Дисертації з теми "Co-fired ceramics"
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Lim, Hui Fern Michele. "Low Temperature Co-fired Ceramics Technology for Power Magnetics Integration." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/30156.
Повний текст джерелаPh. D.
Shafique, Muhammad Farhan. "Laser Prototyping of Low Temperature Co-fired Ceramics for System-In-Package Applications." Thesis, University of Leeds, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521480.
Повний текст джерелаBhutani, Akanksha [Verfasser]. "Low Temperature Co-fired Ceramics for System-in-Package Applications at 122 GHz / Akanksha Bhutani." Karlsruhe : KIT Scientific Publishing, 2019. http://d-nb.info/1196294542/34.
Повний текст джерелаZhang, Wenli. "HIGH PERFORMANCE PIEZOELECTRIC MATERIALS AND DEVICES FOR MULTILAYER LOW TEMPERATURE CO-FIRED CERAMIC BASED MICROFLUIDIC SYSTEMS." UKnowledge, 2011. http://uknowledge.uky.edu/gradschool_diss/200.
Повний текст джерелаLuo, Jin. "The Development and Biocompatibility of Low Temperature Co-Fired Ceramic (LTCC) for Microfluidic and Biosensor Applications." UKnowledge, 2014. http://uknowledge.uky.edu/cme_etds/30.
Повний текст джерелаAhyoune, Saiyd. "Heterogeneous Integration of RF and Microwave Systems Using Multi-layer Low-Temperature Co-fired Ceramics Technology." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/459117.
Повний текст джерелаEl objetivo de este trabajo es el desarrollo de una metodología de modelado para el análisis rápido, pero sin comprometer la precisión de la solución, de componentes pasivos no radiativos de RF en substratos multicapa. El método se basa en el algoritmo numérico cuasi-estático de los elementos parciales de circuito equivalente (PEEC). Éste puede ser incorporado en simuladores de circuitos; por tanto, los modelos ya están disponibles en la entrada de esquemático de forma transparente para el diseñador de circuitos. Utilizando este marco, la escalabilidad del modelo se mejora en términos de la geometría, la definición del corte tecnológico, las propiedades del material, la topología del componente y las condiciones de contorno electro-magnéticas. Esta disertación comienza mostrando las motivaciones que han llevado a su desarrollo y la capacidad real del método de resolución obtenido. A partir de aquí, se realiza la descripción de todo el desarrollo del marco numérico que se divide en tres partes que están interrelacionadas. En primer lugar, la formulación PEEC se adapta según el comportamiento electromagnético real del componente. Vale la pena subrayar que en esta formulación se utiliza una perspectiva diferente a la habitual y que está relacionada con el principio de los trabajos virtuales de d’Alembert. La segunda parte trata de cómo se evalúan los elementos parciales y constituye el núcleo principal del algoritmo. Se lleva a cabo utilizando soluciones analíticas de la función de Green (GF) del sustrato en el dominio espacial. Los elementos parciales, que forman la malla numérica del modelo, se ensamblan en la matriz del sistema siguiendo un procedimiento de análisis nodal modificado (MNA). En la última parte, se discute la importancia de la malla sobre la precisión de la solución y se propone un generador de malla basado en la física del componente y no sólo en la descripción de la geometría. Como aplicación práctica de la metodología, se realiza la generación de una biblioteca de componentes pasivos RF para sustratos multicapa.
Mercke, William L. "Diagnosis of Systemic Inflammation Using Transendothelial Electrical Resistance and Low-Temperature Co-fired Ceramic Materials." UKnowledge, 2013. http://uknowledge.uky.edu/cme_etds/21.
Повний текст джерелаBhutani, Akanksha [Verfasser], and T. [Akademischer Betreuer] Zwick. "Low Temperature Co-fired Ceramics for System-in-Package Applications at 122 GHz / Akanksha Bhutani ; Betreuer: T. Zwick." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/119312719X/34.
Повний текст джерелаGilham, David Joel. "Packaging of a High Power Density Point of Load Converter." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/19325.
Повний текст джерелаOne issue with current converters is the large volume of the passive components. Increasing the switching frequency to the megahertz range is one way to reduce to volume of these components. The other way is to fundamentally change the way these inductors are designed. This work will explore the use of low temperature co-fired ceramic (LTCC) tapes in the magnetic design to allow a low profile planar inductor to be used as a substrate. LTCC tapes have excellent properties in the 1-10 MHz range that allow for a high permeability, low loss solution. These tapes are co-fired with a silver paste as the conductor. This paper looks at ways to reduce dc resistance in the inductor design through packaging methods which in turn allow for higher current operation and better heavy load efficiency. Fundamental limits for LTCC technologies are pushed past their limits during this work. This work also explores fabrication of LTCC inductors using two theoretical ideas: vertical flux and lateral flux. Issues are presented and methods are conceived for both types of designs. The lateral flux inductor gives much better inductance density which results in a much thinner design.
It is found that the active devices must be shielded from the magnetic substrate interference so active layer designs are discussed. Alumina and Aluminum Nitride substrates are used to form a complete 3D integration scheme that gives excellent thermal management even in natural convection. This work discusses the use of a stacked power technique which embeds the devices in the substrate to give double sided cooling capabilities. This fabrication goes away from traditional photoresist and solder-masking techniques and simplifies the entire process so that it can be transferred to industry. Time consuming sputtering and electroplating processes are removed and replaced by a direct bonded copper substrate which can have up to 8 mil thick copper layers allowing for even greater thermal capability in the substrate. The result is small footprint and volume with a power density 3X greater than any commercial product with comparable output currents. A two phase coupled inductor version using stacked power is also presented to achieve even higher power density.
As better device technologies come to the marketplace, higher power density designs can be achieved. This paper will introduce a 3D integration design that includes the use of Gallium Nitride devices. Gallium Nitride is rapidly becoming the popular device for high frequency designs due to its high electron mobility properties compared to silicon. This allows for lower switching losses and thus better thermal characteristics at high frequency. The knowledge learned from the stacked power processes gives insight into creating a small footprint, high current ceramic substrate design. A 3D integrated design is presented using GaN devices along with a lateral flux inductor. Shielded and Non-Shielded power loop designs are compared to show the effect on overall converter efficiency. Thermal designs and comparisons to PCB are made using thermal imaging. The result is a footprint reduction of 40% from previous designs and power densities reaching close to 900W/in3.
Master of Science
Li, Qiang. "Low-Profile Magnetic Integration for High-Frequency Point-of-Load Converter." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/28637.
Повний текст джерелаPh. D.
Chen, M. Y. (Mei-Yu). "Ultra-low sintering temperature glass ceramic compositions based on bismuth-zinc borosilicate glass." Doctoral thesis, Oulun yliopisto, 2017. http://urn.fi/urn:isbn:9789526215600.
