Authors: A F L Almeida P B A Fechine L C Kretly A S B Sombra
Publish Date: 2006/07/01
Volume: 41, Issue: 14, Pages: 4623-4631
Abstract
The solid state procedure was used to produce bulk ceramics of BTO BaTiO3 CCTO CaCu3Ti4O12 and BTO05–CCTO05 that were studied in the mediumfrequency MF range 100 Hz–1 MHz and in the microwave range of frequencies The presence of BTO is decreasing the dielectric constant εr of the BTO–CCTO composite The CCTO and BTO samples present a strong tendency to the increase of the loss with frequency The BTO substrates are presenting higher values of the εr in the range of 1–4 GHz around 140 For pure CCTO the dielectric constant is around 376 Similar behaviour observed at the MF range that the higher dielectric constant is also associated to the higher loss is also present in the microwave region The study of a planar microstrip antenna that uses the BTOX–CCTO1−X ceramic as a high εr substrate was done Therefore these measurements confirm the potential use of such materials for small high dielectric planar antennas HDA These materials are also very promising for capacitor applications and certainly for microelectronics microwave devices cell mobile phones for example where the miniaturization of the devices is crucial
Keywords: