Taoyuan City, Taiwan
Taoyuan City, Taiwan

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Chang S.C.,National Chiao Tung University | Wu Y.S.,National Chiao Tung University | Chang N.,Electronics Testing Center
ECS Transactions | Year: 2012

The microstructure and electrical properties of p-GaAs/n-GaAs bonded interface were investigated. It was observed that when bonding temperature increased from 600 to 800°C, the thickness of oxide layer decreased. Current-voltage characteristic shows typical diode behaviors in these temperature ranges. © The Electrochemical Society.


Tsai J.-C.,Electronics Testing Center | Donglin M.,China Institute of Metrology | Tang Y.-C.,Bureau of Standards Metrology and Inspection BSMI | Huang K.-P.,Electronics Testing Center | Lin L.-Y.,Bureau of Standards Metrology and Inspection BSMI
2016 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2016 | Year: 2016

It is well known that mutual coupling effect and problems exist between transmitting and receiving antennas. One factor is the coupling effect between antennas and masts. It can be more than 1 dB for omni-directional antennas with vertical polarization. This effect can be improved by utilizing the average method of changing distance between antennas and antenna mast. According to the reference site method (RSM) proposed in the CISPR 16-1-4-2012, a comparison test is made between the Bureau of Standards, Metrology & Inspection (BSMI), Taiwan and the National Institute of Metrology (NIM), China. The RSM and geometrical specific correction factor from the Annex G & H of ANSI C 63.5-2006 was also introduced into this comparison. It shows that the average method can improve the effect of mutual coupling between antennas and masts to 0.5 dB. This case study will discuss the theory of the average method and the measured result. The result will help to improve the measurement uncertainty for the validation of semi-anechoic chambers. © 2016 IEEE.


Fan S.-K.S.,National Taipei University of Technology | Fan C.,Ming Chi University of Technology | Yang J.-H.,Ming Chi University of Technology | Yang J.-H.,Electronics Testing Center | Liu K.F.-R.,Ming Chi University of Technology
Journal of Cleaner Production | Year: 2013

This paper evaluates the recycling rates, costs as well as the disassembly time of a notebook at its end-of-life stage through Prodtect 1.3 calculation using data collected during disassembly processes. The results show that the disassembly and recycle of a notebook at its end-of-life stage may exert positive influence on the environment by introducing the eco-design concept to the product re-design, thus creating more resource-conserving products and enhancing recycle efficiency. Through proper disassembly and disposal processes, a notebook at its end-of-life stage may yield the recycling value of 1.61 EUR. Furthermore, the most revenue of 1.44 EUR is attributed to the recycle of metallic and plastic parts, the major constituents of a notebook. As for the time required for disassembly, the Top Case, Motherboard and LCD (CHI MEI) are the three most time-taking parts in the disassembly process, and their total times required are 133, 67 and 64 s, respectively. Prodtect calculation to assess notebook recycling benefits provides a new set of guidelines for the notebook designer to propose potential modifications of the re-design for reducing the environmental impacts arising from the next-generation products. © 2012 Elsevier Ltd. All rights reserved.


Chou P.-J.,National Chiao Tung University | Lin Y.-W.,Electronics Testing Center | Chang C.-Y.,National Chiao Tung University
IEEE Transactions on Microwave Theory and Techniques | Year: 2015

Novel full-and half-symmetric rat-race ring hybrid structures are proposed, in which the impedance transforming property can be implemented. Impedance transformation implies that the impedances of the input and output ports can be different. The conventional even-and odd-mode partition and analysis method cannot be applied to the proposed half-symmetric circuits; therefore, an analysis method is developed. The rat-race ring is exactly synthesized on the basis of a newly deduced high-pass prototype that is based on Richards theorem, which allows the user-defined specifications to be satisfied. Three hybrids are synthesized as examples-a sixth-order full-symmetric hybrid with a bandwidth of 116% and a return loss of 20 dB, a fifth-order half-symmetric hybrid with a 100% bandwidth and 25-dB return loss, and a fifth-order impedance-transforming half-symmetric hybrid with an output port impedance of 70 \Omega, a 100% bandwidth, and 20-dB return loss. The first and second hybrids are implemented to verify the method. A comparison of the measured and simulation results indicates good agreement. © 2014 IEEE.


