发明名称 |
Method of manufacturing a filter by forming strip lines on a substrate and dividing the substrate |
摘要 |
The present invention relates to a filter employed in a radio communication apparatus and has as an object to prevent characteristics of the filter from degradation by increasing unloaded Q of strip line resonators of the filter. For achieving the above object, the invention provides a filter which comprises a substrate (4) having first and second strip lines (5), (6) formed on a top surface and mutually coupled through an electromagnetic field and an earth pattern (2) on a bottom surface, respectively, a dielectric layer (8) laminated on the top surface of the substrate and having capacitor patterns (9), (10) formed on a top surface thereof in opposition to the aforementioned first and second strip lines (5), (6), and a metal cap (1) fitted over the dielectric layer (8) having an electrically conductive surface at least on one of top and bottom surfaces, and an electrically conductive film formed on a portion of an outer peripheral surface of the aforementioned substrate (4) and connected to the earth pattern (2) on the bottom surface thereof, wherein at least a portion of an outer periphery of the metal cap (1) in led downwardly toward the electrically conductive film, and the portion led downwardly is connected to the electrically conductive film.
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申请公布号 |
US5832578(A) |
申请公布日期 |
1998.11.10 |
申请号 |
US19950561860 |
申请日期 |
1995.11.22 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
YUDA, NAOKI;TAKAHASHI, HIROSHI;ISHIKAWA, TAKAYOSHI;HIMORI, THUYOSHI;IEDA, TOMOAKI |
分类号 |
H01P1/203;(IPC1-7):H04R17/00 |
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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