Design Of E-Band High Gain Metallic Cavity Array Antenna

With the increasing demand for high-speed wireless transmission,new communication systems need to have wider bandwidth and higher transmission rates.The E band has low water vapor and atmospheric attenuation near the 80 GHz,71–76 GHz and 81–86 GHz have become the millimeter-wave outdoor point-to-point backhaul application frequency band.In order to meet the requirements of point-to-point communication system for high-gain,lowprofile,narrow beam and wide-band antenna,this paper carried out related research on E-band high-gain planar array antenna based on the radiation structure of metallic cavity.The specific work is as follows:1.Based on the demand of E-band point-to-point communication for high-gain,lowprofile and wide-band array antennas,this paper analyzed the research status of planar array antennas,such as microstrip antenna,substrate integrated cavity antenna,waveguide slot antenna and metallic cavity antenna,besides,this paper summarized and compared different types of antennas.In addition,the principle of the slit coupling structure of the waveguide is analyzed,and the transmission characteristics of the ridged waveguide are introduced,which provides a theoretical basis for the design of the planar array antenna feed structure.2.A 32×32 linear polarized high gain metallic cavity array antenna in E-band is designed.Firstly,metallic blocks are loaded into the metallic cavity.By analyzing the current distribution on the surface of the metallic block and the electric field distribution on the radiation aperture,a 2×2 high gain metallic cavity subarray antenna based on surface current and equivalent magnetic current radiation is proposed.Then,a 1 to 256 single-layer feed network with ridged waveguide structure is designed,based on the wide transmission bandwidth of the fundamental mode of ridged waveguide.In addition,for the convenience of antenna installation and testing,a vertical transfer structure from WR12 standard waveguide to ridge waveguide is proposed.3.An 8×8 dual polarization high gain metallic cavity array antenna in E-band is proposed.Firstly,based on the radiation principle of the linearly polarized antenna and the symmetry of the subarray antenna,a cross-shaped coupling slot is formed,two layers of feed waveguides fed through the transverse slot and the longitudinal slot respectively,so as to obtain the bipolar subarray antenna.At the same time,a cavity is designed between two layers of feed waveguides to improve the degree of isolation of the two polarization,and a new resonant point is introduced to adjust the impedance bandwidth of the antenna.In addition,an improved double-layer T-type power divider is proposed,which realizes the in-phase feed at the transverse slot of the output port.Combined with the single-layer T-type power divider,two 1to 16 power dividers are designed to form the feed structure with two polarization.