高可靠性发夹型带通滤波器的设计与制作

依据微带发夹型带通滤波器的原理,进行了数学建模,并结合ADS2008的优化仿真功能对滤波器进行了优化设计。根据仿真结果,在高介电常数的陶瓷基板MgTiO3-CaTiO3-Nd2O3,εr=18,Q·f=65000(7GHz),板厚度0.8mm]上制作了中心频率f0=3.5GHz、带宽为3.25~3.75GHz的滤波器。经测试发现,制得的滤波器具有良好的端口反射特性,可靠性高,基本满足3.25~3.75GHz频率范围内的特殊通讯要求。这表明本研究所用设计方法合理,适合于工程应用。

Design and fabrication of hairpin bandpass filter with high reliability

Mathematical models were established according to the principle of microstrip hairpin bandpass filter, and the design was then optimized using the simulation function of the software ADS2008. Based on the simulation results, microstrip hairpin bandpass filter, with a central frequency f0 = 3.5 GHz and a bandwith ranging from 3.25 GHz to 3.75 GHz, was fabricated on the high-permittivity ceramic substrate MgTiO3-CaTiO3-CeO2, εr = 18, Q?f = 65 000(7 GHz)] with a thickness of 0.8 mm. The results show that the fabricated filter exhibits excellent port-reflection performance and high reliability, meeting the requirements of the special communication application iin the frequency band from 3.25 GHz to 3.75 GHz. This indicates that the design method is reliable and suitable for engineering applications.