Research On Sparse Multi-beam Array Antenna

In recent years,people's demand for multi-beam array antennas has increased day by day,and at the same time,its performance requirements have become higher and higher.Therefore,multi-beam antennas are developing in a large-scale direction,which brings about problems such as high cost and high complexity,So it makes sense to sparse the array element.In this paper,weighted method of maximum power transmission efficiency(WMMPTE)is used to achieve the sparseness of the multi-beam array antenna,so that the number of antenna elements is less than the number of beams generated.By introducing the test receiving antenna,forming a wireless power transmission system with the designed antenna,calculating the scattering parameters of this system,using WMMPTE to calculate the required optimal excitation distribution for the designed antenna,and then comparing the contribution according to the optimized excitation distribution The small elements are removed,and the remaining elements form a new array that is the sparse antenna array.The same receiving antenna is introduced again,and the optimal excitation distribution of each element of the sparse antenna array can be obtained by re-optimization.Finally,the corresponding feed network is designed.Realize these incentive distributions.This paper designs two sparse multi-beam array antennas.The specific research content is as follows:Firstly,a 3-element one-dimensional sparse multi-beam array antenna was designed,and the working frequency was 5.8GHz.First,a square microstrip antenna element is used to design a 6-element one-dimensional linear array,four test receiving antennas are introduced to form a wireless power transmission system,and WMMPTE is used to optimize the 6-element antenna array to generate 4 beams with basically the same gain,and then Remove three of the less contributing elements,and use the remaining three elements as a new antenna array.The new array uses WMMPTE optimization again to obtain the optimal excitation distribution of the sparse array,which is finally achieved by designing the feeder network.The simulation and actual measurement results show that 4 beams can be realized by using a 3 element sparse antenna array.Secondly,an 8-element two-dimensional sparse multi-beam array antenna was designed with an operating frequency of 5.8 GHz.First design a 16-element transmit antenna array and9-element receive antenna wireless power transmission system,and then use WMMPTE to optimize to obtain the optimal excitation distribution required to generate 9 beams.According to the excitation distribution,8 of them are found to have relatively small contributions,Remove them and use the remaining 8 elements as a new antenna array.The new array uses WMMPTE optimization again to obtain the optimal excitation distribution of the 8-element sparse array,and finally achieves it by designing the feed network.Simulation and actual measurement results show that using 8-element sparse antenna array can achieve 9 beams.