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公开(公告)号：JPS6229921B2
公开(公告)日：1987-06-29
申请号：JP4396978
申请日：1978-04-14
Applicant: JAPAN RADIO CO LTD
Inventor： YAMAKO ISASHIGE
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公开(公告)号：JPS59194502A
公开(公告)日：1984-11-05
申请号：JP7031483
申请日：1983-04-20
Applicant: Matsushita Electric Ind Co Ltd
Inventor： MINATO TAKESHI
CPC classification number: H01P1/201
Abstract: PURPOSE:To obtain about 40dB attenuation at 800MHz and to obtain sufficiently practical trap effect reducing loss at 900MHz+ or -25MHz less than 30dB, by connecting a 1/4 wavelength leading and opening line and capacitive reactance to a transmission line. CONSTITUTION:The 1/4 wavelength leading end opening line 2 of 800MHz is connected to a transmission line 1 of 50OMEGA. A capacity reactance 3 is connected to the same coupling point P. Since the impedance of the line 2 approaches zero at 800MHz, the line 2 is acted as a trap circuit. However, the line 2 is acted as an inductive reactance at the wavelength of frequency higher and close than/ to 800MHz. Therefore, selection of the value of capacitive reactance 3 makes it possible to cancel the inductive reactance and make the reactance approach specific impedance. When the impedance of a transmission line 1 approaches the specific impedance, the loss of insertion can be regarded as approximately zero.
Abstract translation: 目的：在800MHz时获得约40dB的衰减，并通过将1/4波长的导通线和开路线与电容电抗连接到传输线，获得足够实用的陷波效应，减少900MHz +或-25MHz的损耗，小于30dB。 构成：800MHz的1/4波长的前端开路线2连接到50OMEGA的传输线1。 容量电抗3连接到相同的耦合点P.由于线路2的阻抗在800MHz处接近零，所以线路2用作陷波电路。 然而，线路2在频率高于/高于800MHz的频率的波长处用作感抗。 因此，选择容性电抗3的值可以消除感抗并使电抗接近特定的阻抗。 当传输线1的阻抗接近特定阻抗时，插入损失可以被认为是近似为零。
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