volume | PIER Journals

2008-01-03

CPW-to-Stripline Vertical via Transitions for 60ghz LTCC Sop Applications

Young Chul Lee

Prof. Young Chul Lee

Div. of Marine Electronics and Communication Engineering

Mokpo National Maritime University (MMU)

Korea

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, Vol. 2, 37-44, 2008

doi:10.2528/PIERL07122805

Abstract

In this work, CPW-to-stripline (SL) vertical via transitions using gradually stepped vias and embedded air cavities are presented for V-band LTCC System-on-Package (SoP) applications. In order to reduce radiation loss due to abrupt via discontinuities, gradual via transitions are proposed and investigated. In addition, in order to reduce increased parasitic shunt capacitance due to stepped via structures, air cavities are embedded below the transition vias. Using a 3-D EM simulation tool, the proposed transitions are designed and analyzed, compared to the conventional transition. Three-segment transmission lines (CPW-SL-CPW) in 7-layer LTCC dielectrics were fabricated and measured. The two stepped via (STV2) transition embedding air cavities shows an insertion and return losses of 1.6 dB and below -10 dB, respectively, over 60 GHz. The transition loss per one STV2 transition is 0.7 dB at 60 GHz.

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Young Chul Lee, "CPW-to-Stripline Vertical via Transitions for 60ghz LTCC Sop Applications," , Vol. 2, 37-44, 2008.
doi:10.2528/PIERL07122805

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