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 45 for “"bandpass filters"”.
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Miniaturised bandpass filters for wireless communications
… development and realization of RF and microwave filters, which have not only sustained but fuelled microwave filter research over the many years. These developments have encouraged new solutions and techniques for the realization of compact, low loss, highly selective RF and microwave bandpass …
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CAD of rectangular-ridged waveguide bandpass filters
… the design of rectangular or ridged waveguide bandpass filters using a computer. It studies the analysis of rectangular and ridged waveguide discontinuities using Mode-Matching (MM) and explains how to obtain the Generalized Scattering Matrix (GSM) form the MM analysis. Then, the thesis shows …
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Integration of microwave and millimeter wave bandpass filters with antennas
Filters and antennas are essential elements in communication and radar systems. In a conventional design, antennas and filters are designed independently and then connected together through transitions and/or connectors, which introduces loss and increases the size of the design. Filter and antenna …
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Bragg reflector thin-film resonators for miniature PCS bandpass filters
Thin-Film Resonator (TFR) based bandpass filters are an economically attractive alternative to current dielectric filters. TFR based filters are orders of magnitude smaller and can potentially be manufactured on-chip, thereby allowing VLSI integration of bandpass filters into a RF portable radio …
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Novel miniature microwave quasi-elliptical function bandpass filters with wideband harmonic suppression
Filters are integral components in all wireless communication systems, and their function is to permit predefined band of frequencies into the system and reject all other signals. The ever-growing demand in the use of the radio frequency (RF) spectrum for new applications has resulted in the need …
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A sealed cavity thin-film acoustic resonator process for RF bandpass filters
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Bandpass filters for unconstrained target recognition and their implementation in coherent optical correlators
… Specifically, it is shown that variable bandpass filters can be implemented directly in the correlator by adjusting the relative strengths of the signal and reference beams used to write the Fourier transform hologram into the photorefractive. The synthetic discriminant function (SDF) …
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Resonator sensors integrated in bandpass filters for the detection and attenuation of interfering signals
… filter. The proposed method employs a combline bandpass filter at 2 GHz center frequency at 5% bandwidth, which was designed on Advanced Design System (ADS) software and space mapping was performed to optimize the parameters. By weakly coupling the resonator to the filter, the interference …
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Development of planar filters and diplexers for wireless transceiver front ends
… of this work is the design of compact microstrip bandpass filters and diplexers and the investigation of applications of these circuits in integrated transceiver RF front-end. The core of this thesis therefore presents the following stages of the work: - Analysis of coupled pseudo-interdigital …
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Integrated Filter Antennas for Wireless Transceivers
… the research carried out on the integration of filters and antennas for wireless transceivers. Filters and antennas are parts of wireless transceivers of all wireless communication systems. Filters and antennas, albeit connected, are separate circuits which take up their own individual space in …
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Multilayer Micromachined RF MEMS Filters at Ka and L/S Band For On-Board Satellite Communication Systems
… for the realization of Radio Frequency (RF) bandpass filters. The work has been inspired and supported by the European Space Agency (ESA) Contract No. 22706/09/NL/GLC of the ARTES 5 Workplan 2008 “Micro-machined Filters in Multi-layer Technology for Satellite On-board Communication …
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Active filters for biological signal analysis
… domain is the subject of this paper. Several filters were constructed and the results of a particular filter were analyzed. The problem of obtaining a constant power spectrum when a signal is divided into a number of bands by bandpass filters was investigated. This is very important in …
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Experimental study of the frequency correlation of space-time entangled photons
… frequency correlation is observed using ~0.5 nm bandpass filters to measure the frequencies of entangled photons with >100 nm individual bandwidths.
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Analog Signal Processing Elements for Energy-Constrained Platforms
… by a FFT/DFT in the digital domain or a bank of bandpass filters in the analog domain. The work presented here is designed to function within the parallel, array-based environment of a bank of bandpass filters. Work to improve the simulation of programmable analog storage elements (Floating-Gate …
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Analytical applications of nanostructured plasmonic crystals
… layer-by-layer assemblies acquired using bandpass filters to restrict the accessible wavelength ranges and quantitatively calibrated to the surface film thickness. As a model system, Aplysia pedal neurons were cultured on the plasmonic crystal surface, and the thicknesses of neuronal …
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Tunable compact microwave multiplexers based on substrate integrated waveguide
… The tunable diplexer is formed by cascading a bandpass filter with the HCFM, thereby simplifying the tuning complexity of diplexers. Particularly, the bandwidths and center frequencies of the diplexer can be modified by simply tuning the center frequencies of the bandpass filters and/or the …
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A piezo-tunable gigahertz cavity microelectromechanical resonator
… need high-frequency widely-tunable high-Q bandpass filters for channel selection filters and local oscillators. This thesis describes the design, fabrication and testing of a electromagnetic cavity resonator designed for such applications. Alternative technologies provide wide tuning or …
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Bandpass filter design with spurious frequency reduction capability
… are various topologies to implement microstrip bandpass filters such as end-coupled, parallel coupled, hairpin, interdigital and combine filters. This thesis discusses design, simulation, fabrication and testing using microstrip technology. The choice of a parallel coupled filter topology is …
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Phenomena that determine knock onset in spark-ignited engines
… to have an operator listening to the engine. Bandpass filters and smoothing techniques were used to process the data. The processed data was then used to determine knock intensities for each cycle for both the cylinder pressure data and microphone signal. Also, the rate of build-up before …
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State Space Methods Using Biologically-Relevant Generative Models to Analyze Neural Signals
… problem in neuroscience. Commonly-used bandpass filters produce spurious oscillations when applied to broad-band noise and may be ill-informed by canonical frequency bands. Curve-fitting procedures have been developed to identify peaks in the power spectrum distinct from broadband noise. …
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