Summary
International Symposium on Antennas and Propagation
2005
Session Number:2POS-D
Session:
Number:2POS-D-3
STABILITY CHARACTERIZATION OF CIRCUIT AND STRUCTURE IN CERAMIC DUALBAND ANTENNA SWITCH MODULE BY PROBING METHOD
Joshua Yoo, Jung-Geun Lee, Myung-Jae Yoo, Woo-Sung Lee,
pp.-
Publication Date:2005/11/3
Online ISSN:2188-5079
Summary:
A compact antenna switch module for GSM/DCS dualband applications based on a multilayer low temperature co-fired ceramic (LTCC) substrate is presented. Its size is 4.5×3.2×0.8mm3 and insertion loss is lower than 1.0dB at Rx mode and 1.2 dB at Tx mode. To verify the stability of the developed module to the process window, each block that is diplexer, LPF’s and bias circuit is measured by probing method in the variation with the thickness of ceramic layer and the correlation between each block is quantified by calculating the VSWR. In the mean while, two types of bias circuits - lumped and distributed - are compared. The measurement of each block and the calculation of VSWR give good information on the behavior of full module. The reaction of diplexer to the thickness is similar to those of LPF’s and bias circuit, which means good relative matching and low value of VSWR, so total insertion loss is maintained in quite wide range of the thickness of ceramic layer at both band. And lumped type bias circuit has smaller insertion itself and better correspondence with other circuit than distributed stripline structure. Evaluated ceramic module adopting lumped type bias circuit has low insertion loss and wider stability region of thickness over than 6um and this can be suitable for the mass production. Stability characterization by probing method can be applied widely to the development of ceramic modules with embedded passives in them.