Tesis sobre el tema "Frequency ratio measurement"
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Blackard, Kenneth Lee. "Measurements and models of radio frequency impulsive noise inside buildings". Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-08182009-040318/.
Texto completoWiles, Andrew Donald. "Modelling Framework for Radio Frequency Spatial Measurement". Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/771.
Texto completoIn this thesis, a modelling framework for the investigation of spatial measurement based on radio frequency signals was developed. The simulation framework was designed for the purpose of investigating different position determination algorithms and sensor geomatries. A finite element model using the FEMLAB partial differential equation modelling tool was created for a time-domain model of electromagnetic wave propagation in order to simulate the radio frequency signals travelling from a transmitting source antenna to a set of receiving antenna sensors. Electronic line signals were obtained using a simple receiving infinitesimal dipole model and input into a time difference of arrival localization algorithm. The finite element model results were validated against a set of analytical solutions for the free space case. The accuracy of the localization algorithm was measured against a set of possible applications for a potential radio frequency spatial measurement system design.
It was concluded that the simulation framework was successful should one significant deficiency be corrected in future research endeavours. A phase error was observed in the signals extracted at the receiving antenna locations. This phase error, which can be up to 40°, was attributed to the zeroth order finite elements implemented in the finite element model. This phase error can be corrected in the future if higher order vector elements are introduced into future versions of FEMLAB or via the development of custom finite element analysis software but were not implemented in this thesis due to time constraints. Other improvements were also suggested for future work.
Maguire, Sean Thomas George. "Attitude determination using low frequency radio polarisation measurements". Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708927.
Texto completoHellgesson, Markus y Daniel Andersson. "Design of automatic measurements systems for characterizing RF-components". Thesis, University West, Department of Technology, Mathematics and Computer Science, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-387.
Texto completoChoeysakul, Chittawan. "Small reverberation chambers for radio frequency emission measurements: a radio astronomy feasibility study". Thesis, Curtin University, 2015. http://hdl.handle.net/20.500.11937/2136.
Texto completoStuart, Thomas (Thomas Edward Walter). "The measurement of radio frequency complex permeability of thin round wires". Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53657.
Texto completoENGLISH ABSTRACT: This thesis is concerned with the measurement of the complex permeability of thin round wires at radio frequencies. This is of interest as such wires are used in various applications, such as absorbing chaff. Iron and nickel alloys are also used for their good tensile properties but have an undesired electromagnetic effect which needs to be characterised. Although little work has been done in this field in recent decades it remains a relevant problem. In this thesis the advantages of accurate wide-band measurements performed by automatic network analysers are applied to the field. The measurement system is a closed coaxial transmission line with a short circuit termination. The centre conductor is the wire of interest. The surface impedance of the wire is related to complex permeability and is measured using low-loss transmission line approximations applied to half-wavelength resonances. The loss associated with complex permeability is separated from conductivity by a D.C. conductivity measurement. A full wave analysis of the coaxial mode was performed and compared to measured values. The maximum error of the propagation constant was found to be 31% at the highest frequencies and was primarily due to length uncertainties. By varying parameters expected error bands around the measured permeability were found. These bands are of the order 1 and demonstrate that the system is sufficiently robust. The measurement of the permeability of two non-magnetic wires was performed and a relative permeability of 1 was found, demonstrating the correct working of the system. A steel wire was measured and compared to measurements found in literature. The permeability dropped as frequency rose as was expected, and an acceptable comparison to other measurements was made as there is no verification standard. Thus a simple measurement system that takes advantage of calibrated automatic network analyser measurements has been developed and demonstrated to work with sufficient accuracy.
