Research On Microwave And Millimeter Wave High Gain Dual Polarized Antenna Array

The development of modern wireless communication systems has made the medium and low spectrum resources increasingly scarce.The microwave and millimeter-wave frequency bands have become a research and development hotspot for scholars at home and abroad due to their ultra-wide available spectrum resources,ultra-low transmission delay and ultra-high transmission rate.As an important part of communication system,antenna has extremely important application value and research significance.In order to comply with the development trend of high channel capacity,high transmission rate,low delay,and broadband in wireless communication systems,the research on microwave and millimeter-wave antennas is bound to develop in the direction of broadband,high gain,low profile,and multi-polarization.Therefore,in this paper,several high-gain and high-performance single/dual polarized array antennas are designed based on the substrate integrated waveguide,waveguide slot,and metal resonator in the Ku-band and W-band.The research mainly includes the following aspects:1.A high-gain cavity-backed array antenna based on substrate-integrated waveguide in Wband is designed.The radiating part and the feeding part are independent of each other.The radiating part is based on the substrate integrated waveguide resonant cavity,combined with the patch antenna,which effectively expands the bandwidth.The feeding part adopts waveguide power distribution network,which has lower transmission loss and guarantees the characteristic of high gain.A 16×16 array antenna is designed and tested.The measured results show that within the bandwidth(90 GHz to 96 GHz),the test gain can reach 30 d Bi and the highest gain is 31.6d Bi.The measured gain of the circular aperture array antenna designed based on the16×16 array antenna can be greater than 36.3d Bi within the bandwidth(92GHz to 94GHz)and the maximum gain can reach 36.5d Bi.The processing test results prove that this design scheme has the characteristics of simple structure,wide frequency band and high gain.2.A high-gain dual-polarized array antenna based on metal waveguide slot in Ku-band is designed.The radiation part of the array antenna adopts waveguide radiation slots.The radiating slots of two polarizations are perpendicular to each other,thus forming a cross shape,which can effectively improve the polarization isolation.In addition,the two polarization feed networks are independent of each other and the ingenious arrangement of coupling slots in structure can also ensure high isolation while realizing dual polarization.The simulated gain of the two polarizations of the circular aperture array antenna can maintain above 24.5d Bi in the bandwidth range.The antenna has been processed and tested,and the measured gain is about5 d B lower than the simulated gain.Through tolerance analysis,the source of deviation between the test and the simulation results has been located.On this basis,the optimization scheme proposed redesigns the feeding network,reduces the complexity of dual-polarization implementation,and reduces the number of layers during processing.From the simulation results,its standing wave performance and gain curve within the bandwidth are both better and more stable than the original one.3.A broadband high-gain dual-polarized array antenna based on metal waveguide slot in W-band is designed.In this design,a four-ridged waveguide is introduced as a transmission structure,which can effectively cut off higher-order modes.Combined with a cross-shaped radiation gap,the isolation between the two polarizations is better improved.By designing a wider radiation slot and re-optimizing the feed network,the relative bandwidth of the two polarizations of the 4×4 antenna element is increased to 10%.The theoretical simulation gains of the two polarizations of the circular aperture array antenna composed of the 4×4 array can be higher than 41 d Bi in the bandwidth of 91 GHz to 97 GHz.