Structural Design Of Filling Curve UC-EBG Based On Peano LS Algorithm And Its Application In Microstrip Antenna

With the development of mobile communication systems and space electronic technology,the simultaneous development of electronic components of communication terminal equipment will provide new opportunities for the development of new devices.The performance of existing devices will be greatly improved by combining new devices with related devices.Electromagnetic Band Gap(EBG)has two characteristics of surface wave band gap characteristics and in-phase reflection,which can improve the power efficiency and phase characteristics of microwave devices.This thesis introduces the theoretical analysis and simulation methods for the two characteristics of EBG.The principle of the rectangular microstrip patch antenna and the Peano LS algorithm curve are introduced as well.According to the theory of Peano LS algorithm curve,the curve belongs to a fractal structure with self-similarity and spatial filling.Based on the third iteration curve of Peano LS algorithm,two different UC-EBG structures,SP-UC-EBG and PP-UC-EBG,are designed.Then the complementary structure of these two UC-EBGs and the third iteration curve based on Peano LS algorithm are applied to the rectangular microstrip antenna array.Finally,the microstrip slot antenna is designed and the SP-UC-EBG structure is applied to this Microstrip slot antenna.Firstly,we design two UC-EBG structures based on the Peano LS algorithm filling curve,SP-UC-EBG and PP-UC-EBG.Various electromagnetic band gaps are obtained by changing the dimensions of the two EBG structures.In this paper,we select FR4 as dielectric board,five EBG unit structures are periodically arranged.For convenience,the structure of SP-UC-EBG array is referred to as S_FR_EBG,and the structure of PP-UC-EBG array is called P_FR_EBG.After the S_FR_EBG simulation,the band gap are 2-29.74 GHz and 31.54-70 GHz can be obtained.After the P_FR_EBG simulation,the forbidden band gap are 2-36.72 GHz and 37.49-70 GHz.Physical processing and testing of two EBGs arranged in a periodic manner.The test results are basically consistent with the simulation results.Secondly,we studied the third iterative fractal curve of self-UC-EBG structure,P-UC-EBG complementary structure andPP-UC-EBG complementary structure loaded into the rectangular microstrip antenna array based on Peano LS algorithm.The rectangular microstrip antenna array have identical size and composition except the EBG structure.By optimizing these three EBG structures,the coupling degree of the rectangular microstrip antenna array is reduced by 6.17 dB,7.21 dB,9.86 dB,respectively,compared with the rectangular microstrip antenna without the EBG structure.Finally,we investigated microstrip slot antenna about the effect of patch between the slots on the performance of the antenna.The results show that the antenna can obtain a low-frequency operating bandwidth when all the slots are connected.The optimized simulation allows the microstrip slot antenna to operate normally at the frequency of 0.74-3.15 GHz.While loading the SP-UC-EBG structure into the microstrip slot antenna and adjusting the position and number of SP-UC-EBG loading,the antenna can be optimized at 4.56-6.48 GHz.The above results provide guidance for the design and analysis of fractal EBG structures,and provide ideas for the combination of fractal EBG structures and antennas.