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以前,UHF频段采用的刊、型同轴谐振器,是属于半同轴谐振器的借助线路阻抗阶跃变化的谐振器(Stepped Impedance Resonator,SIR),关于采用这种谐振器的滤波器的特性,作者已报导过了。在本论文中,首先弄清SIR的谐振条件、空载Q值等基本特性,整理出其设计方法。其次,求出SIR的导纳斜率参数,并利用它导出电容耦合同轴SIR带通滤波器的设计公式,整理出其设计程序。最后,根据导出的设计公式、设计程序举例说明900MHz频段滤波器的制作。可以看出,制作滤波器的实测值和设计值是一致的。证实了设计公式的正确。这个设计方法对于窄带滤波器的合成是适用的,对于通常所采用均匀线路型谐振器的滤波器和采用充介质小型同轴谐振器的滤波器的设计,也是适用的。
In the past, the Journal coaxial coaxial resonator used in the UHF band was a Stepped Impedance Resonator (SIR) belonging to a semi-coaxial resonator with respect to the characteristics of a filter using such a resonator The author has already reported it. In this thesis, we first make clear the basic characteristics of SIR, such as resonant conditions and no-load Q value, and put forward the design method. Secondly, the admittance slope parameter of SIR is obtained, and the design formula of capacitively coupled coaxial SIR band-pass filter is deduced by using it, and the design procedure of the SIR bandpass filter is found out. Finally, according to the derived design formula, the design procedure illustrates the manufacture of a 900 MHz band filter. It can be seen that the actual value of the filter and the design value are the same. Confirmed the correct design formula. This design method is suitable for the synthesis of a narrow-band filter, and is also suitable for the design of a filter of a uniform line type resonator commonly used and a medium-type small-size coaxial resonator filter.