Laminated dielectric filter, and antenna duplexer and communication equipment using the same
US6696903B1 · kind B1 · utility
16Cited by
6References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 2000 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Aug 4, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/2135
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A laminated dielectric filter is formed by coupling a plurality of resonators to one another by electromagnetic-field coupling. In the laminated dielectric filter, a bypass circuit formed of a series circuit including bypass capacitors and transmission lines is provided in parallel to a magnetic-field bypass coupling between non-adjacent resonators. Thus, capacitance of the bypass capacitors can be regulated without being affected by the magnetic-field bypass coupling between the non-adjacent resonators. As a result, attenuation poles outside a passband can be controlled freely.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.