Single-Layer High Gain Endfire Antenna Based on Spoof Surface Plasmon Polaritons

Leilei Liu,Xiaoxing Yin,Minghong Chen

doi:10.1109/access.2020.2984153

Abstract

A novel high gain endfire antenna based on the spoof surface plasmon polaritons (SSPP) transmission line (TL) is proposed in this paper. The antenna is designed on a groundless single metal layer inherited the advantages of SSPP. Combined with asymmetric radiation elements of SSPP TL and an elliptical director, this antenna generates endfire radiation beams with 15.75–17.5 GHz. Although the aperture is small, it has obtained a high gain from 10.5 to 12.1 dBi and a high efficiency of 95% overall the operating bandwidth. Measurement results agree well with the simulations. The advantages of single-layer, high gain and low profile make its valuable in wireless communications.

Highlights

Spoof surface plasmon polaritons (SSPP) have inspired an intensive interest in the microwave community, whose characteristics are similar to surface plasmon polaritons (SPP) in the optical frequencies [1]
Since the phase mismatch with the free space, spoof surface plasmon polaritons (SSPP) wave is highly confined to the transmission line
As SSPP transmission line (TL) are slow wave structures in which phase velocity is smaller than the speed of light, traveling wave antennas are well suited to its advantages

Summary

INTRODUCTION

Spoof surface plasmon polaritons (SSPP) have inspired an intensive interest in the microwave community, whose characteristics are similar to surface plasmon polaritons (SPP) in the optical frequencies [1]. Based on the Vivaldi-shaped structure, a wide bandwidth can be obtained [20] These SSPP antennas are designed on double-layer conductors, the single-layer conductors which is the significant advantage of SSPP TLs is not being exploited. It may simplify the fabrication and improve the radiation efficiency due to its groundless single-layer configuration. We propose a novel design of endfire antenna based on a SSPP groundless single-layer configuration. In comparison with previous work, this antenna need only a single metal layer makes it suitable for low-profile. L. Liu et al.: Single-Layer High Gain Endfire Antenna Based on SSPP applications and easy fabrication. It leads to a wide operational frequency and a low profile, which is flushmounted for aircraft, vehicle and wireless communications

DESIGN OF ANTENNA

Findings

CONCLUSION