Research On Millimeter Wave Array Antenna Based On Gap Waveguide Feeding Network

New spectrum application development is gradually carried out in millimeter wave and even terahertz frequency bands with the increasing shortage of spectrum resources.In the communication system,the higher working frequency band can increase the data transmission rate and expand the communication capacity;in the radar imaging system,it has the advantages of larger bandwidth and higher resolution.New potential applications put forward requirements for antennas with high gain,low loss,low profile and compact structure.This paper intends to carry out the research of low-loss,multi-polarized planar array antennas in V-band and W-band.The main research contents and results are as follows:1.A W-band linearly polarized planar slot array antenna based on ridge gap waveguide feeding network is designed.First,starting from the gap waveguide theory,the dispersion mode method is used to calculate and analyze the electromagnetic band gap characteristics of the pintype EBG structure,and the design of the ridge gap waveguide feed network is completed.An8×8 planar slot array antenna based on the above-mentioned feed network achieves a-15 dB impedance bandwidth between 90-100 GHz,and the maximum gain of the array antenna is 26.4dBi.This structure is very suitable for realizing the design of millimeter wave three-dimensional stacked planar antenna.2.A W-band dual-polarization slot array antenna based on groove gap waveguide feeding network is designed.The design includes a dual-polarization radiation unit,an E-plane feed network based on groove gap waveguides,and a 4×4 dual-polarization slot array antenna.The groove gap waveguide feed network has the characteristics of compact structure and in-phase output.The center frequency of the dual-polarized array antenna is 94 GHz,and-15 dB impedance bandwidth is realized within 93-96.2 GHz,the antenna gain is 24 dBi,the polarization isolation is not less than 55 dB,and the antenna cross polarization level is less than-30 dB.The antenna pattern has good rotational symmetry on the E and H planes.The structure adopts a full metal gap waveguide design,and avoids direct electrical contact,and is suitable for realizing a low-loss,low-cost,high-frequency multi-polarization array antenna.3.A V-band circularly polarized magneto-electric dipole array antenna based on inverted microstrip gap waveguide is designed.The design includes a circularly polarized magnetoelectric dipole antenna unit,a gap waveguide feed network,a three-dimensional interconnection structure,and a 4×4 circularly polarized magneto-electric dipole array antenna structure.The designed 4×4 circularly polarized magneto-electric dipole array antenna has a reflection coefficient of less than-15 dB in 63 GHz-73 GHz,the axial ratio is between 2.6 dB and 3.8 dB in the target frequency band 66 GHz ? 71 GHz,and a maximum antenna gain of 21.2 dBi.4.Finally,the application of silicon micromachining technology in millimeter wave and terahertz frequency band is discussed and a metal waveguide coupler in terahertz frequency band and W-band gap waveguide power divider are designed and processed.