Design And Research On Active FSS Radome

With the advantages of traditional frequency selective surfaces(FSS) radome and the ability to achieve the stealth in working frequency by artificial regulation, active frequency selective surfaces(Active FSS) radome is adapt to the future information war and will become a trend in the development of radome necessarily. Based on the geometrical optics method and CATIA modeling software, the thesis design a multiband composites radome which works at Ku-band,K-band and Ka-band and study the realization of active FSS. Exploratory analysis and simulation on active FSS radome are given finally. The main innovation points and work are as follows:(1) Based on four port network theory, the transmission formulas of radome wall are derived and verified by HFSS software. A software to calculate the electromagnetic performance of the radome wall is also developed. Then a multiband A-sandwich radome wall is proposed, simulation and test results show that the power transmission efficiency of this radome wall is high than 85% at K-band、Ku-band and high than 80% at Ka-band when the incident angle is 0-45 degrees.(2) For the complex structure of radome, a software to calculate the electromagnetic performance of the whole radome is achieved, which has combined successfully the grid modeling system with complex structure and the geometrical optics method, with the help of CATIA software. A low profile multiband radome for mobile satellite communication system is proposed. The simulation results show that under the working frequency band of Ku、K and Ka band, the power transmission efficiency of the radome is not less than 92% within 0-70 degrees pitch scanning. The results of a radome sample between measurements and simulations make good agreements.(3) The adjustability of Active FSS resonant characteristics by loading PIN diode and varactor diode is analyzed in detail. Furthermore, we design a novel Active FSS based on combined structures. By changing PIN bias state, the transmission characteristics of resonant frequency band can be controlled, which prove the validity of realizing Active FSS.(4) The traditional A-sandwich radome wall and active frequency selective surface integration design is studied and an A-sandwich Active FSS radome wall is given in the thesis. By changing PIN bias state, we implement the adjustability of transmission coefficient of the radome wall at working band. All of these will benefit to the design of active FSS radome in future.