Повний текст джерелаTiivistelmä Väitöstyön ensimmäisessä osassa tutkittiin ja kehitettiin uudentyyppisiä, ultramatalissa sintrauslämpötiloissa (ULTCC) valmistettuja lasi-keraami komposiitteja käyttäen vismuttisinkkiborosilikaatti -pohjaista lasia (BBSZ). Täyteaineina olivat alumiinioksidi (Al2O3) ja bariumtitanaatti (BaTiO3). Materiaaleille saatiin riittävän suuren lasipitoisuuden avulla tiheät mikrorakenteet ja sovelluskelpoiset dielektriset ominaisuudet. BaTiO3:n komposiitti, joka sisälsi 70 p-% BBSZ lasia, saavutti 450 °C lämpötilassa sintrattuna korkeimman suhteellisen permittiivisyyden: εr=132 (@100 kHz) ja εr=207 (@100 MHz). Komposiittien dielektrisiä ominaisuuksia määrittivät tällöin lasi-, BaTiO3- ja Bi24Si2O40- faasien ominaisuudet ja erityisesti Bi24Si2O40 -faasi näytteissä, joissa on 70-90 p-% lasia. Sekundäärinen faasi Bi24Si2O40 ei välttämättä heikentänyt, vaan jopa paransi dielektrisiä ominaisuuksia. Vastaavilla Al2O3-BBSZ –komposiiteilla saavutettiin samanlaisia tuloksia tihentymisen, mikrorakenteiden ja faasien (Al2O3, BBSZ, Bi24Si2O40) suhteen. Lisäksi tässä tapauksessa saavutetut dielektriset ominaisuudet voidaan selittää näiden kolmen faasin yhdistelmän olemassaololla. Väitöstyön toinen osa käsitteli pääasiassa eritavoin lämpökäsiteltyjä BaTiO3:n komposiitteja, joissa on 50 p-% BBSZ-lasia. Näillä saavutettiin tiheä mikrorakenne sintrattaessa 720 °C lämpötilassa ja havaitiin Bi4BaTi4O15-, Bi24Si2O40-faasien muodostuminen BaTiO3 lähtöfaasin rinnalle. Tulokset osoittivat myös, että lasijauheen partikkelikoko ei vaikuttanut sintrattujen näytteiden dielektrisiin ominaisuuksiin (εr = 263-267, tan δ = 0.013 (@100 kHz)). LiF -lisäys sen sijaan heikensi dielektrisiä ominaisuuksia ja vähensi Bi4BaTi4O15 faasin muodostumista. Tämä aiheutui Bi4BaTi4O15-faasin ominaisuuksista ja oli riippuvainen kyseisen faasin määrästä. Nämä tulokset osoittivat BBSZ -pohjaisten komposiittien käytettävyyden myös korkeampien sintrauslämpötilojen teknologioihin. Viimeisenä kehitettiin uudentyyppinen sideainesysteemi, joka mahdollistaa ultramatalien keraamien yhteissintraamisen jopa noin 300 °C lämpötilassa. Hyödyntäen kehitettyä sideainesysteemiä monikerrosrakenne, jossa käytettiin dielektrisiä BaTiO3-BBSZ- ja Al2O3-BBSZ-komposiitteja ja hopeaelektrodeja, yhteissintrattiin 450 °C lämpötilassa. Valmistetuissa rakenteissa ei havaittu murtumia eikä diffuusioita. Tulokset osoittavat, että kehitetyt lasi-keraami komposiitit mahdollistavat ympäristöystävällisten ULTCC -materiaalien valmistuksen. Lisäksi osoitettiin kehitettyjen materiaalien soveltuvuus monikerroksisten rakenteiden käyttöön monimateriaali-3D-elektroniikan pakkauksissa ja suurtaajuuskomponteissa
Suarez, Willian Toito. "Desenvolvimento de procedimentos em fluxo envolvendo reatores em fase sólida e microssistema analítico construído com LTCC (Low Temperature Co-fired Ceramics) para a determinação de analitos de interesse farmacêutico." Universidade Federal de São Carlos, 2009. https://repositorio.ufscar.br/handle/ufscar/6111.
Повний текст джерелаUniversidade Federal de Sao Carlos
The employment of flow injection systems to determination of N-acetylcysteine, captopril, dipyrone and fluoxetine hydrochloride in pharmaceutical formulations was investigated. The N-acetylcysteine was determinated employing a solid-phase reactor containing Zn3(PO4)2 immobilized in a polyester resin coupled to a flow injection system. The procedure was based on the chelation of Zn(II) ions with N-acetylcysteine in the solid-phase reactor, with consequent releasing of the complex Zn(II)-N-acetylcysteine of the reactor, this complex reacted with alizarin red S (VA) in borate buffer pH 9.0 generating the complex Zn(VA-BO3)3 which absorbance was measured spectrophotometrically at 540 nm. The second developed procedure was the determination of captopril (CAP) in pharmaceutical formulations employing a solid-phase reactor containing silver chrolanilate (Ag2C6Cl2O4) immobilized in a polyester resin. In this system occured the precipitation reaction of captopril with the Ag(I), producing in the reactor an insoluble salt between the CAP and the Ag(I) due to the lower solubility of the formed salt related to Ag2C6Cl2O4. After the formation of the insoluble salt in the reactor occured the releasing of chloranilate anion, C6Cl2O4 2-, that reacted with the Fe(III) producing the complex FeC6Cl2O4 + which was monitored spectrophotometrically at 528 nm. In another procedure, the N-acetylcysteine and captopril were determined separately in a flow injection system through the on-line of the Prussian blue formation. In this procedure, the N-acetylcysteine or the captopril were oxidized by Fe(III), producing Fe(II) that reacted with hexacyanoferrate(III) in a point of flow system, generating the Prussian blue (Fe4[Fe(CN)6]3), that was monitored spectrophotometrically at 700 nm. It was also proposed a flow injection system with merging zones and intermittent flow with turbidimetric detection to determination of fluoxetine hydrochloride in pharmaceuticals. This system was based on the formation of an insoluble salt (AgCl(s)) between the AgNO3 and the chloride of the hydrochloride of the fluoxetine molecule that was turbidimetrically detected at 420 nm. Finally, two procedures were developed employing a flow injection system to determination of dipyrone in pharmaceuticals using Fe(III) as chromogenic reagent. In the first procedure, it was employed an analytical microsystem constructed with LTCC and in the second one, it was used a flow injection system with merging zones without the use of microsystem. In these systems, occured the formation on-line of an blue chromophore between Fe(III) and the dipyrone that was monitored spectrophotometrically at 622 nm.
O emprego de sistemas de análise por injeção em fluxo para a determinação de N-acetilcisteína, captopril, dipirona e cloridrato de fluoxetina em formulações farmacêuticas foi investigado. A N-acetilcisteína foi determinada empregando um reator em fase sólida contendo fosfato de zinco imobilizado em resina poliéster acoplado ao sistema FIA. O procedimento baseou-se na complexação dos íons Zn(II) pela N-acetilcisteína no reator em fase sólida, com consequente remoção do complexo Zn(II)-N-acetilcisteína do reator, esse complexo reagiu com o regente vermelho de alizarina S (VA), em tampão borato pH 9,0, formando o complexo Zn(VA-BO3)3 cuja absorbância foi monitorada espectrofotometricamente em 540 nm. O segundo procedimento desenvolvido foi a determinação de captopril empregando um reator em fase sólida contendo cloranilato de prata (Ag2C6Cl2O4) imobilizado em resina poliéster. Esse sistema baseou-se na reação de precipitação do captopril com Ag(I), gerando no reator um sal insolúvel entre o captopril e Ag(I) devido à menor solubilidade do sal formado em relação ao Ag2C6Cl2O4. Após a formação do sal insolúvel no reator ocorreu o deslocamento do ânion cloranilato, C6Cl2O4 2-, que reagiu com o Fe(III) em um ponto de confluência do sistema em fluxo produzindo o complexo FeC6Cl2O4 + que foi monitorado espectrofotometricamente em 528 nm. Em um outro procedimento, a N-acetilcisteína e o captopril foram determinados separadamente em um sistema de análise por injeção em fluxo através da formação em linha do azul da Prússia. Nesse procedimento, a N-acetilcisteína ou o captopril foram oxidados pelo Fe(III), produzindo Fe(II) que reagiu com hexacianoferrato(III) em um ponto de confluência do sistema FIA, gerando o azul da Prússia (Fe4[Fe(CN)6]3), que foi monitorado espectrofotometricamente em 700 nm. Foi proposto também um sistema de análise por injeção em fluxo com zonas coalescentes e fluxo intermitente com detecção turbidimétrica para a determinação de cloridrato de fluoxetina em produtos farmacêuticos. O sistema baseou-se na reação entre o cloreto do cloridrato de fluoxetina e o nitrato de prata (AgNO3), formando o (AgCl(s)), que foi monitorado turbidimetricamente em 420 nm. Por último, foram desenvolvidos dois procedimentos empregando sistema de análise por injeção em fluxo para a determinação de dipirona em formulações farmacêuticas utilizando Fe(III) como reagente cromogênico. No primeiro procedimento foi empregado um microssistema analítico construído com LTCC e no segundo foi utilizado um sistema FIA com zonas coalescentes sem o acoplamento do microssistema. Nesses sistemas, sucedeu a formação em linha de um cromóforo azul, a partir da reação entre o Fe(III) e a dipirona, que foi monitorado espectrofotometricamente em 622 nm.
