Dielectric permittivity and loss of CaCu3Ti4O12 (CCTO) substrates for microwave devices and antennas

dc.creatorKretly, LC
dc.creatorAlmeida, AFL
dc.creatorFechine, PBA
dc.creatorde Oliveira, RS
dc.creatorSombra, ASB
dc.date2004
dc.dateOCT
dc.date2014-11-15T13:47:28Z
dc.date2015-11-26T17:20:17Z
dc.date2014-11-15T13:47:28Z
dc.date2015-11-26T17:20:17Z
dc.date.accessioned2018-03-29T00:07:54Z
dc.date.available2018-03-29T00:07:54Z
dc.identifierJournal Of Materials Science-materials In Electronics. Kluwer Academic Publ, v. 15, n. 10, n. 657, n. 663, 2004.
dc.identifier0957-4522
dc.identifierWOS:000223484400004
dc.identifier10.1023/B:JMSE.0000038920.30408.77
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/61719
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/61719
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/61719
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1283100
dc.descriptionThe solid state procedure was used to produce bulk ceramics of CCTO (CaCu3Ti4O12). The samples of the CCTO ceramic were studied by X-ray powder diffraction, infrared and Raman scattering spectroscopy. The infrared and Raman scattering spectroscopy confirm the formation of the CCTO phase as seen by X-ray diffraction analysis. For one experimental procedure one uses an organic binder in the process of shaping the samples. In the second procedure the samples were prepared without the presence of the organic phase. For the second situation, we had higher dielectric constant (epsilon(r) = 7370) with high loss (D = 0.2) at 1 KHz. For the first procedure one has the lower dielectric constant (epsilon(r) = 1530) and lower loss (D = 0.11) at 1 KHz. Simple rectangular antenna prototypes were also designed on substrate samples (C1, C2, P1 and P2). For the antennas (with P2, C1 and C2 as substrates), the bandwidth (BW) is 90 MHz (around 3%). The antenna with P1 substrate presented a surprisingly high BW of 270 MHz that corresponds to a 10% bandwidth. In the microwave range one observes that higher values of the Er in the range of 3 GHz antennas is also presented by the P1 sample (epsilon(r) = 41.6), and the lowest one was presented by P2 (epsilon(r) = 33.7). Sample P1 also presents the highest value for the loss (Q(-1)) which is around 0.1 compared to the other samples which is around 0.03. Therefore, these measurements confirm the potential use for small high dielectric planar antennas. These materials are also attractive for capacitor applications and certainly for microelectronics, and microwave devices (e.g., cell mobile phones), where the miniaturization of the devices is crucial. (C) 2004 Kluwer Academic Publishers.
dc.description15
dc.description10
dc.description657
dc.description663
dc.languageen
dc.publisherKluwer Academic Publ
dc.publisherDordrecht
dc.publisherHolanda
dc.relationJournal Of Materials Science-materials In Electronics
dc.relationJ. Mater. Sci.-Mater. Electron.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectConstant
dc.titleDielectric permittivity and loss of CaCu3Ti4O12 (CCTO) substrates for microwave devices and antennas
dc.typeArtículos de revistas


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