Browsing by Author "Kuo, C. -N."

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A SILICON-BASED PARABOLIC SUB-THz REFLECTOR ANTENNA FOR GAIN ENHANCEMENT AND NEAR-FIELD FOCUS APPLICATIONS
(2018-01-01)
Hsu, M. -T.
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Chiu, T. -Y.
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Wu, S. -Y.
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Cheng, Y. -T.
;
Li, C. -H.
This paper presents the first silicon-based parabolic Sub-THz reflector antenna with corresponding fabrication processes. The antenna is side fed with an on-chip 340 GHz patch antenna on a reflector made of stacked micromachined silicon substrates with a parabolic-shaped Kapton film coated with aluminum on top. The antenna with a size of 18 x 18 x4 mm(3) and an aperture of similar to 10mm can be easily integrated with monolithic microwave integrated circuit sources. i.e. 40 um CMOS triple-push oscillator in this case, and exhibit not only similar to 12.4 dB directive gain enhancement and 4.34 degrees HPBW (Half Power Beam Width) for far field radiation but also an excellent near field focus characteristic with a 28.5 mm depth of field (DOF).
Fully integrated bio-chip with high sensitivity for electrochemical sensing application
(2019-04-18)
Chen, W. -H.
;
Chang, C. -H.
;
Shih, H. -Y.
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Chiu, T. -W.
;
Kuo, C. -N.
This Letter presents a fully integrated bio-system with the property of high sensitivity for electrochemical detection, which can intrinsically measure electrochemical characteristics with cyclic voltammetry. In normal circumstances, ultra-low electrolytes exist in tissue solution, which is difficult to accurately detect the oxidation/reduction signals, limited by the innate circuit and liquid noise. Hence, the conventional topology of the potentiostat circuit is improved and proposed in this Letter to remove the required analogue-to-digital converter (ADC). The overall operational mechanism of the potentiostat behaves like a single-slope ADC, which achieves a compact, easily implemented, and low-noise design. Additionally, the effective capacitance of potentiostat and liquid resistance make an RC integration to further suppress out-of-band noise, thereby enabling the low-electrolyte detection and improving detecting sensitivity. To simulate the low-electrolyte environment, only 0.01 M (M = mol/l) phosphate buffered saline background solution is used and required to demonstrate its feasibility of the concept. The measured results show the sensor chip with high sensitivity to sense resistive variation of electrochemical action in low electrolytes.