公开(公告)号：KR1020060062299A

公开(公告)日：2006-06-12

申请号：KR1020040101087

申请日：2004-12-03

Applicant: 한국전자통신연구원

Inventor： 이수재 ,  문승언 ,  류한철 ,  곽민환 ,  강광용

IPC: H01L21/20

CPC classification number: H01L21/022 ,  H01G7/06 ,  H01L21/02197 ,  H01L21/0226 ,  H01L21/31691 ,  H01L28/56 ,  H01P1/181

Abstract: A ferroelectric/paraelectric multilayer thin film having a high tuning rate of a dielectric constant and small dielectric loss to overcome limitations of a tuning rate of a dielectric constant and dielectric loss of a ferroelectric thin film, a method of forming the same, and a high frequency variable device having the ferroelectric/paraelectric multilayer thin film are provided. The ferroelectric/paraelectric multilayer thin film includes a perovskite ABO 3 structure paraelectric seed layer formed on a substrate, and an epitaxial ferroelectric (Ba x Sr 1-x )TiO 3 thin film formed on the paraelectric seed layer. The high frequency variable device can realize a RF frequency/phase variable device having a high speed, low power consumption, and low prices and excellent microwaves characteristics.

公开(公告)号：KR100546759B1

公开(公告)日：2006-01-26

申请号：KR1020030056847

申请日：2003-08-18

Applicant: 한국전자통신연구원

Inventor： 류한철 ,  문승언 ,  곽민환 ,  이수재 ,  이상석 ,  김영태

IPC: H01Q21/00

CPC classification number: H01P1/181

Abstract: 본 발명은 인가 전압에 따라 유전율이 변하는 강유전체 박막을 이용한 초고주파 가변 소자에 관한 것으로, 인가 전압에 따라 위상 속도를 변화시키면서 특성 임피던스의 변화는 감소시킬 수 있는 분포 정수형 아날로그 위상 변위기 및 그 제조방법을 개시한다. 개시된 본 발명의 분포 정수형 아날로그 위상 변위기는, 기판 상에 라인 형태로 연장되는 CPW(coplanar waveguide)가 배치되어 있고, 상기 CPW에 주기적으로 다수의 강유전체 캐패시터가 로딩되어 있다. 강유전체 캐패시터는 패턴 형태의 강유전체 박막을 구비하여, 인가 전압의 영향을 받는 강유전체 박막을 캐패시터 면적 내부로 국한시킨다. 이에 따라, 인가 전압의 변화에 따른 위상 속도의 변화는 유지하면서 원치 않는 CPW의 특성 변화를 방지하고 박막 유전 손실을 줄임으로써 위상 변위기의 반사 손실 및 삽입 손실 특성을 향상시킬 수 있다.
강유전체 박막, 분포 정수형 아날로그 위상 변위기, CPW(coplanar waveqguide), 강유전체 캐패시터

公开(公告)号：KR100401124B1

公开(公告)日：2003-10-10

申请号：KR1020010013208

申请日：2001-03-14

Applicant: 한국전자통신연구원 ,  주식회사 텔웨이브

Inventor： 강광용 ,  한석길 ,  곽민환 ,  안달

IPC: H01P1/203

CPC classification number: H01P11/007 ,  H01P1/203 ,  H01P1/212 ,  Y10S505/701 ,  Y10S505/866

Abstract: Disclosed is a high-temperature superconductor low-pass filter for removing broadband harmonics in a wireless communication system. The high-temperature superconductor low-pass filter includes a coupled line section and a transmission line section, in which the coupled line section is connected in parallel with the transmission line section. The coupled line section has two microstrip open-stub type parallel stripe lines stacked on a high-temperature superconductor, and the transmission line section has one stripe line. Since the high-temperature superconductor low-pass filter has attenuation poles at a stopband, it has stopband characteristics to 7-8 times wider than a cutoff frequency. The high-temperature superconductor low-pass filter can easily remove sub-harmonics which are inevitably occurred in the wireless communication system.

Abstract translation: 公开了一种用于消除无线通信系统中的宽带谐波的高温超导体低通滤波器。 高温超导体低通滤波器包括耦合线路部分和传输线部分，其中耦合线路部分与传输线部分并联连接。 耦合线路部分具有堆叠在高温超导体上的两条微带开路短柱型平行条线，并且传输线部分具有一条条线。 由于高温超导体低通滤波器在阻带处具有衰减极点，所以它具有比截止频率宽7-8倍的阻带特性。 高温超导体低通滤波器可以容易地去除在无线通信系统中不可避免地发生的次谐波。

公开(公告)号：KR1020020073051A

公开(公告)日：2002-09-19

申请号：KR1020010013208

申请日：2001-03-14

Applicant: 한국전자통신연구원 ,  주식회사 텔웨이브

Inventor： 강광용 ,  한석길 ,  곽민환 ,  안달

IPC: H01P1/203

CPC classification number: H01P11/007 ,  H01P1/203 ,  H01P1/212 ,  Y10S505/701 ,  Y10S505/866

Abstract: PURPOSE: A high temperature superconductor LPF(Low Pass Filter) for removing broadband harmonics is provided to control easily an attenuation pole and extend a frequency range of a stopband to 10 times of a cutoff frequency by using a transmission line section and a coupled line section. CONSTITUTION: A couple of parallel conductive lines(244,245) is laminated on a high temperature superconductor epitaxial layer. The lead line(246) is extended from the first parallel conductive line(244) to an input terminal. The second lead line(247) is extended from the second parallel conductive line(245) to an output terminal. A conductive line(243) is used for connecting the first parallel conductive line(244) with the second parallel conductive line(245). A transmission line section(241) is formed with the parallel conductive lines(244,245). A coupled line section(242) is formed with the conductive line(243). A ratio of length of the transmission line section(241) to the coupled line section(242) is 2 to 1.

Abstract translation: 目的：提供用于去除宽带谐波的高温超导体LPF（低通滤波器），通过使用传输线部分和耦合线路部分来容易地控制衰减极点并将阻带的频率范围扩展到截止频率的10倍 。 构成：将一对平行的导线（244,245）叠层在高温超导体外延层上。 引线（246）从第一并行导线（244）延伸到输入端子。 第二引线（247）从第二平行导线（245）延伸到输出端子。 导线（243）用于将第一并联导线（244）与第二平行导线（245）连接起来。 传输线部分（241）形成有平行导线（244,245）。 耦合线路部分（242）形成有导线（243）。 传输线部分（241）与耦合线部分（242）的长度比为2比1。