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A Compact Forward Coupler Using Coupled Composite Right/Left-Handed Transmission Lines

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3 Author(s)
Hirota, A. ; Mitsubishi Electr. Corp., Kamakura, Japan ; Tahara, Y. ; Yoneda, N.

A novel forward coupler using coupled composite right/left-handed (CRLH) transmission lines (TLs) is presented. Forward coupling is enhanced by the CRLH TLs, which have a considerable difference between the effective phase constants in the even and odd modes. A 10-dB forward coupler using the coupled CRLH TLs is simulated and experimentally demonstrated in the S-band. Its coupled-line length is reduced to half that of the conventional right-handed forward coupler with the same coupling.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:57 ,  Issue: 12 )