Low-profile loop antenna
US9748642B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 2015 |
| Grant date | Aug 29, 2017 |
| Priority date | — |
| Expiry date | May 26, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/0442
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A low-profile loop antenna includes a driven element disposed very close, in some cases within about 0.005 wavelengths (λ) or closer, to a ground plane, while maintaining sizable gain and usable feed point impedance. Width of the driven element varies along its circumference, such that two diametrically opposed portions of the driven element are wider, and therefore have lower impedance, than other diametrically opposed portions of the driven element. The antenna may be configured to achieve a desired feed point impedance. The antenna may be tuned over a wide bandwidth. Metallic objects placed near the center of the antenna loop do not significantly degrade performance of the antenna. A parasitic element may be added to create a circularly-polarized antenna, without significantly increasing the antenna's profile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.