Browsing by Author "Wu, Cho-Yu"

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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.
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.