Design of Wide Stopband Cavity Filter for Public Network Interference Suppression in Power Base Station
With the rapid increase of mobile public network users and the adjustment of network parameters,the interference to the pow-er wireless private network becomes more and more serious.To solve this problem,a cavity filter for power base station is designed.The working frequency band is located at[1 790,1 800]MHz.The CQ structure with four cascaded cavities is adopted.Each rectangular cavity has a cylindrical resonator and a tuning screw,with inductive rectangular window for main line coupling and the capacitive cylin-drical rod for the cross coupling.Electromagnetic simulation results demonstrate its good performance of frequency selectivity as:>22 dB@f0±10 MHz,>60 dB@f0-[200,1 000]MHz,>73 dB@f0+[200,1 800]MHz,>60 dB@f0+[1 800,2 700]MHz and>50 dB@f0+[2 700,3 200]MHz,efficiently suppressing the interference from[800,5 000]MHz band of mobile public network.The size of the sys-tem is less than 40 mm×40 mm×20 mm,reaching a better trade-off of the requirements among ultra-narrow passband,wide stopband and small size.
power base stationprivate networkmobile communicationpublic networkinterferencecavity filterHFSS simulation
万方数据
维普
