Browsing by Author "Chen, Yi-Tang"

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A Miniature 92-95 GHz On-chip Slow-wave Branch-line Coupler
(2018-01-01)
Chen, Yi-Tang
;
Chiu, Chia-Sung
;
Chuang, Chia-Wei
;
Chen, Kun-Ming
;
Huang, Guo-Wei
A miniature 92-95 GHz on-chip branch-line coupler (BLC) employing a slow-wave microstrip line is proposed herein. The ground metal plane beneath the signal line is periodically slotted, and the coupler can be highly miniaturized owing to the short wavelength characteristic of the transmission line with slow-wave structure. The size of the slow-wave BLC is 250 mu m X 250 mu m, which is 39% of the size of conventional BLCs.
Preparation of a New Proton Conducting Silicon Membrane for Miniature Fuel Cells
(2009-10-01)
Chen, Yi-Tang
;
Lin, Sean S-Y.
;
Kim, Sung-O
;
Ha, Su
;
光電工程學系
The membranes based on silicon substrate filled with Nafion (R) have been fabricated as a proton exchange membrane for miniature fuel cells. This fabrication utilizes the micromachining procedures including photo-lithography, plasma-enhanced chemical vapor deposition (PECVD), and dry and wet etching processes. The device size of the silicon membrane filled with Nafion (R) was 1 cm x 1 cm. The pores were smaller than 500 nm. ne cross-sectional shape of the silicon membrane was an inverse pyramid structure to improve its mechanical strength and to enhance its surface treatment process. This technique combines the advantages of Nafion (R) with a good proton conductivity and silicon membrane, such as easy serial and parallel integration, respectively.