Electronic Scanning Leaky Wave Antenna Based On The Half Mode Corrugated Integrated Waveguide With Circular Polarization

With the continuous development of modern communication technology,the wireless systems in it have also been continuously updated.An extremely critical component of the wireless system-the antenna,is naturally constantly updated.The antenna which takes electromagnetic wave as the carrier of energy and signal i s an extremely critical component of wireless system.The performance of antenna directly determines the quality of wireless system.Because of its excellent characteristics of frequency sweeping,high gain and simple feeding-network,leaky wave antenna has been paid much attention in military and civil fields.If the elements or material with electronic controlling are further loaded on the leaky wave antenna,the beam angle can be adjusted and scanned freely.The transmission line as the main structure of the leaky wave antenna has also been continuously developed,and as a new type of guided wave structure,the substrate integrated waveguide has been widely used in the microwave and radio frequency field in recent years due to its advantages of low loss,low profile,and low cost.The research on the combination of substrate integrated waveguide and leaky wave antenna has also been continuously developed.However,there are still some key p roblems to be solved in the current use of substrate integrated waveguide structure which completes electronic scanning of leaky wave antennas research,including:1.The substrate integrated waveguide forms an equal potential body,which makes it difficult to load the dc bias circuit of the electronic controll element;2.It is still difficult to control the circular polarization of the electronic scanning leaky wave antenna.According to the above problems,this topic realizes the complete electronic scanning polarization at 5.8 GHz with the half mold corrugated integra ted waveguide structure,the designing method of the leaky wave antenna based on the corrugated integrated waveguide electronic scanning leaky wave antenna is presented,and it is presented that the half mode corrugated integrated waveguide electronic scanning circular polarization leaky wave antenna,RF signal feeding network and the dc feeding-network.The leaky wave antenna complete beam angle across 0°,which can scan from Angle-24 ° c to + 40 ° c with the dc controlling.The antenna has an advantage of impedance match,meanwhile,the realized gain is more than 9 dB,and axial ratio is less than 6 dB in the process of scanning,which shows the leaky wave antenna with excellent characteristics of circular polarized radiation.Furthermore,aiming at the two-dimensional scanning problem of electronically controlled scanning circular polarization leaky wave antenna,the beam controlling method of the two-dimensional leaky wave antenna is studied in this paper,and a two-dimensional beam scan control method based on the principle of phased array is proposed.After that,the original electronically controlled scanning circular polarization leaky wave antenna is designed in a miniaturized way to complete the array of the phased array,and the supporting one-minute eight-work splitter and phase-shifter control module are designed.Finally,the full-wave simulation is carried out to verify that the two-dimensional circular polarization beam scanning characteristics are excellent.