AFRIKAANSE OPSOMMING: In hierdie tesis word die meting van die komplekse permeabiliteit van dun ronde drade by radio frekwensies ondersoek. Hierdie drade word in verskeie toepassings gebruik, waaronder dié van absorberende materiale. Nikkel- en ysterallooie word ook vir hul goeie breekkrageienskappe gebruik. In laasgenoemde gevalle moet die ongewenste elektromagnetiese effekte wat voorkom, gekarakteriseer word. Hoewel baie min werk in onlangse dekades gedoen is, bly die meting van die komplekse permeabiliteit 'n relevante probleem. In hierdie tesis word die voordele van akkurate wyeband metings, soos geneem deur 'n outomatiese netwerk analiseerder, toegepas in dié veld. Die meetopstelling is 'n geslote koaksiale transmissielyn, kortgesluit aan een end. Die middel geleier is die draad van belang. Die oppervlak impedansie van die draad is verwant aan die komplekse permeabiliteit, en word gemeet deur die gebruik van lae verlies transmissielyn benaderings, soos toegepas op halfgolf resonante frekwensies. Die verlies wat met die komplekse permeabiliteit geassosieer word, word van die geleidingsvermoë onderskei deur 'n G.S. meting van die geleidingsvermoë. 'n Volgolf analise van die koaksiale mode is uitgevoer en met gemete waardes vergelyk. 'n Maksimum fout van 31% by die hoogste frekwensie is in die voortplantingskonstante gevind. Hierdie volg primêr uit onsekerhede in lengte. Deur die parameters te varieer kon 'n verwagte foutband rondom die gemete permeabiliteit gevind word. Hierdie bande is van die orde 1 waaruit volg dat die stelsel 'n genoegsame robuustheid toon. Die komplekse permeabiliteit van twee nie-magnetiese drade is gemeet en 'n relatiewe permeabiliteit van 1 is gevind. Hierdie bevestig die korrekte werking van die stelsel. 'n Staal draad is opgemeet en met gepubliseerde meetresultate vergelyk. Soos verwag, verminder die permeabiliteit met 'n verhoging in frekwensie. Hoewel geen verifiëringstandaard beskikbaar is nie, is 'n aanvaarbare vergelyking met ander metings gemaak. Die produk van die navorsing is 'n metingstelsel wat, met behulp van 'n gekalibreerde outomatiese netwerk analiseerder, aanvaarbare akkuraatheid in die meting van die komplekse permeabiliteit van dun ronde drade by radio frekwensies kan verkry.
Tigga, Celine. "Modelling of Measurement Equipment for High Frequency Electromagnetic Fields". Thesis, Högskolan i Gävle, Avdelningen för elektronik, matematik och naturvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-18894.
Texto completoHammoudeh, A. "Millimetric wavelength mobile radio characterisation and frequency diversity propagation measurements". Thesis, University of Bath, 1990. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.256904.
Texto completoLandin, Per. "On radio frequency behavioral modeling measurement techniques, devices and validation aspects /". Licentiate thesis, Stockholm : Skolan för elektro- och systemteknik, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11678.
Texto completoLandin, Per N. "On Radio Frequency Behavioral Modeling : Measurement Techniques, Devices and Validation Aspects". Licentiate thesis, KTH, Signalbehandling, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11678.
Texto completoRadio frequency (RF) power amplifiers (PA) are still the most troublesomepart of a wireless system due to their inherent nonlinearity, low powerefficiency and high distortions. Better tools are needed to understand and correct the undesirable behavior. Some of these tools are behavioral models. A behavioral model is often thought of as a black box with some inputs andsome outputs. In the case here these inputs are sampled signals which meansthat the modeling amounts to finding a mathematical relationship betweenthe input signal(s) and the output signal(s). This thesis considers some requirements for behavioral modeling of said systems by presenting methods for general performance evaluation and improvement by considering a frequency weighted error criterion. A high performance measurement system is also needed. The performance of the available system is compared to the performance of a well recognized system, the largesignal network analyzer (LSNA). The results show that the existing measurementsystem can extract behavioral models with the same performance as the LSNA and can give lower performance validation errors. Still the need for higher bandwidths drives the measurement systems to the limits, especially the digital parts. By utilizing the so called Zhu-Frank generalized sampling theorem, behavioral modeling of a PA is done by using data acquired at a sampling rate lower than the Nyquist rate. Models of a PA are extracted and the performance is evaluated using the normalized meansquare error (NMSE) criterion. For prediction and correction of the output signals the stability of the models regarding changes must be investigated. One such study considering controlled variations on the output load of the PA is done and both the predictive and corrective capabilities of the models are evaluated. The predictive capability gets up to 7 dB worse measured as adjacent channel error powerratio (ACEPR) and the corrective, as digital predistortion, gets up to 13 dB worse measured as adjacent channel power ratio (ACPR).
Kim, Daeyoung. "Propagation measurements and system design for long-range RF tags". Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/13876.
Texto completoNader, Charles. "Signal Shaping and Sampling-based Measurement Techniques for Improved Radio Frequency Systems". Doctoral thesis, KTH, Signalbehandling, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-95404.
