Endfire Antenna Based on Spoof Surface Plasmon Polaritons

A novel endfire antenna based on spoof surface plasmon polaritons (SSPPs) transmission line is proposed in this paper. The main radiator of the antenna is excited by the SSPP transmission line. Due to the high transmission performance of the SSPP transmission line, which is realized by etching a series of periodic corrugated grooves on the microstrip. This antenna consists of two layers: On the upper layer, radiation elements are made up of periodic units and directors, the upper and bottom layers are symmetrically. The aperture is approximately 3λ0 × 0.85λ0, where λ0 is the space wavelength at the operational frequency 8 GHz. The antenna is designed to operate in the C-band and X-band, with an impedance bandwidth of 50% (6-10 GHz). The impedance bandwidth and total efficiency reach 50% and 95%, respectively. It is implemented on a single layer dielectric substrate for the endfire antenna. Due to the good performance, it has potential applications in radar and wireless communication systems.