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Return loss is lower than 10 dB over the whole frequency range. 5 mm have also been fabricated on the BST based films, as shown in Figure 27. Each resonator consists of a ring separated by a thin gap, Cgap, from a stub protruding from a microstrip. The resonant frequency of each ring is tuned by the BST capacitors between the rings and ground. Radial stubs are used to realize electrical short to the RF ground, simplifying the fabrication process by eliminating via drilling through sapphire. Figure 28 shows the tuning of the fabricated filter.
Moreover, the surface observation shows a rather good density of grains without cracks. Fig. 2. SEM photographies of BTS thin films annealed at 750 °C during 1 h (a) and at 950 °C during 15 min (b). 3. Dielectric characterizations The dielectric characterizations consist in determining the complex permittivity * as a function of frequency and temperature : * (F,T) = ’(F,T) - i”(F,T) (1) where ’ is the dielectric permittivity, ” is the dielectric losses and the ratio ”/’ = tgδ is the loss tangent.
Liu, G. & Meng, J. (2006). Facile Preparation of ZnTiO3 Ceramic Powders in Sodium/Potassium Chloride Melts. 3, (July 2005), pp. ; Sun, H. & Li, Y. (2006). 08TiO3 powders by a citrate method. 41, (December 2003), pp. S. H. (1998). Review Molten salt synthesis of lead-based relaxors. 33, (October 1997), pp. 2977-2984, ISSN 0022-2461 Zaremba, T. (2008). 5TiO3 ferroelectric. 2, (June 2007), pp. W. W. (2007). KxNa1-xNbO3 Powder Synthesized by Molten-Salt Process. 61, (Febuary 2006), pp. G. V. (2008).