Cheng-Yuan Hung

Tung Fang Design University, Kao-hsiung-shih, Kaohsiung, Taiwan

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Publications (59)35.23 Total impact

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    ABSTRACT: This paper reports the microstructure, luminescence and thermal stability properties of the NaSr1-xPO4:xTb3+ powders (x = 0.008, 0.01, 0.02, 0.04 and 0.06) via the conventional solid-state sintering at 1200 °C for 5 h. The X-ray diffraction result verifies all diffraction peaks are pure phase of NaSrPO4. The luminescence results show that the NaSrPO4:xTb3+ powders mainly excited at 370 nm have a series of the emission-states, related to the typical 4f → 4f intra-configuration forbidden transitions of Tb3+, and a major emission peak of around 546 nm. The concentration quenching of the NaSr1-xPO4:xTb3+ phosphors is appeared at x = 0.02. The decay time values of the NaSr1-xPO4:xTb3+ phosphors for the 5D4 state of the Tb3+ are around 3.30 ms to 3.60 ms. It is also found the chromaticity coordinate of NaSrPO4:Tb3+ phosphor varies with the increase of the concentration of Tb3+ ions from blue to green. Moreover, the thermal stability of the NaSrPO4:xTb3+ phosphors is slightly better than that of conventional YAG phosphors.
    Optical Materials 10/2013; 35(12):2183-2187. · 2.08 Impact Factor
  • Cheng-Yuan Hung, Min-Hang Weng
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    ABSTRACT: In this paper, the impact of substrate resistivity on the functional passive components of radio frequency (RF) complementary metal–oxide–semiconductor circuits for system-on-a-chip applications is investigated. This paper carefully extracted the dielectric constant and loss tangent of the silicon substrate with different substrate resistivities by using the aluminum coplanar waveguide. The different dielectric relaxation (cutoff) frequencies as a function of silicon substrate resistivity are compared under different requirements for substrate noise isolation, RF passive device design, and 3-dB-level RF passive device design. It is found that the new dielectric relaxation frequencies of the silicon substrate, which can be used for the implementation of 3-dB-level RF passive device design, are much higher than for the substrate noise isolation. Finally, the integrated millimeter-wave filter example, a low-pass filter with a filter cutoff frequency of $f_{c} = \hbox{31}\ \hbox{GHz}$, was designed and evaluated directly on the silicon substrates with different resistivities. Experimental results of the fabricated filter showed good agreement with the simulated results and designed concept.
    IEEE Transactions on Electron Devices 01/2012; 59(4):1164-1171. · 2.06 Impact Factor
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    ABSTRACT: We proposed a fractal-based dual-mode bandpass filter (BPF) using a standard CMOS process for application of 60GHz WirelessHD system. We first investigated the effect of coupling feedlines of I/O ports set at different layer of M3 and M4 layer on the transmission loss of the resonator, and verified the nature coupling of fractal-based dual-mode filter. Experimental result shows that the designed filter with a fractional-bandwidth (FBW) of 23%, an insertion loss about 7dB and return loss larger than 10dB. Additionally, two transmission zeros are appeared at the passband edges, thus much improve the selectivity of the proposed CMOS BPF. The result indicates that fractal-based structure is feasible and can meet the requirement in the mm-wave application.
    Microelectronics Journal. 01/2011; 42:1252-1256.
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    ABSTRACT: This article presents a new design of wideband spurious suppression of dual-mode band-pass filter (BPF) using defected cascaded resonators (DCRs).The pattern of the DCRs is similar with that of the conventional low-pass stepped impedance resonator, whereas it is etched in the ground. It is verified that adding DCRs in planar BPF can effectively provide a very wideband range for spurious suppression. The dual-mode BPF is designed at center frequency (f0) of 5.2 GHz, and has a very wideband spurious suppression below 30 dB as far as over 5f0 when using the DCRs. The measured results have a good agreement with the EM simulated results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1694–1697, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25332
    Microwave and Optical Technology Letters 05/2010; 52(8):1694 - 1697. · 0.59 Impact Factor
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    ABSTRACT: In this article, the fabrication of a compact and high performance semi-lumped coplanar waveguide high-pass filter (CPW-HPF) implemented on high resistivity silicon (HRS) substrate is proposed.The design procedure and the equivalent circuit of the proposed semi-lumped CPW-HPF is discussed. The filter structure is simple, and the performances are fairly good. This designed filter at cutoff frequency fc of 21.6 GHz has very good measured characteristics including a balance passband of S21 of −0.5 ± 0.3 dB and a sharp band edge rejection. Experimental results of the fabricated filter show a good agreement with the predicted results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1150–1153, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25116
    Microwave and Optical Technology Letters 04/2010; 52(5):1150 - 1153. · 0.59 Impact Factor
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    ABSTRACT: In this paper, the microwave performance of coplanar waveguides (CPWs) fabricated on high-resistivity silicon (HRS) substrates with various polysilicon film thicknesses was investigated. CPWs were fabricated on p-type silicon substrates with resistivities of 6000-8000 ¿-cm. Polysilicon films with thicknesses ranging from 100 to 900 nm were deposited by LPCVD, in which a 300 nm-deposited polysilicon was generally used as surface passication layer on the HRS substrates. Subsequently, the oxide layer was deposited on the polysilicon layer by PECVD, and a pure aluminum film was evaporated and patterned to form the 50-¿-CPW test structures. The CPWs were characterized through S-parameter measurements for up to 40 GHz by using an HP-8510 network analyzer. Experimental results show that the microwave attenuation loss can be influenced by a small variation of polysilicon layer thickness, especially when the thickness is smaller. Thicker polysilicon layers lead to higher grain boundary density, hence, free carriers can be rapidly trapped within grain boundary interfaces of the polysilicon, and the surface recombination velocity can be enhanced, thus, reducing the conductivity and bias-dependence of the surface layers. Furthermore, the bias effect on the HRS with various polysilicon thicknesses was taken into account as well.
