| As two extremely important components in a wireless communication system,the filter and the antenna have a decisive influence on the overall performance of the system.At present,more and more scholars in the industry have begun to study the integrated design scheme of the filter and the antenna.Designing the filter and the antenna as a whole can correspondingly reduce the additional connectors and matching circuits,so it can significantly improve the integration of the system.At present,there are relatively few applications of this design idea in the millimeter-wave frequency band.In addition,there are many ways of plane integration in integrated design,and most of them use traditional connection methods to connect with external systems.This integration scheme reduces the overall integration of the system and is difficult to meet the requirements of high-density integrated antenna array systems.In view of the above problems,this paper focuses on the application requirements of 5G millimeter wave,and studies the integrated design technology of filtering and antenna based on SIW resonator and its three-dimensional heterogeneous integration technology.The main contents and innovations of this thesis are as follows:1.The characteristics of SIW resonators and the design mechanism of microwave filters based on SIW resonators are studied,and a planar integrated SIW cavity filter with a center frequency of26 GHz is designed.In order to further improve the filter integration and miniaturization ability and solve the problem of excessively large size of the filter based on the planar structure design,the three-dimensional integrated design technology of SIW filter is studied,especially the research on the feed structure under the three-dimensional integrated structure.In this paper,a slot-coupled feed structure based on quasi-coaxial-shielded stripline conversion is proposed,and based on the proposed feed structure,a three-dimensional stacked SIW filter with a center frequency of 26 GHz is designed.Compared with the traditional filter with via feeding structure,the external Q value of input and output is easy to be flexibly and accurately controlled,and it is especially suitable for the engineering realization of millimeter wave filter.2.Based on the slot coupling feed structure proposed above,this paper uses a fusion design method of the slot antenna radiating element and the three-dimensional integrated stack filter,that is,by fitting the input reflection coefficient curve of end resonator of the three-dimensional integrated stack filter and the slot antenna radiating element to realize the equivalent replacement of the latter for the former,so as to realize the seamless integration of the slot antenna and the three-dimensional integrated stack filter.According to the above method,based on multi-layer PCB technology andBall Grid Array(BGA)packaging technology,the design of the three-dimensional integrated filter antenna unit and its array with a center frequency of 26 GHz is completed,and a high-density integrated antenna array and external system interconnection structure and its feed network are proposed.The size of the antenna array is 17.85 mm ×17.85mm×3.84 mm.3.A novel high-Q-value SIW resonant cavity structure based on BGA ball stacking structure is proposed.Based on the cavity structure,a stacked filter and filter antenna are designed respectively.The center frequency is 35 GHz and the relative bandwidth is 2.86%,and its dimensions are5.3mm×5.3mm×1.84 mm and 5.79mm×5.28mm×1.84 mm respectively.The insertion loss of the stacked filter is 1.22 dB at the center frequency,and the maximum insertion loss in the band is1.75 dB.The size of the air-embedded filter antenna array designed after that is10.8mm×10.2mm×1.84 mm,and the in-band gain reaches 10 dB. |
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