Sub-surface communications system and method
US7796943B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 28, 2007 |
| Grant date | Sep 14, 2010 |
| Priority date | — |
| Expiry date | Feb 13, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B13/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communications system including: a plurality of sub-surface portable transceivers each including: a digital data source, a modulator coupled to the digital data source, a power amplifier coupled to the modulator and a loop antenna inductively coupled to the power amplifier; and a base transceiver including: an electrically insulated ferrite core antenna for receiving magnetic signals, an electric di-pole antenna for receiving ambient noise, a noise canceller coupled to the insulated ferrite core antenna and electric dipole antenna and responsive to the electric-dipole antenna to filter noise from signals received via the insulated ferrite core antenna, a demodulator coupled to the noise canceller and a decoder coupled to the demodulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.