Texto completoTrådlösa kommunikationssystem förekommer överallt i vår vardag, med höga förväntningar på kapacitet, tillförlitlighet och energieffektivitet. För att uppfylla förväntningar på kapacitet och tillförlitlighet är dagens trådlösa system utrustade med avancerade modulationsmetoder, såsom Orthogonal Frequency Division Multiplexing (OFDM), vilket medför att dagens trådlösa signaler har stora bandbredder och höga toppfaktorer. Därutöver planeras det för att olika trådlösa system/standarder kommer att samexistera och samutnyttja komponenter i gränssnittet mot radiosignaler, s.k. RF front-end, för att därigenom minska kostnader för nätverk. Egenskaperna hos dessa signaler och samexisterande system ställer höga krav på förstärkarsteg som i bästa fall kan anses svagt olinjära. Som ett resultat av detta behöver effektförstärkaren arbetspunkt flyttas för förstärkaren skall arbeta i det linjära området, men en sådan förflyttning minskar systemets verkningsgrad. Genom att reducera toppfaktorn på den trådlösa signalen samt att linjärisera förstärkarsteget genom digital förförvrängning, även kallad predistortion, hos effektförstärkaren när den drivs nära sin högsta tillåtna arbetspunkt för en kontinuerlig signal (CW) kan optimal linjäritet och effektiv drift erhållas. För att uppnå god linjäriseringsprestanda krävs noggranna modeller som beskriver beteende i basbandet. Att ta fram dessa modeller kräver tidsdomänmätningar av signaler vars spektra är bredbandiga, till stor del beroende på icke-linjär drift av effektförstärkaren. Bredbandiga spektra ställer höga krav på dagens samplande mätsystem i och med kompromissen mellan samplingsfrekvens och upplösning i amplitud finns i dagens generation av analog till digital omvandlare; dessutom finns en begränsning i tillgänglig analog bandbredd. Att lösa dessa utmanande mätproblem kan leda till utformning av dyra mätsystem vilket inte är önskvärt. I denna avhandling förbättras prestandan hos en radiosändare genom en kombination av smart toppfaktorreduktion och förbättrad digital predistortionsteknik som gör det möjligt att driva effektförstärkaren nära sin 1 dB kompressionspunkt, vilket erbjuder en betydande ökning av systemets verkningsgrad samtidigt som det uppfyller standarders krav avseende vektornoggrannhet och spektral spridning. Dessutom har prestandan på mätutrustningen för radiofrekvenser (RF) förbättras genom att minska kraven på digital bandbredd med hjälp av en nyutvecklad harmonisk samplingsteknik, och genom att minska kraven på den analoga bandbredden och konstruktionskostnad med hjälp av en teknik att intersekvensera signaler i den digitala frekvensdomänen samt med en signalseparationsteknik baserad på en avancerad rekonstruktionsmetod för glesa signaler.
QC 20120605
Ramamoorthy, Suresh. "Measurement of energy consumption in Wireless LANs and Radio Frequency Identification systems". Thesis, Wichita State University, 2011. http://hdl.handle.net/10057/5030.
Texto completoThesis (M.S.)--Wichita State University, College of Engineering, Dept. of Electrical Engineering and Computer Science.
Whitney, John Peter 1982. "Measurement of radio-frequency magnetic fluctuations in the VTF magnetic reconnection experiment". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/32751.
Texto completoIncludes bibliographical references (p. 30).
In this thesis work, I designed, fabricated, and calibrated, a radio-frequency magnetic probe, subsequently used to measure magnetic turbulance in the reconnecting plasmas of the Versatile Toroidal Facility (VTF). Reconnecting Hydrogen plasmas were created, and magnetic fluctuations in all three artesian directions were measured in the 1-101)MHz range. A preliminary hodogram analysis of the fluctuation spectra found the propagation direction of low-frequency (1-5MHz) electromagnetic waves to be parallel to the direction of the plasma current, while high-frequency waves had a random distribution of propagation directions.
by John Peter Whitney.
S.B.
Zenteno, Efrain. "Vector Measurements for Wireless Network Devices". Licentiate thesis, KTH, Signalbehandling, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-111863.
Texto completoQC 20130204
Nguyen, Anh Tuan. "Microwave photonic signal processing utilising recirculating delay line structure". Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/11736.
