微带带通滤波器在射频系统中应用非常广泛,随着卫星通信技术的发展,对频段、带宽的要求越来越高,宽带微带带通滤波器的设计也益发的重要。文中分析了等宽耦合线节级联设计法设计平行耦合线带通滤波器的基本原理,应用自编设计程序设计并实现了一个相对带宽为33%的S波段平行耦合线带通滤波器,在电路结构的处理上考虑了小型化,测试结果表明性能满足指标要求。 The application of the microstrip band-pass filter in the radio frequency system is very wide. With the development of the satellite communication technology, the requirements on the frequency band and the bandwidth are getting higher and higher, and the design of the broadband microstrip band-pass filter is also beneficial. In this paper, the basic principle of parallel coupled line band-pass filter designed by cascade design of equal-width coupling line segment is analyzed. A S-band parallel coupled line bandpass filter with 33% relative bandwidth is designed and realized by self-designed program. In the processing of the circuit structure to consider the miniaturization, the test results show that the performance to meet the index requirements.