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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Chiou, Yi-ChyunSubject: search.filters.subject.dual-band

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Now showing 1 - 4 of 4
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    New Miniaturized Dual-Band Rat-Race Coupler With Microwave C-Sections
    (2009)
    Chiou, Yi-Chyun
    ;
    Kuo, Jen-Tsai
    ;
    Chan, Chi-Hung
    ;
    電信工程研究所
    ;
    Institute of Communications Engineering
    Based on microwave C-sections, rat-race coupler is designed to have a dual-band characteristic and a miniaturized area. The C-section together with two transmission line sections attached to both of its ends is synthesized to realize a phase change of 90 degrees at the first frequency, and 270 degrees at the second passband. The equivalence is established by the transmission line theory, and transcendental equations are derived to determine its structure parameters. Two circuits are realized in this presentation; one is designed at 2.45/5.2 GHz and the other at 2.45/5.8 GHz. The latter circuit occupies only 31% of the area of a conventional hybrid ring at the first band. It is believed that this circuit has the best size reduction for microstrip dual-band rat-race couplers in open literature. The measured results show good agreement with simulation responses.
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    Compact Hairpin Resonator Bandpass Filters with Dual-Band Response and Wide Upper Stopband
    (2009)
    Hsieh, Ping-Yueh
    ;
    Chiou, Yi-Chyun
    ;
    Kuo, Jen-Tsai
    ;
    Lok, U. Hou
    ;
    傳播研究所
    Compact bandpass filters are devised with a dual-passband response and a wide upper stopband based on hairpin resonators with three shunt open stubs; one is tapped at its center and the other two are allocated on both sides symmetrically. By adjusting the stub lengths, all resonators are designed to have two identical leading resonant frequencies but different higher-order ones. To enhance the rejection level and extend the upper stopband, the transmission zeros created by the tap structures and the coupled-line stages are used to eliminate the remaining leading unwanted peaks. In addition, a method for reducing the radiation loss in upper stopband is investigated. Measured results show that the fifth-order filter has a rejection level below 30 dB can be extended to six times the first frequency. Good agreement between measured and simulation is obtained.
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    Dual-Band Rat-Race Coupler With Arbitrary Power Divisions Using Microwave C-Sections
    (2009)
    Wu, Cho-Yu
    ;
    Chiou, Yi-Chyun
    ;
    Kuo, Jen-Tsai
    ;
    傳播研究所
    ;
    Institute of Communication Studies
    Rat-race coupler is designed to have dual-band operation, a miniaturized area, and arbitrary power division using microwave C-sections. With a C-section and two transmission line sections attached to both of its ends, an elementary two-port is designed to play the role of a quarter-wave section in a conventional rat-race. It is designed to possess phase changes of 90 degrees and 270 degrees at the first and second frequencies, respectively. Transcendental equations are derived for calculating its structure parameters. Two circuits operating at 2.45/5.8 GHz with various output power ratios are fabricated and measured. Both couplers have only 31% area of conventional rat-race at the first band. It is believed that these circuits have the best size reduction for microstrip dual-band rat-race with arbitrary power division in open literature. Measured results agree well with their simulation counterparts.
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    New Miniaturized Dual-Mode Dual-Band Ring Resonator Bandpass Filter With Microwave C-Sections
    (2010-02-01)
    Chiou, Yi-Chyun
    ;
    Wu, Cho-Yu
    ;
    Kuo, Jen-Tsai
    ;
    傳播研究所
    ;
    Institute of Communication Studies
    A new miniaturized dual-mode dual-band ring resonator bandpass filter is implemented by a cascade of several microwave C-sections. Each C-section is used to substitute a transmission line section of designated electrical length. Through proper design of input/output coupling configuration, two transmission zeros can be created on both sides of each passband. Two circuits with four and six microwave C-sections are fabricated for confirmation. They occupy less than 30% of the area of a traditional ring resonator filter. Measured responses agree very well with the simulation.