Miniaturization Design Of MEMS Microstrip Antenna Based On Metamaterials

The requirements of miniaturizing and integrating various components become more and more high in the area of intelligent transformation for conventional ammunition,navigation antenna is one of the key components.Microstrip antenna has characteristics such as low profile,simple manufacturing,easy to conformal,low cost and et al.It is widely used in the field of intelligent ammunition.Since the central operating frequency is 1.561 GHz for Beidou navigation antenna,the traditional microstrip antenna cannot meet the needs of ammunition transformation due to its large size.In this context,a MEMS microstrip antenna based on metamaterials is designed,which size is smaller than 35 × 35mm2,to satisfy the miniaturization of the antenna.This thesis is composed of three parts,namely,theoretical derivation,simulation analysis and experimental test.In the theoretical part,how to design the microstrip antenna and how to extract the constitutive parameters of metamaterial medium are introduced.The simulation analysis is mainly based on HFSS,a numerical simulation software.First,the difference between the traditional microstrip and the MEMS microstrip antenna is analyzed.The numerical simulation of the metamaterial medium is carried out to study equivalent dielectric constant,permeability,refractive index and impedance parameters via the waveguide method.The Beidou metamaterial MEMS microstrip antenna is designed using the metamaterial as its dielectric substrate.The antenna size is only 61.5% of the traditional MEMS microstrip antenna.Combined with micro-electro-mechanical(Micro-Electro-Mechanical System,MEMS)manufacturing process technology,the manufacturing flowchart is determined according to the designed microstrip antenna based on metamaterial.Further,a metamaterial antenna using Rogers RT/duroid 5880 are processed.The return loss S11 of the antenna is measured by using the vector network analyzer.The test results show that the center frequency of the microstrip antenna is 1.561 GHz,the working bandwidth is 15 MHz,and the VSWR is less than 1.5 in the bandwidth range.The direction diagram for the antenna indicates that maximum gain is in the central working frequency and the radiation direction is omnidirectional.Finally,the design of the metamaterial MEMS microstrip antenna radiation patch is 18.1 × 16.3mm2,it achieves the requirements of miniaturization,the simulation results show that the electrical performance indicators to navigation antenna design requirements,experimental tests show that the design method described in this paper is feasible.