| With the further development of the fifth generation(5G)mobile communication,the spectrum resources are becoming increasingly tight below 6 GHz in the microwave frequency band,and the interference between bands is serious.Hence,people turn their attention to the millimeter-wave(MMW)band,which has rich spectrum resources.It is urgent to research and develop 5G millimeter wave technology in order to meet the demand of high-speed communication.Wideband antenna plays an important role in the ultra-high speed data transmission process,which is one of the important components of millimeter technology.However,the transmission loss is serious caused by the millimeter wave antenna,and the traditional series-fed array will result in the operating bandwidth drop dramatically.Consequently,a new form of transmission line of Substrate Integrated Waveguide(SIW)has been proposed.SIW is extensively applied in the design of millimeter wave array antennas,because it can realize the traditional metal waveguide function and features low insertion loss.Nevertheless,the bandwidth of the traditional SIW slot array is narrow,which cannot meet the requirements of high-speed communication.This thesis makes an in-depth exploration from the millimeter wave broadband array antenna and takes the improvement of working bandwidth by loading parasitic elements in SIW slot structure as the point of penetration.The primary research content of this thesis includes the following aspects:1.Design of millimeter wave broadband antenna element.Firstly,a SIW slot-coupled-fed microstrip antenna is proposed by adopting the design principles of SIW slot array and microstrip slot antenna,in addition,the above design method is also applicable to SIW loading other radiation elements.Based on the complementary principle of magneto-electric dipole,a SIW slot-coupled-fed MED antenna element is designed,which solves the problem of large cross polarization and low front to back ratio of the antenna.2.Linear array antenna fed by SIW transverse aperture coupling.Firstly,the dual-vibrator MED antenna element is proposed by improving the SIW slot-coupled-fed MED antenna element,which has the characteristics of wide band and stable gain within the bandwidth.Then design the SIW power divider and the SIW-CPWG adapter,and form a 1?8 array antenna with the dual-vibrator MED antenna elements,which has the performance of broadband and parallel feed framework.Finally,the above-mentioned antenna is processed and measured.The results showed that the-10 d B impedance bandwidth of the demonstrated 1?8 array is 31.43%,i.e.from 24 to 32.8GHz and the gain is from 11 to 13.2d Bi.3.Planar array antenna fed by SIW longitudinal aperture coupling.Firstly,the arc-shaped MED antenna element is proposed by combining the design concepts of magneto-electric dipole antenna,which has the advantages of broadband and miniaturization.Secondly,a 4?4 wideband array antenna is designed in view of the above antenna element,then the aerial array is processed and measured.The results showed that the-10 d B impedance bandwidth of the demonstrated 4?4 array is 18.9%,i.e.from 25.7 to 31 GHz and the gain is from 13.2 to 14.2 d Bi.The operating frequency bands of the array antenna include both the authorized millimeter-wave communication bands in North America and Asia,accordingly this antenna is suitable for multiple communication systems. |
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