The Design Of Millimeter Wave Filter Based On SIW Loaded With Meta Surface For 5G Communication Applications

For the upcoming 5G communication system,the mobile data flow will be increasing,and can not rely on the evolution of wireless transmission and networking technology in the various low frequency segments,and more wireless spectrum resources are needed.Millimeter wave technology can achieve ultra high speed wireless data transmission by increasing spectrum bandwidth,thus becoming one of the key points in 5G communication technology.The design of millimeter wave chip must overcome the two difficulties of power consumption and electromagnetic design.Substrate Integrated Waveguide(SIW)technology is a new guided wave structure which can be integrated into dielectric substrate with low insertion loss,low radiation,high power capacity and so on.It can effectively realize passive and active integration,and miniaturize microwave millimeter wave system.Based on the development stage of 5G communication,a new supermaterial structure unit,staircase impedance face type E type defect ground structure(Stepped-Impedance Back-to-back E-shaped DGS,SIBE-DGS),has been proposed on the basis of the study of supermaterial structure unit loading SIW.It has the advantages of high external restraining system.Based on this DGS,three filters are designed respectively,which are 28 G bandpass filter,38 G bandpass filter and double pass millimeter wave filter,which have the advantages of low insertion loss,high frequency selectivity,high resistance band suppression and so on.HFSS EDA software is used to simulate the performance of the 28 GHz bandpass filter of QSIFE-DGS loading SIW,and the performance parameters of the band insertion loss less than 2dB and the echo loss greater than 15 dB,the stopband in 31 GHz to 50 GHz are above 25 dB,and the inhibition degree of the internal resistance band in the frequency doubling is kept above the 20 dB.The performance of the wave device is that the insertion loss in the band is within 4dB,the return loss is better than 14 dB,and the external 1GHz is under the system to reach 30 dB,and the band loss in the frequency doubling is kept above 15 dB.The simulation SIFE-DGS loads SIW,the central frequency is 28 GHz,38GHz,and the 25-30 GHz passband is obtained.Two transmission poles are produced inside,and two transmission zeros are generated in 30-37 GHz,and a transmission pole is generated in 37-40 GHz,and the performance parameters of 20 dB are reached at 40-50 GHz with external suppression.28G-QSIFE-DGS loaded SIW bandpass filter,38G-DSIFE-DGS loaded SIW bandpass filter,28,38G-SIFE-DGS loaded SIW dual band filter were fabricated.The insertion loss of the 28 GHz band pass filter in the 26-31 GHz frequency range is less than 2.4dB and the transmission loss is more than 40 dB in the 32-40 GHz frequency band.The insertion loss of the 38 GHz band pass filter is less than 4dB in the 37.5-40 GHz frequency range,and the insertion loss of the dual band filter is smaller in the 25-30 GHz band and 38-39 GHz.At 2 dB,the transmission loss in the 32-37 GHz band is greater than 15 dB,which is basically consistent with the theoretical simulation results.It proves the feasibility of the new structure proposed in this paper.And these three filters can be easily integrated into Miniaturized Microwave Circuits,with good design flexibility and frequency selectivity,which have practical significance for the development of 5G communication applications.