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http://dx.doi.org/10.6109/JKIICE.2009.13.7.1267

Design and Fabrication of a LTCC Diplexer for GSM/CDMA Applications  

Kim, Tae-Wan (목포해양대학교 해양전자통신공학부)
Lee, Young-Chul (목포해양대학교 해양전자통신공학부)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.13, no.7, 2009 , pp. 1267-1271 More about this Journal
Abstract
In this paper, a diplexer circuit to separate GSM from CDMA band is designed using a LTCC (Low Temperature Cofired Ceramic) multi-layer technology. In order to increase a integration capability of the diplexer, it is designed using 3-dimensional (3-D) multi-layer compact inductor and capacitors in e-layer LTCC substrate with a relative dielectric constant of 7. In order to achieve high selectivity of the bands, a shunt capacitor and inductor are designed in the high-pass filter (HPF) and low-pass filter (LPF), respectively. The size of the fabricated diplexer including CPW pads is 3,450 ${\times}$4,000 ${\times}$694 ${\mu}m^3$An insertion loss (IL) and return loss in GSM band are less than -1.35dB and more than -5.66dB,respectively. In the case of CDMA band, the IL of -1.54dBandRLof above -9.30dBare archived.
Keywords
LTCC; mulil-band; diplexer; low-pass filter; high-pass filter;
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