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🏛️國立陽明交通大學機構典藏

Access type: Metadata onlyAuthor: search.filters.author.Kuo, Jen-Tsai

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    Dual-Mode Dual-Band Ring Resonator Bandpass Filter With Transmission Zeros
    (2010-01-01)
    Kuo, Jen-Tsai
    ;
    Lin, Tsu-Wei
    ;
    電信工程研究所
    ;
    Institute of Communications Engineering
    Dual-mode dual-band bandpass filters are developed based on a single ring resonator. The ring is composed of two half-wave stepped-impedance resonators with short-circuited ends, which are connected to ground vias by short high-impedance sections, providing inductive coupling between the resonating modes and hence bandwidth control. Experimental filters are fabricated and measured for validation. Skew-symmetric feed structure is employed in the first circuit for enhancing the frequency selectivity around the second band. Source-load coupling is incorporated with the second design to create transmission zeros on both sides of the two passbands, greatly improving the performance in transition bands. The measured results show good agreement with the simulation.
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    Broadband Microstrip Impedance Transformer
    (2016)
    Kuo, Jen-Tsai
    ;
    Chang, Yu-Hsien
    ;
    Chung, Shyh-Jong
    ;
    電信工程研究所
    ;
    Institute of Communications Engineering
    A broadband impedance transformer is proposed for microstrip realization and to release the tight gap size (30 mu m) required for coupled-stripline. Design curves of the transformer are obtained by solving the analytical equations derived from the transmission line theory. Two transformers are fabricated and measured. One is designed for a 1: 2 ratio and return loss better than 30 dB over a fractional bandwidth Delta=68%, and the other is a 1: 2.8 transformer with vertical bar S-11 vertical bar < -25 dB over a bandwidth of Delta = 71%. In realization, the metal traces are folded so that the circuit sizes are less than lambda/8x lambda/8. Good agreement between measured and simulation is obtained.
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    Ultra-Compact Shorted Ring Resonator Bandpass Filter With Wide Upper Stopband
    (2014)
    Lin, Tsu-Wei
    ;
    Kuo, Jen-Tsai
    ;
    Chung, Shyh-Jong
    ;
    傳播研究所
    ;
    Institute of Communication Studies
    An ultra-compact second-order bandpass filter with stopband extension is implemented with shorted ring resonators. In the design, the two resonances of the structure are separately controlled by electric and magnetic coupling between the rings. Two transmission zeros on both sides of the passband are created through the multipath effect between the 1/0 ports. Circuit miniaturization is accomplished by attaching an open low-impedance stub to each shorted ring. The upper stopband with a rejection better than 30 dB is extended to 4.32 times the passband frequency. The circuit area is only 8.8% of that of a conventional dual-mode ring resonator filter. Measured results show good agreement with the simulation.
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    Design of cross-coupled quarter-wave SIR filters with plural transmission zeros
    (2006)
    Hsu, Ching-Luh
    ;
    Kuo, Jen-Tsai
    ;
    電信工程研究所
    ;
    Institute of Communications Engineering
    A cross-coupled bandpass filter is designed with quarter-wave stepped-impedance resonators (SIRS) on a single circuit plane. The entire circuit has not only a compact area since half-sized SIRS are used, but also a wide upper stopband because the first spurious peak occurs at a frequency much higher than the passband. Plural transmission zeros on both sides of the passband can be realized by non-adjacent couplings and tapped input/output. Two-port Z-parameters are employed to formulate the analysis of the transmission zeros. An experimental filter is fabricated and measured to validate the design.
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    New Miniaturized Ring Resonator Bandpass Filter With Wide Upper Stopband
    (2013)
    Lin, Tsu-Wei
    ;
    Kuo, Jen-Tsai
    ;
    Chung, Shyh-Jong
    ;
    傳播研究所
    ;
    Institute of Communication Studies
    A new configuration for ring resonator is proposed for bandpass filter design with size reduction and stopband extension. The planar self-coupled ring is twisted at its middle and a short CPW section is implemented in the ground plane for the three-dimensional interconnection. The resonator has two resonance modes and the filter possesses one transmission zero on the high side of the passband. With a pair of open low-impedance stubs attached to the ring, the circuit has an area of only 9.65% of that of the conventional ring resonator filter, and the upper stopband is extended up to higher than five times the center frequency. Measured results of a fabricated prototype circuit show good agreement with the simulation.
