公开(公告)号：GB2284942B

公开(公告)日：1997-06-18

申请号：GB9425244

申请日：1994-12-14

Applicant: KOREA ELECTRONICS TELECOMM ,  KOREA TELECOMMUNICATION

Inventor： SUNG HEE KYUNG ,  LEE CHANG HWA ,  KIM TAE HONG ,  LEE SANG SEOK ,  CHOI TAE GOO

IPC: H01P1/205 ,  H01P5/08 ,  H01P7/04

Abstract: A dielectric resonator includes a dielectric block having an open surface at one of the surfaces thereof, the remaining surfaces being plated with a conductor. The dielectric block has an inner conductor hole formed at a surface of the dielectric block opposite to the open surface, the inner conductor hole extending a predetermined depth toward the open surface such that it does not perforate through the open surface. An electrode pattern is formed on the open surface such that it faces an end surface of the inner conductor hole, the electrode pattern being adapted to provide an input/output capacitor. The dielectric block has a coupling window formed on a predetermined portion of one of the surfaces of the dielectric block, except for the open surface and the surface formed with the inner conductor hole, at a position adjacent to one of the open surface and the surface formed with the inner conductor hole. The coupling window is free of the plated conductor and adapted to control a coupling degree of the resonator to another resonator. Other embodiments include integral type filters having resonators in a single dielectric block.

公开(公告)号：GB2284942A

公开(公告)日：1995-06-21

申请号：GB9425244

申请日：1994-12-14

Applicant: KOREA ELECTRONICS TELECOMM ,  KOREA TELECOMMUNICATION

Inventor： SUNG HEE KYUNG ,  LEE CHANG HWA ,  KIM TAE HONG ,  LEE SANG SEOK ,  CHOI TAE GOO

IPC: H01P1/205 ,  H01P5/08 ,  H01P7/04

Abstract: A dielectric resonator comprises a dielectric block 301 with a first electrode 305 formed on a first surface 302 and a second electrode 304 formed within an inner conductive hole 303 extending from the surface opposite the first surface 302, towards but not reaching the first surface 302, such that the first and second electrodes 304, 305 face each other to form a coupling capacitor and a conductive layer formed on one or more of the remaining surfaces. The resonators may be combined to form a filter arrangement. The filter may include window and groove arrangements to adjust the coupling between the resonators. The inner conductive hole 303 may have a circular, elliptical or quadrilateral cross sectional shape. The first electrode 305 may extend to an edge of the dielectric block 301 to form a connection terminal allowing direct surface mounting on to a circuit board.

公开(公告)号：JPH10139544A

公开(公告)日：1998-05-26

申请号：JP22927097

申请日：1997-08-26

Applicant: KOREA ELECTRONICS TELECOMM ,  KOREA TELECOMMUN

Inventor： PARK JUNG RAE ,  KIM TAE HONG ,  LEE SANG SUK ,  CHOI TAE GU

IPC: C04B35/00 ,  C04B35/26 ,  C04B35/40 ,  C04B35/50 ,  H01F1/34 ,  C04B35/495

Abstract: PROBLEM TO BE SOLVED: To provide a magnetic ceramic compsn. having proper saturation magnetization, a small half-width of ferrimagnetic resonance and a low temp. coefft. of saturation magnetization by using yttrium oxide, iron oxide, tin oxide, aluminum oxide and a calcium feeding source as essential components. SOLUTION: Yttrium oxide is mixed with iron oxide, the oxide, aluminum oxide and calcium carbonate or calcium oxide so as to give a compsn. represented by the formula Y3-x Cax/2 Snx/2 Fe5-y Aly O12 (where 0.1

公开(公告)号：FR2755128B1

公开(公告)日：1999-07-23

申请号：FR9704809

申请日：1997-04-18

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： PARK JUNG RAE ,  KIM TAE HONG ,  LEE SANG SUK ,  CHOI TAE GU

IPC: C04B35/00 ,  C04B35/26 ,  C04B35/40 ,  C04B35/50 ,  H01F1/34 ,  C04B35/457 ,  C04B35/64 ,  H01F1/10

Abstract: A material for microwave band devices used by the general people and in industrial electronic apparatuses is disclosed. Particularly, a magnetic ceramic composition for use in microwave devices, a magnetic ceramics for use in microwave devices and a preparation method therefore are disclosed, in which the saturation magnetization can be easily controlled, and a low ferri-magnetic resonance half line width and an acceptable curie temperature are ensured. The magnetic ceramic composition for microwave devices includes yttrium oxide (Y2O3), iron oxide (Fe2O3), tin oxide (SnO2), aluminum oxide (Al2O3) and a calcium supply source. The magnetic ceramics for the microwave devices are manufactured by carrying out a forming and a sintering after mixing: yttrium oxide, iron oxide, tin oxide, aluminum oxide and calcium carbonate (or calcium oxide) based on a formula shown below. It has a saturation magnetization of 100-1,800 G at the normal temperature, a temperature coefficient for the saturation magnetization of 0.2%/ DEG C., and a ferri-magnetic resonance half line width of less than 60 Oe, Y3-xCax/2Snx/2Fe5-yAlyO12 where 0.1

公开(公告)号：FR2755128A1

公开(公告)日：1998-04-30

申请号：FR9704809

申请日：1997-04-18

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： PARK JUNG RAE ,  KIM TAE HONG ,  LEE SANG SUK ,  CHOI TAE GU

IPC: C04B35/00 ,  C04B35/26 ,  C04B35/40 ,  C04B35/50 ,  H01F1/34 ,  C04B35/457 ,  C04B35/64 ,  H01F1/10

Abstract: A novel magnetic ceramic composition and a novel magnetic ceramic used in microwave devices and containing yttrium oxide, iron oxide, tin oxide, aluminium oxide and a calcium source (preferably the carbonate or oxide), are based on formula (I): Y3-xCax/2Snx/2Fe5-yAlyO12, where x = 0.1-1 and y = 0.1-1.5. Also claimed is a process for producing a magnetic ceramic for microwave devices involving: (a) mixing yttrium oxide, iron oxide, tin oxide, aluminium oxide and calcium carbonate or oxide to form a mixture based on the above formula (I); (b) drying and calcining at 1,100-1,200 deg C for 1-3 hrs. to form a calcined powder; (c) adding a binder and then moulding the powder; and (d) sintering at 1,300-1,500 deg C in air.