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Dissertations / Theses on the topic 'Microwave attenuator'

Author: Grafiati

Published: 4 June 2021

Last updated: 21 February 2023

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1

Sizhen, Lan, and Shen Lian. "Microwave Components Based on Magnetic Wires." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-13883.

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With the continuous advances in microwave technology, microwave components and related magnetic materials become more important in industrial environment. In order to further develop the microwave components, it is of interest to find new kinds of technologies and materials. Here, we introduce a new kind of material -- amorphous metallic wires which could be used in microwave components, and use these wires to design new kinds of attenuators. Based on the fundamental magnetic properties of amorphous wires and transmission line theory, we design

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2

LONGHI, PATRICK ETTORE. "Circuiti e sottosistemi a microonde e onde millimetriche per ricevitori a basso rumore e antenne intelligenti." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2009. http://hdl.handle.net/2108/917.

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Questo lavoro affronta gli aspetti riguardanti le metodologie e tecniche di analisi e progettazione per alcune funzionalità in front-end ricevitori a radiofrequenza ad elevata sensibilità e riconfigurabili. Tali funzionalità sono: l’amplificazione a basso rumore e il controllo dell’ampiezza di un segnale a RF. Infine, un’ulteriore investigazione ha focalizzato gli aspetti e le criticità in circuiti multi-funzione a elevata integrazione. E’ stata mostrata una metodologia per progettazione di amplificatori a basso rumore a microonde che ha portato a definire le relazioni di adattamento simulta

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3

Haidar, Jihad. "Commande optoélectronique d'atténuateurs, de résonateurs et de filtres microondes réalises sur substrat silicium." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0094.

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La commande optique de dispositifs microondes, qui exploite l'injection optique des porteurs dans un semiconducteur, apporte de nombreux avantages vis-a-vis de l'electronique conventionnelle. La presente etude avait pour objectif d'etendre cette commande a des dispositifs, realisant des fonctions complexes, tels que les attenuateurs, resonateurs et filtres microondes. Les structures etudiees ont ete realisees sur du silicium en technologie ligne microruban. Nous avons exploite principalement la charge complexe induite entre le ruban et le plan de masse par illumination optique. Nous avons demo

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4

Rahimi, Amir R. "Statistical validation of rainfall estimates obtained from microwave attenuation." Thesis, University of Essex, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401039.

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5

Robbins, Gavin Lee. "Assimilating microwave link attenuation estimates of rainfall into an hydraulic model." Thesis, University of Salford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419080.

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6

Lin, Kuan-ting. "Site-diversity attenuation measurements at 28 GHz by radiometers for an earth-space path /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487265143147216.

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7

Townsend, Adrian J. "A study of the raindrop size distribution and its effect on microwave attenuation." Thesis, University of Bath, 2011. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538139.

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Current frequency allocations below Ku- band are becoming increasingly congested. The problem continues to grow as the use of telecommunications becomes more pop- ular. In order to compensate for increased in demand, telecommunication operating frequencies have to be raised, yielding larger channel capacity. However, raising the operating frequency has the adverse result of intensifying the attenuation effects of the troposphere. At high frequencies, such as V-band, rain is known to cause the most severe attenuation. It has been shown that model data for numerical weather prediction, combined

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8

Direskeneli, Haldun. "Applications of the differential reflectivity radar technique : focus on estimation of rainfall parameters and microwave attenuation prediction /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487331541708646.

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9

Zohidov, Bahtiyor. "Retrieval of rainfall fields using signal attenuation measurements from commercial microwave links. A modeling feasibility study." Thesis, Ecole centrale de Nantes, 2016. http://www.theses.fr/2016ECDN0022.

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L’objectif de cette étude est d’évaluer la faisabilité de la reconstitution des champs de précipitations dans les zones urbaines à l’aide de liaisons hyper - fréquence commerciales. Dans un cadre de simulations appliquées à une étude de cas réaliste, une attention particulière est portée au réseau de téléphonie mobile et à la ville de Nantes en France. Comme base, nous utilisons un ensemble de données composé de 207 images radar météo enregistrées par Météo - France (bande C) à haute résolution spatiale (250m x 250m) et temporelle (5 min). Nous avons généré des données d’atténuation de pluie l

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10

Laster, Jeff D. "Frequency scaling of rain attenuation on satellite links in the Ku/Ka-bands using OLYMPUS satellite data." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06162009-063211/.

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11

Ghauri, Farzan Naseer. "Hybrid Photonic Signal Processing." Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3233.

