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Design of new hybrid-ring, directional coupler using λ/8 or λ/6 sections

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2 Author(s)
Dong Il Kim ; Dept. of Electron. & Commun. Eng., Korea Maritime Univ., Pusan, South Korea ; Gyu-Sik Yang

The authors propose a design method for 1.25 λ-ring and 7λ/6-ring 3-dB directional couplers using λ/8 and λ/6 sections, respectively. In addition, the frequency characteristics of the couplings together with the isolations, the return losses, and the phase differences between the output ports are calculated. The method was experimentally verified for a microstrip network, proving its validity for a microwave component with the basic λ/8 and λ/6 sections proposed

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:39 ,  Issue: 10 )