Tlili, Malika. "Modules intégrés en technologie LTCC pour des applications en bande D (110 - 170 GHz)." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2020. http://www.theses.fr/2020IMTA0165.
Повний текст джерелаThis thesis has as objective to realize low cost front-end TRX modules, in D-band (110-170 GHz), using MMIC chips integrated on an LTCC substrate. The applications at these frequencies are various: imaging (security) by deploying high-resolution scanners, automotive assistance radars, radiometry or the backhaul of the 5G telephony network. At very high frequencies, the packaging is generally made of metal structures, which makes it expensive, bulky and relatively long to manufacture. Packaging solutions based on LTCC technology have been proposed and developped during the thesis with the objective of maintaining the intrinsic performance of chips before integration. To integrate the MMIC chips on th LTCC support, various aspects have been studied and validated experimentally, with the difficulties in measurement inherent to these very high operating frequencies. These are in particular interconnection techniques for connecting the RF access pads of the chip to the pads on the subtrate and the thermal solution to limit the heating of certain chips, such as the power amplifier, which can cause a malfunction of even failure of the module. The establishement of th DC blasing networks of active chips is also a crucial point in the design of the packaging since they must not interferer with the RF accesses
Kosorín, Michal. "Výpočtové modelování porušení keramických částicových kompozitních materiálů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-418188.
Повний текст джерелаSvoboda, Josef. "Numerická simulace růstu trhliny v keramických kompozitních materiálech ve 3D." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318715.
Повний текст джерелаSobocinski, M. (Maciej). "Embedding of bulk piezoelectric structures in low temperature co-fired ceramic." Doctoral thesis, Oulun yliopisto, 2014. http://urn.fi/urn:isbn:9789526207049.
Повний текст джерелаTiivistelmä Curien veljekset havaitsivat pietsosähköisen ilmiön jo yli sata vuotta sitten. Ilmiöön liittyvä tutkimustieto ja erityisesti siihen perustuvien sovellusten määrä on nykyisin valtava. Uusissa pietsosähköisissä komponenteissa ja varsinkin niissä, jotka on tarkoitettu henkilökohtaisissa laitteissa käytettäviksi, muodot samoinkuin elektroniikapiirit voivat olla monimutkaisia. Siksi tarvitaan tarkoituksenmukaista ja hinnaltaan edullista laitteen pakkausmenetelmää. Hiljattain kehitetyt itseohjautuvat matalan lämpötilan yhteissintattavat keraamit (LTCC), joiden planaarinen kutistuma on lähes olematon, ovat lisänneet LTCC-teknologian sovellusmahdollisuuksia. Muotoon valmistetun sintraamattoman ja lopullisen sintratun keraamin dimensioiden yhtäsuuruus ei ole ainoastaan parantanut älykkäiden monikerrospakkausten suunnittelua, vaan mahdollistanut myös erilaisten materiaalien ja komponenttien upottamisen LTCC-rakenteisiin ja niiden yhteissintrauksen. Väitöstyössä esitetään uusi menetelmä pietsosähköisten bulkrakenteiden upottamiseksi saumattomasti LTCC-rakenteisiin yhteissintrauksella tai liimaliitoksella. Erityistä huomiota on kiinnitetty monivaiheiseen laminointiin ja sintrauksen jälkeiseen pietsosähköisten keraamien polarisointiin. Työssä on esitetty esimerkkejä useista rakenteista pietsosähköisten sovellusten pääalueilta osoituksena uuden tekniikan onnistuneesta käyttöönottamisesta nykyisessä valmistusympäristössä. Tutkittujen uusien rakenteiden ja muilla menetelmillä valmistettujen rakenteiden ominaisuuksia on verrattu keskenään. Pietsosähköisten bulkrakenteiden integroiminen yhteissintrauksella on uusi tekniikka, joka mahdollistaa lukuisia sovelluksia ja soveltuu massatuotantoon olemassa olevilla prosseintilaitteistoilla
Smarra, Devin A. "Low Temperature Co-Fired Ceramic (LTCC) Substrate for High Temperature Microelectronics." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1493386231571894.
Повний текст джерелаHu, T. (Tao). "BST-based low temperature co-fired ceramic (LTCC) modules for microwave tunable components." Doctoral thesis, University of Oulu, 2004. http://urn.fi/urn:isbn:9514272927.
Повний текст джерелаHo, Christopher M. (Christopher Mark). "Manufacturing operation modeling for product redesign : resistance analysis of low-temperature co-fired ceramic circuits." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36521.
Повний текст джерелаRathnayake-Arachchige, Dilshani. "Metallisation and structuring of low temperature Co-fired ceramic for micro and millimetre wave applications." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/19343.
Повний текст джерелаYucel, Ayse Tugce. "Modeling And Control Of High Temperature Oven For Low Temperature Co-fired Ceramic (ltcc) Device Manufacturing." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614918/index.pdf.
Повний текст джерелаC) are called Low Temperature Co-Fired Ceramics (LTCC). In this study, a comprehensive thermal model is described for the high temperature oven which belongs to a Low Temperature Co-fired Ceramic (LTCC) substance production line. The model includes detailed energy balances with conduction, convection and radiation heat transfer mechanisms, view factor derivations for the radiative terms, thermocouple balances, heating filaments and cooling mechanisms for the system. Research was conducted mainly on process development and production conditions along with the system modeling of oven. Temperature control was made in high temperature co-firing oven. Radiation View Factors for substrate and thermocouples are determined. View factors between substrate and top-bottom-sides of the oven are calculated, and then inserted into the energy balances. The same arrangement was made for 3 thermocouples at the bottom of the oven. Combination of both expressions gave the final model. Modeling studies were held with energy balance simulations on MATLAB. Data analysis and DOE study were held with JMP Software.
Fernandes, Joana Gonçalves. "Development and optimization of a Low Temperature Co-fired Ceramic suspension for Mask-Image-Projection-based Stereolithography." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/667478.
Повний текст джерелаEl objetivo principal de la tesis doctoral es el desarrollo y optimización de una suspensión cerámica fotocurable para la fabricación aditiva mediante la tecnología Mask-Image- Projection-Based Stereolithography (MIP-SLA), y la obtención de piezas cerámicas finales. Durante el proceso de impresión, el fotopolímero reacciona con la luz proyectada atrapando las partículas cerámicas en su matriz, lo cual posibilita la impresión de piezas cerámicas en verde (matriz polimérica y partículas cerámicas). Después del proceso de impresión es necesario eliminar la parte orgánica y realizar la sinterización de la pieza para la obtención de la pieza cerámica final. El material cerámico seleccionado para la formulación de la suspensión fotocurables ha sido un cerámico de baja temperatura de co-sinterización (Low Temperature Co-fired Ceramics, LTCC), para aplicaciones electrónicas. Para el desarrollo de la suspensión fotocurable de LTCC se ha teniendo en cuenta su comportamiento reológico y sus propiedades de fotopolimerización adecuadas a la tecnología de impresión. Una vez optimizada la suspensión cerámica, se han analizado el proceso de impresión y se ha optimizado el ciclo térmico, tanto de la etapa de quemado del polímero (debinding) como del proceso de sinterización para la densificación de la pieza cerámica final. Se ha logrado una formulación adecuada a la tecnología, la cual ha permitido la impresión de piezas en verde y posterior debinding y sinterizado de las piezas con geometrías complejas. Se demuestra también la posibilidad de impresión de piezas cerámicas con circuitos impresos de plata, lo cual abre camino para el desarrollo de la impresión híbrida de multimateriales.