Texto completoAdegoke, Elijah. "Radio frequency channel characterization for energy harvesting in factory environments". Thesis, Loughborough University, 2018. https://dspace.lboro.ac.uk/2134/33412.
Texto completoPetrin, Allen John. "Maximizing the Utility of Radio Spectrum: Broadband Spectrum Measurements and Occupancy Model for Use by Cognitive Radio". Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-07152005-135311/.
Texto completoDr. Stevenson J. Kenney, Committee Member ; Dr. Paul G. Steffes, Committee Chair ; Dr. Gregory D. Durgin, Committee Member ; Dr. Aaron D. Lanterman, Committee Member ; Dr. Robert G. Roper, Committee Member.
Vlach, Philip Thomas. "Measurement, prediction and analysis of the radio frequency electromagnetic environment outside and inside hospitals". Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26436.
Texto completoMeasurements were also used to analyze signal propagation characteristics inside buildings due to INTERNAL SOURCES operating at 433, 861, and 1705 MHz. Cross-floor propagation paths, where multiple floors and walls were traversed, showed fields were independent of the transmitter-receiver separation distance. Signals measured for a separation of one floor were higher than same-floor signal levels.
Rutschlin, Marc. "The non-destructive measurement of the radio frequency properties of hard rock borehole cores". Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50504.
Texto completoENGLISH ABSTRACT: The effective use of borehole radar in geophysical exploration requires accurate knowledge of the dielectric properties of the geological system in which it is employed. The attenuation and propagation velocity of pulses through rock must be known in order to plan and interpret experimental data. Conventional destructive methods for the measurement of hard rock cores require the careful preparation of samples. This firstly necessitates the selection of sampling position and the resulting estimation of rock properties based on sparse measurements, and secondly results in the loss of material and thus data. The ready availability of cylindrical borehole core samples invites the use of a nondestructive means of measuring their properties. A novel design for a flexible guarded capacitor which conforms to a core's cylindrical surface is presented here. T he proposed device has numerous advantages over previous methods. No material is lost to sample preparation and a detailed characterisation of the entire core, including inclusions and transitions between rock types, may be performed. A detailed methodology for the rapid construction of a robust capacitor is given. Guidelines for its operation to achieve repeatable and accurate measurements of the complex dielectric constant of samples of varying homogeneity in the 1- 25 MHz frequency range are presented. The increased amount of data collected from complete core samples is analysed statistically, and amongst other things allows the estimation of the rock's homogeneity. Comparisons of the dielectric properties measured in the laboratory to propagation velocity estimates obtained from crosshole borehole shoots show that a more homogeneous sample is a better predictor of bulk propagating conditions. Detailed studies of the dielectric properties of economically important diamondiferous and platiniferous geological systems show that borehole radar is a feasible tool for the high resolution delineation of ore bodies and other geological targets.
AFRIKAANSE OPSOMMING: Die effektiewe gebruik van boorgatradar in geofisiese eksplorasie benodig akkurate kennis van die dielektriese eienskappe van die geologiese sisteme waarin dit gebruik word. Kennis van die verswakking en voortplantingsnelheid van pulse deur die rots word benodig om eksperimente te beplan en gemete data te interpret eer. Vir konvensionele destruktiewe meetmetodes van harde rotskerne is noukeurige voorbereiding van monsters noodsaaklik. Hierdie proses vereis eerstens 'n keuse van meetposisies en die afskatting van rotseienskappe gebaseer op verspreide metings, en lei tweedens tot die verlies van materiaal en dus data. Die beskikbaarheid van silindriese bom·gat kernmonsters maak dit moontlik om die kerneienskappe op n nie-destruktiewe manier te meet. Die ontwerp van 'n nuwe buigbare afgeskermde kapasitor wat op 'n silindriese kernoppervlak pas, word hier voorgestel. Die toestel het verskeie voordele bo huidige metodes. Geen materiaal word gedurende monstervoorbereiding verloor nie, en 'n volledige beskywing van die eienskappe van die hele kern , met insluitings en oorgange tussen rotstipes, kan verkry word. 'n Gedetaileerde prosedure vir die vinnige konstruksie van 'n robuuste kapasitor word gegee. Die gebruik van die toestel vir herhaalbare en akkurate metings van die komplekse dielektriese konstante van verskillend homogene monsters in die 1- 25 MHz frekwensie bereik word beskryf. Die groter hoeveelheid data wat deur middel van hierdie metode van hele kernmonsters verkry kan word , word statisties geanaliseer, en laat onder andere 'n skatting van die rots se homogeniteit toe. Vergelykings van laboratoriumgemete rotseienskappe met veldskattings van voortplant ingsnelhede wys dat 'n meer homogene monster tot 'n beter afskatting van werklike voortplantingstoestande lei. Studies van die dielektriese eienskappe van ekonomies belangrike diamanthoudende en platinumryk geologiese sisteme wys dat boorgatradar geskik is vir hoe resolusie uitkenning van ertsligame en ander geologiese teikens.
