Design Of Novel Broadband Reflectarray Antenna And Novel FSS Radome Based On Metasurface

The metasurface is a two-dimensional surface structure composed of sub-wavelength elements and has the function of controlling electromagnetic wave.It has drawn great attention in many fields due to its advantages of low profile,small size and low cost,especially in the field of microstrip reflectarray antenna.In 5G communication system,antenna is required to have wider bandwidth and the radome with filter characteristics is one of the solutions for better EMC performance.Therefore,this paper will focus on a wideband reflectarray antenna and a novel miniaturized FSS radome design.This work is summarized as follows:1.According to the influence factors of bandwidth,a novel broadband reflectarray antenna using phoenix element based on metasurface is proposed.The simulation method of Waveguide Approach(WGA)with symmetrical boundary is used in the proposed element.Then the element achieves a full phase swing of 360° with a linear phase-shift curve in order to eradicate the phase error for bandwidth enhancement.Finally,using the proposed elements,a 100-element reflectarray antenna is designed and simulated.The results show that the simulated gain at 28 GHz is 19.2 dBi,and-1 dB bandwidth is 30.7%.2.Because the size of element is restricted in high frequency band,a compact FSS radome has been designed based on 2.5-dimensional Jerusalem cross.The proposed element consists of two main parts:the successive segments of the metal traces placed alternately on the two surfaces of the substrate and the vertical vias connecting traces.The transmission curves indicate a significant size reduction and exhibit good angular and polarization stabilities.Furthermore,a general equivalent circuit model is established to provide direct physical insight into the operating principle of this FSS radome.A prototype of the proposed FSS radome has been fabricated and measured,and the results validate this design.