Research On All Dielectric Lens Antenna Based On Artificial Electromagnetic Surface

Lens antenna has the advantages of high gain, low sidelobe, multi beam, wide scanning angle, low loss and easy to design and manufacture, etc, so it is widely used in military and civilian life, such as satellite communications, space high resolution imaging systems, aircraft blind landing and collision avoidance radar.At the beginning of twenty-first Century, the research method of artificial electromagnetic material is widely used on the study of electromagnetic wave control, demonstrating singular electromagnetic phenomena not exists in nature, such as negative refraction, reversed Doppler effect, inverse Cerenkov effect and so on. After further expansion and extension of this concept, people have designed artificial electromagnetic surface which possesses smaller size and lower loss. In this thesis, an artificial electromagnetic surface lens with ultra low profile, high gain, low side lobe and available 3D printer to print is designed. The main innovations of this paper are as follows:Firstly, the concept of electromagnetic wave control for artificial electromagnetic surface is applied in the research of lens, which allows greater flexibility in lens design, this is not up to the traditional design methods.Secondly, the unit cell of artificial electromagnetic surface is chosen as pure medium. The transmission phase of the electromagnetic wave is corrected by the thickness of the dielectric unit, thereby controlling the propagation direction of the electromagnetic wave.Thirdly, the mutual coupling effect and the scanning characteristic of the lens antenna is studied, and the multi focus lens is designed.