Filter circuit and laminate filter
US7109829B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2004 |
| Grant date | Sep 19, 2006 |
| Priority date | — |
| Expiry date | Jun 25, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/20345
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Under circumstances where communication devices such as mobile phones are required to be diversified, laminate filters are required to have attenuation-band characteristics which are steep on both low-frequency and high-frequency sides. The prior-art laminate filter has the problem that an attenuation band is formed only on the low-frequency side or on the high-frequency side. A laminate filter has stripline patterns that are first, second, and third resonant elements disposed on a dielectric layer, a capacitively coupled (C-coupled) pattern disposed between the first and second stripline patterns, an inductively coupled (M-coupled) pattern disposed between the second and third stripline patterns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.