ULF Dipole Antenna With Plasma Shielded Return Conductor
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Solution Overview
Problem
Existing digital communication technologies are inadequate for underground and undersea applications due to limitations in signal transmission at ultra-low frequencies, particularly in generating and maintaining stable magnetic flux densities over long distances.
Innovation Solution
A compact digital communication device utilizing a mechanical rotary disc switch or electronic components to generate AC signals at 1 to 10 kHz, with a motor-controlled PWM technique for frequency modulation, and a collisionless plasma shield to enhance signal radiation, achieving a magnetic flux density of 100 fT at distances up to 10 km.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing digital communication technologies are used, then communication capability is provided, but signal transmission at ultra-low frequencies is inadequate and stable magnetic flux density cannot be maintained over long distances
Solution Approach 1:
The patent changes the operating frequency parameter to ultra-low frequencies (1-10 kHz) and modifies the signal generation mechanism to produce stable magnetic flux density at these frequencies, enabling reliable communication where existing technologies fail
2Adaptability or versatility
If a mechanical rotary disc switch is used to generate AC signals, then frequency modulation capability is achieved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical rotary disc switch with an electronic frequency modulation system that uses a microcontroller to generate FM signals, eliminating mechanical moving parts while maintaining frequency modulation capability for ultra-low frequency communication
3Reliability
If collisionless plasma is used to enhance signal radiation, then magnetic flux density is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses collisionless plasma as a temporary, easily generated medium to enhance signal radiation during operation, rather than requiring permanent complex manufacturing structures. The plasma is generated on-demand and provides the necessary shielding effect without permanent installation complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively transmits data through frequency modulation, achieving a maximum data rate of 50 bits per second with minimal power consumption and scalable design, suitable for underground and undersea environments.
Implementation Method 1
The rotary switch is rotated by a motor that operates at a variable speed controlled by a pulse width modulation (PWM) technique
Implementation Method 2
generate an AC signal, preferably at a frequency of 1 to 10 kHz AC, with a peak current of 2 to 200 A, radiated from an antenna
Implementation Method 3
A second embodiment utilizes a collisionless plasma shield
Data Source
AI summary
An ultra-low or very low frequency communication device composed of: a circuit unit operative to produce an alternating current; and a dipole antenna connected to receive the alternating current and to convert the alternating current into electromagnetic radiation. The antenna is composed of an unshielded radiating conductor and a shielded return conductor connected in series with the radiating conductor, and the return conductor is shielded by a Faraday shield such as a collisionless plasma column that surrounds the return conductor to prevent any electromagnetic radiation from the return conductor.