Hsieh C.-Y.,National Chiao Tung University | Lin B.-W.,National Chiao Tung University | Cho H.-J.,National Chiao Tung University | Wang B.-M.,National Chiao Tung University | And 2 more authors.
IEEE Photonics Technology Letters | Year: 2012

A relatively simple and easy and inexpensive liquid-phase deposition (LPD) method is employed to introduce nanoscale silica hemispheres on sapphire substrates for fabricating a nano-patterned sapphire substrate (NPSS). Compared with GaN grown on sapphire without any pattern, the NPSS-GaN film is of much better quality as observed by scanning electron microscopy, transmission electron-microscopy, X-ray diffraction, cathodoluminescence, and photoluminescence. This is because GaN is initiated from the c-plane instead of the LPD-silica surface. In addition, many dislocations within the NPSS-GaN bend toward the patterns, or end at the GaN/void interfaces. © 2012 IEEE.


Tang Y.-C.,Bureau of Standards | Chen J.-S.,Bureau of Standards | Lee C.-H.,Electronics Testing Center | Chiu C.-N.,Da - Yeh University
IEEE International Symposium on Electromagnetic Compatibility | Year: 2014

In this paper, a case study on the merit of adding the LISN for radiated-emission (RE) testing is demonstrated. For this study, a site source is created and considered as the device under test. This site source, activated by AC power, can generate harmonic reference signals ranging from 30 MHz to 1 GHz. The site source is then measured for numerous times. A large variation among these measurements is observed. By adding several ferrite cores to the power cord of the site source, the variation can be highly reduced. This implies that the conducted noise onto the power cord may contribute a lot to the uncertainty, since the conducted noise will radiate differently as the impedance of the power system is varied. Therefore, it may conclude that the variation may also be reduced if the LISN is added between the site source and the power system even without using ferrite cores. As the conducted noise along the power cord is unavoidable, the LISN will provide a constant impedance making the noise radiated in the same manner. Based on many detailed measurements, the consistency of the RE testing for the site source is indeed enhanced by adding the LISN. © 2014 The Institute of Electronics, Information and Communication Engineer.


Lee C.-H.,Electronics Testing Center | Yang T.-Y.,Electronics Testing Center | Hsieh H.-C.,Bureau of Standards | Chen J.-S.,Bureau of Standards | Chiu C.-N.,Da - Yeh University
IEEE International Symposium on Electromagnetic Compatibility | Year: 2014

In this paper, a new and low-cost design of site source with long-term stability is proposed. The site source is especially suitable for the daily site checking and the consistency confirming at different test sites. For these applications, the site source is highly required to be stable due to various test sites and long-term usage. Two crystal driven oscillators together with well-designed circuits, powered by AC, can generate fast and stable periodic trapezoidal waveforms, resulting in harmonic signals ranging from 150 kHz to 1 GHz. This indicates that the site source can be applied not only for the radiated-emission (RE) test from 30 MHz to 1 GHz but also for the conducted-emission (CE) test from 150 kHz to 30 MHz. For demonstration, the site-source prototype was created and measured. The measurement was performed inside a standard 10-m semi-anechoic chamber to show the attractive performance of frequency accuracy, outputpower stability and radiation symmetry of the newly developed site source. © 2014 The Institute of Electronics, Information and Communication Engineer.


