Study And Design Ultra-wideband Array With Mutual Coupling Method

With the development of society and the progress of science and technology,modern communication technology has been developed rapidly and the data in the military and the civil fields are growing rapidly.Whether it is in the upcoming 5G filed or Internet of Things in a corner with a lot of information exchange,and the amount of communication data showing a trend of explosive growth.Antenna in the communication system plays the role of sending and receiving information,which is very important in communication system.According to Shannon's theorem,the larger the bandwidth,the greater the amount of information can be transmitted,so the ultra-wideband antenna will come into being;for the sake of beauty,easy installation and easy conformal,and the low profile requirements of the antenna.The use of multiple antennas in communication system can reduce the impact of Rayleigh fading and increase the amount of data in the communication system,but the general phased array antenna array will be affected by floor and mutual coupling which will reduce the performance of the communication system.In recent years appear a new ultrawideband antenna design method: Tightly Coupled Antenna Array.In this paper,the mutual coupling effect of array antenna is studied and utilized by means of tightly coupled antenna array design.The main work of the paper includes the following parts:1?The principle of plane tight coupled antenna is analyzed.The influence of floor on the impedance and bandwidth of planar antenna is analyzed.Then,the equivalent circuit and impedance of the tightly coupled antenna array are analyzed,and the limit bandwidth achievable with the floor plane antenna under different conditions is discussed.2?A tightly coupled ultra-wideband interconnected helical antenna is designed,and the bandwidth of the antenna 5GHz-30GHz(6:1)is studied and analyzed.In the design of the antenna array unit when the unit between the mutual coupling factor take into account,using the master and slave boundary method simulation of the infinite antenna array.After optimizing the array of antenna elements,an array of antennas 3×3 has a good gain bandwidth and an axial bandwidth.Finally,we analyze some of the balanced feed balun commonly used in structural symmetric antenna,and design a bandwidth of balun 1GHz-9.5GHz,which is simple and easy to process and easily for antenna integrate.3?The tightly coupled dipole antenna is studied and analyzed.The antenna element is simulated by the infinite cycle,and the circuit is equivalent to the antenna.The influence of the coupling effect on the antenna bandwidth is analyzed from the two ideas of the field and the road respectively.Then,the edge truncation effect of the finite element antenna array is analyzed,and the edge truncation effect is effectively reduced by extending the edge element antenna arm.Finally,an antenna array 8×8 is designed and the scanning performance of the antenna is analyzed.The antenna array in the final realization of the bandwidth range 1.4GHz-8.4GHz(6:1),when scan to 0-45 ° the antenna performance is also very good.