Radiating Coaxial Cable Aperture Array Spacing
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Solution Overview
Problem
Wide band radiating coaxial cables face significant field fluctuations due to interference from secondary modes, leading to deteriorated performance beyond a certain frequency band, and existing solutions either compromise mechanical strength or are difficult to produce effectively.
Innovation Solution
A radiating coaxial cable design featuring an array of apertures with a constant spacing that adjusts θ1 to vary between 150° and 180°, optimizing aperture length and spacing to minimize coupling loss and field strength fluctuations across a wide frequency band, thereby reducing secondary mode interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aperture groups are spaced at constant intervals to enable radiated mode operation, then radio coverage is improved, but field strength fluctuations increase due to secondary mode interference
Solution Approach 1:
The patent changes the spacing parameter s between aperture groups to be greater than the wavelength λ of the radiated signal. This parameter change shifts the operating mode from coupled mode to radiated mode, enabling omnidirectional radio coverage while the specific spacing relationship (s > λ) controls the radiation pattern to reduce field strength fluctuations caused by secondary modes.
2Stability of the object's composition
If aperture spacing is increased to reduce secondary mode interference, then field stability improves, but coupling loss increases
Solution Approach 1:
The patent optimizes the aperture group spacing parameter s to satisfy the relationship s > λ (where λ is the wavelength). This specific parameter range achieves an optimal balance: it is large enough to suppress secondary mode interference and stabilize field strength, yet not so large as to cause excessive coupling loss, thereby maintaining efficient energy transfer.
3Loss of energy
If the cable operates in coupled mode with closely-spaced apertures, then coupling loss is reduced, but radio coverage and radiation capability deteriorate
Solution Approach 1:
The patent transitions the cable from coupled mode to radiated mode by changing the aperture spacing parameter s to be greater than the wavelength λ. This fundamental parameter change enables the cable to radiate electromagnetic energy effectively in all directions (omnidirectional coverage) while maintaining acceptable coupling loss through optimized aperture design within each group.
Solution Approach 2:
The patent changes the radiation pattern from directional (in coupled mode) to omnidirectional (in radiated mode) by adjusting the aperture spacing. This dimensional change in radiation pattern enables three-dimensional radio coverage in all directions perpendicular to the cable axis, significantly improving radio coverage reliability.
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 achieves low coupling loss and reduced field strength variations over a frequency band of about one octave, enhancing digital communication reliability and minimizing distortions in analogue communications, while maintaining mechanical strength and ease of production.
Implementation Method 1
The outer conductor includes apertures which generate an electromagnetic radiation
Data Source
AI summary
A radiated mode coaxial cable comprising an outer conductor provided with a periodic aperture array, comprising a plurality (n) of apertures or aperture sets, repeated along the length of said outer conductor whereas a constant spacing s separates the left end of the first aperture of one array and the left end of the first aperture of a next array, wherein each array comprises at least 10 apertures or aperture sets, whereas the global length L (in mm) of the apertures or aperture sets is larger than (10D/n)1/2 where D is the diameter of the cable (in mm) and whereas the aperture spacing (d) in between two successive apertures or aperture sets is larger than 1.5w where w is the aperture width in the cable axis direction, and wherein the spacing s between two successive aperture arrays is selected so that λopt.1/(√εr−0,866)<s<λopt.2/(√εr−1), where λopt.1 and λopt.2 are respectively the upper and lower limits of the optimal wavelength range the radiated mode coaxial cable is designed for and where εr represents the relative dielectric constant of the radiating cable.