Research On High Performance Millimeter Wave Filter Antenna And Array Based On SIW

As a research hotspot in the field of communications,5G communication has attracted extensive attention from researchers at home and abroad.Millimeter-wave(mm W)technology can achieve ultra-high-speed wireless data transmission by increasing the spectrum bandwidth,thus becoming one of the key technologies of 5G communication.Developing highly integrated devices with low power consumption and multi-functions has become a new trend in mm W RF front end.In this study,the frequency selective surface(FSS)and defected ground structure(DGS)are utilized to integrated with the proposed planar integrated horn antenna to realize a mm W filtering antenna with a simple structure.The main contents can be summarized as follows:1.SIW-based planar integrated millimeter wave horn antenna element:A TE₂₁₀-mode substrate integrated waveguide(SIW)cavity backed patch antenna is used as the excitation of the proposed planar integrated horn.The SIW cavity and the patch,respectively,determines the two resonant modes of the element.The simulated results show that the mm W element has a reflection coefficient from 22.72 GHz to 27.83 GHz,means a relative impedance bandwidth of 20.21%,and a peak gain of 10.90 d Bi.The cross-polarization level in the operating frequency band is lower than-28 d B.2.SIW-based planar integrated millimeter-wave horn antenna array:Based on the proposed planar mm W horn antenna element,a 4×4 planar integrated mm W antenna array is constructed.A compact series-parallel feed with an out-of-phase center feeding network is adopted.The insertion loss of the whole feeding network is less than 1 d B.The amplitude imbalance between the eight output ports is less than 0.31 d B.The phase imbalance between the in-phase output ports is less than 0.51°,and it is less than 180°±0.67°between out-of-phase ports.Then,a 4×4 series-parallel fed mm W antenna array is developed based on the element and the feeding network.A RWG-to-SIW transition structure is used to excite the antenna array.A prototype centered at 25.5 GHz was fabricated and measured.The measured results demonstrate that large impedance bandwidth,high gain and a radiation null at the lower band edge can be obtained.3.Research on SIW-based millimeter-wave filtering antenna array:The FSS and DGS structures are integrated with the planar mm W horn antenna element to form a filtering response.The simulated results indicate that an operating band from 23.8 to 27.1 GHz(12.9%),a peak gain of8.54 d Bi,a cross-polarization level of-20 d B and an out-of-band suppression level of 19.3 d B can be obtained by the filtering element.Then a 4×4 series-parallel fed filtering array is developed based on the filtering element and the aforementioned feeding network.The proposed mm W filtering antenna array centered at 25.5 GHz has an impedance bandwidth of 15.44%,a peak gain of 20.59d Bi and an out-of-band suppression level above 28.6 dB.