Design Of E-band Duplex Waveguide Slot Array Antenna

With the advancement of technology and the advent of 5G,the millimeter wave communication system has become the first choice for point-to-point wireless links due to its high transmission data rate and low latency.The E-band(71-76/81-86GHz)has an available bandwidth of up to 10 GHz and low atmospheric attenuation,which has become a hot spot in the current point-to-point wireless backhaul research.Duplexers and high-gain antennas are the core components of high-capacity 5G and B5G/6G mobile communications.The efficient integration of them can greatly reduce the size of the entire communication system.It is of practical significance to design an array antenna with integrated duplexer.This thesis first designs an integrated diplexer-power divider based on the ridge waveguide in the E-band.The diplexer-power divider can be compactly integrated into the feed network of the array antenna,and has the advantages of wide working bandwidth and compact structure.The simulation results show that in the range of 71-76 GHz,the return loss of port 1 is better than 15.8d B;in the range of 81-86 GHz,the return loss of port 2 is better than 14.2d B,and it has good consistency with the output signal of the two output ports,and the isolation between channels is better than 41 d B.Secondly,a 2x2 sub-array waveguide slot antenna is designed,which adopts a 5-layer structure,is designed in layers,and finally is stacked for overall optimization.A transition structure from a single-ridge waveguide to a rectangular waveguide is used to optimize the M5 and M4 layers.Metal ridges are loaded at the center of the wide and narrow sides of the cavity to suppress the interference of higher-order modes of the M3 layer.The M2 and M1 layers use slots of different sizes to form two impedance converters to expand the working bandwidth of the antenna.Finally,this thesis designs a 16x16 integrated duplex waveguide slot array antenna based on the diplexer-power divider,power division feed network and sub-array waveguide slot antenna,with an overall size of 131mm×64mm×7mm.Simulation and actual measurement results show that in the range of 71-76/81-86 GHz,the return loss of port is better than 10 d B,and the isolation of channels is greater than 41 d B.The half-power main lobe width is ?±2°,and the average gain of channel is better than 30 d Bi,the efficiency of array antenna is 60%?70%.