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Rozprawy doktorskie na temat „Microwave holography”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 1 sierpnia 2024

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1

Guler, Michael George. "Spherical microwave holography." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/15055.

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Chalodhorn, Wonchalerm. "Use of microwave lenses in phase retrieval microwave holography of reflector antennas." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/14909.

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Marín, Garcia Jordi. "Off-axis holography in microwave imaging systems." Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/285129.

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En las pasadas décadas, la investigación en tecnología de terahercios fue únicamente motivada por instrumentación para los campos de astrofísica y ciencias de la tierra. La principal línea de investigación de estos campos comprende la detección, identificación y mapeo mediante espectroscopia molecular de bandas de emisión y absorción de gases a baja presión. Este campo fue el mayor foco de desarrollo que permitió en primer lugar el desarrollo de instrumentación y tecnología a bandas de terahercios. En contraposición con su uso en campos científicos, la radiación de terahercios es una de las ba

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Dahhan, A. K. "Real-time microwave holography using glow discharge detectors." Thesis, Cardiff University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356739.

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Zhang, Tieren, University of Western Sydney, of Science Technology and Environment College, and School of Engineering and Industrial Design. "Applications of microwave holography to the assessment of antennas and antenna arrays." THESIS_CSTE_EID_Zhang_T.xml, 2001. http://handle.uws.edu.au:8081/1959.7/770.

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Gabor's original holography, which is the basic theory of modern microwave holographic techniques, is introduced. By computer simulations, it is demonstrated that the conventional holographic approach can be used as a tool to reconstruct aperture field distributions of an antenna with some constraints. Computer simulations of the theory and technique of the improved microwave holographic approach originally introduced by Rahmat-Samii et al. are carried out. The results show that it can be used for surface distortion diagnosis of large reflector antennas. The physical optics integral formulatio

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Zhang, Tieren. "Applications of microwave holography to the assessment of antennas and antenna arrays." Thesis, View thesis, 2001. http://handle.uws.edu.au:8081/1959.7/770.

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Gabor's original holography, which is the basic theory of modern microwave holographic techniques, is introduced. By computer simulations, it is demonstrated that the conventional holographic approach can be used as a tool to reconstruct aperture field distributions of an antenna with some constraints. Computer simulations of the theory and technique of the improved microwave holographic approach originally introduced by Rahmat-Samii et al. are carried out. The results show that it can be used for surface distortion diagnosis of large reflector antennas. The physical optics integral formulatio

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7

Zhang, Tieren. "Applications of microwave holography to the assessment of antennas and antenna arrays." View thesis, 2001. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20040330.103805/index.html.

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Thesis (Ph.D.) -- University of Western Sydney, 2001.<br>"Submitted in fulfilment of requirements for the degree of Doctor of Philosophy, School of Engineering and Industrial Design, University of Western Sydney" Includes bibliography.

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Janice, Brian A. "Differential Near Field Holography for Small Antenna Arrays." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/999.

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"Near-field diagnosis of antenna arrays is often done using microwave holography; however, the technique of near-field to near-field back-propagation quickly loses its accuracy with measurements taken farther than one wavelength from the aperture. The loss of accuracy is partially due to windowing, but may also be attributed to the decay of evanescent modes responsible for the fine distribution of the fields close to the array. In an effort to achieve better resolution, the difference between these two phase-synchronized near-field measurements is used and propagated back. The performance of s

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9

Rodriguez, Herrera Diego. "Antenna characterisation and optimal sampling constraints for breast microwave imaging systems with a novel wave speed propagation algorithm." IEEE, 2014. http://hdl.handle.net/1993/31907.

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Breast microwave imaging (BMI) is a novel modality that complements current breast screening tools. Microwave radar imaging creates a radar cross-section (reflection) map of the breast. The difference in permittivity between healthy and malignant tissue is between 10-50%. This contrast is significantly higher than that obtained with x-rays and supports the use of microwave imaging for breast cancer diagnosis. Prior to widespread clinical use, some areas require further study. Firstly, the performance of three different antennas was carried out, to assess their suitability for a BMI system.

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10

Vachiramon, Pithawat. "Free-space optical communications with retro-reflecting acquisition and turbulence compensation." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:9e19fc21-8767-4d6f-9e75-be4527f5e650.

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Free-space optics (FSO), or wireless optical communications, has received extensive research due to its promise of practically limitless bandwidths. However, FSO has challenges yet to be met for a cost effective realisation. This D.Phil thesis explores a solution using a ferro-electric liquid crystal spatial light modulator (FLC SLM) and binary phase holograms to significantly reduce the hardware complexity of an FSO system with auto-alignment and turbulence compensation. The theory of binary phase hologram is presented and extended to obtain a new algorithm that is suitable for a FLC SLM. The

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11

Klečka, Tomáš. "Holografická anténa." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219169.

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This master’s thesis deals with principle of microwave holography, methods of microwave hologram recording and analyzes some types of holographic antennas from structural and functional point of view. It also includes simulations of selected holographic antennas and their modi?cations, applies optimization on three types of antennas. Finally it reviews measured results of three costructed antennas.

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SERRA, GIAMPAOLO. "Una soluzione alternativa al problema della ricostruzione olografica della superficie delle antenne a riflettore da dati in far-field o in near-field." Doctoral thesis, Università degli Studi di Cagliari, 2008. http://hdl.handle.net/11584/265983.

