Antenna for reducing an effect of a radio wave blocking obstacle
US5952981A · kind A · utility
1Cited by
7References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 8, 1996 |
| Grant date | Sep 14, 1999 |
| Priority date | — |
| Expiry date | Aug 8, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An array antenna is located on an upper surface of a vehicle. The array antenna is oriented at a right angle to a radio wave blocking obstacle existing in a radio wave transmission path. A diffracted wave is effectively received at the shadowed portion where a direct wave is not transmitted because of the radio wave blocking obstacle. If the antenna dimension of its longitudinal direction is larger than that of the radio wave blocking obstacle, both direct wave and diffracted wave are received and therefore the reception power decrease caused by the radio wave blocking obstacle is further reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.