Bhutani, Akanksha [Verfasser], and T. [Akademischer Betreuer] Zwick. "Low Temperature Co-fired Ceramic for System-in-Package Applications at 122 GHz / Akanksha Bhutani ; Betreuer: T. Zwick." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1192373545/34.
Повний текст джерелаKeezhanatham, Seshadri Jayashree. "Uniform Field Distribution Using Distributed Magnetic Structure." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/24820.
Повний текст джерелаMaster of Science
Jurásek, Matěj. "Studená chemická laminace keramiky s nízkou teplotou výpalu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-221030.
Повний текст джерелаSymerský, Tomáš. "Senzor pro měření průtoku." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219280.
Повний текст джерела曹淳凱. "Low temperature Co-fired ceramics of (MgCa)TiO3 microwave dielectiv materials." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/16921629125197175981.
Повний текст джерелаYANG, YOU-TING, and 楊侑庭. "Fabrication of LiNi0.5Ti0.5O2 low temperature co-fired ceramics with sintering aids." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/enft28.
Повний текст джерела國立高雄應用科技大學
電子工程系
105
This thesis investigated effects of sintering aids on the sintering behavior and microwave properties of LiN0.5Ti0.5O2(LNT) ceramics by the conventional solid-reaction route. LiN0.5Ti0.5O2 ceramic sintered at 1275 oC has good microwave properties. However, the sintering temperature is too high to be compatible with the low-temperature co-fire ceramics (LTCC) process. First, the CuO was added into LNT ceramics to act as the sintering aid. However, after the LNT ceramics with CuO were sintered at 925 oC, the relative density was only 71.5 % and many pores were observed in the LNT ceramic, which indicated that CuO did not form the liquid phase sintering to help the densification process. Hence, the CuO is not suitable to be a sintering aid for LNT ceramics. Then, ZnO was also added into LNT ceramics to be a sintering aid. However, ZnO also can not form the liquid phase sintering and hence the relative density of the LNT ceramic with ZnO sintered at 925 oC was only 67.64 %. Therefore, ZnO is still not suitable to be a sintering aid for the LNT ceramic. Finally, this study adopted V2O5 as the sintering aid. The V2O5 formed the liquid phase sintering with LNT ceramics. The LNT ceramic without a sintering aid sintered at 925 oC has the relative density of 68.45%. The relative density of the LNT ceramics increased with increasing the amount of V2O5. The LNT ceramic with 4 wt% V2O5 had the highest relative density of 97.31%. Then, the relative density decreased with larger V2O5 amount. The value also varied as the trend of relative density. Therefore, the value is influenced by amount of impurity and pores within the ceramics. The V2O5aid formed the liquid phase sintering in the LNT ceramics, which caused the densification process. Fewer pores within the LNT ceramics with V2O5 have higher values. The LNT ceramic with 4 wt% V2O5 sintered at 925 oC has an excellent microwave properties of =17.89, =20742 GHz, and = -29.93 ppm/℃. The LNT ceramic with 4 wt% V2O5 was alsoco-fired with 20 wt% Ag powders. No chemical reaction between the LNT ceramic and Ag powders was found, which indicates thatthe LNT ceramic with 4 wt% V2O5 is suitable for LTCC process.
Chen-YoKo and 柯承佑. "Fabrication of a low temperature co-fired ceramics electromagnetic valveless micropump." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/31637095204795676279.
Повний текст джерелаJhou, Pei-jia, and 周培家. "Thermal stress analysis of low temperature co-fired ceramics manufacturing processes." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/83089970971939912537.
Повний текст джерела國立中山大學
機械與機電工程學系研究所
94
In this study, stress problems occurring in low tempera -ture cofired ceramic processes are analyzed by finite element package ANSYS. Sintering stresses of sintering processes and residue stresses in cooling processes are investigated. The thermal shrinkage coefficient are used to deal with the density variation due to the shrinkage mismatch between the green tape and silver paste in the sintering processes. Deleting the elements is used to treat the situation when the element stress exceeds its fracture stress. The residue stresses due to the mismatch of the thermal expansion coefficients in cooling processes are also discussed.
Che-ChuanKuo and 郭銓哲. "Fabrication of micro-droplet generators in low temperature co-fired ceramics." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/53700669731075282020.
Повний текст джерела國立成功大學
機械工程學系
103
When a liquid jet experiences axisymmetric disturbance, the disturbance grows in space, moves downstream, and eventually breaks up the jet into droplets. The phenomenon is called capillary instability, also known as Rayleigh breakup. Based on this instability, the present study develops droplet generators made of low temperature co-fired ceramics (LTCC). Both the monodisperse and multi-size droplet generators are successfully fabricated. The LTCC generator is driven by a piezoelectric disc attached directly on a LTCC diaphragm to provide the necessary disturbance. A backpressure is provided to the chamber of the generator such that a liquid jet can be formed steadily through a nozzle. Nozzles with different diameters are manufactured successfully by CO2 laser drilling. It is shown that the proportion of glass in the LTCC green tape and the parameters of laser drilling are key factors in fabricating the nozzle. Results show that the droplet sizes depend on excitation frequency, nozzle diameter and jet velocity. In the range of working frequency, the sizes of the droplets agree well with theoretical predictions.
陳幼欣. "Study on Non-shrinkage Low Temperature Co-fired Al2O3 Microwave Dielectric Ceramics." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/47456433617626658863.
Повний текст джерелаChen, Hua Pin, and 陳華娉. "Study of Thick-Film Resistors Embedded in Low Temperature Co-fired Ceramics." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/60014911576357783040.
Повний текст джерела義守大學
材料科學與工程學系
91
This study investigated the electrical properties of buried resistor in the borosilicate glass-ceramics LTCC substrates. The relationships between the electrical properties and microstructures of the resistors were discussed. Homemade resistors were printed on the Al2O3 substrates and buried in the LTCC substrates. Conductive particles of the resistors agglomerated during heat-treatment. When the conductor-agglomeration of the resistor film reached 52vol%, the agglomerated conductive particles formed a continuous linkage structure, and the resistance of the resistors showed a consistent value. When the volume frictions of the RuO2 conductive agglomeration were at values between 42 to 52vol%, the resistance of the films decreased with increasing the RuO2 agglomeration volume fractions. The RuO2 agglomerate dispersed in the glass matrix of the resistor conductor and the network of the conductive particles disappeared when the volume friction of the RuO2 agglomeration was lower than 42vol%. The results of RuO2 agglomeration volume friction vs. resistivity of the embedded resistor films matched the conduction model developed by Vest. Migration of the glass compositions between the resistor film and LTCC substrates determined the phase separation during sintering. Compositions of B2O3、SiO2 and CaO diffused from substrate to the resistor film, and the Pb2+ ion migrated from the resistor film to substrate layer. In order to made lead(Pb) free resistor paste, a glass without Pb was prepared. A lead borosilicate glass was also prepared in order to compared with lead free paste. For the resistor with leaded glass had higher resistance than that with lead-free glass. Adding TiO2 and Fe2O3 to the lead-free resistor paste, the TCR value of the resistor decreased.
