Bibliografie tematiche / Ferrite and dielectric LTCC materials

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Letteratura scientifica selezionata sul tema "Ferrite and dielectric LTCC materials"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 3 febbraio 2022

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Articoli di riviste sul tema "Ferrite and dielectric LTCC materials"

Glitzky, Carsten, Torsten Rabe, Markus Eberstein, Wolfgang A. Schiller, Jörg Töpfer, Stefan Barth e Annette Kipka. "LTCC-Modules with Integrated Ferrite Layers—Strategies for Material Development and Co-Sintering". Journal of Microelectronics and Electronic Packaging 6, n. 1 (1 gennaio 2009): 49–53. http://dx.doi.org/10.4071/1551-4897-6.1.49.

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The integration of passive components (resistors, capacitors, inductors) into LTCC modules is a challenging task in multilayer ceramics technology. We report on multilayer assemblies consisting of combined layers of ferrite and dielectric LTCC tapes. Ni-Cu-Zn ferrites with maximum shrinkage at 900°C were processed to green tapes and laminated with dielectric LTCC tapes. Cosintering at 900°C led to multilayers with different defects such as incomplete densification of the ferrite layers, cracks, and warpage. Since ferrite tapes do not really allow compositional changes without deterioration of magnetic properties, the dielectric tape was modified with the following objectives: (i) matching of the shrinkage curves of dielectric and ferrite materials, (ii) adjusting the coefficients of thermal expansion to avoid cracking during cooling, and (iii) controlling of interface reactions. Using this concept we fabricated dense and defect-free multilayers consisting of dielectric and ferrite layers. However, compositional changes of the individual ferrite tapes require the development of a specific dielectric tape material with tailored properties.

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Rabe, Torsten, Hamid Naghib-zadeh, Carsten Glitzky e Jörg Töpfer. "Integration of Ni-Cu-Zn Ferrite in LTCC-Modules". Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2011, CICMT (1 settembre 2011): 000266–75. http://dx.doi.org/10.4071/cicmt-2011-tha14.

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Integration of magnetic functional components in LTCC circuit boards calls for co-firing of dielectric and ferrite tapes. Ni-Cu-Zn ferrites with permeability of μ =900 were developed which can be fully densified at the standard LTCC sintering temperature of 900 °C. Successful co-firing of this ferrite with dielectric tapes requires the adaptation of the shrinkage behavior of the materials as well as the thermal expansion during the cooling period - especially in the temperature range below the transformation point of the glassy phase of the dielectric tape. To match these preconditions, a new dielectric LTCC material with steep sintering curve and high thermal expansion coefficient was designed. Sintered multilayer composed of Ni-Cu-Zn ferrite and tailored dielectric tapes are free of cracks and possess no open porosity. No significant interdiffusion between the ferrite and dielectric tapes was found by EDX measurements. Compared to pure ferrite laminates the permeability of co-sintered Ni-Cu-Zn ferrite layers is drastically reduced to 400, i.e. a decrease of more than 50 %. To investigate the origin of this permeability reduction, Ni-Cu-Zn ferrite laminates were sintered separately, and in combination with alumina release tapes or dielectric tapes, respectively. SEM and EDX analysis of co-fired laminates reveal differences in the ferrite grain growth behavior. Ferrite laminates with homogeneous microstructure and grain size up to 50 μm exhibit large permeability. However, growth of ferrite grains does not take place near the interface between ferrite and release or dielectric tapes. There is a strong correlation between high permeability and volume fraction of large ferrite grains. Regions of fine and coarse grains inside the ferrite layers show different bismuth concentration; the Bi-content is larger in regions of fine ferrite grains.

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Qassym, Lilia, Gérard Cibien, Richard Lebourgeois, Gilles Martin e Dorothée Colson. "New Ferrimagnetic Garnets for LTCC-Technology Circulators". Journal of Microelectronics and Electronic Packaging 14, n. 2 (1 aprile 2017): 51–55. http://dx.doi.org/10.4071/imaps.358290.

