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超高频和微波频段微小型窄带滤波器的设计,往往受到谐振元件体积的限制。虽然使用陶瓷基片可以缩小体积,但对一个片来说,不论有无电容缩短,1/4波长谐振线段还是太长了。此外,这些基片的损耗会降低滤波器的Q值,使插入捐耗增加,并降低通带边缘斜率。设计集总参数电路就可克服其中的某些缺点,但在频率和Q值上又会受到限制。一般说来,无源电磁滤波器要在体积和Q值之间进行折衷选择,不然就要用超导金属等其
The design of UHF and microwave band narrowband filters is often limited by the volume of resonant components. Although the use of ceramic substrates can reduce the size, but for a piece, with or without capacitor shortening, 1/4 wavelength resonant line is still too long. In addition, the loss of these substrates reduces the Q value of the filter, increases the insertion loss, and decreases the slope of the pass band edge. Design lumped parameter circuit can overcome some of these shortcomings, but in the frequency and Q value will be limited. In general, passive electromagnetic filter trade-off between the volume and the Q value, otherwise it is necessary to use superconducting metals