Development of Complex-Substrate-Type Circulator with Ferrite Column Embedded in Glass-Ceramic.

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  • フェライト埋め込みガラスセラミック複合基板型サーキュレータの開発
  • フェライト ウメ コミ ガラスセラミック フクゴウ キバンガタ サーキュレータ ノ カイハツ

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Reported here is the development of a complex-substrate-type circulator (CIR) with a ferrite column embedded in glass-ceramic (GC) . The CIR, designed to operate at about 30 GHz, is 3 mm square. We started with a GC substrate embedded with a Ni-Zn ferrite column (1.7 mm diameter), and on this we tested 3 possible conductive materials (Au, Ag, Ag-Pd) and 5 different diameter, ranging from 1.26 mm to 1.54 mm, for the circular center conductor area. The lowest insertion loss (0.5 dB) was achieved with Ag at a diameter of 1.33 mm. TemperatureCycle-Test (-55°C to 125°C) over more than 1000 cycles, this combination also suffered neither breaks in circulator circuits nor any cracking in any of the component materials. According to Coffin-Manson's Law, this would correspond to an estimated life span of 58 years.

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