EMI-Resistant Antenna Cable Layout for Meter Radiation Efficiency
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Solution Overview
Problem
Antennas in electricity meters are susceptible to electro-magnetic interference (EMI), which can degrade their performance and lead to reduced efficiency in energy radiation, as traditional EMI-resistant materials like ferrite absorb heat and reduce energy transmission.
Innovation Solution
The antenna is designed with mechanically asymmetrical but electrically symmetrical portions, combined with a cable containing EMI-resistant elements such as ferrite, to optimize radiation efficiency while maintaining resistance to EMI, by tuning the impedance to the environment and balancing the antenna against board components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EMI resistant material such as ferrite is used to coat the cable, then the antenna's resistance to EMI is improved, but the antenna receives less energy and has degraded performance
Solution Approach 1:
The patent changes the physical parameters of the antenna system by introducing EMI resistant elements at specific positions along the cable and adjusting the cable length. These parameter changes allow the antenna to maintain EMI resistance while optimizing energy reception through careful selection of element positions and dimensions.
Solution Approach 2:
The patent applies EMI resistant material locally at specific positions along the cable rather than uniformly throughout. By placing ferrite elements at strategically determined positions, the antenna achieves EMI protection where most needed while minimizing the overall impact on energy reception and radiation efficiency.
2Reliability
If the length of the antenna feed cable is shortened, then the antenna's EMI resistance is improved, but the antenna's ability to radiate energy efficiently is reduced
Solution Approach 1:
The patent segments the feed cable into multiple sections with EMI resistant elements placed at specific positions along its length. This segmentation allows the cable to maintain adequate length for efficient radiation while providing distributed EMI protection at critical points along the cable path.
Solution Approach 2:
The EMI resistant elements act as intermediaries between the antenna and external electromagnetic interference. These elements provide protection against EMI while allowing the cable to maintain its optimal length for energy radiation, mediating between the conflicting requirements of EMI resistance and radiation efficiency.
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 approach enhances the antenna's resistance to EMI while maintaining efficient energy radiation, ensuring the antenna operates effectively despite potential interference, thereby improving the overall performance of the electricity meter.
Implementation Method 1
Ferrite or another suitable material can absorb heat and can help the antenna to resist the attack or to sustain less interruption to its normal operation
Data Source
AI summary
One embodiment is a device, which comprises a cable attached at a first end to a radio module, the cable having a plurality of electro-magnetic interference (EMI) resistant elements connected at a plurality of positions, a radial board wherein the cable is attached thereto at a second end, and an antenna connected to the radial board, the antenna being configured to receive power from the radio module and to radiate.