Investigation On Millimeter And Sub-millimeter Planar Lens Antenna And Planar Broadband Bandwidth Antenna

As the development of the 5th generation of mobile communication(5 G),the frequency band of millimeter wave and sub-millimeter wave will become the irreplaceable research hotspot.Thus,the 5G antennas with high performance will be important and attract increasing attentions.Based on these backgrounds,the planar millimeter and sub-millimeter lens as well as the broadband bandwidth antennas are investigated in this paper.The main researches of the dissertation are following:1)The novel dual-polarization feed,or an antenna with substrate integrated waveguide(SIW)back-cavity,was proposed and analyzed.This antenna had a good isolation and a high polarization discrimination,it was also easy to be integrated with the RF circuits.Then,four pairs of patches,which were printed on the same positions of the both top and bottom surfaces of the substrate were introduced.The patches were integrated with the dual-polarization antenna designed previously,improving the gain of the antenna and making radiation patterns of E-plane and H-plane more consistent.Meanwhile,the bandwidth of the antenna was also be increased.2)A planar lens based on the broadband bandwidth phase shift resonant cells was proposed and investigated.By the cell and improved method of calculating compensated phase of each compound cell,the efficiency and the gain of the lens was increased.3)Based on the common 4-hole cell,the improved 5-hole cell was proposed.Compared with the pervious 4-hole-cell,the 5-hole-cell proposed here could not only increase the amount of the samples of the cells,reducing the quantization error remarkably,but also increase the maximum phase shift value of the cells.By the improved cell,a planar lens with dual-polarization,high gain and high integration was realized.4)A packaged ultra-broadband terminal antenna was proposed and investigated.This antenna had a simple structure,a low pattern ripple,a ultra-broadband bandwidth and a high isolation between the antenna itself and the RF circuit nearby.5)A 17-element SIW slot antenna array with loading slots were analyzed and designed.By adding the loading slots,the bandwidth of the SIW slot array antenna was increased,the gain of the antenna versus the operation frequency was also made to be more stable.6)Based on the MEMS craft,the 1 by 4 and 4 by 4 sub-millimeter waveguide antenna arrays were designed.Two methods,including improving the amount of element and optimizing the coupling amount of each element were discussed to improve the gain of the antenna array.Then,the antenna array was integrated with a frequency selective surface in order to improve the gain.The relative research results had been published or accepted by IEEE Transactions on Antenna and Propagation and Microwave and Optical Letter as well as the IEEE European Conference on Antennas ans Propagation,two patent had also been authorized or filed.