公开(公告)号：US20080010617A1

公开(公告)日：2008-01-10

申请号：US11667548

申请日：2004-11-19

申请人： Kazuyuki Hori

发明人： Kazuyuki Hori

IPC分类号： G06F17/50

CPC分类号： H03H7/21 ,  H03D7/18 ,  H03H2007/0192 ,  H03H2260/00

摘要： An object of this invention is to provide a method of designing a complex transfer function which can be realized in a passive RC complex filter at the same time while perfectly succeeding to features of a prototype lowpass characteristic. In this invention, as a first step, a prototype lowpass characteristic F(p) having a pole on a unit circle is designed. Next, as a second step, a bilinear variable transformation expressed by p=j(s−j)/(s+j) is performed with respect to the prototype characteristic F(p) to derive a complex coefficient transfer function G(s). As a third step, a passive RC complex filter H(s) is designed based upon the complex coefficient transfer function G(s).

摘要翻译： 本发明的目的是提供一种设计复杂传递函数的方法，该方法可以同时在无源RC复合滤波器中实现，同时完全成功地实现原型低通特征的特征。 在本发明中，作为第一步骤，设计了在单位圆上具有极点的原型低通特性F（p）。 接下来，作为第二步骤，针对原型特征F（p）执行由p = j（s-j）/（s + j）表示的双线性可变变换，以导出复系数传递函数G（s）。 作为第三步，基于复系数传递函数G（s）设计无源RC复滤波器H（s）。

公开(公告)号：US07029828B2

公开(公告)日：2006-04-18

申请号：US10466546

申请日：2001-10-01

申请人： Toshiyuki Takagi

发明人： Toshiyuki Takagi

IPC分类号： H03H9/25

CPC分类号： H03H9/02921 ,  B82Y10/00 ,  B82Y40/00 ,  H01J37/20 ,  H01J37/28 ,  H01J37/3174 ,  H01J2237/004 ,  H03H3/08 ,  H03H2260/00

摘要： In a tester for a surface acoustic wave device used as a filter for high frequency bands in the field of mobile communications, the tester includes: an electron gun generating an electron beam to be first electrons; a condenser lens for converging the electron beam on a substrate; an electron beam scanning portion for scanning the electron beam on the substrate; a secondary electron detector detecting second electrons generating from the substrate by irradiated first electrons; a substrate holder holding the substrate; and a conductive grounding tool which can contact the metal film. The grounding tool includes a contacting head. The grounding tool includes: a contacting head that can contact the grounding tool and the metal film; an arm portion arranged at the end of the contacting head; a shaft arranged at the other end of the contacting head, and rotating the arm portion. The substrate has a two-layer structure, which includes: a circular piezo-electric substrate including lithium tantalate (LiTaO3); and a metal film including aluminum (Al) formed on the piezo-electric substrate.

摘要翻译： 在用于在移动通信领域中用作高频带的滤波器的表面声波装置的测试器中，测试仪包括：产生电子束的电子枪为第一电子; 用于将电子束会聚在基板上的聚光透镜; 用于扫描基板上的电子束的电子束扫描部分; 二次电子检测器，检测通过照射的第一电子从衬底产生的第二电子; 保持基板的基板保持架; 以及可与金属膜接触的导电接地工具。 接地工具包括接触头。 接地工具包括：可接触接地工具和金属膜的接触头; 布置在接触头端部的臂部; 布置在接触头的另一端的轴，并使臂部旋转。 基板具有双层结构，其包括：包括钽酸锂（LiTaO 3 N 3）的圆形压电基板; 以及形成在压电基板上的包含铝（Al）的金属膜。

公开(公告)号：US06954119B2

公开(公告)日：2005-10-11

申请号：US10337781

申请日：2003-01-08

申请人： François Jeanjean ,  Geert Arthur Edith Van Wonterghem

发明人： François Jeanjean ,  Geert Arthur Edith Van Wonterghem

IPC分类号： H03H1/02 ,  H03H7/01 ,  H03H11/12 ,  H03H7/00

CPC分类号： H03H7/1766 ,  H03H7/06 ,  H03H7/427 ,  H03H2260/00

摘要： A passive filter arrangement and a method of providing such a filter is described. The frequency response of the filter arrangement is substantially the same as the frequency response of a first filter of an order having a first value, the frequency response of the first filter being representable by a first set of one or more poles and/or one or more zeros. Descriptions of a plurality of second filters are generated, each second filter having an order lower than the order of the first value, each second filter having a frequency response representable by a one or more poles and/or one or more zeros, the one or more poles and/or one or more zeros of each lower order filter being a subset of the first set. The lower order filters are cascaded.

摘要翻译： 描述了一种无源滤波器装置和提供这种滤波器的方法。 滤波器装置的频率响应基本上与具有第一值的次序的第一滤波器的频率响应基本相同，第一滤波器的频率响应可由第一组一个或多个极和/或一个或多个极表示， 更多零。 产生多个第二滤波器的描述，每个第二滤波器具有低于第一值的次序的顺序，每个第二滤波器具有可由一个或多个极和/或一个或多个零表示的频率响应， 每个低阶滤波器的多个极点和/或一个或多个零点是第一组的子集。 低阶滤波器级联。

公开(公告)号：US4184131A

公开(公告)日：1980-01-15

申请号：US926380

申请日：1978-07-20

申请人： Hermann A. Haus

发明人： Hermann A. Haus

IPC分类号： H03H9/02 ,  H03H9/64 ,  H03H9/26 ,  H03H9/32

CPC分类号： H03H9/02637 ,  H03H9/02685 ,  H03H2260/00

摘要： Surface acoustic wave resonators are used to provide band pass filters. The length of each resonator is related to the lumped constant inductor and capacitor values of the components of the low pass filter equivalent. This invention allows high frequency s.a.w. type filters to be constructed by reference to already available inductor and capacitor values from tables of low pass filter designs.

摘要翻译： 表面声波谐振器用于提供带通滤波器。 每个谐振器的长度与低通滤波器等效元件的集总常数电感和电容值有关。 本发明允许高频率s.a.w. 类型滤波器通过参考低通滤波器设计表中已经可用的电感和电容值来构造。