| With the rapid evolution and booming development of millimeter-wave communication,lens antenna and transmitarray antenna become the hotspot of research in recent years due to their excellent performance.Both the lens and transmitarray antennas can transform the most of the spherical wave into the planar wave,featuring advantages of wideband,low cost,multiple beams,high gain,etc.They are widely used in millimeter-wave mobile communication,satellite communication,radar detection,telemetry and remote sensing,and some other fields.In this thesis,a series of researches on millimeter-wave lens antenna and transmitarray antennas have been carried out.The specific work is summarized as follows:1.A PCB-stacked air-filled multi-beam Luneburg lens antenna is proposed.Compared with the conventional all-metal parallel-plate waveguide Luneburg lens antenna which is fabricated by machining,the proposed antenna is obtained with stacked PCB,realizing low-cost substitution.The gain is enhanced by flaring the radiation aperture.Besides,the proposed antenna can realize multi-beam scanning,featuring the characteristic of a wide scanning range.2.A triple-layer multi-beam Luneburg lens antenna based on dielectric drilling is proposed.Based on the effective medium theory,a lightweight triple-layer structure is realized by drilling holes in two splicing dielectric substrates of different dielectric constants.The triple-layer Luneburg lens antenna is an improved design based on a single-layer structure.The triple-layer Luneburg lens suppresses the side lobe level in Hplane remarkably,hence it enhances the performance of the antenna.3.A high-gain high-efficiency double-layer transmitarray antenna using miniaturized elements is proposed.At first,a miniaturized double-layer transmitarray element based on the Jerusalem cross is developed,and its transmission performance is analyzed.Then a double-layer transmitarray antenna is developed based on the principle of phase compensation.Compared with conventional multi-layer transmitarray antenna,the proposed antenna has superiorities of dual-polarization,low profile,simple structure,low cost,and high aperture efficiency.4.A wideband high-gain metal transmitarray using quadruple-ridged waveguide elements is proposed.The phase shift principle of the quadruple-ridged waveguide as a transmission element is studied,and the transmission performance is analyzed.Then an all-metal transmitarray antenna is designed based on the principle of phase compensation,and the 2D beam scanning ability is validated.The proposed antenna features wideband,high gain,dual-polarization,and 2D beam scanning while maintaining high aperture efficiency. |
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