Frequency Selective Surface Multi-frequency And Broadband Performance Research

Frequency selective surface(FSS)is a metal structure with unique electromagnetic properties formed by the periodic arrangement of one or more metal sheets.It can screen the electromagnetic wave frequency and control the incident,transmission and reflection of the electromagnetic wave.The units constituting FSS are mainly divided into two structures:patch type and aperture type.By changing the structure of FSS,the central resonance point,polarization stability and 3dB bandwidth of FSS are controlled.In this paper,we study and design the rejection and band-pass characteristics of multi-frequency and broadband characteristics of FSS,electromagnetic wave frequency selective surfaces with different angles and polarization mode radiation,for the research of multiple frequency response and broadening the bandwidth technology,design method of stability analysis of multiple perspectives,polarization,and to study the cell structure changes impact on the overall performance of the equivalent circuit diagram is given and the direction of current figure,poor stability of the overall Angle,has greatly improved through the fractal structure.First designed a single band resistance characteristics of FSS,surrounded by four rectangular structure,diamond composite structure for connection between rectangular bar,strip structure between each other to form a closed circuit,the equivalent inductance,the gaps between the diamond structure capable of coupling,the equivalent capacitance,found by HFSS simulation S parameters,the resonant point in 38 GHZ,stopband center frequency speed 12 parameters can reach-35 db,and then based on the single frequency structure loading cross structure,design a dual-band band-stop FSS,the simulation results for the first resonant point in 38 GHZ frequency band,The second band is around 53GHz,and a lot of simulation optimization is done for each size parameter in the figure by using the control variable method,and the influence of parameter changes on the comprehensive transmission performance is analyzed.And then through the medium load method to design a dual-band bandpass characteristics of FSS,the lower structure is a square ring structure,load the four Jerusalem decomposition of the "T" glyph structure,the upper to the cross structure,simulation results show that the resonance frequency of the curve in 10 GHz and 30 GHz,3 db bandwidth were 2.5 GHz and 3.1 GHz,then analyzed his Angle stability and the influence of various parameters on the performance,according to the analysis method of equivalent circuit and resonant coupling principle,the equivalent circuit diagram is given,aiming at the problem of poor stability of FSS Angle,by the fractal method to solve.Finally,based on the square ring structure in the medium layer loaded metal strips,devised a tee with FSS,passband center is located in the first 12 GHz,the second passband center at around 16.5 GHz,the first tee belt is located at 23.7 GHz and 27.9 GHz two poles formed by coupling a wide passband,HFSS simulation found three passband relative bandwidth is 21.6%,27.4%and 23.3%respectively,physical test were 16.6%,24.3%and 20.6%,respectively.It has good polarization stability and Angle stability at 0～45° incidence.Compared with the traditional dual-passband,it has more frequency band choices and has a certain application prospect for enhancing the performance of multi-frequency antenna in satellite communication system.