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The l-D eigenfilter approach is extended for designing 2-D FIR filters. By minimizing a quadratic measure of the error in the 2-D frequency band, an eigenvector of an appropriate matrix is computed to get the filter coefficients. This method is not only simple but is also optimal in the least-squares sense. Several numerical design examples of 2-D arbitrary shape filters are used to illustrate the effectiveness of this approach.

The crystallization and dielectric properties of SrO-BaO-Nb 2 O 5 -SiO 2 glass-ceramics have been investigated. Glassceramics that contain strontium barium niobate (SBN) as a primary crystalline phase, which has a tungsten bronze structure, are produced. The formation of crystalline secondary phases also has been studied. The SBN phase shows evidence of both surface nucleation and bulk nucleation, and the crystals have an average composition of Sr 0.47 Ba 0.53 Nb 2 O 6 . The dendritic morphology of the SBN crystals has been examined. The SBN content and composite dielectric constant each has been studied as a function of heating temperature/time. The highest SBN content and dielectric constant obtained in the present study are 42 vol% and 180, respectively. The dielectric constant of the glass-ceramics is determined primarily by the SBN content and the residual glass phase. The dielectric constant of the randomly oriented SBN crystal in the glass-ceramics is calculated, using dielectric mixture rules, to be ϳ400.

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