Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"Microwave filters"”.
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Micromachined microwave filters
Microwave circuits in the millimetre wave region demand low loss, and low dispersion transmission lines. The work carried out in this thesis is on low loss transmission lines and filters, based on a square coaxial transmission line which is made only of metal, avoiding dielectric and radiation …
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Tunable microwave filters using ferroelectric thin films
Frequency agile microwave devices based on Barium Strontium Titanate (BST) thin films have gained a lot of interest in recent years. The frequency agility of the ferroelectric devices is based on the external DC electric field controlled permittivity of BST thin film. In this research work, several …
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Integrated Tunable LC Higher-Order Microwave Filters for Interference Mitigation
… bottleneck for SDRs as the traditional off-chip filters are fixed frequency and bulky. Therefore, tunable filtering is a critical building block for the reconfigurable RF front-ends and on-chip implementations are needed to meet size and weight constraints. On-chip passive components are lossy, …
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Compact integrated designs of microwave filters and antennas with dual-polarization
Microwave antenna and filter circuits are key components in all types of communication systems. In order to achieve high compactness and high performance for next generation wireless networks, this thesis investigates the use of a material with a high dielectric constant (approximately 20) and low …
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Design, Modelling and Implementation of Several Multi-Standard High Performance Single-Wideband and Multi-Wideband Microwave Planar Filters
… work are to review, investigate and model the microwave planar filters of the modern wireless communication system. The recent main stream of microwave filters are classified and discussed separately. Various microwave filters with detailed applications are investigated in terms of their …
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Synthesis and Design of Microwave Wideband Filters and Components
… There is broad interest in developing wideband microwave passive components that enable the successful building and integration of wideband communication systems. The main objective of this dissertation is the development of exact synthesis techniques for wideband microwave filters, based on …
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A computational tool for microstrip planar filter design
Filters are very important part of any communication system. Naturally, RF and microwave systems belong to these systems. Microwave filters are needed in a wide range of applications including satellite communications and wireless communications as well as military applications. Planar filters …
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Design and performance of resonant cavities for communication systems. The theory and performance of resonant cavities for application-, in mobile radio and base-stations in the VHF and UHF bands are investigated.
… to achieve this has been found in the use of filters inserted in the transmission line between the antenna and the transmitter(s) on one hand and the receiver(s) on the other hand. The basic unit employed in the design of microwave filters is usually a cavity resonator of which the most …
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Effective modeling of advanced filters and multiplexing networks
Microwave filters and multiplexers are widely used in all types of electronic systems. This research focuses on advanced filters and multiplexers for applications in communication satellites with stringent requirements and specifications. Conventional modeling techniques are typically either based …
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Interaction Effects in Nickel Nanowires Arrays
… candidates in many technological applications as microwave filters, sensors or devices for data storage. Because of their strong potential as candidates in such applications they became lately the object of many studies. However, due to the very complicated nature of the interwire interactions, …
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Fabrication of Superconducting Reflectionless Filters for Quantum Microwave Circuits
… quantum circuits depends critically on the microwave environment. Minimizing signal reflections and suppressing thermal noise are essential for achieving high-fidelity readout and preserving qubit coherence. A significant challenge arises from the use of conventional cryogenic components …
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The Application of Advanced Operator Genetic Algorithms to Electromagnetic Optimization Problems
… and applied to the optimization of E-plane microwave filters and frequency selective surfaces. Domain decomposition, the technique of breaking a given problem into parts and optimizing each part separately, is shown to accelerate both the analysis of the devices and the convergence of the …
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Miniaturised and reconfigurable planar filters for ultra-wideband applications
… research is to develop reconfigurable planar microwave filters for ultrawideband applications. The project investigates some key design issues of reconfigurable filters, which are being observed constantly in the latest development and realisation of microwave filters. Both analytical and …
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Design and implementation of L and X-band filters for the NeXtRAD front end
Microwave filters are required at the RF front end of a research radar called NeXtRAD to suppress out of band transmitted and received signals. NeXtRAD is a multistatic pulse-Doppler radar system, developed at the University of Cape Town (UCT) in collaboration with the University College London …
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Compact microwave filter designs based on cavity resonators
Cavity resonators are widely used in microwave filters and multiplexers due to their high quality factor and high power handling capability. Compact designs of these filters are important for practical applications, as they are generally bulky. In this thesis, two types of compact microwave filter …
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Reflected Group Delay method with Space Mapping Techniques for Coupled-Resonator Filter Design
The RF (radio frequency) and microwave filter is widely used in various applications in the fields of radio broadcasting, radar, telecommunication and satellite technologies. The design methods of RF and microwave filters are important topics, especially for electromagnetic (EM) based design. In …
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A Post-Fabrication Tuning Method for a Varactor-Tuned Microstrip Filter using the Space Mapping Technique
The RF (radio frequency) and microwave filter is of great importance in the most of the microwave applications which are widely used in broadcasting radios, televisions, radar techniques, telecommunications and satellite applications. Most of the microwave devices contain microwave filter blocks …
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Multiband RF/Microwave Front-end Receiver Design for Multi-Standard Applications
… bands increases, the number of external filters and low-noise amplifiers in a commonly used multi-standard receiver with parallel architecture increases. It leads to high power consumption and low feasibility for high integration design. Compared to the RF transmitter, the design of the …
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