LC-Notch-Filters Less Sensitive to LTCC Process Tolerances

Matters-Kammerer, Marion K.; Reimann, K.

doi:10.1109/lmwc.2006.879485

Cited by 1 publication

(1 citation statement)

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“…In order to cater to the unrelenting miniaturization, the next-generation microwave ferrite devices will have to be integrated into the host packaging material. Such examples are found in inductors, filters, etc., for LTCC in the radio frequency regime [1]- [3]. The purview of magnetic devices can be expanded to include applications, such as radar absorbents, transformers, and various nonreciprocal devices through the use of ferrite materials [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Ultra-High-Frequency Behavior of BaFe$_{12}$O$_{19}$ Hexaferrite for LTCC Substrates

2013

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M-type barium hexaferrite (BaFe O ) is investigated with an aim of using with low temperature co-fired ceramic (LTCC) substrate material. The as-calcined powders from combustion synthesis at neutral and acidic precursor solutions are used, which exhibit excellent properties of low coercive field values (up to 1350 Oe) and high magnetization (up to 60 emu/g). With an appropriate amount of Bi O as sintering aid, high density ferrites have been realized at LTCC processing temperatures. The sintered ferrites possess bulk resistivity in excess of cm, indicating their suitability for high-frequency applications. Complex magnetic permeability and magnetic loss factors are studied up to 1 GHz frequency. Complex permeability between 1.2 to 2.2 and magnetic loss tangent between 0.05-0.5 have been realized for the sintered ferrites. The influence of Bi O content on resistivity and high-frequency magnetic properties is discussed. It is observed that the sample prepared by employing neutral pH during combustion preparation and calcined at 1200 C for 12 h shows low coercivity of 1350 Oe. After sintering at 900 C with 2 wt% Bi O , the sample shows better results with permeability of 1.5-1.7, magnetic loss tangent below 0.3 up to 700 MHz frequency and a high resonance frequency of 140 and 715 MHz in VHF and UHF band, respectively. Since the synthesis conditions provide better control over basic magnetic properties, the use of combustion synthesized BaFe O material augers well for magnetic materials applications in LTCC technology.Index Terms-Barium hexaferrite, LTCC, non-reciprocal devices, permeability, VSM.

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