Design Of Filtering Antenna Based On Substrate Integrated Waveguide And Microstrip Hybrid Structure

With the rapid development of wireless communication,especially the arrival of the fifth generation of mobile communication,the requirements on high-performance communication systems become higher and higher.The miniaturization of communication systems is one of the most important directions.Due to the rapid development of semiconductor technology,active circuits have already been integrated.Then,the miniaturization of passive circuits and antennas become one of the critical factors restricting the miniaturization of communication systems.As a multifunctional component that integrates filters and antennas,two key passive structures,the filtering antenna is an important direction for miniaturization.In this paper,two highly integrated antenna arrays are formed by using substrate integrated waveguide(SIW)resonators and microstrip patch antennas,then two small filter antenna arrays with high gain,high integration,and high out-of-band rejection are realized in the 5G millimeter wave band.The main contribution of this dissertation is as follows:(1)Filter antenna array design based on SIW resonator and patch antenna.In this configuration,the patch antenna is treated as the last stage of the filter.It is designed as a power divider with filtering response using the coupling between SIW resonators.Then it is directly coupled with two patch antennas to obtain a 4th-order filter antenna array.Finally,in order to suppress the parasitic response,a low-pass filter is embedded without changing the size of the antenna,which has a good rejection on the parasitic response.(2)Filter antenna array design based on SIW resonator and stacked patches.First,cross coupling is introduced between SIW cavities.Due to the presence of cross coupling and stacked patch antennas,two transmission zeros are generated out of the passband.In order to accomplish the efficient tuning of this filter antenna,the zero-pole based method is developed to overcome the difficulties of diagnosis and tuning,resulted from its complex structure and numerous parameters.Finally,a highly integrated antenna array is achieved with high gain and high selectivity.