Filter and radio communication device using the same
US7397330B2 · kind B2 · utility
2Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2006 |
| Grant date | Jul 8, 2008 |
| Priority date | — |
| Expiry date | Oct 31, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/20381
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A filter includes a resonant unit which has a plurality of resonators respectively formed of each microstrip line and connected in cascade with one another, and a coupling unit which has at least one inter-resonator coupling of the resonant unit in an area within a range of ±45° (⅛-wavelength) in an electrical length from a voltage maximum point at a intermediate of the microstrip line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.