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1. 发明授权

US4449108A Band-stop filter for VHF-UHF band 失效
标题翻译： VHF-UHF频段的带通滤波器
公开(公告)号：US4449108A
公开(公告)日：1984-05-15
申请号：US348768
申请日：1982-02-16
申请人： Haruyoshi Endo , Mitsuo Makimoto , Ko Kikuchi , Sadahiko Yamashita
发明人： Haruyoshi Endo , Mitsuo Makimoto , Ko Kikuchi , Sadahiko Yamashita
IPC分类号： H01P1/213 , H01P1/20 , H01P1/202 , H03H7/01 , H03H7/46 , H01P7/04
CPC分类号： H01P1/202
摘要： A band-stop filter for VHF-UHF band comprises at least three series resonance circuits and at least two transmission lines each connected between the series resonance circuits. One of the transmission lines, which is connected to the input terminal of the band-stop filter, has an electrical length which is shorter or longer than the quarter wavelength of the center frequency of the stop band by more than 20 but less than 50 percent. When a band-stop filter comprises four transmission lines, one of the transmission lines, which is connected to the output terminal of the band-stop filter, has the same length as the transmission line connected to the input terminal. With this arrangement, the band-stop filter exhibits a sharp attenuation characteristic in a frequency range below or above the center frequency. Other transmission lines, which are not directly connected to either the input terminal or the output terminal, may have a length which is shorter or longer than the quarter wavelength by 5 to 20 percent so as to provide a sharper attenuation characteristic.
摘要翻译：用于VHF-UHF频带的带阻滤波器包括至少三个串联谐振电路和至少两个连接在串联谐振电路之间的传输线。连接到带阻滤波器的输入端子的传输线之一具有比阻带的中心频率的四分之一波长短或长的电长度大于20但小于50％的电长度。当带阻滤波器包括四条传输线时，连接到带阻滤波器的输出端的传输线之一具有与连接到输入端的传输线相同的长度。通过这种布置，带阻滤波器在低于或高于中心频率的频率范围内表现出明显的衰减特性。不直接连接到输入端子或输出端子的其它传输线路可以具有比四分之一波长短或长于5％至20％的长度，以便提供更清晰的衰减特性。

2. 发明授权

US4437076A Coaxial filter having a plurality of resonators each having a bottomed cylinder 失效
标题翻译：同轴滤波器具有多个谐振器，每个谐振器都具有有底圆筒
公开(公告)号：US4437076A
公开(公告)日：1984-03-13
申请号：US348766
申请日：1982-02-16
申请人： Mitsuo Makimoto , Haruyoshi Endo , Ko Kikuchi , Sadahiko Yamashita
发明人： Mitsuo Makimoto , Haruyoshi Endo , Ko Kikuchi , Sadahiko Yamashita
IPC分类号： H01P1/202 , H01P1/205 , H01P7/04
CPC分类号： H01P1/2053
摘要： In a coaxial filter arrangement having a plurality of coaxial resonators each having a bottomed metallic cylinder interposed between a dielectric plate and one end of a center conductor of each resonator, the peripheral wall portion of the metallic cylinder is received in the bore of an outer conductor having an open end and a closed end connected to the other end of the center conductor. In one embodiment, the bottom of the metallic cylinder has a convex portion at its center so that the bottom center projects outwardly. In another embodiment, an annular metallic member is interposed between the dielectric plate and the outer surface of the flat bottom of the metallic cylinder. Since the distance between bottoms of metallic cylinders of adjacent resonators is made large with this arrangement, influence due to leakage flux of electromagnetic field is small, while stray capacitance is negligibly small, thereby providing a filter having high performance and low loss.
摘要翻译：在具有多个同轴谐振器的同轴滤波器装置中，每个同轴谐振器具有插入介电板和每个谐振器的中心导体的一端之间的有底金属圆柱体，金属圆筒的周壁部分容纳在外导体的孔中具有连接到中心导体的另一端的开口端和封闭端。在一个实施例中，金属圆筒的底部在其中心处具有凸起部分，使得底部中心向外突出。在另一个实施例中，环形金属构件介于电介质板和金属圆筒的平底部的外表面之间。由于这种布置使相邻谐振器的金属圆筒的底部之间的距离变大，所以由于电磁场的漏磁通引起的影响小，而杂散电容变小，从而提供具有高性能和低损耗的滤波器。

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