Wang, Xiaozhou. "Development of dielectric materials for low temperature co-fired ceramics (LTCC) application." Phd thesis, 2020. http://hdl.handle.net/1885/217352.
Повний текст джерелаLiu, Bang-kai, and 柳邦凱. "Improvement of microwave dielectric properties of diopside-based glass-ceramics using low temperature co-fired ceramic process." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/62909385079846193909.
Повний текст джерела國立臺灣科技大學
機械工程系
101
In this study, diopside glass-ceramics (CaMgSi2O6) materials sintered in reduced atmosphere, which required a low dielectric constant (k), high quality factor (Q×f) and a near zero temperature coefficient of the resonance frequency (τf) as a microwave dielectric ceramic materials, were studied. Experimental results reveal that different size of zirconia nucleating agents added into MgO-CaO-2SiO2 system show not only increase of nucleating agents but also enhancement of crystallization in diopside glass-ceramics. Microstructural features demonstrated that large of ZrO2 nucleating agents precipitate in the matrix due to addition of nano particle size in the diopside system. Moreover, Rietveld refinement results show that specimens with nanometer ZrO2 addition reveal low amorphous content (29.33 wt%) than specimens added with micrometer ZrO2 (33.01 wt%), and activation energy of crystallization also decrease from 548 kJ/mol to 497 kJ/mol, indicating that nano nucleating agents added into diopside glass-ceramic could increase the crystallization. Therefore, quality factors increase from 9,391 GHz to 11,127 GHz due to high crystallization. Furthermore, diopside glass-ceramics added with appropriate ceramics and sintered in reduced atmosphere were also investigated. The appropriate ceramics reveal high Qxf and high positive τf, respectively. Experimental results reveal that diopside glass-ceramics added with appropriate ceramics show that appropriate ceramics addition would induce the high reactive crystallization in CaMgSi2O6 glass-ceramics. Therefore, diopside glass-ceramics added with appropriate ceramics sintered at 960oC in reduced atmosphere reveal k=9.3,Qxf=7,709 GHz and ?輎=-0.05 ppm/oC application in LTCC process.
Huang, De-Long, and 黃得隆. "Development of Low Temperature Piezoelectric Materials and Application of Multi-layer Co-fired Ceramics." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/32123552952496543844.
Повний текст джерела國立臺灣科技大學
機械工程系
105
This paper mainly discusses the piezoelectric properties of lead-zinc-zirconium titanate titanate lead-based ceramic system through low-temperature sintering, the use of low-temperature material system to complete multi-layer piezoelectric ceramic components, and maintain a certain piezoelectric properties, and then used in the life of more Aspects of the components. Low temperature sintering to make use of materials and energy costs significantly reduced, add the appropriate amount of Li2CO3 when the use of combustion agent, and explore the different components of the ferroelectric, piezoelectric and other characteristics, the design of excellent actuating material system. 0.3Pb(Zn1 / 3Nb2 / 3) O3 - 0.7 Pb (Zr0.52Ti0.48) O3 is added as 0.3% to 0.9wt% of Li2CO3 as the sintering agent. It can be seen from the sintering temperature and density measurement. The best content of 0.6wt% and the sintering temperature at 900 ° C for 6 hours, can get the best properties and temperature sintering, etc., will promote the sintering rate and densification, piezoelectricity test in the zinc lead niobate content (72.6%) with the largest grain size (1.82 μm), the color of which was yellowish, and the color was yellowish, And high densification can even light transmission, the relative density of up to 95% or more, of which Li + ion replacement PZNZT system of Zn2 + formed by hardening modified to form the oxygen vacancy and improve the coercive field, in the modified system (14 kV / cm), the average residual value is maintained at (40 μC / cm2) while the strain rate of the material system in the block is also quite excellent Strain (0.35%), the other advantage is high Ritual temperature (average 280 ℃) is 0.3PZNZT + (0.3 ~ 0.9) wt% Li2CO3 advantage, can overcome the yuan The work of the heat generated by the heat or high temperature of the working environment, is expected to use the components on the demand for more consistent. Multi-layer components using modified ceramic powder with the industry common slurry configuration required strip, and screen printing, stacking, cutting, sintering and other processes, the completion of the final multi-layer components, while TGA detection by the relevant sintering parameters and complete multi-layer Ceramic strip and silver electrode at 900 ℃ sintering, EDS analysis can be learned, multi-layer ceramic components in the traditional sintering found that there will be partial silver problems and leakage current situation, the use of laboratory microwave sintering furnace at the same temperature Sintering effective control of silver electrode diffusion, whether microscopic or the performance of the performance, the piezoelectric constant d33 is 440pC / N, compared with the block material decreased, in the application of 45kV / cm (270V) voltage can reach 0.2% Adaptable and successfully overcome the above problems. 0.3Pb(Zn1/ 3Nb2 / 3) O3 - 0.7 Pb (Zr0.52Ti0.48) O3 + 0.6wt% Li2CO3 After the modification, it is found that the Qm quality factor is low (about 60), and the energy and mechanical energy , Resulting in high temperature within the material, or even more than the temperature above the house, the material into a cis phase, so that the characteristics of the material decreased, so the quality factor is also a component of the importance of one of the characteristics, so hardened by Mn added to the raw material system , The material system Qm is effectively raised (to 175).
Kang, Chun-yueh, and 康鈞岳. "Study of Lead-Free Thick-Film Resistors Embedded in Low Temperature Co-fired Ceramics." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/08124812799120515757.
Повний текст джерела義守大學
材料科學與工程學系碩士班
93
In this study, lead-free thick film resistors (TFRs) were prepared by mixing of ruthenium oxide (RuO2) and K2O-CaO-B2O3-SiO2 glass. The resistors were post-fired on alumina and co-fired in LTCC substrates. Five different metal oxides were added into the glass phase, such as Nb2O5, MnO2, MoO3, Fe2O3, TiO2, they were used as temperature coefficient of resistor (TCR) adjustment agents of the resistors. The influences of the microstructures changed and of the interactions at the interface between resistors and substrates were investigated. The volume fractions of conductor-agglomeration (RuO2) in resistor layers were influenced the electrical properties of thick-film resistors. When the volume fraction of conductor-agglomeration increased, the conductive particles became continuity, and the conductivity of TFRs increased. Glass content in the conductor-agglomeration influenced the electrical properties of the resistors after sintering. The content of glass phase in conductor-agglomeration increased with increasing dwelling time, the distances between RuO2 particles increased, and the conductivity of TFRs decreased. Five different metal oxides were added into the glass phase, such as Nb2O5, MnO2, MoO3, Fe2O3, TiO2, were used as temperature coefficient of resistor (TCR) adjustment agents. The additive made glass structure loose and conductivity of resistor decreased, the TCR values of the resistors moved toward negative direction. When adding 4wt% MnO2 into the glass phase, the thick-film resistors embedded in LTCC can get better electrical properties, the conductivity of resistor is 2.46 (Ω-cm)-1, the temperature coefficient of resistor decreased to 12 ppm/℃. During sintering, the interactions between resistors and substrates were more violent in co-fired process than in post-fired. The thick-film resistors embedded in the sintered LTCC substrates, large amount of CaO in the substrate layers diffused to the resistor layers. The diffusion behaviors of SiO2, Al2O3, MgO...etc. were not obvious.
Yang, Ya-Chun, and 楊雅鈞. "Design and Study of Low Temperature Co-Fired Ceramics High Frequency Multilayer Chip Inductors." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/38159798942537462475.