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    Design of Dual-Band Branch Line Couplers With Circuit Miniaturization
    (2008)
    Hsu, Ching-Luh
    ;
    Kuo, Jen-Tsai
    ;
    電信工程研究所
    ;
    Institute of Communications Engineering
    Design of a dual-band branch line coupler with a very compact size is proposed. For reducing circuit area, stepped-impedance sections are used. Folded open stubs are attached to each stepped-impedance section at its both ends for the dual-band purpose. Circuit dimensions and geometrics are designed in order to achieve the best circuit miniaturization. For validation, measured results of an experimental circuit are compared with simulation data.
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    Miniaturized Microstrip Quadruple-Mode Ring Resonator Filter With Quasi-Elliptic Passband
    (2013)
    Lin, Tsu-Wei
    ;
    Kuo, Jen-Tsai
    ;
    Chung, Shyh-Jong
    ;
    傳播研究所
    ;
    Institute of Communication Studies
    A compact quadruple-mode ring resonator is proposed for synthesis of a quasi-elliptic bandpass filter. The resonator is composed of four half-wavelength rings connected to a single grounded via. For miniaturization, the ring areas are overlapped and the crossovers are implemented by short CPW sections in the ground plane. As a result, the resonator uses about 50% area of a conventional dual-mode ring resonator filter. Among the four rings, all coupling coefficients are of inductive type realized by shorted high-impedance and coupled-line sections. Two zeros are created by capacitive source-load coupling, and the response is synthesized by the coupling matrix method. Agreement between simulation and measurement results of a realized circuit validates the approach.
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    Filtering Rat-Race Coupler With Transmission Zeros Using Compact Miniaturized Hairpin Resonators
    (2015)
    Lin, Tsu-Wei
    ;
    Wu, Jen-Yi
    ;
    Kuo, Jen-Tsai
    ;
    傳播研究所
    ;
    Institute of Communication Studies
    A new compact filtering rat-race coupler is implemented by a 2x2 cross coupled configuration based on compact miniaturized hairpin resonators. Passband responses with transmission zeros are synthesized by an (n+4)x(n+4) coupling matrix. The zeros are created in the output ports by adding source-load coupling and their analytical expressions are derived. An experimental circuit is fabricated and measured. The circuit area is only 23.2% of that of a conventional rat-race coupler. Measured magnitude and phase responses of the four-port S-parameters show good agreement with simulation data.
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    Compact Filtering Branch-Line Coupler With Source-Load Coupling
    (2016)
    Lin, Tsu-Wei
    ;
    Wu, Jen-Yi
    ;
    Kuo, Jen-Tsai
    ;
    電信工程研究所
    ;
    Institute of Communications Engineering
    Source-load coupling is inserted to a compact filtering branch-line coupler for generating transmission zeros. Quarter-wavelength stepped-impedance resonators are employed as the resonating elements for circuit miniaturization. All inter-resonator couplings are of inductive type, and the source-load coupling between adjacent feeds is of capacitive type. Proper source-load coupling is extracted for control of attenuation level in stopband. The realized circuit area is only 31.4% of that of a conventional branch-line coupler. Measurement results have good agreement with the simulation data.
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    Miniaturized Dual-Mode Ring Resonator Bandpass Filter with a Wide Passband
    (2014-01-01)
    Lin, Tsu-Wei
    ;
    Kuo, Jen-Tsai
    ;
    Tang, Shao-Chan
    ;
    Chung, Shyh-Jong
    ;
    傳播研究所
    Dual-mode ring resonator filter is designed to have a relatively wide passband with a miniaturized circuit area. The miniaturization is achieved by folding the ring trace to a spiral configuration. The two degenerate modes are split up by an asymmetric inductive perturbation. As a result, the circuit area is only 29% of that of a conventional ring. The strong I/O coupling required by the wide passband property is implemented by adding an impedance transformer for matching the external quality factor (Q(ext)) with the circuit bandwidth. Measured results show good agreement with the simulation.