数字编码超材料相频响应扩展及验证

doi:10.19665/j.issn1001-2400.2022.05.011

Abstract

Abstract:

Digital coded metamaterials have an excellent electromagnetic control ability,and can be used to realize low-cost digital arrays by controlling the phase in the form of switches to modulate the spatial radiation field.However,the dispersion effect of digital coded metamaterials in practical applications makes the coherent bandwidth of digital quantization phase modulation too narrow.Taking 1 bit coded metamaterial unit as an example,the phase bandwidth is proposed to characterize the phase modulation consistency.According to the structural characteristics of digital coded metamaterials and the transmission line theory,a transmission line structure for a digital coded metamaterial unit is given.By introducing a non-uniform transmission line and adding a multi-branch transmission line,the tuning range of phase-frequency response and amplitude-frequency response of a digital coded metamaterial unit is extended,and the design standard can be proposed according to the bandwidth requirements under different phase modulation consistencies.The electromagnetic simulation software CST is used to optimize the structure parameters of the non-uniform transmission line and the multi-branch transmission line.Simulation results show that the -phase bandwidth is broadened under different unit -phase differences.Finally,under the two typical application backgrounds of array beamforming and random radiation field generation,the effectiveness of the proposed method in broadband applications is proved by the two indicators of beam directivity and pattern correlation of digital coded metamaterials.

Key words: digital coded metamaterials, δ-phase bandwidth, nonuniform transmission line, multi-branch transmission lines

CLC Number:

TN82

WANG Guoqiang,MA Hui,GAO Sizhe. Phase-frequency response expansion and verification of digital coded metamaterials[J].Journal of Xidian University, 2022, 49(5): 92-99.

Figures/Tables 19

References 16

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参数	数值
采样率/GHz	2
脉冲次数	100
信号带宽/GHz	1
超材料阵元数	100
阵元间隔/m	0.015
网格数	400
网格划分范围/m	-90~90 -90~90
网格大小/(m×m)	9×9
信噪比	30

Phase-frequency response expansion and verification of digital coded metamaterials

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