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    • 5. 发明申请
    • Microwave band-pass filter
    • 微波带通滤波器
    • US20060220765A1
    • 2006-10-05
    • US11389283
    • 2006-03-27
    • Johannes MullerMichael Hoeft
    • Johannes MullerMichael Hoeft
    • H01P1/205
    • H01P7/04H01P1/2053
    • The present invention relates to a microwave band-pass filter comprising a plurality of coupled resonators including at least one coaxial resonator (1). For suppression of higher order or spurious pass-bands the filter is characterised in that a central hole (9) extends from the upper end of the inner conductor (6) of said at least one coaxial resonator through at least part of the length of the inner conductor, the central hole (9) forming a wave guide section, the cut-off frequency of which being above the pass-band of the band-pass filter, and in that the wave guide section contains in an upper portion (11) thereof a low loss dielectric material with a dielectric constant sufficiently high so that the cut-off frequency of the wave guide section is below the first higher order response of the band-pass filter, and in that the lower end portion (10) of the central hole (9) contains a lossy material.
    • 微波带通滤波器技术领域本发明涉及包括至少一个同轴谐振器(1)的多个耦合谐振器的微波带通滤波器。 为了抑制高阶或杂散通带,滤波器的特征在于,中心孔(9)从所述至少一个同轴谐振器的内部导体(6)的上端延伸通过所述至少一个同轴谐振器的至少一部分长度 内导体,中心孔(9)形成波导部分,其截止频率高于带通滤波器的通带,并且波导部分包含在上部(11)中, 其具有足够高的介电常数的低损耗介电材料,使得波导部分的截止频率低于带通滤波器的第一高阶响应,并且其中的下端部分(10) 中心孔(9)包含有损耗材料。