Angelotti, Alberto Maria <1992>. "Measurement techniques for the characterization of radio frequency gallium nitride devices and power amplifiers". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amsdottorato.unibo.it/9834/1/Main.pdf.
Texto completoRousseau, Moshe. "A broad-band compact range for radio frequency electromagnetic susceptibility and emission measurements". Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254199.
Texto completoRoig, Gema. "ON DVB-H RADIO FREQUENCY PLANNING: : ADJUSTMENT OF A PROPAGATION MODEL THROUGH MEASUREMENT CAMPAIGN RESULTS". Thesis, University of Gävle, Department of Technology and Built Environment, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-540.
Texto completoThe present Master Thesis analyzes the DVB-H radio Frequency Network Planning
problematic, studying the influence of a propagation model used in the calculation of
network coverage. In this way, the aim of this work is the design of a procedure and
algorithm to adjust a propagation model considering measurement campaigns performed in
different environments (dense-urban, urban, sub-urban and rural).
The methodology relies on the adjustment of the Xia-Bertoni propagation model
parameters using the Least Mean Square (LMS) method, considering the collected
measurements and the simulation model parameters obtained from a Geographic
Information System (GIS). Coverage simulations and measurement results are compared
using a 3-Dimensional city model (terrain and buildings) for different terrain topologies
(flat, hills and canyons) and environments.
The resulting adjusted model has been tested and compared with other common
models (COST231 and Okumura-Hata) using specific metrics, thus proving its validity for
different frequencies, environments and terrain topologies. In order to validate the
procedure and designed algorithm, this Master Thesis gathers real data from measurement
campaigns carried out in different cities: Gävle (Sweden), Bucaramanga (Colombia),
Valencia (Spain) and Munich (Germany). Besides, this work provides an insight on best
practices to perform measurement campaigns.
The outcome of this work is a useful tool in radio network planning for DVB-H
systems, which ensures reliable results in all environments and terrain topologies.
Gross, Eugene Joseph 1960. "OPTICAL MAGNETIC FIELD PROBE WITH LIGHT EMITTING DIODE SENSOR (RADIO FREQUENCY, FARADAY'S LAW, INCANDESCENT, TEMPERATURE COMPENSATION, INDUCTRON)". Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/276393.
Texto completoWei, Xiaoyun Niu Guofu. "On-wafer S-parameter measurement using four-port technique and intermodulation linearity of RF CMOS". Auburn, Ala, 2008. http://hdl.handle.net/10415/1448.
Texto completoChen, Youjie. "Micro Assembly for Radio Frequency Electronics : Characterization of Bond Wires". Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-257875.
Texto completoPå grund av det ökande antalet komponenter i radiofrekvensdesign, integration och förpackning blivit ett viktigt ämne för att utveckla energieffektiva och kostnadseffektiva lösningar. Sammankopplingar är en nyckelfaktor i ett sådant ämne, eftersom de är starkt används i radiofrekvensteknik. Bland dem, bondtrådar är en av de vanligaste.Det är viktigt att förstå och modellera beteendet hos varje komponent. Därför hur att noggrant modellera och karakterisera bondtrådarna blir ett värdefullt problem, och dessutom, hur de fysiska dimensionerna påverkar överföringsprestanda.Projektet har byggt bondtrådsmodeller i Matlab och i elektromagnetiska simulatorer NI AWR och ANSYS HFSS. De faktiska teststrukturerna tillverkas också med hjälp av bindningsmaskinen och mäts av vektornätverksanalysatorn. Den föreslagna analysmodellen för bindningstrådar är giltig efter att ha jämfört dess resultat med dem från simulering och mätning. Dessutom studeras effekten av slinghöjden och separationsavståndet på transmissionens prestanda och har en väl verifierad slutsats.
