把下面这段话翻译成英文无线通信系统的迅猛发展使得人们对器件性能有了更近一步的追求。滤波器作为关键的选频器件其滤除特定频点的能力直接影响着通信系统的性能具有广阔的应用前景和研究价值。本设计是基于阶梯阻抗结构的通信射频滤波器滤波器采用四分之一波长阶梯阻抗结构基于电磁耦合谐振理论实现滤波功能使用HFSS软件对滤波器电路进行了建模仿真并制作了电路实物测试对比仿真结果滤波器中心频率为35Ghz在3dB的相对

The rapid development of wireless communication systems has led to a further pursuit of device performance. As a key frequency selection device, filters directly affect the performance of communication systems by filtering out specific frequency points and have broad application prospects and research value. This design is a communication RF filter based on a ladder impedance structure. The filter uses a quarter-wavelength ladder impedance structure to implement the filtering function based on electromagnetic coupling resonance theory. The filter circuit was modeled and simulated using HFSS software, and a physical circuit was fabricated and tested against the simulation results. The center frequency of the filter is 3.5GHz, with a relative bandwidth of 15.1% at 3dB, a minimum passband insertion loss of 1.09dB, and a return loss better than 20dB, with an out-of-band transmission zero point. The filter has achieved the advantages of low insertion loss, high return loss, and compact physical size. The filter can be used in communication systems, radar systems, and other fields