Study On Antennas Based On Spoof Surface Plasmon Polaritons

Surface plasmon polaritons(SPPs)are a special electromagnetic wave in far infrared band propagating along the surface of metals and media.Spoof surface plasmon polaritons(SSPPs)are the expansion of SPPs in the microwave and terahertz wave band.It is an electromagnetic mode transmitted on the metal surface and is constrained by periodic grooves or holes.Recently,due to its strong field confinement and slow-wave feature,SSPPs have inspired an intensive interest in antenna engineering.The application of SSPPs in antenna field is studied in this paper.The transmission characteristics of the odd and even mode of SSPPs are discussed,several low profile and broadband antennas are designed for wireless communication and remote sensing.The main contents of this study are as follows:1.According to the odd mode and even mode theory of SSPPs,a pattern reconfigurable antenna is proposed.A reconfigurable feed circuit controlled by three PIN diodes is introduced.By loading forward or reverse bias voltage,either odd or even mode can be excited on the SSPPs transmission line.It is demonstrated that the proposed antenna can provide an endfire radiation beam in the odd mode or broadside radiation beam in the even mode.2.Aiming at the narrow bandwidth of the existing SSPPs endfire antenna,this article present a wide-band endfire antenna based on the SSPPs.The proposed antenna is fed by asymmetric structure thus the odd SSPPs mode is excited,which results in the endfire radiation within a broadband.