Abstract: A wireless local area network magnetic communications system comprising a plurality of portable interdependent satellite magnetic transceivers each connected to a respective computer module enclosed in a chassis, wherein a base system containing a magnetic transceiver communicates with the satellite transceivers having associated antennas for transmitting and receiving magnetic signals via a wireless network protocol.

Abstract: A safe area voltage regulator is provided that includes a loss element, a distributed shunt regulator and an output terminal. The loss element component is directly connected to the distributed shunt regulator and includes a plurality of loss elements connected in series. The distributed shunt regulator is made up of a plurality of shunt regulators connected in parallel and is configured to regulate a peak voltage of a voltage signal to below a maximum voltage threshold. The output terminal is directly connected to the distributed shunt regulator and configured to output the voltage signal with the regulated peak voltage.

Abstract: A safe area voltage and current interface is provided that includes an antenna and mode selection unit, an antenna tuner unit and an interface unit. The antenna and mode selection unit determines a frequency mode and an antenna mode for an output signal. The antenna tuner unit is directly connected to the antenna and mode selection unit and is configured to tune the output signal based on the frequency mode and the antenna mode determined by the antenna and mode selection unit. The interface unit is directly connected to the antenna tuner unit and is configured to ensure that a current and voltage level of the output signal does not exceed an intrinsically safe current and voltage level, while maintaining the peak current level of the output signal to a level sufficient to drive an electronic component disposed in an unsafe environment.

Abstract: A safe area voltage and current interface is provided that includes an antenna and mode selection unit, an antenna tuner unit and an interface unit. The antenna and mode selection unit determines a frequency mode and an antenna mode for an output signal. The antenna tuner unit is directly connected to the antenna and mode selection unit and is configured to tune the output signal based on the frequency mode and the antenna mode determined by the antenna and mode selection unit. The interface unit is directly connected to the antenna tuner unit and is configured to ensure that a current and voltage level of the output signal does not exceed an intrinsically safe current and voltage level, while maintaining the peak current level of the output signal to a level sufficient to drive an electronic component disposed in an unsafe environment.

Abstract: A safe area voltage regulator is provided that includes a loss element, a distributed shunt regulator and an output terminal. The loss element component is directly connected to the distributed shunt regulator and includes a plurality of loss elements connected in series. The distributed shunt regulator is made up of a plurality of shunt regulators connected in parallel and is configured to regulate a peak voltage of a voltage signal to below a maximum voltage threshold. The output terminal is directly connected to the distributed shunt regulator and configured to output the voltage signal with the regulated peak voltage.

Abstract: The present invention relates to a magnetic transmit antenna apparatus comprising: a toroidal core transformer having a primary winding inductively coupled to a secondary winding supplying a low voltage and high current to a magnetic transmit antenna wherein the magnetic transmit antenna includes a wire loop having multiple turns for generating a magnetic field. The toroidal core transformer includes a primary winding that operates in association with the secondary winding to match the impedance of a signal source to the magnetic transmit antenna.

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.

Abstract: The present invention relates to a magnetic transmit antenna apparatus comprising: a toroidal core transformer having a primary winding inductively coupled to a secondary winding supplying a low voltage and high current to a magnetic transmit antenna wherein the magnetic transmit antenna includes a wire loop having multiple turns for generating a magnetic field. The toroidal core transformer includes a primary winding that operates in association with the secondary winding to match the impedance of a signal source to the magnetic transmit antenna.

Abstract: A wireless local area network magnetic communications system comprising a plurality of portable interdependent satellite magnetic transceivers each connected to a respective computer module enclosed in a chassis, wherein a base system containing a magnetic transceiver communicates with the satellite transceivers having associated antennas for transmitting and receiving magnetic signals via a wireless network protocol.

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.