无线电工程

针对接收机因发射机寄生输出引入干扰使系统无法正常工作的问题,需研制一种高功率带通滤波器,既要满足通带低损耗的传输又要对接收频带高的抑制度。滤波器传统设计方法包含大量理论计算和公式推导,整个设计过程非常繁琐。基于此问题,提出了一种场路协同设计大功率波导滤波器的方法,通过电路仿真软件Designer设计的滤波器得到带通滤波器的初值,再通过HFSS(High Frequency Structure)电磁仿真软件对初值进行优化仿真,最终完成了一种C频段高功率波导带通滤波器的设计。该大功率波导滤波器仿真结果很好地满足了设计目标,基于仿真结果,进行了小批量的加工。实测结果表明,该滤波器带内插损小于0.2 dB,驻波系数小于1.2,在5.1 GHz处阻带抑制度大于50 dB,整个滤波器的尺寸仅为240 mm×88.9 mm×63.5 mm。该大功率滤波器的实测结果与仿真结果有很好的吻合度,满足工程的设计要求。

In order to solve the problem that the receiver can't work properly because of the interference caused by the parasitic output of the transmitter,a high power bandpass filter should be developed,which can not only satisfy the low loss transmission of the passband,but also suppress the high frequency band of the receiver.Traditional design process of high power filters is very complicated and it contains a large amount of theoretical calculation and formula deduction.A method of high-power wave-guide filter based on field-circuit co-simulation design is proposed.The initial values of high-power bandpass filter are acquired by the filter designed by the circuit simulation software of Designer,and the initial values are optimized and simulated by the electromagnetic simulation software of HFSS,and finally a C band high-power wave-guide bandpass filter design is accomplished.The simulation results of the high-power bandpass filter meet the design goals well.Based on the simulation results,the small-batch production is conducted.The measured results show that it has an excellent characteristics with insertion loss less than 0.2 dB,VSWR less than 1.2,stop-band suppression more than 50 dB at 5.1 GHz,Furthermore,its dimension is only 240 mm×88.9 mm×63.5 mm.The measured results of this high-power filter fit well with the simulation results and it can satisfy the design requirements of project.