    Semiconductor Device Research Symposium, 2009. ISDRS '09. International; 01/2010
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    ABSTRACT: In this paper, we presented a design of a triple-passband filter capable of operating at 1.57 GHz GPS band and 2.47/3.57 GHz of WiMAX system. The proposed filter mainly composes of half-wavelength input/output (I/O) open-end microstrip lines, fold stepped impedance resonators, and open-loop ring unit impedance resonators. By selecting properly the coupling position between the I/O lines and the resonators, the passband of the tri-band filter can be well created or eliminated. Experimental results show a good agreement with the simulated results.
    01/2010;
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    Ru-Yuan Yang, Hon Kuan, Cheng-Yuan Hung, Chang-Sin Ye
    Progress in Electromagnetics Research-pier - PROG ELECTROMAGN RES. 01/2010; 105:93-102.
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    ABSTRACT: We presented a high performance diplexer is designed and fabricated for Global System for mobile communications (GSM) applications in this paper,. Two square open-ring bandpass filters (BPFs), operated at 0.9 GHz and 1.8 GHz, and are used for the diplexer mainly. The size reduction, the deep and wide stop-band from 0.51 GHz to 4.9 GHz can be obtained when modifying the stepped-impedance resonator (SIR) in the BPFs, The improved passband selectivity is obtained since several transmission zeros are located at the passband edges The simulated and measured results have a good agreement with the proposed design concept.
    01/2010;
  • Hung-Wei Wu, Min-Hang Weng, Cheng-Yuan Hung
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    ABSTRACT: A novel ultra wideband (UWB) bandpass filter (BPF) with dual notch bands using the coupled stepped impedance resonator (SIR) is presented. The filter consists of a square-etched multi-mode resonator (MMR) and two coupled SIRs to provide dual notch bands at 5.2 and 5.8 GHz over the standard UWB frequency range. The |S21|-magnitude and the frequency positions of the notch bands can be determined by tuning the dimensions of the coupled SIRs. The designed procedures are discussed and good agreement between the measurement and EM simulation are compared.
    01/2010;
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    ABSTRACT: In this article, design of a microstrip ring-like diplexer for Bluetooth and ultrawide band application is presented. Two ring-like bandpass filters, operated at 2.4 and 4 GHz, are combined together to form the proposed microstrip diplexer. Several transmission zeros located at the passband edges are introduced to improve the passband selectivity. High isolation between the two passband greater than 28 dB is achieved in this study. The designed diplexer is investigated numerically and experimentally. Measured results show a good agreement with the simulated analysis. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1518–1520, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24358
    Microwave and Optical Technology Letters 03/2009; 51(6):1518 - 1520. · 0.59 Impact Factor
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    ABSTRACT: We proposed a novel dual-mode dual band bandpass filter (BPF) operating at 2.4/5.7 GHz by using a right cross-slotted patch resonator (RCSPR) combined with a pair of square etched areas (SEAs). A pair of right crossed slot embedded in the center of the patch resonator is used to tune the resonant modes having 2.4/5.7 GHz responses. In this design, a pair of SEAs etched within the RCSPR is provided to be the perturbation element to generate the filter performance with the transmission zeros near the passband edges. It is shown that the fabricated filter has good dual-band performances at 2.4/5.7 GHz with high selectivity, narrow bandwidth, and very sharp attenuation rate due to the existence of the transmission zeros. Measured results of the fabricated BPF have a good agreement with the full-wave simulation results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 491–494, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24078
    Microwave and Optical Technology Letters 01/2009; 51(2):491 - 494. · 0.59 Impact Factor
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    ABSTRACT: In this article, the equivalent circuit of the ring-like resonator with different impedance is simply modeled as the parallel GLC lumped element. We then investigated the equivalent lumped elements of the ring-like resonator with different width of the ring (i.e., different impedance of the ring) by using the transmission-line analysis. The resonant frequency shifts to higher frequency when the width of the ring structure is increased. It is noted that when the width of the ring structure is large enough, the resonant frequency of the ring structure will be very close with that of the patch structure. The circuit simulated results from the extracted element values are in good agreement with the full-wave simulation results and the measured results. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 615–618, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24130
    Microwave and Optical Technology Letters 01/2009; 51(3):615 - 618. · 0.59 Impact Factor
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    ABSTRACT: Miniaturization of the resonator is significant for a compact filter. To meet such requirement, several techniques, for instance, using the high permittivity material or using the step-impedance resonator with multiple resonant modes, can be used. Dual-mode resonators have advantageous features for the bandpass pass filter (BPF) design, such as excellent unloaded Q values, size compactness, low radiation loss and ease of design because transmission-line theory and design tools can easily be employed. Therefore, in this paper, we present a novel miniature dual-mode BPF based on the fractal geometry resonator. The proposed fractal geometry is introduced from the Sierpinski square and described by the generated method. A 3rd order Sierpinski square is adopted as the resonator structure since it has a high quality factor, suitable for the proposed dual mode BPF design. The design procedure is discussed in the following. A dual mode BPF at 2.4 GHz is characterized by using the full-wave electromagnetic (EM) simulator IE3D and verified by the experimented results.
