Radiated Emission Measuring Device Using Digital Filtering
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Solution Overview
Problem
Current radiated emission measuring devices require a large number of measurement points and significant time to find positions of maximum electric field strengths, which is skill-dependent and time-consuming, especially for devices measuring frequencies between 30 MHz and 1000 MHz.
Innovation Solution
A radiated emission measuring device equipped with an electric field measuring device, position adjustment unit, and arithmetic processing unit that sets measurement points on a virtual surface, interpolates zero values between points, applies a digital low pass filter, and identifies maximum electric field strength positions efficiently, reducing the number of necessary measurement points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement is performed at a fine interval (1 cm and 1°) to accurately find maximum electric field strength positions, then measurement precision is improved, but the number of measurement points increases to 140,000 points and measurement time is significantly increased
Solution Approach 1:
The measurement space is segmented into two parts: a coarse grid for initial scanning and a refined grid around identified maxima. This allows most of the space to be searched coarsely while only small regions around potential maxima require fine measurement, dramatically reducing total measurement points while maintaining accuracy.
Solution Approach 2:
A preliminary coarse measurement is performed first to identify candidate regions containing maximum electric field strengths. Based on these preliminary results, the system determines where fine measurements are actually needed, avoiding unnecessary fine measurements in regions that do not contain maxima.
2Productivity
If a measurement engineer uses intuition and experience to identify maximum electric field strength positions, then measurement time is shortened, but the result depends on the engineer's skill and training expense is required
Solution Approach 1:
The system performs self-service by automatically identifying maximum electric field strength positions through its own measurement and processing capabilities. The computer automatically analyzes measurement data, identifies maxima, and determines subsequent measurement points without human intervention, making the process both fast and reliable.
Solution Approach 2:
The manual mechanical process of engineer judgment and intuition is replaced with an automated computational system. The computer executes standardized algorithms to identify maxima, replacing the variable human judgment process with a consistent, repeatable automated process that does not depend on individual skill levels.
3Measurement precision
If comprehensive measurement of electric fields at every antenna height and angle is performed, then measurement precision is improved, but device complexity and measurement time are significantly increased
Solution Approach 1:
Instead of performing exhaustive measurement at all possible points, the system performs partial measurements only where necessary. Fine measurements are conducted only in regions identified as containing maxima, while other regions are measured coarsely or not at all, achieving sufficient precision with reduced complexity.
Solution Approach 2:
The measurement strategy is dynamic rather than static. The system adapts the measurement density based on the characteristics of the electric field distribution being measured, concentrating measurement effort in regions of interest (near maxima) and using coarser measurement elsewhere, optimizing the balance between precision and complexity.
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 allows for the rapid identification of maximum electric field strength positions regardless of the engineer's skill level, significantly reducing measurement time and the number of required points, while maintaining accuracy.
Implementation Method 1
an antenna configured to detect at least one of electric fields and electric field strengths
Implementation Method 2
a second arithmetic process of applying a digital low pass filter in which the predetermined frequency is a cutoff frequency to at least one of the electric field distribution and the electric field strength distribution
Data Source
AI summary
A radiated emission measuring device includes: an electric field measuring device and an arithmetic processing unit. The arithmetic processing unit performs: a first arithmetic process of creating at least one of an electric field distribution and an electric field strength distribution of the plurality of measurement points measured by the electric field measuring device and inputting zero to at least one of an electric field and electric field strengths at a certain point between two neighboring measurement points; a second arithmetic process of applying a digital low pass filter to at least one of the electric field distribution and the electric field strength distribution obtained in the first arithmetic process; and a third arithmetic process of specifying a position at a maximum electric field strength from at least one of an electric field distribution and an electric field strength distribution obtained in the second arithmetic process.