公开(公告)号：EP0084854A3

公开(公告)日：1983-10-19

申请号：EP83100442

申请日：1983-01-19

Applicant: NEC CORPORATION

Inventor： Ogawa, Hiroshi

IPC: H01P01/203 ,  H01P01/205 ,  H01P01/212 ,  H01P01/201 ,  H01P01/207

CPC classification number: H01P1/2039 ,  H01P1/207

Abstract: The bandpass filter comprises line means (14, 15) extending from an input terminal (16) to an output terminal (17) and three stubs (11 to 13) respectively connected to said line means (14,15) at three different locations (a, b, a') of said line at a spacing which is 1/8 the wavelength of the center frequency of the passband. Each of said three stubs (11 to 13) is short-circuited at a first end and open at a second end and has a total length which is 1/4 the wavelength of said center frequency. The outermost stubs (11, 13) of said three stubs are connected to said transmission line means (14, 15) each at a position (a, a') thereof which is 1/6 the wavelength from said first end. The intermediate stub (12) of said three stubs is connected to said line means at a position thereof (b) which is one of 1/8 and 1/4 the wavelength of said center frequency. This bandpass filter has an improved stop or rejection characteristic against double and treble waves of its passband (Fig. 3).

公开(公告)号：EP0147248A3

公开(公告)日：1986-11-05

申请号：EP84401657

申请日：1984-08-09

Applicant: Mayer, Ferdy

Inventor： Mayer, Ferdy

IPC: H03H07/01 ,  H01B11/12 ,  H01P01/201

CPC classification number: H01P1/201 ,  H01B11/12 ,  H03H7/00

Abstract: Electromagnetic Filter, composed of at least one lossy mismatched electrical line element (or another lossy distributed wave propagating structure), having at one or both of its interfaces other distributed constant line structures or lumped components, chosen so as to introduce characteristic impedance discontinuities, characterized by:
a/ these interfaces represent lines with characteristic impedances different from the electrical line element, b/ these interfaces represent lumped components with impedances different from the electrical line element, c/ these interfaces represent mixed impedances a/ and b:

公开(公告)号：WO1998001918A1

公开(公告)日：1998-01-15

申请号：PCT/US1997007559

申请日：1997-05-05

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  VANGALA, Reddy, R.

IPC: H01P01/201

CPC classification number: H01P1/2056

Abstract: A ceramic filter with a coplanar shield which has: a filter body (302) comprising a block of dielectric material having top (304), bottom (306) and side surfaces (308, 310, 312, 314), and having a plurality of metallized through holes (316) extending from the top (304) to the bottom (306) surfaces defining resonators; a mettalization layer substantially coating the bottom (306) and the side surfaces (306, 310, 312, 314), and the top surface (304) having a metallized pattern thereon defining a top pattern; intput-output pads (318); and a conductive shield (322) having standoff legs (324) which maintain the conductive shield at a predetermined height above the top pattern of the filter body, the standoff legs (324) are connected to a portion of the top pattern on the top surface of the filter at a desired distance from the side surface having the input-output pads.

Abstract translation: 一种具有共面屏蔽的陶瓷过滤器，其具有：过滤体（302），包括具有顶部（304），底部（306）和侧表面（308,310,312,314）的电介质材料块，并且具有多个 从顶部（304）延伸到限定谐振器的底部（306）表面的金属化通孔（316）; 基本上涂覆所述底部（306）和所述侧表面（306,310,312,314）和所述顶表面（304）上的金属化图案的定量化层限定顶部图案; 输入输出垫（318）; 以及导电屏蔽（322），其具有将所述导电屏蔽保持在所述过滤器主体的顶部图案上方的预定高度的支撑腿（324），所述支座腿（324）连接到所述顶部图案的顶部表面的一部分 从具有输入 - 输出垫的侧表面到所需的距离处。

公开(公告)号：WO1995030249A1

公开(公告)日：1995-11-09

申请号：PCT/US1995001677

申请日：1995-02-10

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  HOANG, Truc ,  VANGALA, Reddy, R.

IPC: H01P01/201

CPC classification number: H01P1/2136

Abstract: A method of tuning a duplex filter (500). First, the center frequency of at least one filter of a duplex filter (10) is measured (502). Next, the difference between the measured center frequency and a desired center frequency is determined (504). And, third the duplex filter is tuned (506) by selectively removing a substantially planar layer of dielectric material for a top surface (14) of the filter (10), whereby the frequency characteristics are modified.

Abstract translation: 一种调整双工滤波器（500）的方法。 首先，测量双相滤波器（10）的至少一个滤波器的中心频率（502）。 接下来，确定测量的中心频率与期望中心频率之间的差异（504）。 并且，通过选择性地去除滤波器（10）的顶表面（14）的基本上平坦的电介质材料层，来调谐（506）第二双工滤波器，从而修改频率特性。