High frequency filter
US7432786B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2007 |
| Grant date | Oct 7, 2008 |
| Priority date | — |
| Expiry date | May 31, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/20345
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A high frequency filter incorporates first to third resonators provided inside a layered substrate. The first and third resonators are adjacent to each other and inductively coupled to each other. The second and third resonators are also adjacent to each other and inductively coupled to each other. The first and second resonators are not adjacent to each other but are capacitively coupled to each other through a conductor layer for capacitive coupling. The conductor layer for capacitive coupling incorporates: a first portion for forming a first capacitor between itself and the first resonator; a second portion for forming a second capacitor between itself and the second resonator; and a third portion having an end connected to the first portion and the other end connected to the second portion, the ends being opposed to each other in the longitudinal direction. The width of at least part of the third portion is smaller than the width of each of the first portion and the second portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.