Design of monoblock dielectric filter using (PbCa)(FeNbSn)O3 ceramics

Chong Yun Kang, J. I.Won Choi, Seok Jin Yoon, Hyun Jai Kim, Chang Yub Park

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The microwave dielectric properties of (Pb1-xCa){(Fe0.5Nb0.5)1-y Sny}O3 ceramics (0.4≤×≤0.6, y = 0.05, 0.1) and design of 900 MHz band 2-pole monoblock band pass filter (BPF) have been investigated to fabricate BPF. Single-phase specimens having orthorhombic perovskite structure similar to CaTiO3 could be obtained in the compositions of (Pb1-xCax){(Fe0.5Nb0.5)1-y Sny}O3(0.4≤×≤0.6, y = 0.05, 0.1). The substitution of Sn for (Fe0.5Nb0.5) significantly increased the quality factor Q and slightly decreased the dielectric constant (εr). The temperature coefficient of the resonant frequency of 0 ppm °C-1 was realized at x = 0.55 and y = 0.1. The Q·f0 value and εr for this composition were found to be 8600 GHz and 86, respectively. A monoblock λ/4 dielectric BPF for 900 MHz band portable telephone terminal is presented. This BPF is a kind of combline filter. Computer-aided design (CAD) was used in the modeling procedure. The equivalent circuit of the monoblock BPF is represented by transmission lines and lumped elements based on Zoe and Zoo. A BPF model was designed for surface mounted device (SMD) types. The simulations of the equivalent circuit and BPF structure have been performed to optimize the filter design. Newly developed (Pb0.45Ca0.55){(Fe0.5Nb0.5)0.9Sn0 .1}O3 dielectric materials were used for BPF fabrication. Experimental results of the fabricated device were in good agreement with the simulation.

Original languageEnglish
Pages (from-to)661-666
Number of pages6
JournalJournal of Materials Science: Materials in Electronics
Volume10
Issue number9
DOIs
Publication statusPublished - 1999
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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