A Strip Line Broadside Hybrid Coupler Tolerant to Displacement Error and Thickness Variation in Multi-Layered LTCC Substrate

Takeshi YUASA  Yukihiro TAHARA  Hideyuki OH-HASHI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E91-C   No.10   pp.1684-1689
Publication Date: 2008/10/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.10.1684
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
multi-layered substrate,  LTCC,  stripline,  broadside coupler,  hybrid coupler,  manufacturing error,  

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Summary: 
A strip line broadside hybrid coupler which is tolerant to manufacturing errors in a multi-layered LTCC substrate has been developed. The tolerance to a displacement error and a thickness variation in the multi-layered LTCC substrate can be achieved by using the tandem arrangement of diagonally shifted coupled lines with adjacent ground walls. It has been demonstrated that the coupling deviation from designed characteristics in our proposed hybrid coupler is very small.