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Abstract Yttrium iron garnet-based ferrites are used in nonreciprocal devices like microwave circulators and isolators. The low dielectric and magnetic losses of those materials provide the required properties. The main drawbacks of circulators are their size and cost, due to complex mechanical assembling of the different materials. To simplify the complex manufacturing process, a possible solution would be to adapt the different materials to a common low temperature cofired ceramic (LTCC) process: the circulators would be produced with an additive multilayer process. We showed that cationic substitutions (bismuth and copper) enable a considerable decrease of the sintering temperature of garnets, from ~1,450°C to down to ~950°C. Furthermore, due to bismuth cations, a high permittivity is achieved, allowing the reduction of the circulator core size. Our most recent results show that it is possible to decrease this temperature down to 880°C, thanks to vanadium substitutions. This significant decrease of the sintering temperature leads to a compatible material for cofiring with gold and particularly with silver (melting points 1,064°C and 962°C, respectively). Different assemblies of tapes were studied: ferrite with silver or gold, ferrite with dielectric and ferrite with dielectric and metallization. Physical analyses (dilatometry, coefficient of thermal expansion, etc.) are exposed and magnetic and dielectric properties (permittivity and saturation magnetization) are discussed. Moreover, the first results of circulators in LTCC technology with gold and silver screen printing are presented (transmission, isolation, and return loss) and the compatibility of the different elements is analyzed.

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Qassym, Lilia, Gérard Cibien, Richard Lebourgeois, Gilles Martin e Dorothée Colson. "New ferrimagnetic garnets for LTCC-technology circulators". International Symposium on Microelectronics 2016, n. 1 (1 ottobre 2016): 000586–90. http://dx.doi.org/10.4071/isom-2016-thp24.

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Abstract Yttrium Iron Garnet based ferrites are used in non-reciprocal devices like microwave circulators and isolators. The low dielectric and magnetic losses of those materials provide the required properties. The main drawbacks of circulators are their size and cost, due to complex mechanical assembling of the different materials. In order to simplify this complex manufacturing process, a possible solution would be to adapt the different materials to a common LTCC (Low Temperature Co-fired Ceramics) process: the circulators would be produced with an additive multilayer process. We showed that cationic substitutions (bismuth and copper) enable a considerable decrease of the sintering temperature of garnets, from about 1450°C to down to 950°C. Due to bismuth cations, a high permittivity is achieved allowing the reduction of the circulator size. Our most recent results show that it is possible to decrease this temperature down to 880°C, thanks to vanadium substitutions. This significant decrease of the sintering temperature leads to a compatible material for co-firing with gold and in particular with silver (melting point of 1064°C and 962°C respectively). Different assemblies of tapes were studied: ferrite with silver or gold, ferrite with dielectric and ferrite with dielectric and metallization. Physical analyses are exposed (dilatometry, coefficient of thermal expansion…) and magnetic and dielectric properties are discussed (permittivity and saturation magnetization). Moreover the first results of circulators in LTCC-technology with gold and silver screen printing are presented (transmission, isolation and return loss) and the compatibility of the different elements is analyzed.

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Matz, Richard, Dieter Götsch, Thomas Goßner, Roman Karmazin, Ruth Männer e Bernhard Siessegger. "Power Inductors in Ceramic Multilayer Circuit Boards". Journal of Microelectronics and Electronic Packaging 5, n. 4 (1 ottobre 2008): 161–68. http://dx.doi.org/10.4071/1551-4897-5.4.161.

