本文阐述一种能与微波集成电路结合使用的新型介质谐振器带通滤波器。这种滤波器是目前能用于微波集成电路的性能最佳的一种窄带滤波器。本文对这种滤波器作了理论分析;并导出了有关滤波器设计的主要公式;给出了一至四谐振器带通滤波器的实测性能。例如:一个相对带宽为 0.2％的 5cm三谐振器滤波器,其带内插损为 0.8dB左右,带外衰减大于50dB,30dB与 3dB的带宽比约为 3.3。
Miniature narrow band filters with high performance can be formed by means of high Q and low temperature coefficient dielectric resonators, such as barium titanate, which are reasonably placed in a cut-off waveguide and properly excited. This paper describes a new type dielectric resonator band-pass filter which can be combined with MIC. At present, this kind of filter is the best one of the filters used in MIC. It has been shown, for example, that a 5 cm band-pass filter using three dielectric resonators with relative bandwidth of 0.2% has an insertion loss of about 0.8 dB, the attenuation outside the band over 50 dB, and the ratio of 30 dB to 3 dB bandwidth approximately 3.3. This filter has been theoretically analysed, and some interesting formulae are derived. The practical measured performances for 1-to 4-resonator band-pass filters are presented.