Antenna device including helical antenna
US8605002B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 28, 2011 |
| Grant date | Dec 10, 2013 |
| Priority date | — |
| Expiry date | Jul 28, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q11/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In an antenna device, a first helical part of a first antenna and a second helical part of a second antenna is disposed in a dielectric body on a ground plane. Each helical part is helically wound up in a direction perpendicular to the ground plane and includes a plurality of one-turn portions. Each one-turn portion of the first helical part has a peripheral length of M times a wavelength λ of use, where M is a positive natural number. One of the one-turn portions of the second helical part closest to the ground plane has a peripheral length Ks that is N times the wavelength λ of use, where N is a positive natural number greater than M. One of the one-turn portions of the second helical part farthest away from the ground plane has a peripheral length Ke, and (M·λ)<Ke<Ks(=N·λ).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.