Planar Antenna Isolation Board Using Distributed Elements
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Solution Overview
Problem
Conventional utility meters face challenges with insufficient high voltage isolation, which compromises safety and performance, particularly due to the use of expensive high voltage capacitors and manual dielectric overcoating processes that introduce variability in antenna board voltage isolation and RF performance.
Innovation Solution
A printed circuit board antenna isolation circuit using distributed elements, such as multilayer distributed capacitors or transformers, provides high voltage isolation and RF coupling functions, eliminating the need for expensive capacitors and manual overcoating, and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high voltage capacitors and manual dielectric overcoating are used, then voltage isolation is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the manual dielectric overcoating process and discrete high voltage capacitors from the antenna isolation board design. Instead, it uses the printed circuit board substrate itself as the isolation medium, integrating the isolation function directly into the board structure rather than adding separate components and processes.
Solution Approach 2:
The patent merges the functions of voltage isolation and RF signal transmission into a single integrated PCB structure. The ground plane and signal traces are combined in the same substrate, eliminating the need for separate capacitors and overcoating layers while maintaining both isolation and RF performance.
2Reliability
If discrete high voltage capacitors are used, then voltage isolation is provided, but cost increases
Solution Approach 1:
The patent removes discrete high voltage capacitors from the bill of materials entirely. The voltage isolation function is achieved through the PCB substrate's inherent dielectric properties and ground plane configuration, eliminating the need to purchase and install expensive high voltage capacitor components.
Solution Approach 2:
The patent replaces expensive discrete high voltage capacitors with a cost-effective PCB substrate structure. The isolation function is achieved through standard PCB materials and manufacturing processes rather than specialized expensive components, significantly reducing material costs.
3Reliability
If manual dielectric overcoating is applied, then voltage isolation is enhanced, but manufacturing precision varies
Solution Approach 1:
The patent eliminates the manual dielectric overcoating process entirely. Instead of relying on variable manual application, the voltage isolation is achieved through the factory-controlled PCB manufacturing process, which provides consistent dielectric properties across all boards without requiring additional manual steps.
Solution Approach 2:
The patent replaces the mechanical manual overcoating process with an electrical/field-based isolation mechanism using the PCB ground plane and substrate. This substitution eliminates the variability inherent in manual application while maintaining effective voltage isolation through controlled impedance design.
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 reduces costs and improves reliability by using distributed elements for high voltage isolation and RF coupling, ensuring safe and efficient operation of utility meters.
Implementation Method 1
A dielectric material separates each of the plurality of layers
Implementation Method 2
A distributed circuit element is electrically connected to the first radio frequency port and to the second radio frequency port
Data Source
AI summary
An antenna isolation circuit, meter reading device, and method of manufacturing an antenna isolation circuit may employ or be associated with a multilayer planar structure. A multilayer planar structure antenna isolation circuit uses distributed elements to provide high voltage isolation and RF coupling functions. The distributed elements may be implemented, for example, as multilayer distributed capacitors. In other embodiments, the distributed elements may be implemented as a distributed transformer.