Yılmazer, Şafak Enes. "Integrated Coverage Measurement and Analysis System for Outdoor Coverage WLAN". Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2185.
Texto completoMcCormick, Jackson C. "Spatial and temporal ionospheric monitoring using broadband sferic measurements". Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54469.
Texto completoGueye, Serigne Bira. "Electron-Radio-Frequency Quadrupole (ERFQ) linear accelerator: theory, design and measurements for the GHz region". [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980255554.
Texto completoJacobs, Brett William. "Phase-resolved measurements of ion dynamics in radio frequency plasma sheaths by laser-induced fluorescence". Diss., Restricted to subscribing institutions, 2010. http://proquest.umi.com/pqdweb?did=2023768081&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Texto completoHarle, Thomas. "Radio frequency plasma thrusters : performance evaluation of low magnetic field mode operation through direct thrust measurements". Thesis, University of Surrey, 2015. http://epubs.surrey.ac.uk/807990/.
Texto completoHodge, James W. "A comparison between power line noise level field measurements and man-made radio noise prediction curves in the high frequency radio band". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA306572.
Texto completoOverstreet, William Patton. "VHF bipolar transistor power amplifiers: measurement, modeling, and design". Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/71166.
Texto completoPh. D.
Andrews, Mark Joseph. "Design Considerations for 500-2000 MHz Ultra-Wideband Radiometric Measurements". The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1618312655065238.
Texto completoSomasundaram, Meena Sivalingam. "Pulsed power and load-pull measurements for microwave transistors". [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0003293.
Texto completoHussaini, Abubakar S. "Energy efficient radio frequency system design for mobile WiMax applications. Modelling, optimisation and measurement of radio frequency power amplifier covering WiMax bandwidth based on the combination of class AB, class B, and C operations". Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5749.
Texto completoHussaini, Abubakar Sadiq. "Energy efficient radio frequency system design for mobile WiMax applications : modelling, optimisation and measurement of radio frequency power amplifier covering WiMax bandwidth based on the combination of class AB, class B, and C operations". Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5749.
Texto completoWiid, P. Gideon. "Lightning protection and radio frequency interference mitigation for the Karoo Array Telescope". Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4009.
Texto completoENGLISH ABSTRACT: South Africa and Australia are now the two remaining countries bidding for the Square Kilometre Array (SKA), the biggest and most sensitive project ever undertaken in radio astronomy. The South African SKA is demonstrating its technology capabilities through the Karoo Array Telescope (KAT or MeerKAT). The development of KAT is taking place in stages to optimise design and minimise risks at each stage. An array of seven 12 m antennas will be complete by the end of 2009, called KAT-7. The following phase will see the construction of MeerKAT, which will lead to eighty arrayed dishes. Lightning and RFI studies for KAT-7 are the focus of this dissertation. Due to the extent and complexity of the South African demonstrator project, these studies have largely been conducted on a single structure. Parameters for the dish antenna and pedestal design changed throughout their development. To be effective, the doctoral research had to track these changes appropriately. A Method of Moments frequency domain computational electromagnetic code, FEKO, is used throughout the study. The consequences of direct and indirect lightning strikes are examined for the KAT-7 structure. Important FEKO model verification is achieved through measurement of physical scale models in an anechoic chamber. The microwave simulation code, CST, gives direct comparison of FEKO results by using a finite volume time domain method of calculation. Using frequency domain analysis on these models, the lightning down conductor design over the dish antenna bearings is optimised with cost-effectiveness as one driving parameter. RFI coupling levels for different designs are compared to each other to identify areas requiring RFI mitigation. Analysis of resonances enables evaluation of the mitigation at frequencies sensitive to radio astronomy. A Sommerfeld integral ground plane is used together with the computational model to investigate the use of the concrete foundation steel reinforcing as part of the lightning earthing electrode system. Different interconnections of the steel reinforcing elements are critically evaluated. The KAT-7 design incorporated clear lightning protection and RFI mitigation policies derived from recommendations contained within this dissertation.
