Research On Transceiver Decoupling Structure For Microstrip Patch Antennas

For a long time,as an important topic of antenna research,the decoupling between antenna arrays has attracted extensive attention in academia.The influence of isolation between compact antennas on the performance of wireless communication systems cannot be ignored,especially for systems that transmit and receive at the same frequency.The mutual coupling effect is actually a strong interference,and special technical measures need to be taken at the receiving end to eliminate this influence.For many reasons,it is of great significance and practical value to research and explore decoupling between antennas.In this paper,the principle of decoupling of antennas is studied.The decoupling between antennas is studied deeply by using HFSS,a three-dimensional simulation software.The main work and research results are as follows:(1)A decoupling structure based on the field cancellation method is designed.The binary microstrip patch antenna array is taken as an example.The HFSS simulation results show that the decoupling bandwidth of 30 dB can reach 33 MHz with 5.8GHz as the center frequency.Internal isolation can reach 49.5dB.Finally,the simulation and measured data were compared and it was confirmed that the method does have a good decoupling effect.(2)A decoupling structure based on the field cancellation method is designed.A multi-level meander line resonance decoupling structure is added between two antennas to realize the indirect coupling field.Taking the binary microstrip antenna array as an example,the HFSS simulation results show that with 5.8GHz as the center frequency,the decoupling bandwidth of 30 dB can reach 38 MHz,the isolation within the bandwidth can reach 43 dB,and the working mechanism of the decoupling structure is verified.(3)A band-stop filter decoupling structure is designed.The binary microstrip patch antenna array is taken as an example.The simulation results show that the band-stop filter structure can achieve a 10 dB matching bandwidth of 162.8MHz at 5.8GHz,and the bandwidth is isolated.The degrees are greater than 22 dB,and the maximum isolation is 37.5dB at 5.8GHz.Meanwhile,simulations shows the introduction of the band-stop decoupling structure does not affect the original pattern of the antenna array.Another idea is proposed for the band-stop filter structure.The simulation results show that the idea(similar to the Spur line)does not have decoupling ability,and it is proposed that the band-stop filter structure should be used in the form of DGS.