Confined Linear Jamming Device for Radio Containment
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Solution Overview
Problem
Existing jamming systems for illicit radio communications in enclosed spaces are inefficient due to geometric losses, requiring high power, are difficult to install and maintain, and often expensive, with inadequate containment and coverage.
Innovation Solution
A linear aerial system with scrambling devices and effectors that inject interference signals into a linear cable, ensuring the power ratio of the jamming signal to the usable signal is below the prohibited device's operating threshold, using a cylindrical radiation regime to achieve reliable and controlled interference coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional radio antennas are used for jamming, then coverage area can be extended, but geometric losses increase and containment effectiveness decreases
Solution Approach 1:
The patent transitions from conventional omnidirectional antennas (3D spherical radiation) to linear cables with distributed orifices (1D linear radiation). This dimensional change creates cylindrical wavefronts instead of spherical ones, fundamentally altering the geometric loss characteristics from 20.log10(R) to a more favorable pattern that maintains containment while extending coverage along the cable axis.
Solution Approach 2:
The linear cable is divided into multiple segments with distributed orifices along its length. Each orifice acts as an independent radiation point, collectively forming a continuous linear radiation source. This segmentation allows the jamming signal to be distributed uniformly along the cable, improving coverage while maintaining directional containment and reducing energy waste.
2Area of stationary object
If conventional antennas are used for jamming, then coverage can be expanded, but containment effectiveness deteriorates and external users are affected
Solution Approach 1:
The linear cable provides different radiation characteristics at different locations. The distributed orifices create a radiation pattern that is strong along the cable axis (providing coverage) but naturally attenuated in perpendicular directions (providing containment). This local variation in radiation quality allows simultaneous achievement of coverage and containment without affecting external users.
3Area of stationary object
If conventional antennas are used for jamming, then coverage can be improved, but installation and maintenance complexity increases and cost rises
Solution Approach 1:
The patent combines the antenna function with a simple linear cable structure. Instead of requiring multiple complex antenna elements, power amplifiers, and phase controllers, the system merges the radiation function into the cable itself through distributed orifices. This simplification dramatically reduces installation and maintenance complexity while maintaining effective coverage area.
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 prevents unauthorized radio communications within a specified area without affecting external users, providing flexible and cost-effective installation and maintenance, with precise containment and coverage.
Implementation Method 1
at least one linear cable comprising several orifices Oi allowing interference signals to be radiated
Data Source
Figure 1
Figure 2~4
Figure 3a~3b
AI summary
A confined jamming device and method arranged in a coverage area in which may be found prohibited radio communication devices the operation of which it is sought to be prevented, characterized in that said device comprises at least the following elements: • at least one linear element (1) comprising a plurality of openings Oi enabling interference signals to be radiated, the linear aerial being connected to one or more effectors via a connector (3), · said generating effector element or elements (2) being suitable for injecting one or a plurality of interference signals at at least one end of the linear aerial (1), the power flux Ρj,f of the interference signal Jj,f in the band Bj,f of a carrier f is selected such that the ratio PSj,f/PJ,f, between the power flux PSj,f of the signal Sj,f potentially usable by the prohibited device on the carrier f and the power flux PJ,f, of the signal Jf present on the carrier f for preventing operation of the prohibited device are less than an operating threshold SeuilSj,t of the prohibited device.