Повний текст джерела義守大學
電機工程學系
91
This thesis studies the design and characteristics analysis of Low Temperature Co-Fired Ceramics (LTCC) high frequency multilayer chip inductors, and establishes the equivalent circuit mode of device itself. The LTCC high frequency multilayer chip inductors consist of dielectric material and coil structure, which are widely applied to mobile communication and wireless transmission application. The parameters such as the number of coil, the thickness of dielectric layer…, etc. which concerned with the electrical characteristics and the application request of electrical characteristics are further analyzed in the study. The optimum design of electrical structure is found out by the analysis of frequency response and parasitic effect between simulation and measurement that the measurement system consists of network analyzer and impedance analyzer. The studies cover present situation and development trend of LTCC material system, design roadmap and process technology. Results obtained in the thesis could be employed to integration device design, manufacturing and measurement of LTCC technology.
Chen, Yan-ming, and 陳彥明. "Improvement of microwave dielectric properties at diopside-based glass-ceramics doped with ceramics by low temperature co-fired copper electrode process." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/83860300609882908450.
Повний текст джерела國立臺灣科技大學
機械工程系
102
In this study, diopside glass-ceramics (CaMgSi2O6) materials sintered at temperature below 1000 oC and co-fired with copper electrodes in a reducing atmosphere, which required a low dielectric constant (k), high quality factor (Q×f) and a near zero temperature coefficient of the resonance frequency (τf) as a microwave dielectric ceramic materials, were studied. First, in order to improve the quality factor of CaMgSi2O6 glass ceramics, configured with different molar proportions of (ZnxMg1-x)2SiO4 (x=0~1) ceramic powders, and explore its basic characteristics. According to the Mg2SiO4-Zn2SiO4 binary phase diagram the eutectic point about near x = 0.7, therefore the experimental results revealed that the densification temperature of (ZnxMg1-x)2SiO4 (x=0.6、0.7、0.8) ceramics can decrease to 1250oC. The quality factor values of (Zn0.6Mg0.4)2SiO4 can achieve nearly 45,000 GHz by sintering in air at temperature 1250 oC and 1300 oC for 2hr. Furthermore, adding different molar ratio of 10 wt% (ZnxMg1-x)2SiO4 (x=0~1) ceramic powders into CaMgSi2O6 glass ceramics to enhance the quality factor. From the experiment results, the quality factor values increased from 11,233 GHz to 13,845 GHz due to the addition of (Zn0.6Mg0.4)2SiO4 ceramics powders sintered in air at temperature 960 oC for 2hr. In order to improve the τf values to near 0ppm/oC and enhance quality factor values , CaTiO3 and (ZnxMg1-x)2SiO4 (x=0、0.6、0.7、0.8) was added to CaMgSi2O6 glass ceramics. Based on the previous studies, CaTiO3 soluted into the CaMgSi2O6 glass ceramics, so can’t improve the τf values. Experimental results showed that doped (ZnxMg1-x)2SiO4 ceramics can induce the crystallization of diopside glass-ceramics and caused CaTiO3 stability in the material system. Therefore, CaMgSi2O6 glass-ceramics added with 8wt% (Zn0.6Mg0.4)2SiO4 and 8wt% CaTiO3 ceramics sintered in reducing atmosphere at 960oC for 2hr shows excellent microwave dielectric properties : k=8.62,Qxf=11,650 GHz and ?輎=-1.2 ppm/oC . At last , CaMgSi2O6 glass-ceramics with copper electrodes were co-fired in reducing atmosphere at 960oC for 2hr and analyzed to detect interactions between the glass-ceramics and electrodes. XRD analysis revealed Cu4MgO5, Ca2CuO3, Ca2MgSi2O7, Mg2SiO4 and SiO2 secondary phases, which appears in the interface after co-firing. Due to high quality factor of Ca2MgSi2O7 and Mg2SiO4 secondary phases, it does not induce degradation in quality factor values. CaMgSi2O6 glass-ceramics doped 10wt% (Zn0.6Mg0.4)2SiO4 and 8wt% CaTiO3 ceramics with copper electrodes were co-fired in reducing atmosphere at 960oC for 2hr shows microwave dielectric properties : k=8.36,Qxf=9,061 GHz.
Wu, Po-Hsien, and 吳柏賢. "Dielectric properties of diopside-based glass-ceramics and diffusion effect of the co-fired silver electrode." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/77168980067425345912.
Повний текст джерела國立臺灣科技大學
機械工程系
105
Microwave dielectric ceramic materials play an important role in the wireless communications and portable devices, such as global positioning systems (GPS) and mobile phones. This study focuses on a novel microwave dielectric material - diopside (CaMgSi2O6) glass-ceramic. Diopside material has a unique character of low dielectric constant (k), low cost, high quality factor (Q*f value) and lower than 900℃ sintering temperature. Therefore, diopside is a potential candidate material for LTCC (Low Temperature Co-fired Ceramic) process. However, the large temperature coefficient of resonance frequency (τf), -60ppm/℃, is unstable to be applied in microwave dielectric components. In this case, ZnTiO3 was chosen to compensate the large negative temperature coefficient of resonance frequency (τf) of diopside glass-ceramics. Followed by this result, the microstructure analysis and electrode inhibition after co-fired with silver electrode were carried out by SEM-EDS in this work. In the first part of this research, different ratio of ZnTiO3 powder were added into diopside glass-ceramic and the heat treatment were carried out at 825~900℃ for 2 hours. In the beginning, specimens were unable to be densified at 825℃. As increasing heat treatment temperature, the specimens can be densified, from 850℃~ 900℃. Simultaneously, some silicate and titanate secondary phases with excellent microwave dielectric properties were formed, such as (Zn(1-x)Mgx)SiO4 with low dielectric constant and (Zn(1-x)Mgx)TiO3 with positive τf.. Therefore, the microwave dielectric properties of diopside material can be improved by these secondary phases. Finally, the optimal ratio is diopside with 30wt% ZnTiO3 addition, which contains the following key characteristics: k=9.2, Q*f=8232GHz, τf = -17.7ppm/℃ Electrode diffusion usually makes serious damages for components in changing the frequency unexpectedly and overall efficiency of components. Generally, silver ions are oxidized easily then diffuse into diopside glass-ceramics substrate during sintering process. To avoid the phenomena of silver diffusion, a sintering mechanisms without atmosphere control was used. According to references, ceramic phases or amorphous silica are used as both ways can inhibit the electrode diffusion efficiently. As demonstrating in previous chapter, some ceramic phases, silicate or titanate secondary phases, have been formed after adding ZnTiO3 during sintering process, the amorphous silica was chosen to inhibit silver diffusion in this research. Nanoscale amorphous silica forms quartz phase in sintering process around 700℃, and the quartz will become a obstacle for silver diffusion. The efficiency of diffusion effect can be measured by using sem-eds linescan. In conclusion, the optimal solution is to add 4wt% amorphous silica, which diminishes the diffusion effect of silver ions significantly.
Wu, Syu-Sheng, and 吳旭昇. "Multi-Band Integrated Antennas and Diplexers on Printed Circuit Boards and Low Temperature Co-fired Ceramics (LTCC) Filter." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/38841288599840833854.
Повний текст джерела國立交通大學
電信工程系所
93
The integrated RF front-end module of communication systems usually only includes a diplexer and two different bandpass filters. As the RF front-end module becomes highly integrated, the integrated design of a dual-band antenna and a diplexer will be in great trends for research and commercial products in the future. In the paper, Ansoft HFSS full wave simulator is used to be the design tool. The purpose of this paper is to propose a new integration design of a dual-band antenna and a diplexer that can be applied to the Wireless Local Area Network (WLAN) system. The dual-band antenna structure proposed by this paper is constructed by the original quarter wavelength (��/4) monopole antenna plus a sleeve structure. This improvement is expected to help obtain the wide bandwidth and dual-band effect. The diplexer is composed of stepped impedance resonator bandpass filter and ��/4 parallel coupled microstrip line bandpass filter. The proposed dual-band antenna structure possesses 22.49% and 32.58% impedance bandwidth under the WLAN band of 2.4 GHz and 5 GHz. The proposed integrated structures of the dual-band antenna and the diplexer can meet the requirements of the 2.4 GHz and 5.2 GHz WLAN systems. Besides, in order to obtain a WLAN bandpass filter with the specific of 2.4GHz, we apply LTCC to effectively process the selected suitable lumped element circuit model of the bandpass filter. The newly designed WLAN bandpass filter will be of small size, of high selectivity and highly integrated.