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This thesis proposes research of novel hybrid photonic signal processing systems in the areas of optical communications, test and measurement, RF signal processing and extreme environment optical sensors. It will be shown that use of innovative hybrid techniques allows design of photonic signal processing systems with superior performance parameters and enhanced capabilities. These applications can be divided into domains of analog-digital hybrid signal processing applications and free-space--fiber-coupled hybrid optical sensors. The analog-digital hybrid signal processing applications include

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12

Qiu, Wei [Verfasser], and Harald [Akademischer Betreuer] Kunstmann. "Copula-Based Precipitation Fields Estimation Combining Data from Radar, Gauge and Microwave Attenuation / Wei Qiu. Betreuer: Harald Kunstmann." Augsburg : Universität Augsburg, 2013. http://d-nb.info/1077701632/34.

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13

Ajaz, Haroon. "Study of fade and inter-fade durations in Ku- and Ka- band frequencies using OLYMPUS satellite beacons." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-12042009-020112/.

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14

Boubakra, Abdelkrim. "Etude de la propagation d'une onde electromagnetique de surface de type he : :(11) en hyperfrequence." Clermont-Ferrand 2, 1987. http://www.theses.fr/1987CLF21033.

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On etudie en hyperfrequence d'un point de vue analytique, numerique et experimental, la propagation d'une onde electromagnetique de type he::(11) a la surface d'un conducteur cylindrique gaine d'une couche dielectrique, un deuxieme dielectrique occupant le reste de l'espace

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15

Moupfouma, Fidèle. "Etude des précipitations et de leurs effets sur les liaisons hertziennes en visibilité et par satellite dans les régions tropicales." Paris 13, 1987. http://www.theses.fr/1987PA132007.

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Modèle mathématique semi empirique décrivant la distribution cumulative des intensités de pluie quelle que soit la région du monde. Etude de l'influence des affaiblissements dus à la place sur la qualité de fonctionnement des systèmes et modèle de prévision des affaiblissements. Adaptation d'un des paramétres à chacune des regions du globe

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16

Svoboda, Jan. "Bezdrátové spoje pro metropolitní sítě." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219290.

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This Master’s thesis analizes technologies suitable for metropolitan area networks. In this thesis there are mentioned technologies used for wireless transfer with speeds above 1 Gbps. There are described basic features and parameters of microwave radio relay links in 70/80GHz range and free space optic links. These technologies are compared with classic optical networks. Practical part of thesis was focused on development of application which calculates signal attenuation caused by the passage of the atmosphere for both technologies. Results gained from this application are mentioned in this

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17

Li, I.-Yin, and 李宜音. "Micromachined Microwave Attenuator." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/91424163416751452580.

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碩士<br>國立臺灣大學<br>應用力學研究所<br>89<br>This thesis proposes a microwave attenuator at 30GHz. The circuit design, material selection, and simulating of the attenuator are discussed, as well as the compatible process of microwave MEMS mechanical switch. This work completes the implementation of the attenuator, and that of the metal contact-serial switch is partially done. Unlike conventional high-frequency microwave circuit that takes GaAS as the main transmission line material, this thesis uses high-resistivity silicon wafer and Ni with 1μm in thickness by electrode. To obtain better micro

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18

Liu, Shi-Wen, and 劉士文. "Study of RF MEMS microwave attenuator with constant phase." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/52353131099026381453.

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碩士<br>國立臺灣大學<br>應用力學研究所<br>91<br>After successfully combining MEMS technology with microwave theorem , this thesis develops the new ideals and fabricates two kinds of attenuator with constant phase at 30GHz－transmission type and reflection type constant phase attenuator. This thesis uses MEMS technique to fabricate the microwave capacitive switch and attenuators. These devices that are fabricated by MEMS techniques are not only small area but also outstanding performance. Their costs are cheaper than semiconductor devices and have the opportunities of mass production. Unlike convent

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19

Adetan, Oluwumi. "Modeling of raindrop size distribution and critical diameters for rainfall attenuation over microwave links in Southern Africa." Thesis, 2014. http://hdl.handle.net/10413/11220.

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The inability of service providers to constantly meet the design target of 99.99 % availability of the line-of-sight (LOS) microwave links has caused concern among both the operators and consumers. The non-availability of the links is predominantly due to propagation impairments along the propagation link. These propagation effects include cloud, snow, fog, gas attenuation, rain and atmospheric scintillation. Various studies have shown high vulnerability of radio communication systems operating at microwave (3-30 GHz) and millimeter wave (30-300 GHz) to rainfall attenuation especially in the t

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20

Owolawi, Pius Adewale. "Characteristics of rain at microwave and millimetric bands for terrestrial and satellite links attenuation in South Africa and surrounding islands." Thesis, 2010. http://hdl.handle.net/10413/1592.

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The emergence of a vast range of communication devices running on different types of technology has made convergence of technology become the order of the day. This revolution observed in communications technology has resulted in a pressing need for larger bandwidth, higher data rate and better spectrum availability, and it has become important that these factors be addressed. As such, this has resulted in the current resurgence of interest to investigate higher electromagnetic spectrum space that can take care of these needs. For the past decade, microwave (3 GHz-30 GHz) and millimeter waves

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