Abstract
By the method of low-temperature co-fired ceramics (LTCC), with the addition of a small amount of reaction glasses with the composition Bi 2 O 3 –B 2 O 3 –SiO 2 –ZnO (BBSZ), we obtained the samples of isotropic and anisotropic polycrystalline hexaferrites BaFe 12 O 19 and SrFe 12 O 19 for the base layers of the subminiature microstrip ferrite untying instruments of the short–wave part of the millimeter wavelength ranges. The LTCC-technology makes it possible to simultaneously achieve compaction of the samples below 900 °C using the process of sintering of hexaferrites with the addition of a small amount of reaction glasses, which are based on Bi–B–Zn–Si–О (BBSZ). It was established that the use in the LTCC-technology of operation of pressing the samples (tablets) in the magnetic field makes it possible to obtain anisotropic hexaferrites, pressing without magnetic field – isotropic hexaferrites. The application in the LTCC-technology of the method of casting a tape allows obtaining entirely isotropic samples. Development of the technology of low-temperature co-fired ceramics, which consists of alternating ferrites and internal metal electrodes, is relevant in the production of miniature SHF-devices.
Highlights
The promising low temperature co-fired ceramics (LTCC) – hexaferrites – is of much interest for high-frequency applications such as phase switches, circulators, antenna and wireless technologies for miniature electronic modules of the generation
To decrease the dimensions of SHFdevices, it is necessary to examine multilayer devices based on the low-temperature co-fired ceramics (LTCC), which consist of alternating ferrites and internal metal electrodes
Hexaferrites are usually obtained by the classic ceramic technology [3, 4] at high temperatures of sintering to 1350 °C, which are not suitable for the LTCC technology
Summary
The promising low temperature co-fired ceramics (LTCC) – hexaferrites – is of much interest for high-frequency applications such as phase switches, circulators, antenna and wireless technologies for miniature electronic modules of the generation. To decrease the dimensions of SHFdevices, it is necessary to examine multilayer devices based on the low-temperature co-fired ceramics (LTCC), which consist of alternating ferrites and internal metal electrodes. Silver (Ag) is used as the internal metal electrode in multilayer devices because of its low losses and low electrical resistance at high frequencies [1, 2]. Since the melting point of Ag is 961 °С, it is necessary to design the LTCC materials that have sintering temperature about 900 °С, in order to avoid diffusion of Ag in ferrites. Hexaferrites are usually obtained by the classic ceramic technology [3, 4] at high temperatures of sintering to 1350 °C, which are not suitable for the LTCC technology
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