Browsing by Author "Tsai, Cheng-Hsiu"

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Comments on "A Symmetrical Four-Port Microstrip Coupler for Crossover Application"
(2009-07-01)
Chiou, Yi-Chyun
;
Tsai, Cheng-Hsiu
;
Kuo, Jen-Tsai
;
電信工程研究所
;
Institute of Communications Engineering
Miniaturization Design for Planar Hybrid Ring Couplers
(2008)
Chiou, Yi-Chyun
;
Tsai, Cheng-Hsiu
;
Wu, Juo-Shiuan
;
Kuo, Jen-Tsai
;
電信工程研究所
Miniaturization of a microstrip rat race coupler is implemented by three approaches. First, a new rat race hybrid design is devised for circuit miniaturization based on the periodic stepped-impedance ring structure. The circuit has a normalized area of 21.5%. In the second approach, miniaturization is carried out by incorporating a broadside-coupled structure and stepped-impedance sections into the design. The former is used to replace the 3 lambda/4-section and the latter is to substitute each lambda/4-section in the regular 6 lambda/4 circuits. As a result, one of the circuits occupies only 18% of the area of a traditional rat race. Finally, a general synthesis is performed to design reduced-length rat race rings. Incorporating the stepped-impedance configuration, the normalized circuit area is 13.12% of a 6 lambda/4-ring. All the designs are validated by comparing measured four-port parameters with the simulated results.