New Left-Handed Metamaterial Unit And Its Application In Microstrip Antenna Research

Left-Handed metamaterial is a new type of artificial material,it has characteristics that are quite different from traditional right-hand materials.Based on these characteristics,scientists have found that left-handed metamaterials have great application prospects in the fields of antennas,radar,and optics and so on.This paper mainly studies the left-handed metamaterial structure and its application in antennas.The research contents mainly include:1.This paper studied the development history of left-handed metamaterial and the current research status,and then introduced the working principle of left-handed metamaterials and the characteristics such as negative refraction effect,inverse Doppler Effect,and inverse Cherenkov by formula derivation.Then the paper focuses on the left-handed metamaterial structure formed by using a periodic metal-opening resonant ring and a periodic metal rod array.2.In this paper,a ring-shaped left-handed metamaterial structure is designed,and the equivalent parameters of the structure are obtained by simulation.The structure has negative dielectric constant and negative magnetic permeability characteristics in the frequency band of 3.36GHz-3.69 GHz,and the frequency band of negative refraction is 3.36GHz-3.97 GHz,the peak negative refractive index is-5.58 in the frequency point of 3.36 GHz.In order to add a new solution to the miniaturization of the antenna,the paper uses this structure to design a monopole microstrip antenna loaded with left-handed metamaterials.Compared with the original antenna,the resonant frequency of the optimized antenna is 3.75 GHz,reduced to 3.34 GHz and produced a new resonant frequency band at the lower 2.3 GHz frequency.Then the paper studies the relationship between the structural parameters of the left-handed metamaterial structure and the antenna,and uses the equivalent circuit theory to analyze the relationship between the structure and the antenna.The analysis results correspond to the simulation results.Next,the paper optimized the single-sided left-handed metamaterial into a double-sided left-handed metamaterial structure,and optimized the antenna using the double-sided structure.Compared with the antenna loaded with the single-sided structure,the antenna loaded with the doublesided structure is further reduced in resonance frequency.At the end of the paper,the antenna is produced and tested.The test results are consistent with the simulation results.However,due to manufacturing accuracy and other issues,the test results and simulation results are subtle.3.Then,this paper designs a cross-bearing single-sided left-handed metamaterial structure,and uses the equivalent circuit theory analyzed the relationship between the characteristic parameters of the structure and the physical parameters of the structure.In order to verify the conjecture,the paper uses simulation software to simulate the S parameters of the structure,and then extracted the equivalent electromagnetic parameters of the structure,which proves that the structure has a negative dielectric constant and a negative magnetic permeability characteristic between the 7.62GHz-8.14 GHz and 7.37GHz-8.91 GHz frequency band.And then changed the corresponding parameters to obtain the resonance frequency curve of the structure,which is consistent with the theoretical derivation result and proves the correctness of the result.