VLF TRANSMIT ANTENNA SYSTEM, METHOD AND APPARATUS

VLF TRANSMIT ANTENNA SYSTEM, METHOD AND APPARATUS

There is provided a Very Low Frequency (VLF) transmit antenna system, method, and apparatus for creating a magnetic field at low frequencies suitable for communications through the earth or other thick, solid barriers. At least two loop antennas are arranged such that a magnetic field of each one of...

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Hauptverfasser: PUZAKOV, VLADIMIR, ROPER, MICHAEL JAMES
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
ANTENNAS, i.e. RADIO AERIALS
BASIC ELECTRIC ELEMENTS
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
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creator PUZAKOV, VLADIMIR
ROPER, MICHAEL JAMES
description There is provided a Very Low Frequency (VLF) transmit antenna system, method, and apparatus for creating a magnetic field at low frequencies suitable for communications through the earth or other thick, solid barriers. At least two loop antennas are arranged such that a magnetic field of each one of the at least two loop antennas passes through each remaining one of the at least two loop antennas, thereby closely coupling the at least two loop antennas. A full bridge Pulse Width Modulated transmitter is directly connected to each loop antenna for driving the latter. When a loop of a given loop antenna is broken and its magnetic field collapses, the transmitters connected to the remaining loop antennas increase the current in the remaining loops to maintain a constant magnetic field.
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subjects ANTENNAS, i.e. RADIO AERIALS
BASIC ELECTRIC ELEMENTS
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
title VLF TRANSMIT ANTENNA SYSTEM, METHOD AND APPARATUS
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