    Microwave Conference, 2008. APMC 2008. Asia-Pacific; 01/2009
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    ABSTRACT: Original published in Microwave Opt Technol Lett 50:1469–1471, 2008. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 583, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24089
    Microwave and Optical Technology Letters 01/2009; 51(2):583-583. · 0.59 Impact Factor
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    ABSTRACT: In this letter, a lumped-element bandpass filter (BPF) fabricated on the high-dielectric constant piezoelectric substrate using the interdigital capacitor and the bonding-wire inductor is designed and implemented. The lead-free piezoelectric substrate of Bi0.5Na0.5TiO3 (BNT) ceramics prepared by a conventional solid-state reaction method and sintered at temperatures 1100°C was used as substrate. The resonant frequency could be easily controlled by varying the lengths of silver bonding wire. The design procedure using the analysis of different bond-wire lengths of silver wire is described in this work. A lumped-element BPF with a central frequency at 0.9 GHz and a fractional bandwidth of 31.53% are fabricated and measured using the network analyzer. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2594–2597, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23706
    Microwave and Optical Technology Letters 09/2008; 50(10):2594 - 2597. · 0.59 Impact Factor
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    ABSTRACT: In this article, a compact and low loss ring ultra-wideband (UWB) bandpass filter (BPF) with an enlarged perturbation element is designed and implemented on FR4 substrate. This filter at center frequency f0 of 4.16 GHz has presented almost very good measured characteristics including the bandwidth of 3.04–5.27 GHz (3-dB fractional bandwidth of 54%), a low insertion loss of 0.8 dB, a high passband selectivity due to two transmission zeros in the passband edges, and a low group delay varied between 0.1 and 0.6 ns. Experimental results of the fabricated filter show a good agreement with the predict results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2317–2319, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23639
    Microwave and Optical Technology Letters 06/2008; 50(9):2317 - 2319. · 0.59 Impact Factor
  • Cheng-Yuan Hung, Min-Hang Weng, Ru-Yuan Yang
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    ABSTRACT: In this article, a bandpass filter with a wide stopband is proposed for the wireless local area network (WLAN) system. The filter is mainly composed of a dual-mode bandpass filter (DM-BPF) and a controllable bandstop structure (CBS). By using the CBS, multiple transmission zeros can be located on the spurious responses of the DM-BPF. The design procedure is discussed in detail in this article. The designed filter is fabricated and measured. Measured results have a good agreement with the simulated results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2214–2216, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23610
    Microwave and Optical Technology Letters 05/2008; 50(8):2214 - 2216. · 0.59 Impact Factor
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    ABSTRACT: In this article, a simple method to design a high-performance ring-wideband bandpass filter centered at 4 GHz without the perturbation element is presented. The coupling between the two orthogonal modes is accomplished by combining the resonant mode of the ring resonator and the resonant mode of the coupling line having a length about λg/4 with respect to 4 GHz. This fabricated filter at center frequency f0 of 4 GHz has showed very good measured characteristics, including a 3-dB fractional bandwidth of 40%, a very low insertion loss of 0.3 ± 0.1 dB, a stopband from 6 to 10 GHz, and a very high selectivity. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2025–2027, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23577
    Microwave and Optical Technology Letters 05/2008; 50(8):2025 - 2027. · 0.59 Impact Factor
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    ABSTRACT: A miniature and harmonic control patch dual-mode bandpass filter (BPF) with transmission zeros for application of global positioning system (GPS) is proposed. The right crossed-slots of the patch resonator are used to determine the main passband frequency of the BPF. In this study, by using a pair of square etched areas (SEAs) acted as perturbation elements, the dual mode filtering performance can be excited and two transmission zeros located on either side of the passband are clearly observed. It is found that two transmission zeros can improve the selectivity of the BPF as well as the stopband rejection effectively, thus avoiding the interference from other communication systems. The measured results of the fabricated BPF are in good agreement with full wave simulation. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2161–2163, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23604
    Microwave and Optical Technology Letters 05/2008; 50(8):2161 - 2163. · 0.59 Impact Factor