Patent · US Expired

Double spiral antenna

US7646356B2 · kind B2 · utility

21Cited by

6References

16Claims

0Family size

Assignee

Siemens Audiologische Technik GmbH · DE

Inventors

Hans Adel · Stein, DE
Rainer Wansch · Geiselhöring, DE
Josef Bernhard · Nabburg, DE
Thomas Fischer · Umkirch, DE

Key dates

Filing date	Feb 14, 2006
Grant date	Jan 12, 2010
Priority date	—
Expiry date	Mar 26, 2026

Classification

Technology area (CPC H)Electricity
CPC primaryH04R2225/51
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

An antenna comprises a first antenna element, which has a first helix, and a second antenna element, which has a second helix. The first and the second antenna elements each have a feed point at an outer end of the corresponding helix and an open end at an inner end of the corresponding helix. A symmetrical helix antenna according to the invention can be integrated in a comparatively simple manner in an existing system, for example in a hearing aid. By integrating the antenna in a plastic housing, the antenna cannot be seen at all from the outside. The antenna is comparatively small in relation to conventional antennas.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.