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Spoof planar plasmonic waveguides (SPPWs) are a new kind of low-loss surface-wave transmission line. In this letter, a two-dimensional (2-D) antenna array is excited by a one-dimensional (1-D) SPPW in a simple way, and the achievable array size is determined by the mode size of the SPPW. The proposed ${4} \times {4}$ patch array features an average gain of 19.6 dBi in the operating frequency band...
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