Chang D.-C.,Oriental Institute of Technology | Lee C.-H.,Yuan Ze University | Lee C.-H.,Electronics Testing Center | Yang T.-Y.,Electronics Testing Center
Progress in Electromagnetics Research Symposium | Year: 2013

In this paper, a high performance three dimensional radar image with size 1.5 meter by 1.5 meter and far field RCS versus aspect angle is performed by using the spherical near field range. By using the near field to far field transformation, the high fidelity radar image and radar cross section (RCS) can be generated. The radar system is impulse time domain system. The pulse width and pulse repetition frequency of radar are 30 ps and 1MHz respectively. Figure 2 shows the simulation image result of 12 scatter points target model, distributed on 1.5 meter by 1.5 meter plane, by using the near field spherical range. Figure 2 shows the structure of near field scanner. The target is mounted on the horizontal positioner. By the rotation of the target, the near field ISAR image can be generated at special aspect angle. The impulse time domain radar system is moved along the arch. By using the radar movement along the arch and the target rotation on the postioner the three dimensional near field ISAR radar image can be generated. By using the field transformation from near field to far field, the high performance radar image and RCS can be generated. Copyright © 2013 The Electromagnetics Academy.


Wang B.-B.,National Kaohsiung University of Applied Sciences | Chang C.-F.,Electronics Testing Center | Li Y.-R.,National Kaohsiung University of Applied Sciences | Chau T.N.,National Kaohsiung University of Applied Sciences | Yang W.-D.,National Kaohsiung University of Applied Sciences
Applied Mechanics and Materials | Year: 2012

This study successfully synthesized manganese-doped calcium zirconate phosphor and manganese-doped strontium zirconate phosphor using the sol-gel method. We employed X-ray powder diffraction and fluorescence spectroscopy to analyze the crystal structure and spectral characteristics of both phosphors. In X-ray powder diffraction analysis, data related to manganese-doped calcium zirconate phosphor and manganese-doped strontium zirconate phosphor were compared using X-ray diffraction comparison software to confirm the crystal structures of both phosphors. The crystal structure of manganese-doped calcium zirconate phosphor was in accordance with orthorhombic perovskites belonging to the Pnma{62} space group. The lattice parameters were a=5.762 Å, b=8.017 Å, and c=5.591 Å; c/a=0.97; volume=258.3 Å3, and density=4.611 g/cm3. The crystal structure of manganese-doped strontium zirconate phosphor conformed to orthorhombic perovskites belonging to the Pnma{62} space group, and the lattice parameters were a=5.818 Å, b=8.204 Å, c=5.797 Å; c/a=0.996; volume=276.7 Å3, and density=5.446 g/cm3. Fluorescence spectroscopy indicated that the primary broadband peak of manganese-doped calcium zirconate phosphor was located at 396.6 nm in the excitation spectrum corresponding to the 4T2(4G)→4T1( 4P) energy level transition. In the emission spectrum, the primary broadband peak was located at 596.6 nm, corresponding to the 4T2(4D)→4T2( 4G) energy level transition. For manganese-doped strontium zirconate phosphor, the primary broadband peak was located at 496.6 nm in the excitation spectrum and at 696.6 nm in the emission spectrum, corresponding to the 4T1(4G)→4T2( 4D) and 4E(4G)→4T1(4 G) energy level transitions, respectively. © (2012) Trans Tech Publications, Switzerland.


Wang B.-B.,National Kaohsiung University of Applied Sciences | Chang C.-F.,Electronics Testing Center | Yang W.-D.,National Kaohsiung University of Applied Sciences
International Journal of Minerals, Metallurgy and Materials | Year: 2013

γ-LiAlO2:Mn2+ phosphor was synthesized using the cellulose-citric acid sol-gel method, and its light emission and energy transfer properties were investigated. Excitation and emission spectrum analysis revealed a decrease in intensity of the spectrum as the amount of Mn 2+ doping increased. Blasse's equation determined the maximum distance for energy transfer between Mn2+ ions as 4.3142 nm. Dexter's theory verifies that the mechanism of energy transfer between Mn2+ ions conforms to an electric dipole and electric quadrupole interaction. © 2013 University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.

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