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Power electronic inductors, with values of several μH, have been integrated into thermally stable ceramic multilayer circuit boards by the use of NiZnCu and MnZn ferrite tapes in low temperature cofired ceramic (LTCC) technology. These ferrites are particularly attractive for switched mode power supplies in automation, drives, and consumer applications, where the miniaturization of modules is triggered by advances in transistor technology and switching frequencies. The small signal analysis of embedded individual inductors and coupled transformer coils reveals the generic design rules for these components and additional materials properties beyond those accessible by ring core measurements. In the process of adapting the materials to LTCC, the distinct differences between the two materials become blurred, for example, they can be engineered to exhibit similar cutoff frequencies. NiZnCu ferrite, which is sinterable in air, may even achieve higher permeability than MnZn ferrite. The latter, however, shows higher saturation flux density and current capacity of buried inductors for power line filters. The coupled inductor design in a transformer is particularly ruled by the shunt capacitance inside the coils and by the fact that Maxwell equations preclude strong magnetic coupling between ferrite-embedded conductor lines. While parasitic capacitances remain tolerable for standard dielectric layer material up to several MHz, the need for magnetic coupling requires a fabrication process for magnetic vias.

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Hagymási, Marcel, Andreas Roosen, Roman Karmazin, Oliver Dernovsek e Werner Haas. "Constrained sintering of dielectric and ferrite LTCC tape composites". Journal of the European Ceramic Society 25, n. 12 (gennaio 2005): 2061–64. http://dx.doi.org/10.1016/j.jeurceramsoc.2005.03.011.

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Bartsch, Heike, Sebastian Thiele, Jens Mueller, Dirk Schabbel, Beate Capraro, Timmy Reimann, Steffen Grund e Jörg Töpfer. "Multilayer ferrite inductors for the use at high temperatures". Microelectronics International 37, n. 2 (9 maggio 2020): 73–78. http://dx.doi.org/10.1108/mi-11-2019-0072.

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Purpose This paper aims to investigate the usability of the nickel copper zinc ferrite with the composition Ni0.4Cu0.2Zn0.4Fe1.98O3.99 for the realization of high-temperature multilayer coils as discrete components and integrated, buried function units in low temperature cofired ceramics (LTCC). Design/methodology/approach LTCC tapes were cast and test components were produced as multilayer coils and as embedded coils in a dielectric tape. Different metallization pastes are compared. The properties of the components were measured at room temperature and higher temperature up to 250°C. The results are compared with simulation data. Findings The silver palladium paste revealed the highest inductance values within the study. The measured characteristics over a frequency range from 1 MHz to 100 MHz agree qualitatively with the measurements obtained from toroidal test samples. The inductance increases with increasing temperature and this influence is lower than 10%. The characteristic of embedded coils is comparable with this of multilayer components. The effective permeability of the ferrite material reaches values around 130. Research limitations/implications The research results based on a limited number of experiments; therefore, the results should be verified considering higher sample sizes. Practical implications The results encourage the further investigation of the material Ni0.4Cu0.2Zn0.4Fe1.98O3.99 for the use as high-temperature ferrite for the design of multilayer coils with an operation frequency in the range of 5-10 MHz and operation temperatures up to 250°C. Originality/value It is demonstrated for the first time, that the material Ni0.4Cu0.2Zn0.4Fe1.98O3.99 is suitable for the realization of high-temperature multilayer coils and embedded coils in LTCC circuit carriers with high performance.

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Yang, Yan, Huaiwu Zhang, Jie Li, Yiheng Rao, Gang Wang e Gongwen Gan. "Bi3+ doping-adjusted microstructure, magnetic, and dielectric properties of nickel zinc ferrite ceramics for high frequency LTCC antennas". Ceramics International 46, n. 16 (novembre 2020): 25697–704. http://dx.doi.org/10.1016/j.ceramint.2020.07.046.

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Marić, Andrea, Goran Radosavljević, Nelu Blaž, Walter Smetana e Ljiljana Živanov. "Embedded Ferrite LTCC Inductors". Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2012, CICMT (1 settembre 2012): 000388–93. http://dx.doi.org/10.4071/cicmt-2012-wa48.