Chou, Yien-Tien, and 周晏田. "Two kinds of innovative magnetic near-field probes fabricated in low temperature co-fired ceramics for electromagnetic interference detection." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/kt2c7s.
Повний текст джерела國立臺灣大學
電子工程學研究所
101
With increasing operation speed, ever-complicated circuit structure, and dense packaging, electromagnetic interference (EMI) problem of electronic products becomes more and more serious. In general, EMI generation can be viewed as three parts: interference source, interfering path, and radiation antenna. To effectively suppress EMI, finding out the interference sources and eliminating them are always the most efficient and low-cost solution. In modern electronic products, most interference sources are caused by the rapid switching current of the integrated circuits (ICs). International Electrotechnical Commission (IEC) defines the IEC 61967 standard series to rapidly and accurately detect this kind of emission sources. The third and sixth parts of this standard series introduce the electromagnetic near-field (NF) measurement method. The detailed electromagnetic field distribution related to the voltage and current flowing paths over the surface of the IC device under test (DUT) can be obtained using this NF scanning method. Electrical engineers can debug the EMI according to the information of the field distribution. NF probe is the key component of the surface field scan method. Therefore, we review the previous papers concerning the NF probes and discuss their characteristics. They are mainly typed as electrical and optical probes, and then we further propose two kinds of innovative electrical probe structures in this dissertation. Firstly, several new types of low-cost and robust single-ended magnetic NF probes fabricated in low temperature co-fired ceramics (LTCC) are presented. Parallel C-shaped strips and its variations are inserted into the loop area in the front end of probes to achieve common-mode high-pass and notch filters for electric-field noise suppression. These probes with this kind of filter have excellent wideband electric field suppression. They are named as high electric field suppression (HEFS) probes type A~D. The size of loop aperture in all probes is 100 μm long and 400 μm wide. The signal received from the loop is routed to a measurement apparatus through a semi-rigid coaxial cable with outer diameter of 0.047 in. The flip-chip junction with low loss and good shielding is used between the probe head in LTCC and the semi-rigid coaxial cable. We take the probes over a 2000-μm-wide microstrip line as DUT to measure the probe characteristics. The isolation between electric and magnetic fields for a reference probe based on an old design using the same LTCC process is better than 30 dB from 0.05 to 12.65 GHz. Proposed type A probe has two parallel C-shaped strips, and it has better isolation of 35 dB from 0.1 to 11.05 GHz. Type C has one end of its strip shorted to ground, its 30 dB isolation frequency range can be extended to 0.05~17.8 GHz. With additional layout variation in type D, isolation can be improved to 40 dB up to 10.9 GHz. The spatial resolution for these probes is 140 μm when the distance between the metal surface of the microstrip line and the nearest edge of the loop is held at 120 μm. The calibration factors (CFs) of the proposed probes are only slightly increased as compared with reference probe. Secondly, to achieve good spatial resolution, small loop size is required in the traditional loop probe. However, the smaller loop size will lead to the lower sensitivity for the probe. In addition, loop size is always limited by the minimum line spacing of the fabrication process. Another problem is that the asymmetric electric field coupling into a probe will not be canceled perfectly even if the structure of this probe is symmetric. To circumvent these problems, the space difference magnetic NF probe with three kinds of spatial resolutions is proposed in this dissertation. The probe head including a single-turn loop and a two-turn loop is also manufactured in LTCC. The single-turn loop is clamped with the two-turn loop. Two loops are covered with two shielding ground plates to form a tri-plate structure. The received signals from these two loops are outputted with two SMA connectors through two striplines. In the same way, the flip-chip junction is used between the probe head and the striplines for assembly. The probe characteristics are measured using a 436-μm-wide microstrip line with impedance of 50 Ω. Two output ports have different spatial resolutions because two different loops are located above the microstrip line at different heights. The space difference probe will have higher spatial resolution when the received signals are outputted in difference. In comparison with one smaller double-loaded probe whose resolution is comparable to that of this difference output of the proposed probe by EM simulation, the proposed spatce difference probe can suppress the side electric field coupling well by the difference operation because two loops receive approximate electric field simultaneously.
Chen, Tai-How, and 陳泰豪. "Low-Temperature co-fired dielectric-magnetic ceramic composite." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/73213732103183175512.
Повний текст джерела國立成功大學
資源工程學系碩博士班
95
Recently, composite materials with both superior dielectric and magnetic properties can be used to produce a low cost and high performance L/C EMI filter for high frequency application. Therefore this composite material had attracted much attention. A high dielectric constant material, Bi-added BaO-Nd2O3-4TiO2, was chosen as the raw material for the present work. Moreover, a glass system was selected to be added to Bi-added BaO-Nd2O3-4TiO2 system to decrease the sintering temperature. The effects of various glasses addition on both the sintering behavior and dielectric properties were investigated. The results revealed that BNBT (BaO.(Nd0.8Bi0.2)2O3.4TiO2) with 20wt% BB25SZ (B-Bi-Si-Zn glass) could be densified at 900oC for 2h, which possess excellent dielectric properties. Furthermore, the above dielectric was mixed with different amount of NiCuZn ferrites to form dielectric-magnetic composites. With appropriate glass addition, the composites sintered at 900oC for 2h exhibited both superior dielectric and magnetic properties.
Yu-YingHsiao and 蕭裕穎. "Low Temperature Co-Fired Ceramic Micropumps with Conical Diffuser Valves." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/39075429913898002421.
Повний текст джерела國立成功大學
機械工程學系碩博士班
98
In this study, the investigation of the low temperature co-fired ceramic micropumps with conical diffuser valves and with pockets conical diffuser valves were designed and manufactured. The diaphragms of micropumps also used low temperature co-fired ceramic, so that the micropumps could be combined with diaphragms. Therefore, the reliability of micorpumps will be enhanced. Also, by applying the Genetic Algorithms and Computational Fluid Dynamics program FluentTM, the design optimization of the conical diffuser valves with pockets is automated. The obtained results of optimization show that the rectification efficiency will increase when the positions of the pockets approach the throat and the suitable pockets radius. The best rectification efficiency of 26.78% is obtained from the conical diffuser valves with pockets, and 5.51% more than the conical diffuser valves without pockets . Moreover, we used the parameters to design the low temperature co-fired ceramic micropumps with pockets conical diffuser valves. According to the experiment results, low temperature co-fired ceramic micropumps with pockets conical diffuser valves exhibited a better net volumetric flow rate and higher optimal actuation frequency than the low temperature co-fired ceramic micropumps without pockets conical diffuser valves when the back pressure is zero. When the drive voltage is 150 Vpp, the actuation frequency is the optimal frequency of different types of valves. When working fluid is deionized water and alcohol, the maximum net flow rate of the low temperature co-fired ceramic micropumps with pockets conical diffuser valves increased 20.45 % and 12.89 %, respectively. Whether the working fluid is deionized water or alcohol is in a similar Roshko range, a better performance will be displayed.
Wang, Yu-Ting, and 王俞婷. "Effects of Mg4Nb2O9 Ceramic Dielectric Modify Agent in Low Temperature Co-fired Ceramic Tape." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/67260512866183725268.
