categories: general information, circuits and devices, materials, and characterization techniques. These chapters have been written by renowned experts in the respective fields making this book valuable to the integrated circuits and materials science communities. It is intended for a diverse readership including electrical engineers and material scientists in the industry and academic institutions. Readers will be able to familiarize themselves with the latest technologies in the various fields

Contribution à la mise en oeuvre de synthèse de filtres accordables simultanément en fréquence et bande passante : application aux fréquences millimétriques et submillimétriques en technologie BiCMOS

Le but de la thèse est de réaliser des filtres accordable en technologie planaire multi-niveaux proposé par l'entreprise allemande IHP. Les filtres sont réalisés aux ondes millimétriques,principalement autour de 60 GHz et 140 GHz. Nous étudions l'accordabilité en fréquence mais aussi l'accordabilité en bande passante ne utilisant un concept nouveau établie au cours de cette thèse. Les premiers résultats concernant les filtres accordables en fréquence ont permit la rédaction de plusieurs articles. Maintenant, nous venons de recevoir les mesures prouvant notre nouveau concept permettant l'accord en fréquence et en bande passante des filtres planaires à base de résonateurs en annea