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A New Plasmonic Broadband Branch-Line Coupler for Nanoscale Wireless Links

In this letter, we investigate the performance of a plasmonic conductor-backed coplanar waveguide as a transmission line. We illustrate the characteristics of modes supported by this structure and present its analytical model of the characteristic impedance, which is further used to design broadband branch-line coupler for nano scale wireless links. The optimized design exhibits the required performance for a wide bandwidth of about 40 THz where the insertion loss is in the range of 5±1 dB.