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This paper presents for the first time one realization of simple planar inductor realized inside the stack of ferrite LTCC (Low Temperature Co-fired Ceramic) tapes. Presented inductor is one layer square spiral fabricated in the LTCC technology. In order to point out benefits of implementation of ferrite material on inductor inductance, the same inductor geometry was fabricated between two dielectric LTCC tapes. Commercially available LTCC material (both ferrite and dielectric) were implemented for the realization of proposed inductors. Designed structures were characterized and obtained experimental results show that even implementation of a very thin layer of ferrite material around inductor lines drastically increases its inductance. For the same inductor design that occupies the same chip area the inductance enhancement over 11 times is achieved. In addition this enhancement is followed with maintenance of good performance of the inductor.

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Naghib-zadeh, Hamid, e Torsten Rabe. "Pressure-Assisted Sintering of Multilayer Transformer Using LTCC-Compatible NiCuZn-Ferrite and Silver Conductor". Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2012, CICMT (1 settembre 2012): 000476–83. http://dx.doi.org/10.4071/cicmt-2012-wp15.

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A low-fired NiCuZn-ferrite and a new LTCC dielectric material with matched sintering shrinkages and coefficients of thermal expansion were used for integration of magnetic function into LTCC. Silver was used as inner conductor material. Silver diffusion during sintering into the surrounding glassy phase modifies the sintering behaviour of LTCC near the silver conductor and generates warping and delamination of the multilayer. Silver diffusion can be prevented by sintering in nitrogen atmosphere. However, sintering in nitrogen atmosphere causes partial decomposition of NiCuZn-ferrite by reduction of divalent copper oxide (CuO) to cuprite (Cu2O). It was found that diffusion of silver and associated deformation can be highly reduced if a higher heating rate during sintering in air is used. A Defect-free multilayer transformer with several silver conductive layers could be manufactured by pressure-assisted sintering only.

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Più fonti

Tesi sul tema "Ferrite and dielectric LTCC materials"

Andrea, Marić. "Metode za poboljšanje RF performansi mikro-induktorskih i transformatorskih struktura". Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2016. http://www.cris.uns.ac.rs/record.jsf?recordId=101196&source=NDLTD&language=en.

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Tematika disertacije obuhvata projektovanje, izradu i karakterizaciju pasivnih induktivnih RF komponenti u PCB i LTCC tehnologiji, kao i poboljšanje njihovih performansi. Izvršena je i karakterizacijarazličitih tipova dielektričnih i feritnih LTCC materijala koji su korišćeni za izradu komponenti. Ukupno je projektovano i izrađeno 37 struktura, 14 induktora i 23 transformatora. Na poboljšanje karakteristika projektovanih struktura, koje se ogleda prvenstveno u povećanju induktivnosti zavojaka, uticalo se izradom projektovanih struktura na supstratima izrađenih od različitih materijala, supstratima formiranih od kombinacije materijala različitih karakteristika, redizajnom osnovnih (polaznih) geometrija struktura i optimizcijom parametara LTCC postupka izrade.
Topic of this theases focuses on design, fabrication and characterization of industive passive RF components in PCB and LTCC technology, as well as on improvement of their performances. Characterization of different types ofdielectric and ferrite LTCC materials that were implemented for component fabrication was also performed. In total, 37 structures were designed and fabricated, of those 14 are inductor structures and 23 are transformers. Performance improvement of designed structures that is manifested through increase of inductance value of structures windings implied fabrication of designed components on substrates formed from different materials, or from combination of two or more materials with different properties, redesign of original design and optimization of LTCC fabrication process parameters.

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Hunter, Robert Iain. "Characterisation of ferrite and dielectric materials and their use in millimetre-wave quasi-optical devices". Thesis, University of St Andrews, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.586905.

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Crain, Bruce Richard. "Vector finite element methods for spurious-free solutions of unbounded dielectric and ferrite loaded waveguiding structures". Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/15501.

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Garreau, Jonathan. "Étude de filtres hyperfréquence SIW et hybride-planaire SIW en technologie LTCC". Phd thesis, Université de Bretagne occidentale - Brest, 2012. http://tel.archives-ouvertes.fr/tel-00858068.

