Research And Design Of Satellite Communication Flat Panel Array Antenna

Compared with other waveguides,the substrate integrated waveguide is smaller in size,lower in profile,lower in cost and lighter in weight.Therefore,the planar array antenna designed based on the substrate integrated waveguide also has significant advan-tages,namely low profile and low cost.It is these advantages that make the planar array antenna based on substrate integrated waveguide gradually widely used in the field of mo-bile communication,radar and satellite communication.With the continuous development of information technology,the demand for antennas in modern communication systems is developing towards multi-function,low-profile and miniaturization.Therefore,the de-sign of low-profile,multi-functional planar array antennas has important application value in the field of satellite communication.This thesis mainly focuses on planar array anten-nas based on substrate-integrated waveguides.In response to the common problems of complex feed networks and only being able to achieve single frequency or polarization in conventional satellite communication planar array antennas,this article introduces two an-tennas designed with energy circulation structures and structure-composite transmission lines,respectively.The main content of the thesis is as follows:First,the development and research status of planar array antennas based on substrate-integrated waveguides are introduced,and the current research status on methods to im-prove the energy utilization of traveling wave antennas is discussed.The development pro-cess and research status of structure-composite transmission lines are described,and the research status of multi-frequency antennas designed on the basis of structure-composite transmission lines is explained.In the theoretical part,the main performance parameters of the antenna are introduced,and the working principles of substrate-integrated waveg-uides,substrate-integrated ridge waveguides,and the combined structure-composite ridge waveguide are explained,which lays the foundation for later design.Next,a circularly polarized slot antenna operating in the Ka band based on an energy-circulating structure was designed and implemented.The focus of the design was to intro-duce a power divider that can be used for energy circulation.The fabricated slot antenna was tested,and the results showed that the S₁₁of the antenna was less than-10 d B within the frequency range of 29.0 GHz～30.8 GHz,with a maximum gain of 12.04 d Bi and a beam pointing towards the normal direction.The axial ratio of the antenna was less than 3 d B within the frequency range of 29.62 GHz～30.26 GHz.Array simulations with higher gain were performed to verify the feasibility of the designed antenna for practical applications.Finally,a dual-frequency dual-polarization composite slot antenna was designed and implemented.The energy-circulating slot antenna operating in the Ka band and the stand-ing wave antenna operating in the Ku band based on substrate-integrated ridge waveguides were combined using structure-composite transmission lines to realize a slot antenna with dual-frequency and dual-polarization radiation performance.The antenna was fabricated and tested.The results showed that the Ku band standing wave antenna had resonance at12.90 GHz,with an S₁₁of-18.74 d B at the resonant frequency,a maximum gain of 9.53d Bi,a beam pointing towards the normal direction,and cross-polarization greater than 30d B.The Ka band antenna had an S₁₁less than-10 d B within the frequency range of 28.87GHz to 30.66 GHz,with a beam pointing towards the normal direction,a maximum gain of 13.76 d Bi,and an axial ratio less than 3 d B within the frequency range of 29.42 GHz to30.52 GHz.Array simulations with higher gain were performed to verify the feasibility of the designed antenna for practical applications.