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Magnetically Aligned Anisotropic Conductive Adhesive for Microwave Applications

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6 Author(s)
Sungwook Moon ; Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN ; Sigmarsson, Hjalti H. ; Yilei Huang ; Bruemmer, T.
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Randomly dispersed particles in a material can be forced to align due to the presence of an externally applied field. These self-aligning materials are examples through which order is obtained through structure created internally which alters the bulk properties of the material. One such material is a magnetically aligned anisotropic conductive adhesive which uses the alignment of ferromagnetic particles in order to create current flow in only one direction. This paper discusses microwave application of such a material. We demonstrate that the magnetically aligned Z -axis anisotropic conductive adhesive works at microwave frequencies interconnecting silicon substrates through 90 GHz. The Z-axis material is found to be a suitable replacement for solder bumping even at high frequencies of operation. The effect of material composition and the radio frequency design is discussed in this paper. Finally, the Z -axis anisotropic conductive adhesive is found to be a suitable cost-effective replacement for solder bumps at high frequencies.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:56 ,  Issue: 12 )

Date of Publication:

Dec. 2008

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