| In order to compensate for the transmission loss of 5G wireless communication systems in the millimeter wave band,the design requirements for high gain antennas are becoming increasingly stringent.In recent years,planar lens antennas based on phase correction to achieve focusing effects have received increasing attention.Lens antenna converts spherical wave from point source into plane wave,which has the advantages of high gain,low sidelobe,simple feeding,etc.So,it has unique advantages in near millimeter wave and submillimeter wave bands.This thesis mainly researches and demonstrates a design method of planar lens for antenna array gain enhancement.The main work is as follows:1.Firstly,the basic principle of the plane lens antenna is introduced,and the calculation method of the phase distribution of the double-layer lens layer in this paper is proposed.Different from the traditional plane lens design,the plane lens layer proposed in this paper is a double-layer plane lens.For the multi radiation source scene,the gain of the antenna array is significantly improved.2.Based on the idea of phase compensation,the method of improving the antenna array gain with planar lens structure is explored.Transform the electromagnetic wave emitted by the dual point source into plane wave after passing through two layers of lenses.The design goal of the first layer of lens is to make the composite wave of the electromagnetic wave emitted by the point source A and B the same phase as the spherical wave emitted by the virtual point source C.The design goal of the second layer lens is to make the spherical wave emitted by the virtual point source C become a plane wave after passing through the second layer lens.Finally,under the joint action of the two lenses,the electromagnetic waves emitted by point source A and B are successfully converted into plane wave.This case verifies the theoretical feasibility of using two-layer lenses for phase compensation of multiple radiation source antennas.3.In response to the narrow accuracy and applicability of traditional planar lens design methods,this thesis introduces the physically inspired neural network method(PINN)to solve the problem.The study first introduced the basic idea of the PINN algorithm,followed by a detailed introduction of the solving and training optimization process of PINN.Finally,a detailed process for designing planar lenses based on PINN was provided,and the results of the example meet expectations,verifying the accuracy and high efficiency of PINN in planar lens design. |
