Bandpass Shielded Cable for Array Antenna Radiation Paths
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Solution Overview
Problem
Coaxial cables used in array antennas shield electromagnetic radiation, leading to pattern deterioration and compromised communication quality, necessitating a solution to reduce cable shielding effects.
Innovation Solution
A cable design featuring spaced metal units on a metal layer, with dielectric units between them, to implement bandpass filtering and reduce electromagnetic wave shielding, allowing the cable to be placed on an antenna's radiation path without distorting the antenna pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coaxial cable is used in array antennas, then the cable provides signal transmission and shielding function, but the cable shields electromagnetic radiation from the antennas, causing pattern deterioration and affecting communication quality
Solution Approach 1:
The continuous metal shielding layer of the coaxial cable is segmented into periodically spaced metal units (such as metal rings or metal strips). This segmentation creates gaps that allow electromagnetic waves to pass through while the metal units still provide shielding for frequencies outside the passband, thus reducing the harmful shielding effect on antenna radiation patterns.
Solution Approach 2:
The cable structure is modified by introducing periodic variations in the shielding layer, creating different local properties: the metal units provide shielding in certain frequency ranges, while the gaps between them allow electromagnetic wave passage in the desired frequency band. This local quality variation enables the cable to simultaneously provide shielding and maintain antenna radiation patterns.
2Object-generated harmful factors
If the cable metal layer is made continuous to improve shielding performance, then electromagnetic wave shielding is enhanced, but the antenna radiation pattern becomes distorted
Solution Approach 1:
The continuous metal shielding layer is divided into periodically spaced metal units with specific dimensions and spacing. This segmentation creates a frequency-selective structure where the metal units shield certain frequencies while gaps allow other frequencies to pass, thereby maintaining the antenna radiation pattern shape while still providing necessary electromagnetic shielding.
3Shape
If the cable structure is modified to reduce shielding effects, then antenna pattern is preserved, but the cable's electromagnetic shielding capability is weakened
Solution Approach 1:
The cable shielding structure is designed with periodic variations where metal units provide localized shielding while gaps between them create passbands for electromagnetic waves. This local quality differentiation allows the cable to preserve antenna radiation patterns in the desired frequency range while maintaining shielding capability against unwanted frequencies, thus resolving the trade-off between pattern preservation and shielding effectiveness.
Solution Approach 2:
The dimensions, spacing, and material properties of the metal units are carefully optimized to create frequency-selective shielding characteristics. By adjusting parameters such as the width, thickness, and periodic spacing of metal units, the cable can be tuned to provide shielding in specific frequency bands while allowing transmission in the antenna operating frequency range, thus maintaining both radiation pattern integrity and shielding capability.
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 cable effectively reduces shielding of electromagnetic waves in specific frequency bands, preserving the antenna's radiation pattern and enhancing communication performance.
Implementation Method 1
A plurality of metal units are spacedly disposed, or disposed in a spaced-apart manner, on a metal layer of the cable. This can implement bandpass of an electromagnetic wave in a specific frequency band, thereby reducing cable's shielding on the electromagnetic wave in the specific frequency band.
Data Source
AI summary
A cable includes a first part and a second part. The first part includes a cable core, a metal layer, and a dielectric layer. The metal layer wraps the cable core, and the dielectric layer is sandwiched between the cable core and the metal layer. The second part includes a plurality of metal units and a dielectric unit. The plurality of metal units are spacedly disposed on the metal layer of the cable, to reduce cable's shielding on an electromagnetic wave in a specific frequency band. The cable is placed on a radiation path of an antenna. This can reduce shielding on an electromagnetic wave radiated by the antenna, to avoid distortion of an antenna pattern.