AFRIKAANSE OPSOMMING: Suid-Afrika en Australie is nou die oorblywende twee lande wat bie vir die Vierkante Kilometer Reeks (SKA), die grootste en mees sensitiewe projek nog ooit in radio astronomie onderneem. Die Suid Afrikaanse SKA demonstreer sy tegnologiese bekwaamheid met die Karoo Reeks Teleskoop (KAT of MeerKAT). Die ontwikkeling van KAT vind plaas in fases om die ontwerp te optimaliseer en risikos te minimaliseer met elke fase. ’n Reeks van sewe 12 m antennas, genaamd KAT-7, sal teen die einde van 2009 klaar wees. Die volgende fase behels die konstruksie van MeerKAT, wat sal lei tot ’n tagtig-skottel reeks. Die fokus van hierdie proefskrif hanteer weerlig en radiofrekwensie steurings (RFS) vir KAT-7. As gevolg van die omvang en kompleksiteit van die Suid-Afrikaanse demonstreerder projek, is die studies hoofsaaklik op een struktuur gedoen. Parameters vir die antenna-skottel en -voetstuk ontwerp het met hul ontwikkeling deurgaans verander. Om effektief te wees, moes die doktorale navorsing hierdie veranderinge toepaslik volg. ’n Metode-van-Momente frekwensiedomein rekenaar elektromagnetiese kode, FEKO, is deurgaans met die studie gebruik. Die gevolge van direkte en indirekte weerligslae vir die KAT-7 struktuur is ondersoek. Belangrike FEKO model bevestiging is bereik met metings van skaalmodelle in ’n anego¨ıse kamer. Die mikrogolf-simulasie kode, CST, gee ’n direkte vergelyking met die FEKO resultate deur ’n eindige-volume-tyd-domein metode van berekening te gebruik. Met behulp van frekwensiedomein analise van hierdie modelle, is die weerligafleierontwerp oor die antenna-skottel laers ge-optimaliseer, met koste-effektiwiteit as een van die drywingsparameters. RFS koppelingsvlakke vir onderskeie ontwerpe is teen mekaar opgeweeg om areas te identifiseer wat RFS tempering benodig. Analise van resonansies stel die evaluering van die tempering in staat teen frekwensies wat sensitief is vir radio astronomie. ’n Sommerfeld integrale grondvlak word saam met die rekenaarmodel gebruik om die insluiting van die beton se staalversterking as deel van die aardingselektrodestelsel te ondersoek. Verskillende bindmetodes van die onderlinge staalversterkingselemente word krities ge¨evalueer. Die KAT-7 ontwerp inkorporeer duidelike weerligbeveiligings- en RFS temperingstrategie ¨e, komende van aanbevelings in hierdie proefskrif omskryf
Pamuk, Gokhan. "Design And Realization Of Broadband Instantaneous Frequency Discriminator". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12612044/index.pdf.
Texto completo18 GHz frequency band is designed, simulated and partially realized. The designed structure uses one coarse tier, three medium tiers and one fine tier for frequency discrimination. A novel reflective phase shifting technique is developed which enables the design of very wideband phase shifters using stepped cascaded transmission lines. Compared to the classical phase shifters using coupled transmission lines, the new approach came out to be much easier to design and fabricate with much better responses. This phase shifting technique is used in coarse and medium tiers. In fine frequency measurement tier, I/Q discriminator approach is used because reflective phase shifters would necessitate unacceptably long delay lines. Two I/Q discriminators are designed and fabricated using Lange directional couplers that operate in 2-6 GHz and 6-18 GHz, resulting in satisfactory response. Additionally, 6 GHz HP and 6 GHz LP distributed filters are designed and fabricated to be used for these I/Q discriminators in fine tier. In order to eliminate possible ambiguities in coarse tier, a distributed element LP-HP diplexer with 10 GHz crossover frequency is designed and fabricated successfully to be used for splitting the frequency spectrum into 2-10 GHz and 10-18 GHz to ease the design and realization problems. Three power dividers operating in the ranges 2-18 GHz, 2-6 GHz and 6-18 GHz are designed for splitting incoming signals into different branches. All of these dividers are also fabricated with satisfactory response. The fabricated components are all compact and highly reproducible. The designed IFM can tolerate 48 degrees phase margin for resolving ambiguity in the tiers while special precautions are taken in fine tier to help ambiguity resolving process also. The resulting IFM provides a frequency resolution below 1 MHz in case of using an 8-bit sampler with a frequency accuracy of 0.28 MHz rms for 0 dB input SNR and 20 MHz video bandwidth.
