Leaky Coaxial Cable Slot Layout for Multi-Directional Radiation
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Solution Overview
Problem
Conventional leaky coaxial cables have directional radiation patterns, which limit their application in scenarios requiring multi-directional or omni-directional radiation, such as 5G indoor coverage and industrial IoT, where diverse frequency bands and radiation patterns are needed.
Innovation Solution
A multi-directional radiation leaky coaxial cable design featuring at least two rows of slotted hole groups distributed at different angles on the outer conductor, with a phase difference of 180° between adjacent rows, allowing for increased radiation lobes and independent excitation sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional leaky cable with single-directional radiation is used, then the structure is simple and easy to manufacture, but the radiation directionality limits its applicability in scenarios requiring multi-directional or omni-directional radiation
Solution Approach 1:
The outer conductor is divided into multiple rows of slotted hole groups, with each row radiating in a specific direction. This segmentation allows the cable to achieve multi-directional radiation by combining multiple directional radiation elements, resolving the contradiction between radiation adaptability and structural complexity.
Solution Approach 2:
The slotted holes are arranged asymmetrically at different angular positions around the outer conductor circumference. This asymmetric distribution creates multiple radiation lobes in different directions, enabling the cable to provide omni-directional or multi-directional radiation coverage while maintaining a relatively simple coaxial cable structure.
2Adaptability or versatility
If multiple rows of slotted hole groups are added to achieve multi-directional radiation, then radiation adaptability improves, but the cable structure becomes more complex
Solution Approach 1:
The multi-row slotted hole group structure serves multiple functions simultaneously: it provides multi-directional radiation, creates independent excitation sources with 180° phase difference, and maintains a compact coaxial cable form factor. This multi-functionality approach allows the enhanced structure to justify its increased complexity by delivering multiple performance benefits.
Solution Approach 2:
The slotted holes are distributed in the circumferential dimension around the outer conductor, transitioning from a single-direction (one-dimensional) radiation pattern to multi-directional (two-dimensional) radiation. This dimensional expansion enables omni-directional coverage while keeping the axial structure compact and manageable.
3Adaptability or versatility
If slotted holes are arranged to create multiple radiation lobes, then radiation coverage improves, but manufacturing precision requirements increase
Solution Approach 1:
Each row of slotted hole groups has a specific local quality with optimized slot orientation and positioning for its designated radiation direction. This localized optimization allows each segment to contribute effectively to the overall multi-directional radiation pattern, making the manufacturing process more manageable by breaking down the complex positioning requirement into repeatable local patterns.
Solution Approach 2:
The slotted hole groups are arranged periodically around the outer conductor circumference with regular angular spacing. This periodic arrangement simplifies manufacturing by allowing the use of standardized jigs and fixtures that can reproduce the same slot patterns at different angular positions, reducing the overall manufacturing precision burden compared to irregular arrangements.
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 design achieves multi-directional radiation patterns, increasing the number of radiation directions and enhancing the cable's applicability in diverse scenarios by ensuring independent and non-interfering excitation sources.
Implementation Method 1
The outer conductor is provided with at least two rows of slotted hole groups, the at least two rows of slotted hole groups are distributed at different angles in a circumferential direction of the outer conductor, each row of slotted hole group includes a plurality of slotted hole arrays which are periodically arranged along an axial direction of the outer conductor
Data Source
AI summary
A multi-directional radiation leaky coaxial cable, including an inner conductor, an insulating layer, an outer conductor and a sheath which are sequentially and coaxially nested from inside to outside. The outer conductor is provided with at least two rows of slotted hole groups, the at least two rows of slotted hole groups are distributed at different angles in a circumferential direction of the outer conductor, and each row of slotted hole group includes a plurality of slotted hole arrays which are periodically arranged along an axial direction of the outer conductor. Each slotted hole array includes a plurality of slotted holes, pitches of the slotted hole groups are the same, and a periodic arrangement difference of two adjacent rows of slotted hole groups in the circumferential direction is half a pitch, such that a phase difference of respective excitation electric fields is 180°.