Radiating Cable Aperture Angles for Vertical Polarization
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Solution Overview
Problem
Conventional radiating cables struggle to achieve a high degree of vertically polarized electromagnetic radiation, which is essential for effective communication in confined areas like tunnels and mines, where signal attenuation is significant.
Innovation Solution
The radiating cable design features apertures with angled slot-shaped legs, varying shapes such as rectangular, trapezoidal, and triangular, and serrated edges, along with strategically arranged groups of apertures to enhance vertical polarization and reduce reflections, thereby increasing the bandwidth and efficiency of electromagnetic radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional radiating cables use regularly spaced apertures or slots in the outer conductor, then electromagnetic radiation is enabled, but the degree of vertically polarized electromagnetic radiation is insufficient
Solution Approach 1:
The patent applies asymmetry by configuring aperture legs at specific angles (0° to 180°) relative to the longitudinal axis, with at least one leg forming a non-zero angle. This asymmetric angular arrangement creates dominant vertical polarization by controlling the current distribution and radiation pattern, transforming the conventional symmetric slot geometry into an asymmetric structure that preferentially radiates vertically polarized waves.
Solution Approach 2:
The patent employs parameter changes by varying the angular orientation of aperture legs, their lengths, and spacing along the cable. By adjusting these geometric parameters—specifically the angles between legs and the longitudinal axis, and the relative dimensions of legs—the radiation characteristics are optimized to achieve high vertical polarization without requiring complex additional structures.
2Loss of energy
If apertures with angled legs are used to achieve vertical polarization, then vertically polarized radiation is improved, but manufacturing complexity increases
Solution Approach 1:
The patent maintains ease of manufacture by using parameter changes within standard manufacturing capabilities. The aperture legs are formed with angles between 0° and 180° using conventional techniques such as laser drilling, waterjet cutting, or mechanical punching. The leg dimensions and angles are specified within ranges that can be achieved by standard industrial processes, avoiding the need for specialized or overly complex fabrication methods.
3Productivity
If multiple apertures are arranged along the cable to increase radiation, then bandwidth is improved, but reflections increase due to impedance discontinuities
Solution Approach 1:
The patent applies local quality by varying the aperture characteristics at different positions along the cable. The angular orientation, leg dimensions, and spacing of apertures are locally adjusted to maintain impedance continuity. This gradual variation in local aperture properties smooths the impedance transition along the cable, reducing reflections while enabling broadband operation through distributed radiation.
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
This design achieves dominant vertical polarization, reducing coupling losses and increasing the operational bandwidth, leading to more efficient data transfer and reduced need for repeaters, thus improving communication efficiency in challenging environments.
Implementation Method 1
By virtue of the apertures formed in the outer conductor, a portion of the power flowing in the cable and transmitted from a transmitting source is coupled to the exterior. The cable thus acts as an antenna and the power coupled to the exterior is called the radiated power.
Implementation Method 2
This ensures that a comparatively high degree of vertically polarized electromagnetic radiation is emitted by said radiating cable. Advantageously, with some embodiments, even a dominant vertical polarization may be achieved
Implementation Method 3
said first leg and/or said second leg comprises in a respective axial end section a tip section with a width changing along the longitudinal axis of said cable, wherein said tip section preferably comprises a basically triangular shape. This ensures a smooth transition of the impedance of the radiating cable in the region of the tip section along the longitudinal axis and thus contributes to reduce reflections within said radiating cable
Implementation Method 4
said first leg and/or said second leg comprises at least one edge with a serrated and/or meandering shape. According to Applicant's analysis, this leads to an increased phase difference between currents flowing within different edges of said aperture thus contributing to a further increased portion of vertically polarized radiation
Data Source
Figure 1a
Figure 1b
Figure 2
AI summary
Radiating cable (10) for radiating electromagnetic energy, comprising an outer conductor (12) surrounding a longitudinal axis (14) of the cable (10), wherein the outer conductor (12) has a plurality of apertures (120), wherein at least one aperture (120) comprises a first basically slot-shaped leg (122) and a second basically slot-shaped leg (124), wherein a longitudinal axis (1220) of said first leg (122) is parallel to the longitudinal axis (14) of said cable (10), and wherein a first angle (alpha) between a longitudinal axis (1240) of said second leg (124) and said longitudinal axis (14) of said cable (10) comprises a value larger than 0 degrees and smaller than 180 degrees.