Повний текст джерела國立交通大學
材料科學與工程系所
94
In this study, two commercial glass, ZnO–B2O3–SiO2 (NEG Ltd., GP5210) and B2O3–SiO2 (NEG Ltd., GA50), were used to improve the sintering and dielectric property of Mg4Nb2O9 ceramic. The interaction between GP5210 and Mg4Nb2O9 resulted in the crystallization phase and superlattice structure. Further investigations indicated that the superlattice structure had greatly contributed to the microwave dielectric property. The optimized microwave dielectric properties of Mg4Nb2O9 /80wt % GP5210 were εr = 6.63, Q = 2855.9(9 GHz), τf = -16.72 ppm/℃.Compared to GP5210 / Mg4Nb2O9, there was no interaction between GA50 and Mg4Nb2O9. The optimized microwave dielectric properties of Mg4Nb2O9 / 80wt%GA50 were εr = 4.45,Q = 1788.4(9 GHz) ,τf = -16.89 ppm/℃. The optimized microwave dielectric properties of the LTCC Tape for B2O3–SiO2 glass system were εr = 4.253,Q = 12388.3 (15 GHz), and for ZnO–B2O3–SiO2 glass system were εr = 6.627, Q=19531.5 at 15GHz by Open Reasonator. The low-temperature sintering tape had appreciate dielectric properties, therefore, were suitable for LTCC application.
AdbulGhaffar, Farhan. "Design of LTCC Based Fractal Antenna." Thesis, 2010. http://hdl.handle.net/10754/133211.
Повний текст джерелаHuang, Wei Te, and 黃威特. "Study on Low Temperature Co-fired Ceramic Ba2Ti9O20 Microwave Dielectric Materials." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/32368631757701562687.
Повний текст джерелаTu, Tui-ting, and 涂瑞庭. "Study on dielectric materials of the low temperature co-fired ceramic." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/35346761560732185889.
Повний текст джерела義守大學
材料科學與工程學系碩士班
93
In order to develop the thick film dielectric materials on the low temperature co-fired ceramic substrate, the effects of B2O3 - SiO2- CaO - Al2O3 (BSCA) glass and lithium fluoride (LiF) addition on the sintering behavior and the dielectric properties of BaTiO3 (BT) were investigated. And finding the best composition and sintering condition of the BaTiO3. In the present study, two liquid-phase sintering aids, BSCA glass and LiF were added into barium titanate to reduce its sintering temperature. The densification rate and dielectric properties of barium titanate was significantly enhanced as the sintering temperature was raised above 745℃, the melting point of BSCA glass. The relative density is reduced by the increasing addition of the BSCA glass, but the addition of 30 wt% BSCA glass in the BT ceramic obtained the worst relative density(<70%). The relative density is enhanced by the addition of the LiF in the BT ceramic. The addition of the BSCA glass could lower the sintering temperature of BaTiO3. However, the BSCA glass reacted with BaTiO3 to form BaTiSiO5, Ba2TiSi2O8, and Ba2Al2B8O17. The dielectric constant of the reaction phases was low so that dielectric property of sintered BaTiO3 was thus degraded. The addition of 10 wt% BSCA glass in the BT ceramic obtained the best dielectric constant is about 401 when sintered at 1000℃. Because of the the addition of LiF can inhibit lower dielectric constant reaction phases and reduse the Curie temperature, the dielectric constant is enhanced by the increasing addition of the LiF. The Q value is enhanced by the increasing addition of the BSCA glass at the temperature below 900℃, the addition of 30 wt% BSCA glass in the BT ceramic obtained the best Q value is about 527. The Q value is enhanced by the addition of the LiF when sintered at 850℃, the addition of 30 wt% BSCA glass and 1 wt% LiF in the BT ceramic obtained the best Q value is about 690.But the Q value is reduced by the increasing addition of the LiF as the sintering temperature was raised above 900℃. The relative density, dielectric constant and Q value is reduced by the increasing addition of the B2O3 , because there was too many voids in the sample so that dielectric properties of sintered BaTiO3 was thus degraded.
Hung, Jian Luen, and 洪健倫. "Compact Stub-type Bandpass Filters with Low-Temperature Co-Fired Ceramic Process." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/05941539976858205345.
Повний текст джерела長庚大學
電子工程學系
98
The purpose of this thesis is to design miniaturized stub-type microstrip bandpass filters. A novel vertical inter connection in multi-layer structure is proposed that will allow us to fold the filter in half. The fabrication process of Low-Temperature Co-fired Ceramic (LTCC) is exploited for filter realization. The research results can be used in modern communication system applications for size reduction. Stub-type microstrip bandpass filters can provide wide bandwidth, controllable transmission zeros, raised attenuation rate, and good frequency selectivity. Thus, this thesis adopts stub-type microstrips as the basic structures for bandpass filter design. Circuits with light, thin, short, and small features are highly required in modern communication system. In recent years, various approaches in the stub-type microstrip bandpass filters based on the LTCC process are proposed and are highly noticed in international literatures. The LTCC process can have advantages of three-dimensional scheme, high integrity, and a small size. According to the aforementioned, this thesis is divided into three stub-type bandpass filter designs: (1)The development of vertical inter connection structure with good performance, which can be used in folded filter design to reduce its size. A LTCC vertically folded bandpass filter is designed to reduce filter size by 50%. (2)Moreover, the capacitively loaded structure is adopted to further reduce stub length of filters. An experimental bandpass filter is fabricated and operated at 5.8 GHz, which can have a length reduction of 30%. (3)This thesis proposes stepped-impedance-stub structures to synthesize a dual-band filter operated at 2.4/5.8 GHz. The good dual-band performance and compact size are achieved simultaneously. Several experimental bandpass filters are fabricated and measured, which show good performance as expected, and can be used for modern communication system applications.
Chi-MoHuang and 黃繼模. "Fabrication of Microfluidic Devices using Low Temperature Co-Fired Ceramic Tape Technology." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/74583452961183284311.
Повний текст джерела國立成功大學
機械工程學系
102
Applying low temperature co-fired ceramic (LTCC) tape technology on constructing 3-D microfluidic devices has drawn increasing attention in recent years. In the current research, a valveless micropump and a fully integrated micro-scale fuel reformer over Pt catalyst were fabricated and developed using LTCC tape technology. In addition to the detailed fabrication process, the performance of these two microfluidic devices was simulated in multiple programs and then carefully examined in experiments. These microfluidic devices were further optimized and the improved performance was demonstrated in experiments. In the valveless micropump, individual components of micropump including fluidic channels, diaphragm, chamber and planar diffuser valves were integrated in one LTCC module. Geometries of these components were designed based on numerical analysis that finite element analysis was used to characterize the displacement of a piezoelectric actuator whereas computational fluid dynamics was applied to design the planar diffuser. Performance of the designed micropump was carefully examined in experiments and the experimental data echoed the numerical analysis and revealed that the performance of a micropump was significantly improved by adding a pair of pockets near the neck of diffuser. In the micro-reformer, the microfluidic channels and Pt catalyst was integrated with a LTCC reformer by direct co-firing with no additional process. Current study compared the effect of different thicknesses of Pt catalyst (10 and 40 nm) in LTCC reformers. As a source of hydrocarbon, methanol was used and the production of hydrocarbon fuels including hydrogen, carbon monoxide and methane was measured by gas chromatography. Among different parameters tested, our results revealed that LTCC reformer coated with 10-nm Pt catalyst generated most hydrocarbon fuels at a flow rate of 1 ml/h and at temperature of 300 °C. Overall, the simulated results by finite element analysis and computational fluid dynamics, used in the current study showed good predictability as demonstrated in experimental results, which suggest that these simulations are feasible in designing and characterizing microfluidic devices prior to manufacturing processes. Moreover, LTCC tape technology is a simple and reliable method to fabricate microfluidic devices with heat-resistance, corrosion-resistance, air-tightness, full integration and high reliability.