Browsing by Author "Wu, Juo-Shiuan"

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Miniaturization Design for Planar Hybrid Ring Couplers
(2008)
Chiou, Yi-Chyun
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Tsai, Cheng-Hsiu
;
Wu, Juo-Shiuan
;
Kuo, Jen-Tsai
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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.
Miniaturized 7 lambda/6 Rat Race Coupler with Microstrip-to-CPW Broadside-Coupled Structure and Stepped-Impedance Sections
(2008)
Chiou, Yi-Chyun
;
Wu, Juo-Shiuan
;
Kuo, Jen-Tsai
;
電信工程研究所
;
Institute of Communications Engineering
Miniaturization of the rat race coupler is implemented by incorporating a microstrip-to-coplanar waveguide (CPW) broadside-coupled structure and stepped-impedance line sections into the design. The former is used to replace the 4 lambda/6-section and the latter is to substitute the lambda/6-sections in a 7 lambda/6-rat race. The circuit occupies only 8.9% of the area of a traditional rat race of 3 lambda/2 circumference. It is believed that it has the best size reduction in comparison with those in open literature. Measurement results are shown to validate the design and theoretical prediction.
Miniaturized rat race coupler with microstrip-to-CPW broadside-coupled structure and stepped-impedance sections
(2007)
Kuo, Jen-Tsai
;
Chiou, Yi-Chyun
;
Wu, Juo-Shiuan
;
電信工程研究所
;
Institute of Communications Engineering
Miniaturization of microstrip rat race coupler is implemented by incorporating a broadside-coupled structure and stepped-impedance line sections into the design. The former is used to replace the 3 lambda/4-section and the latter is to substitute the lambda/4-line in the conventional circuit. No lumped-element is required in the circuit. One of the experimental circuits occupies only 18.3% of the area of a traditional 6 lambda/4-rat race. It is believed that it has the best size reduction in comparison with those in open literature. In addition to a wideband characteristic, total inband power loss is better than 3.2%. Measurement results are shown to validate the design and theoretical prediction.
Miniaturized rat race coupler with suppression of spurious passband
(2007-01-01)
Kuo, Jen-Tsai
;
Wu, Juo-Shiuan
;
Chiou, Yi-Chyun
;
電信工程研究所
;
Institute of Communications Engineering
A new hybrid ring coupler design is devised for circuit miniaturization based on the periodic stepped-impedance ring resonator structure. The circuit has an area of 21.5 % of a conventional rat race coupler and no passband up to the sixth harmonic of the design frequency. The designs are validated by comparing measured four-port parameters with the simulated results.