Antenna system with a limitable communication area
US5337066A · kind A · utility
19Cited by
2References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1992 |
| Grant date | Aug 9, 1994 |
| Priority date | — |
| Expiry date | Sep 14, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q3/12
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna system, comprising an antenna for transmitting a radio wave of a frequency, and a radio wave absorber intercepting and absorbing part of the radio wave to reduce the gain of the antenna. Thereby, the antenna system narrows down the communication area of the radio wave independently of the frequency. The antenna system is applicable to a movable object discriminator using a radio wave.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.