Racetrack Pulsed Ion Current Antenna for Compact LF Data Transmission
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Solution Overview
Problem
Current low-frequency radio communication technologies, such as VLF and LF transmitters, face limitations in achieving high bandwidth and data transfer rates due to their large size and inefficient modulation techniques.
Innovation Solution
A pulsed ion current antenna with a racetrack configuration under vacuum, where ions are injected, merged, and modulated to produce a high-power electric dipole antenna, enabling efficient data transfer through advanced modulation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional VLF and LF transmitters are used, then radio communication in the VLF and LF bands can be achieved, but the transmitter size becomes very large (substantially equal to or larger than the wavelength of the carrier wave)
Solution Approach 1:
The patent employs periodic pulsed ion injection into the racetrack configuration, where ions are injected in cycles and accumulate over multiple passes. The ion beam is pulsed at specific frequencies (e.g., 20 kHz) rather than continuous, allowing current aggregation while maintaining compact dimensions. This periodic action enables the small transmitter to achieve high current levels that would otherwise require much larger structures.
Solution Approach 2:
The racetrack configuration nests multiple functional zones (injection zone, merging zone, bending zones, return zone) within a compact closed-loop structure. The ion beam traverses this nested path multiple times, accumulating current with each cycle. The entire racetrack structure fits within a volume much smaller than the carrier wavelength, yet achieves high current through the nested, multi-pass ion circulation.
2Productivity
If current low-frequency transmitter technologies are used, then radio communication can be maintained, but bandwidth is limited and data transfer rates are low
Solution Approach 1:
The patent implements dynamic modulation by varying the ion beam parameters (current, frequency, pulse width) in real-time to encode data. The system can dynamically adjust the beam characteristics to achieve different modulation schemes, enabling high data transfer rates. The racetrack configuration allows rapid modulation response because the ion beam circulates quickly and can be controlled at each injection point.
Solution Approach 2:
The system achieves high bandwidth (about 5 kHz) by changing multiple parameters of the ion beam including pulse frequency, current amplitude, and duty cycle. These parameter changes enable advanced modulation techniques that can encode up to 100 times more data than traditional methods. The ability to rapidly vary these parameters is what enables the high productivity despite the inherent limitations of low-frequency operation.
3Power
If ion beam current is accumulated in a toroidal configuration, then output radiation power is improved, but beam plasma instability spreads the beam arc and reduces beam speed
Solution Approach 1:
The patent replaces the traditional toroidal magnetic confinement with a racetrack configuration using magnetic bottles and bending magnets. This substitution allows for more precise control of the ion beam trajectory and velocity. The magnetic bottles at the ends of the racetrack reflect ions back without the same instability issues as toroidal confinement, maintaining beam speed while still achieving current accumulation through the closed-loop path.
Solution Approach 2:
The racetrack is segmented into distinct functional zones (injection zone with magnetic bottle, merging zone, bending zones with magnets, return zone). This segmentation allows independent optimization of each zone to maintain beam quality. The bending zones use dedicated magnets to control trajectory, while the merging zone is optimized for current accumulation, preventing the beam spreading that occurs in unified toroidal configurations.
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 pulsed ion current antenna achieves a high bandwidth of about 5 kilohertz, allowing for up to 100 times more data transfer than traditional technologies, while maintaining a compact size significantly smaller than the wavelength of the carrier wave.
Implementation Method 1
Two parallel magnet plates are provided in each of the first and second beam bending zones, configured to produce a respective magnetic field that bends a path of travel of an ion beam within the enclosed racetrack
Implementation Method 2
A plurality of loop coils are configured to generate magnetic fields in one or more of the ion injection zone, the beam merging zone, and the beam return zone, to shape travel of ions within the enclosed racetrack
Implementation Method 3
a novel transmitter configuration in which a pulsed ion beam current is aggregated cyclically
Implementation Method 4
The ion beam pulse within the enclosed racetrack is modulated to cause the ion beam pulse to produce a radiating electromagnetic wave with signal-carrying data
Data Source
AI summary
A pulsed ion current antenna includes an enclosed racetrack having an interior configured to be placed under vacuum. The enclosed racetrack has an ion injection zone, a beam merging zone, a first beam bending zone, a beam return zone, and a second beam bending zone. An ion source is provided at an end of the ion injection zone. Two parallel magnet plates are provided in each of the first and second beam bending zones, configured to produce a respective magnetic field that bends a path of travel of an ion beam within the enclosed racetrack. A plurality of loop coils are configured to generate magnetic fields to shape travel of ions within the enclosed racetrack such that ions from the ion source that are injected through the ion injection zone are merged in the beam merging zone into an ion beam within the enclosed racetrack.