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

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 0.32λ
₀
× 0.01λ
₀
, where λ
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.