发明名称 |
BANDPASS FILTER AND PROCESS OF FABRICATING THE SAME |
摘要 |
A bandpass filter includes a combination of a BAW filter and a patterned planar filter with stubs. The BAW filter is composed of a plurality of piezoelectric resonators to give a specific frequency bandpass, while the planer filter is configured to attenuate frequencies near and outside the bandpass. The resonators are connected in a ladder configuration between a first signal transmission path and a ground. The planar filter includes a strip line formed on a dielectric layer to define a second signal transmission path. The BAW filter and the planar filter are formed on a common substrate with the first and second transmission paths connected to each other. The BAW filter, in combination with the patterned planar filter added with the stub, can improve a deep near-band rejection inherent to the BAW filter, exhibiting an excellent out-of-band rejection over certain adjacent frequency ranges outside of the bandpass, and therefore give a sharp and wide bandpass. |
申请公布号 |
EP2122743(B1) |
申请公布日期 |
2012.11.28 |
申请号 |
EP20080711892 |
申请日期 |
2008.02.19 |
申请人 |
PANASONIC CORPORATION |
发明人 |
SUWA, ATSUSHI;SASABE, KOJI;NISHIMURA, FUTOSHI;HAYASAKI, YOSHIKI;MATSUSHIMA, TOMOAKI;XIONG, SIBEI;YOSHIHARA, TAKAAKI;YAMAUCHI, NORIHIRO;SHIRAI, TAKEO |
分类号 |
H01P1/203;H01L41/09;H01L41/18;H01L41/187;H01L41/22;H01L41/319;H03H3/02;H03H7/075;H03H9/17;H03H9/46;H03H9/54 |
主分类号 |
H01P1/203 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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