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La maîtrise de la communication et de l'information est un atout primordial dans les stratégies de pouvoir, qu'elles soient militaires, politiques ou commerciales. Celui qui est capable de transmettre l'information plus vite prend l'avantage sur les autres. Tel est le moteur de la croissance et du progrès dans le domaine des télécommunications. L'omniprésence grandissante des dispositifs communicants témoigne de l'expansion exponentielle qu'a connu ce domaine depuis les premières communications sans fil. À l'époque du all-in-one, la multiplication des applications au sein d'un même appareil nécessite l'utilisation de composants toujours plus performants et petits . Au cœur de ces systèmes, les filtres ont une importance grandissante. Dans un environnement spatial, les contraintes de fiabilité et d'encombrement sont particulièrement drastiques. Le choix des matériaux est par ailleurs limité, ce qui réduit les possibilités d'innovation. Cependant, l'amélioration de la précision et de la fiabilité dans les technologies de fabrication ouvre de nouvelles perspectives d'innovation et d'amélioration des composants. Ces travaux ont ainsi été motivés par ce souci d'apporter toujours plus de performance et de fiabilité, pour un encombrement moindre en tirant profit du potentiel offert par l'association du concept SIW et de la technologie LTCC. Les résultats mettent à jour de sérieuses dispersions technologiques. Cependant, le potentiel de l'association SIW/LTCC est démontré, et les difficultés rencontrées sont surmontables. Les filtres SIW en technologie LTCC présentent donc des atouts pour s'imposer comme une alternative sérieuse aux solutions existantes.

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Akbari, Ashkan Naeini Ali [Verfasser]. "New dielectric tape materials for LTCC: characterisation and modelling of microwave properties / vorgelegt von Ashkan Naeini Ali Akbari". 2004. http://d-nb.info/972889701/34.

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Capitoli di libri sul tema "Ferrite and dielectric LTCC materials"

Ganne, Jean-Pierre, Michel Pate, Olivier Durand e Claude Grattepain. "Dielectric Properties of High-K LTCC Materials". In Ceramic Transactions Series, 207–14. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118407899.ch22.

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Liu, Yang, Yan Wang e Ju Sheng Ma. "Dielectric Properties of LTCC System of Al₂O₃ and Borosilicate Glass". In Key Engineering Materials, 783–85. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.783.

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Kagata, Hiroshi, e Hidenori Katsumura. "Microwave Dielectric Properties of Al2 O3 -MgO-ReOx (Re: Rare Earth) Systems and Their Application to New LTCC". In Recent Developments in Electronic Materials and Devices, 193–98. 735 Ceramic Place, Westerville, Ohio 43081: The American Ceramic Society, 2012. http://dx.doi.org/10.1002/9781118371107.ch20.

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Kim, Yu Jin, Seong Jin Hwang e Hyung Sun Kim. "Microwave Dielectric Properties of LTCC Materials Consisting of BaO-TiO₂-SiO₂-Al₂O₃ Glass - BaNd₂Ti₅O₁₄ Ceramic Composites". In Materials Science Forum, 506–9. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-966-0.506.

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Bhardwaj, S. "Multiferroicity in Aurivillius Based Bi4Ti3O12 Ceramics: An Overview, Future Prospective and Comparison with Ferrites". In Materials Research Foundations, 311–35. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901595-9.

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The growing modern society demands more new generation devices to fulfil their requirements. This has forced the scientific community to develop multifunctional smart devices. Aurivillius based Bi4Ti3O12 ceramics are one of the leading families of oxide materials, which attract immense attention due to their electrical, ferroelectric, optical, and dielectric properties. These materials have gained special attention due to their numerous device applications such as magnetic recording, sensors, read head technology, spintronic devices, switching devices, data storage devices and multiple state memory devices etc. Multiferroic are the materials in which two or more than two ferroic orders exist simultaneously. This chapter focuses on the possibility of existence of multiferroic behaviour in Aurivillius based compounds specially Bi4Ti3O12. Firstly, we have discussed the basics of multiferroics and their types and the magnetoelectric effect. The effect of different dopants in originating the multiferroism in Bi4Ti3O12 have been reviewed and discuss in detail. At the end comparison of multiferroic and ferrite materials and their future perspective have been discussed.

