This paper proposes a low-profile and highly efficient endfire radiatingtravelling-wave antenna based on spoof surface plasmon polaritons (SSPPs)transmission line. The aperture is approximately$0.32\lambda_0\times0.01\lambda_0$ where $\lambda_0$ is the space wavelength atthe operational frequency 8 GHz. This antenna provides an endfire radiationbeam within 7.5-8.5 GHz. The maximum gain and total efficiency reaches 9.2 dBiand $96\%$, respectively. In addition to the endfire operation, it alsoprovides a beam scanning functionality within 9-12 GHz. Measurement results arefinally given to validate the proposed SSPPs antenna.
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