Research And Design Of Multi-function Reconfigurable Antenna

After entering the new century,the requirements of information warfare and the continuous iteration of civilian communication technologies have resulted in unprecedented development of military and civilian radio systems.The types and quantities of wireless communication equipment have continued to increase.However,the coupling and interference problems between the antennas are difficult to solve.The reconfigurable technology has great advantages in terms of increasing channel capacity and anti-jamming.Multifunctional reconfigurable antenna refers to the combination of multiple reconfigurable modes into the same antenna.Compared with a single-function reconfigurable antenna,the multifunctional reconfigurable antenna occupies less space.There are more applicable scenarios and more flexible performance adjustment can be achieved.This thesis focuses on the realization of the composite reconfigurable performance of the antenna,researches on pixel antennas,metasurface antennas,etc.Combined with intelligent algorithms and CMA theory,the frequency/pattern reconfigurable antenna,the pattern/polarization reconfigurable antenna and array were designed,the main contents are summarized as follows:(1)A multi-functional integrated reconfigurable antenna based on the parasitic pixels is proposed.The antenna is designed using silicon-based MEMS technology.The joint optimization technology is used to optimize the parasitic pixel surface topology.The reconfigurable performance of two operating frequencies(6.5GHz and 7GHz)and three beam directions(0°,±15°)are realized.Aiming at the practical application of the antenna,a capacitive MEMS switch is designed and a small insertion loss and a large isolation in the designed operation frequency band are achieved.Finally,the pixel antenna is integrated with the MEMS switch.The simulation results show that the frequency and pattern reconfigurable performance can be obtained.(2)A compact low-profile reconfigurable metasurface antenna was designed and processed.Through the CMA,the working mode of the combined structure of the microstrip patch and the metasurface is analyzed.Using a simple feeding network to excite two orthogonal degenerate modes,the antenna can be switched between three polarizations.In addition,by loading a ring-shaped pixel structure around the metasurface,the designed antenna can achieve beam deflection with horizontal polarization of±40°,vertical polarization of±20°,and circular polarization of±25°in the y-z plane.Due to the symmetrical structure of the antenna,the reconfigurable performance of polarization and pattern can also be achieved on the x-z plane.The total size of the antenna is 0.65?₀×0.65?₀×0.067?₀,which has a great advantage compared with existing antennas of the same type.(3)On the basis of the proposed reconfigurable metasurface antenna,a multifunctional reconfigurable array is further designed and processed.Simulated and measured results show that the antennas also have polarization diversity after forming the array.In addition,for the application of anti-jamming fuze,the anti-jamming performance of the reconfigurable antenna array is analyzed.The analysis results show that compared to the polarization reconfigurable antenna,the anti-jamming performance of the pattern/polarization reconfigurable antenna is better.Finally,the designed reconfigurable antenna array is used to design the fuze scheme.After conforming to the fuze carrier,the antenna array still maintains good reconfigurable performance.