Multiple loop antenna with crossover element having a pair of spaced, parallel conductors for electrically connecting the multiple loops
US5914692A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1997 |
| Grant date | Jun 22, 1999 |
| Priority date | — |
| Expiry date | Jan 14, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q7/00
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A multiple loop antenna is provided which may be connected to either a transmit circuit, a receive circuit, or a transmit/receive circuit. When powered by a transmit circuit, the antenna generates radio frequency magnetic fields in an area or zone proximate to the antenna, but which are substantially canceled at a distance approximately one wavelength and more from the antenna, thereby defining a surveillance zone proximate to the antenna. Radiating loop segments of the antenna are centered around a common feed point and are geometrically symmetrical, such that currents are precisely controlled in each loop segment. A crossover element electrically connects the loop segments. The crossover element includes a pair of spaced, parallel conductors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.