Oliver, Matthew. "Density, temperature and magnetic field measurements in low density plasmas". Thesis, University of Oxford, 2018. http://ora.ox.ac.uk/objects/uuid:df217453-1e10-4684-beb7-83c1bcecf285.
Texto completoAli, Ammar H. A. "Design and Implementation of Radio Frequency Power Feeding Networks for Antenna Array Applications: Simulation and Measurements of Multiport, Equal and Unequal, Fixed and Reconfigurable Radio Frequency Power Feeding Networks for Narrow and Ultra-Wideband Applications". Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/17447.
Texto completoHigher Committee for Education Development (HCED), Iraq
Joshi, Sujay S. "Multi-Target Tracking via Nonlinear Least Squares Using Doppler Measurements from a Passive Radar System". Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14576.
Texto completoOxtoby, Neil Paul. "Keeping it real': A Quantum Trajectory Approach to Realistic Measurement of Solid-State Quantum Systems". Thesis, Griffith University, 2007. http://hdl.handle.net/10072/365770.
Texto completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Science
Full Text
Tiesler, Hanne [Verfasser], Tobias [Akademischer Betreuer] Preußer y Christof [Akademischer Betreuer] Büskens. "Identification of Material Parameters from Temperature Measurements in Radio Frequency Ablation / Hanne Tiesler. Gutachter: Tobias Preußer ; Christof Büskens. Betreuer: Tobias Preußer". Bremen : Staats- und Universitätsbibliothek Bremen, 2011. http://d-nb.info/107189823X/34.
Texto completoZemba, Michael J. "Site Characterization of Phase Instability via Interferometer Measurement". University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1383565461.
Texto completoCOSOLI, GLORIA. "Study and development of a novel radio frequency electromedical device for the treatment of peri-implantitis: experimental performance analysis, modelling of the electromagnetic interaction with tissues and in vitro and in vivo evaluation". Doctoral thesis, Università Politecnica delle Marche, 2017. http://hdl.handle.net/11566/245278.
Texto completoPeri-implantitis is a severe disease affecting hard and soft peri-implant tissues. At present, prevention is the only means to contrast it. Recently, a therapy based on the administration of radio frequency electric current was experimented (success rate: 81%). The treatment was numerically simulated, providing the electric current (EC) and field (EF) distributions in peri-implant tissues: the anti-inflammatory effect can be associated to EC, the bone regeneration to the EF. Bioimpedance measurements (BM) were investigated to detect inflammation; changes in the measured impedance modulus are equal to 4-20% (depending on different parameters) from numerical results, also more evident experimentally (35% inflammation, 56% peri-implantitis). So, BM could allow to detect the tissue to be treated. To evaluate the repeatability, natural tooth roots were numerically and experimentally measured; the order of magnitude is the same (some kΩ), even if there are differences probably due to the measurement conditions. Intra-subject variability was of 10% in the same day, but up to 26% in different days; inter-subject variability was higher. The electrical safety was accurately taken into account. The applicable directives were individuated (IEC 60601-1, 60601-1-2 and 60601-2-2). In vitro tests were carried out to evaluate the effect of the therapy on cell vitality: there is not a significant increase in necrosis (vitality: 85% tests, 94% controls), the main negative effect is apoptosis. Possible thermal effects were numerically investigated: no dangerous tissue heating was observed. A new device for the peri-implantitis treatment, PeriCare®, was designed, with diagnostic (BM) and therapeutic parts. Proper electrodes are being designed and the prototype is being realized. The technical file is being compiled and the conformity verification tests are being planned towards the certification process. Hopefully, the medical device will be placed into the market within this year.
Kukshya, Vikas. "Wideband Terrestrial Path Loss Measurement Results For Characterization of Pico-cell Radio Links at 38 GHz and 60 GHz Bands of Frequencies". Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/33669.
Texto completoMaster of Science
Reissig, Alexander. "Evaluation of on-line cell viability and L-lactate measurements in soft sensor for mammalian cell cultures". Thesis, Linköpings universitet, Teknisk biologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-112918.
Texto completoGhazaany, Tahereh S. "Design and implementation of adaptive baseband predistorter for OFDM nonlinear transmitter. Simulation and measurement of OFDM transmitter in presence of RF high power amplifier nonlinear distortion and the development of adaptive digital predistorters based on Hammerstein approach". Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5680.
Texto completoHlaváč, Štěpán. "Vysokofrekvenční měřič výkonu". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220258.
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