RF Current-Sensing Antenna Using Magnetic Core for Compact Low-Frequency Radiation
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Solution Overview
Problem
Conventional antennas for low-frequency RF applications are large and difficult to mount, requiring significant resources due to their size and the need for extensive mounting hardware, making them costly and impractical for certain applications.
Innovation Solution
An RF current-sensing and current-injecting antenna system that utilizes a non-magnetic housing, a magnetic core with a central aperture, and a winding to couple RF energy to any conductor 0.1 wavelengths or longer, allowing for the use of existing conductive structures as antennas, thereby reducing size and mounting complexity while enabling stealth integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional antenna is used for low-frequency RF applications, then the antenna can properly develop radiated power, but the antenna becomes large and difficult to mount
Solution Approach 1:
The patent embeds a magnetic core with windings inside a non-magnetic housing that contains the conductor. The magnetic core is nested within the housing structure, and the conductor passes through the magnetic core, creating a compact nested arrangement that enables low-frequency operation without requiring a long external antenna structure
Solution Approach 2:
The magnetic core with windings acts as an intermediary device that couples RF energy to the conductor. Instead of directly requiring a long antenna for low-frequency operation, the magnetic coupling mechanism mediates the energy transfer, allowing a short conductor to function effectively at low frequencies
2Power
If a conventional antenna is used for low-frequency RF applications, then the antenna can properly develop radiated power, but extensive mounting hardware is required
Solution Approach 1:
The patent combines the antenna function with an existing conductor structure (such as a vehicle frame or mounting structure). The conductor that would normally require separate mounting hardware is itself utilized as the radiating element, merging the structural support function with the antenna function and eliminating the need for additional mounting hardware
Solution Approach 2:
The existing conductor structure serves dual purposes: it provides the mechanical support and positioning that would otherwise require mounting hardware, while simultaneously functioning as the antenna element for RF radiation. The structure serves itself by eliminating the need for separate mounting components
3Power
If a conventional antenna is used, then RF energy can be transmitted and received, but the antenna is visible and detectable
Solution Approach 1:
The patent utilizes existing structural conductors (such as vehicle frames, roof racks, or mounting structures) that serve multiple functions: structural support, positioning, and RF radiation. By making the antenna function universal to existing structures, the antenna becomes indistinguishable from the structure itself, providing stealth capability while maintaining RF functionality
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 system effectively couples and radiates RF energy over a wide frequency range (100 KHz to 3 GHz), optimizing performance and reducing visibility, making it suitable for stealth applications and signal intelligence systems.
Implementation Method 1
In the transmitting mode, the first winding functions as a primary winding and the conductor functions as a secondary winding
Implementation Method 2
a magnetic core having a central aperture, said core insulated from said housing, and a first winding wound about said core
Implementation Method 3
a conductor is positioned within said aperture, and said conductor has a length of at least 0.1 wavelength of said RF energy
Data Source
AI summary
An embodiment of an antenna system comprising a radio frequency (RF) current-sensing and current injecting antenna device for coupling RF energy, wherein the antenna device comprises an outer conducting non-magnetic housing, a magnetic core having a central aperture, said core insulated from said housing, and a first winding wound about said core, said first winding having a first end receiving said RF energy and a second end, said first winding insulated from said housing between said first end and said second end, wherein a conductor is positioned within said aperture, and said conductor has a length of at least 0.1 wavelength of said RF energy. Wherein, in a transmitting mode said antenna device couples RF energy, created in an RF transmitter, to the conductor. In a receiving mode said antenna device couples RF energy, developed in the conductor intercepting an RF field, to the input of an RF receiver. In the transmitting mode, the first winding functions as a primary winding and the conductor functions as a secondary winding. In the receiving mode, the first winding functions as a secondary winding and the conductor functions as a primary winding.