A New Low-Loss Microstrip Structure on LTCC Substrate

Young Chul LEE  Ki Chan EUN  Chul Soon PARK  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.5   pp.867-869
Publication Date: 2003/05/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
Keyword: 
void cavity,  LTCC,  resonator,  microstrip line,  dielectric loss,  

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Summary: 
We have devised and implemented a new low-loss microstrip transmission structure on LTCC substrate by including void cavities in the dielectric layer between conductor strip and ground plane. Measurements of λ/4 T-resonators with the novel microstrip structure reveal total loss of 0.0126dB/mm and Q-factor of 267 at 15.85GHz. The dielectric loss is analyzed as small as 0.0005dB/mm at the frequency, and that is equivalent to an improvement of a factor of 18 compared to the conventional LTCC microstrip structure. The proposed microstrip structure with the embedded void cavities is suited for low loss LTCC based RF-MCM applications.