发明授权
- 专利标题: Dielectric filter including at least one band elimination filter
- 专利标题(中): 介质滤波器,包括至少一个带状滤波器
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申请号: US469443申请日: 1995-06-06
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公开(公告)号: US5712604A公开(公告)日: 1998-01-27
- 发明人: Hitoshi Tada , Hideyuki Kato , Haruo Matsumoto , Tatsuya Tsujiguchi
- 申请人: Hitoshi Tada , Hideyuki Kato , Haruo Matsumoto , Tatsuya Tsujiguchi
- 申请人地址: JPX
- 专利权人: Murata Manufacturing Co., Ltd.
- 当前专利权人: Murata Manufacturing Co., Ltd.
- 当前专利权人地址: JPX
- 优先权: JPX6-231829 19940927; JPX6-231830 19940927
- 主分类号: H01P1/205
- IPC分类号: H01P1/205 ; H01P1/20
摘要:
A single-stage dielectric band elimination filter has a dielectric block with its outer surfaces mostly covered by an outer conductor and two mutually coupled resonant lines formed therein. Each resonant line has an open end insulated from the outer conductor and a shorted end connected thereto, the open and shorted ends of the two resonant lines being oppositely oriented. A multi-stage dielectric filter has a plurality of such single-stage band elimination filters formed inside a dielectric block, each mutually adjacent pair of the single-stage band elimination filters being interdigitally coupled or combline-coupled to each other with phase shift of II/2 therebetween. The open end of a resonant line may be formed at one of the end surfaces of the dielectric block, being connected to an electrode insulated from the outer conductor, or at an annular conductor-free area formed on the inner surface of the corresponding throughhole. The resonant lines for forming the plurality of single-stage band elimination filters may be arranged horizontally or vertically with respect to each other. Screening electrodes may be inserted between mutually adjacent resonant lines.
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