公开(公告)号：US20100182730A1

公开(公告)日：2010-07-22

申请号：US12447078

申请日：2007-10-19

申请人： Danielle Beelen ,  Mareike Klee ,  Klaus Reimann ,  Wilhelmus C. Keur ,  Rüdiger Mauczok

发明人： Danielle Beelen ,  Mareike Klee ,  Klaus Reimann ,  Wilhelmus C. Keur ,  Rüdiger Mauczok

IPC分类号： H01G7/06 ,  H01G7/00

CPC分类号： H01G7/06 ,  H01G7/028

摘要： The present invention relates to a ferroelectric varactor (400) that comprises a dielectric-layer stack (408) between electrodes (406, 410). The dielectric-layer stack comprises an alternating layer sequence of at least three dielectric layers. At cc least two first dielectric layers of the dielectric-layer stack are made of a non-single-crystalline first dielectric material having a first dielectric constant, at least one second dielectric layer of the dielectric-layer stack is made of a non-single-crystalline second dielectric material with a second dielectric constant that differs from the first dielectric constant. One of the first and second dielectric materials exhibits a weaker ferroelectric hysteresis. The dielectric material with the weaker ferroelectric hysteresis makes up more than 20% of the total volume of the dielectric-layer stack. The ferroelectric varactor of the present invention achieves high relative dielectric permittivities in the dielectric layers, a high breakdown voltage, a large tuning range at low voltages, and low dielectric losses.

摘要翻译： 本发明涉及一种铁电变容二极管（400），其包括电极（406,410）之间的电介质层叠层（408）。 介电层堆叠包括至少三个电介质层的交替层序列。 在cc的介电层堆叠的至少两个第一电介质层由具有第一介电常数的非单晶第一介电材料制成，介电层堆叠的至少一个第二介电层由非单一的 具有不同于第一介电常数的第二介电常数的晶体第二电介质材料。 第一和第二介电材料之一表现出较弱的铁电滞后。 具有较弱的铁电滞后的电介质材料占电介质层叠层总体积的20％以上。 本发明的铁电变容二极管在电介质层中实现高相对介电常数，高击穿电压，低电压下的大调谐范围以及低介电损耗。