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The retrieval of surface profile of a reflector antenna is an important task, mainly for radio astronomical application. Up to now the microwave holographic reconstruction technique has been applied to far field data either directly measured or extrapolated from near field measurements by using the Fourier transform inversion. The main step of this technique is the computation of the induced currents on the reflector surface. In this thesis the relation between the far field (or near field) and the current on the parabolic reflector surface is formulated as a discrete data inverse problem. Sin

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13

Leach, Mark. "A new method for holographic measurement of microwave antenna radiation patterns." Thesis, Northumbria University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416351.

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The rate at which new communications technologies are being developed has been immense and will continue to intensify for the foreseeable future. This evolution is fuelled by the desire to meet the wants and needs of the global community, by developing devices able to offer ever-increasing functionality, with greater complexity. To achieve this designers are forced to move to higher and higher frequencies. The antenna, as one of the fundamental building blocks of any radiated wave system, and as such, must develop along with the evolution of the communication system be it for, mobile, satellit

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14

Pieroni, Mauro. "Classification of inflationary models and constraints on fundamental physics." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC258/document.

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Ce travail est concentré sur l'étude de la cosmologie primordiale et en particulier sur l'étude de l'inflation. Après une introduction sur la théorie standard du Big Bang, nous discutons de la physique du CMB et nous expliquons comment ses observations peuvent être utilisées pour définir des contraintes sur les modèles cosmologiques. Nous introduisons l'inflation et nous expliquons sa réalisation la plus simple. Nous présentons les observables et les contraintes expérimentales qui peuvent être utilisées pour mettre des contraintes sur les modèles d'inflation. La possibilité d'observer des onde

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15

James, GC. "Microwave holography of large reflector antennas." Thesis, 1992. https://eprints.utas.edu.au/20318/7/whole_JamesGeoffreyCarlyle1992.pdf.

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This thesis describes experiments in Microwave Holography using the 26 m radio telescope at the Mount Pleasant Observatory, and the development of data processing methods to overcome a major limitation of traditional holographic measurements. Microwave Holography is a fast and effective technique for measuring the surface profile of reflector antennas. It requires measurement of the amplitude and phase of the antenna's far field radiation pattern. The Fourier transform relationship of the far field pattern to the aperture current function is used to estimate the aperture phase profile, which

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16

Klein, Benjamin. "Holographic measurement of the 26m HartRAO telescope." Thesis, 2009. http://hdl.handle.net/10539/6936.

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Microwave holography is a well established method of using the Fourier relationship between an antenna’s current distribution and its complex beam-pattern to produce surface maps of large parabolic antennas. As the final part of a surface upgrade, a holographic map of the HartRAO 26 m telescope was produced. This showed that the surface has an RMS error of 0.45 mm. The measurement used a small reference dish to correlate against and retrieve amplitude and phase values. Due to system phase instabilities, this dish had to be attached to the measured antenna in order to enable sharing a high

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17

Bossi, Luca. "A novel microwave imaging RADAR for anti-personnel landmine detection and its integration on a multi-sensor robotic scanner." Doctoral thesis, 2022. http://hdl.handle.net/2158/1272665.

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Per mezzo del finanziamento ottenuto con il progetto North Atlantic Treaty Organization, Science for Peace and Security (NATO SPS) G-5014 è stata sviluppata una piattaforma robotica multi-sensore in grado di individuare oggetti sepolti plastici e metallici e generare dati per la successiva classificazione degli ordigni attraverso l’analisi di operatori specializzati. Utilizzare una piattaforma robotica permette di aumentare la sicurezza per gli operatori, perché completamente controllabile in remoto tramite un’interfaccia software web e permette di utilizzare diversi sensori per massimizzare l

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18

"Feasibility Demonstration of a Massively Parallelizable Near-Field Sensor for Sub-Wavelength Defect Detection and Imaging." Doctoral diss., 2016. http://hdl.handle.net/2286/R.I.38360.

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abstract: To detect and resolve sub-wavelength features at optical frequencies, beyond the diffraction limit, requires sensors that interact with the electromagnetic near-field of those features. Most instruments operating in this modality scan a single detector element across the surface under inspection because the scattered signals from a multiplicity of such elements would end up interfering with each other. However, an alternative massively parallelized configuration, consisting of a remotely interrogating array of dipoles, capable of interrogating multiple adjacent areas of the surface a

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19

Chang, Jinjia, and 張晉嘉. "Probe-Compensated Microwave Holographic Imaging." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/59941485740109173772.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>102<br>A novel probe-compensated microwave holographic imaging method is proposed. Planar scanning by a directive probe antenna is adopted to reconstruct the images of unknown metallic or dielectric targets. Unknown targets are first illuminated by the probe antenna, and then the fields scattered from the targets are received by the probe. Directive or moderate-gain probe antennas are adopted since they are more sensitive to the scattered fields. To enhance the image quality, the proposed approach necessitates the detailed radiation information of the probe antenna

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Tsai, Cheng-Hao, and 蔡政豪. "Three-Dimensional Microwave Holographic Imaging with Probe and Phase Compensations." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/sygcew.

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博士<br>國立臺灣大學<br>電信工程學研究所<br>106<br>A Novel 3-D microwave holographic imaging algorithm compatible with both single-probe and dual-probe scanning setups is proposed for imaging dielectric targets. In some cases, even with only one probe antenna, the quality of the images reconstructed using the proposed algorithm is comparable or even superior to those using dual-probe-based methods. The proposed algorithms can be divided into four parts. First, starting from the open-circuit voltage of an antenna, the proposed algorithm compensates for both transmitting and receiving properties of the probe an

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