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This letter proposes a low-profile and highly efficient endfire radiating traveling-wave antenna based on spoof surface plasmon polaritons (SSPPs) transmission line. The aperture is approximately 0.32&#x03BB;0 &#x00D7; 0.01&#x03BB;0, where &#x03BB;0 is the space wavelength at the operational frequency 8 GHz. This antenna generates near-endfire radiation beams within 7.5-8.5 GHz. The maximum gain and total efficiency reach 9.2 dBi and 96%, respectively. Measurement results are finally given to validate the proposed SSPPs antenna.

Low-Profile Spoof Surface Plasmon Polaritons Traveling-Wave Antenna for Near-Endfire Radiation