Research On Millimeter Wave Antenna Array Based On Gap Waveguid

As a key component of the wireless communication system,the antenna is widely used in equipment systems such as radar communication,microwave remote sensing,and radio astronomy.With the development of modern communication systems,the operating frequency of antenna is getting higher and higher.In order to meet the needs of communication systems for high-gain,high-efficiency,and highly integrated planar antenna and array,a low-loss,easy-to-process gap waveguide(Gap waveguide,GWG)transmission structure has become a research hotspot.In this paper,based on GWG technology,a new type of Ka-band bandpass filter is proposed,and a high-gain filter antenna array is designed in combination with the microstrip antenna.Based on GWG low-loss transmission line and high-order mode resonator,a novel W-band antenna array with high gain and high radiation efficiency is designed.And the low-loss converters of the transition interconnection between GWG and other circuits have been intensively studied.The main contribution of this work is summarized as bellow:1.The theoretical basis of gap waveguide,filter theory and filter,diplexer design:Based on the basic theory of GWG and the basic principle of coupled resonant filter,a Ka-band series capacitive coupling resonant bandpass filter is designed,and the equivalent circuit model and theoretical analysis are presented.On this basis,the Ka-band filter power divider and diplexer are designed,and the feasibility of the designed filter and diplexer is verified through simulation.2.Ka-band high-gain filter antenna array design based on gap waveguide technology: The microstrip patch antenna unit working in the Ka band is designed,and the microstrip antenna sub-array fed by gap waveguide is proposed.The designed filter power divider is cascaded with the GWG feeding network,and a new filter power divider feeding network is proposed.The transitional conversion structure between GWG and rectangular waveguide and GWG in different planes is designed,and a new type of Ka-band filter antenna array is proposed,and the high gain and excellent frequency selection performance of the antenna array are verified through processing and measurement.3.The design of W-band high-gain antenna array based on gap waveguide technology: A feeding network in the form of joint feeding of GWG and high-order mode resonators is proposed,which reduces the complexity and transmission loss of the feeding network.The use of mechanical processing and printed circuit board hybrid processing technology reduces processing costs.Through actual measurement,the designed W-band antenna array has the characteristics of high gain and high radiation efficiency.