Design Of Microstrip Array Transmitting Antenna Based On Microwave Energy Transfer

With the increasing shortage of fossil energy on the earth,the energy problem has been paid more and more attention.The key technology of energy transmission is one of the key links of energy problem.Microwave wireless energy transmission has broad practical value in the field of energy transmission.In this thesis,the transmitting antenna of microwave wireless energy transmission system is studied.According to the theory of microstrip array antenna and focusing principle,the amplitude excited antenna and the amplitude excited antenna with phase compensation are designed based on the amplitude excited antenna.The flat-topped beam microstrip array antenna is also studied.The main research contents of this paper are as follows:1.Research and design of Chebyshev amplitude focused microstrip array antenna.By controlling the excitation amplitude of the array element as Chebyshev function through microstrip feed network,the far-field pattern of the antenna array is obtained.Through simulation analysis and calculation,the focusing energy distribution effect of the antenna array in the near field at lm is verified.The antenna half-power beam is focused in the area of 25.2cm×25.2cm,accounting for 36%of the calculated area(42cm×42cm plane),and a good focusing energy effect is achieved.The Chebyshev amplitude focused microstrip array antenna with phase compensation is designed according to the near field phase focusing principle.The simulation results show that the antenna half-power beam is focused in the area of 8.4cm×8.4cm at the near field with a focal length of lm,which accounts for 4%of the calculated area(42cm×42cm plane).Array antennas with phase compensation have better focusing effect in a small range.The near-field energy distribution of the two antennas is tested,and the simulation results are in good agreement with the measured results.2.Research and design of Taylor amplitude focused microstrip array antenna.The excitation amplitude Taylor function form is realized by controlling the array element with microstrip feed network,and the far-field pattern of the antenna array is obtained.Through simulation analysis and calculation,the effect of focusing energy distribution in the near field of antenna array at 1m is verified.The half-power of the antenna beam is focused in the 21cm×21cm region,accounting for 25%of the calculated area(42cm×42cm plane).A phase-compensated Taylor amplitude plus phase-compensated focusing microstrip array antenna is designed according to the phase-focused principle.The simulation results show that the half-power beam of the antenna is focused in the 7.56cm×7.56cm region,which accounts for 3.24%of the calculated area(42cm ×42m plane).The machining test of these two antennas is carried out,and the simulation results agree well with the test results.3.A flat-topped beam microstrip array antenna is designed.The influence of the number of array elements on the flat-topped beam shaping effect is studied.The energy density distribution and transmission efficiency of the planar field of the array antenna at lm are calculated.The energy efficiency of the array antenna at lm is 68.5%(1.8m×1.8m plane),and the uniform energy distribution with fluctuation of less than 1dB in the flat top range is realized.