Browsing by Author "Hsieh, Ping-Yueh"

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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.
Compact Stepped-Impedance Resonator Bandpass Filter with Two Wide Spread Passbands
(2008)
Chiou, Yi-Chyun
;
Hsieh, Ping-Yueh
;
Kuo, Jen-Tsai
;
電信工程研究所
;
Institute of Communications Engineering
This paper presents the design method for a compact dual-band bandpass filter with a large ratio of center frequencies. Emphasis is placed on circuit synthesis for simultaneously matching the in-band responses at the two designated passbands. In an interdigital configuration, a 0.9/5.8 GHz bandpass filter is designed and fabricated. It is believed that this is the filter has the largest ratio of the center frequencies in comparison with those in open literature. The measured responses show good agreement with the simulation results.