Subsurface antenna system
US4687445A · kind A · utility
19Cited by
2References
27Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 20, 1981 |
| Grant date | Aug 18, 1987 |
| Priority date | — |
| Expiry date | Feb 20, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q25/00
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A subsurface antenna system including at least one pair of radiating elements and feed system is buried within a subsurface medium. The radiating elements comprising the system are spaced apart at least one quarter free space wavelength at an operating frequency. The radiating elements are spaced from each other and the feed system provides appropriate relative phase to signals at the elements to produce from the antenna system a directional antenna pattern in free space.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.