A Small-Aperture and High-Performance Endfire Holographic Antenna Based on Spoof Surface Plasmon Polaritons
Sajjad Zohrevand, Mohammad Amin Chaychi Zadeh, Ehsan Farokhipour, Daniel Erni, Nader Komjani
Abstract
In this paper, a spoof surface plasmon polariton (SSPP) antenna with endfire radiation is inspired by the holographic technique. In contrast to the previous studies with optimization-based structures or using SSPP odd modes, we propose a simple method to design an endfire SSPP antenna based on the holographic principle that can maintain the stability of the endfire radiation over 23% of the impedance bandwidth. The proposed method includes twice modulating the structure with a 180° phase difference. This method eliminates the null in the endfire radiation pattern created by the conventional sinusoidally-modulated reactance surface (SMRS) technique. The proposed SSPP holographic antenna presents a stable endfire radiation pattern within the frequency range of 8-10 GHz. The realized gain and radiation efficiency at the design frequency of 9 GHz are 13.1 dBi and 95%, respectively. An antenna prototype is fabricated and measured in the anechoic chamber. The full wave simulation results of the CST software agree well with measured ones. This miniaturized endfire SSPP holographic antenna can be a potential candidate for wireless communication applications and integrated circuits.