Radiating Cable Angular Apertures Reduce Longitudinal Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional radiating cables experience high longitudinal loss and limited bandwidth at high frequencies, requiring active components and increasing costs, which restricts their application in communication systems.
Innovation Solution
The radiating cable features angular apertures in its outer conductor with acute or obtuse angles, reducing longitudinal loss and preventing stop bands, allowing for single polarization and broadband characteristics, enabling longer cable lengths with fewer active components and supporting multiple wireless services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional radiating cables use rectangular or elliptical slots in the outer conductor, then the cable can radiate electromagnetic energy, but the longitudinal loss becomes relatively high at high frequencies (1.7-2.2 GHz)
Solution Approach 1:
The patent changes the geometric parameters of the apertures from conventional rectangular or elliptical shapes to angular shapes with specific apex angles (60°-120°). This parameter change in aperture geometry fundamentally alters the radiation characteristics, reducing longitudinal loss by minimizing longitudinal current disruption while maintaining effective electromagnetic energy coupling to the exterior.
Solution Approach 2:
The patent employs asymmetric angular aperture shapes with apexes pointing in the longitudinal direction, rather than symmetric rectangular or elliptical slots. This asymmetric geometry creates favorable current distribution patterns that reduce longitudinal loss at high frequencies while expanding the usable frequency bandwidth by eliminating stop bands.
2Adaptability or versatility
If slots are aligned with the cable axis to facilitate radiation, then radiation is enabled, but stop bands appear at high frequencies limiting bandwidth
Solution Approach 1:
The angular apertures are oriented with their apexes pointing in the longitudinal direction, creating an asymmetric configuration that prevents the formation of stop bands. This asymmetric geometry allows continuous signal transmission across a broad frequency range including high frequencies (1.7-2.2 GHz and beyond), eliminating the bandwidth limitations imposed by conventional aligned slot configurations.
Solution Approach 2:
By changing the aperture shape parameter from rectangular/elliptical to angular with specific apex angles (60°-120°), the patent fundamentally alters the electromagnetic interaction characteristics. This parameter change eliminates resonant conditions that create stop bands, thereby expanding bandwidth while maintaining transmission stability through the modified aperture geometry.
3Loss of energy
If radiating cable has high longitudinal loss, then active components like bidirectional amplifiers are required, but system cost increases
Solution Approach 1:
The patent changes the aperture geometry parameter to angular shapes with apexes pointing longitudinally, which fundamentally reduces longitudinal loss by minimizing disruption to longitudinal current flow. This parameter change enables passive signal transmission over longer distances without requiring bidirectional amplifiers or other active components, thereby reducing system complexity and cost.
4Adaptability or versatility
If conventional apertures are used, then radiation is achieved, but frequency bandwidth is limited due to resonance at small frequencies
Solution Approach 1:
The patent changes the aperture shape from conventional rectangular or elliptical geometries to angular shapes with specific apex angles (60°-120°) and controlled dimensions. This parameter change shifts the resonant frequencies away from the operational band and enables efficient radiation across a broad frequency spectrum including high frequencies, while maintaining effective power coupling to the exterior.
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 solution minimizes longitudinal loss, reduces the need for active components, and enhances bandwidth, enabling cost-effective and reliable communication systems capable of transmitting multiple wireless services over the same infrastructure, particularly optimized for high-frequency applications.
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
a coaxial cable comprising an inner conductor, which defines the longitudinal axis of the cable, an outer conductor surrounding the inner conductor, a dielectric sheath lying between the inner and outer conductors
Data Source
Figure 1a~1c
Figure 2a~2c
Figure 3
AI summary
The present invention relates to radiating high frequency lines. A radiating high frequency line is formed by a cable or a waveguide capable of radiating to the outside a portion of the electromagnetic energy which it transmits. In particular, the present invention relates to a radiating cable (1) having apertures (2) for generating electromagnetic (EM) fields outside of the cable (1) and a communication system comprising such radiating cable (1). The apertures (2) of the radiating cable (1) have two sides enclosing angle (α).