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Atti di convegni sul tema "Ferrite and dielectric LTCC materials"

Maric, Andrea, e Ljiljana Zivanov. "3D Micro-Transformers Fabricated Inside Ferrite-Dielectric LTCC Substrate". In 2019 42nd International Spring Seminar on Electronics Technology (ISSE). IEEE, 2019. http://dx.doi.org/10.1109/isse.2019.8810165.

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Jasinska, Laura, Jan Macioszczyk, Karol Malecha e Piotr Slobodzian. "Dielectric characterization of selected LTCC materials for microwave applications". In 2017 21st European Microelectronics and Packaging Conference (EMPC) & Exhibition. IEEE, 2017. http://dx.doi.org/10.23919/empc.2017.8346927.

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Zhang, H. W., H. Zhong, B. Y. Liu, Y. L. Jing e Y. Y. Liu. "Electro-magnetic properties of a new ferrite-ceramic low temperature Co-calcined (LTCC) composite materials". In INTERMAG Asia 2005: Digest of the IEEE International Magnetics Conference. IEEE, 2005. http://dx.doi.org/10.1109/intmag.2005.1463876.

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Bera, J., e P. K. Roy. "Preparation and Electromagnetic Properties of MgCuZn Ferrite-Z5U Dielectric Composites". In Proceedings of the International Conference on Materials for Advanced Technologies (Symposium P). WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812709547_0008.

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Nongjai, Razia, Khalid Mujasam Batoo, Shakeel Khan, Dinesh K. Aswal e Anil K. Debnath. "Study Of Structural And Dielectric Properties Of Ni-Mg Ferrite Nanoparticles". In INTERNATIONAL CONFERENCE ON PHYSICS OF EMERGING FUNCTIONAL MATERIALS (PEFM-2010). AIP, 2010. http://dx.doi.org/10.1063/1.3530540.

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Mu, Mingkai, Yipeng Su, Qiang Li e Fred C. Lee. "Magnetic characterization of low temperature co-fired ceramic (LTCC) ferrite materials for high frequency power converters". In 2011 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2011. http://dx.doi.org/10.1109/ecce.2011.6064050.

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"Study of ferrite by resonant nuclear scattering nickel-iron: the influence of directional order". In 1st International Symposium on Dielectric Materials and Applications. Materials Research Forum LLC, 2016. http://dx.doi.org/10.21741/9781945291197-65.

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Cochet, G., A. Vallecchi, A. G. Schuchinsky, P. Queffelec, V. Laur e R. Cahill. "Interwoven spiral arrays on ferrite-dielectric substrates for high-impedance metasurfaces". In 2014 8th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS). IEEE, 2014. http://dx.doi.org/10.1109/metamaterials.2014.6948606.

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Cochet, G., P. Queffelec, A. G. Schuchinsky, V. Laur e R. Cahill. "Non-reciprocity in doubly periodic strip arrays on ferrite-dielectric substrate". In 2013 7th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS 2013). IEEE, 2013. http://dx.doi.org/10.1109/metamaterials.2013.6808970.

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Zlebic, Cedo, Ljiljana Zivanov, Miodrag Milutinov, Nelu Blaz, Goran Radosavljevic, Andrea Maric e Mirjana Damnjanovic. "The Impact of the Sintering Temperature of Ferrite LTCC Materials on the Characteristics of dc Tunable Inductor". In 2018 41st International Spring Seminar on Electronics Technology (ISSE). IEEE, 2018. http://dx.doi.org/10.1109/isse.2018.8443649.

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