EM Absorption Sheet for Fast Near-Field Radiation Mapping

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Solution Overview

Problem

Existing methods for measuring electromagnetic radiation from devices, particularly in the 30-300 GHz frequency range, suffer from inaccuracies, high costs, and time-consuming procedures, making it difficult to assess electromagnetic field compliance for safe device operation.

Innovation Solution

An absorption sheet with a substrate of low thermal and electrical conductivity, embedded with an array of absorption elements comprising conductive and resistive portions, is used to convert electromagnetic energy into heat, allowing for rapid and accurate radiation characterization through thermal imaging.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional phaseless measurement techniques with miniaturized diode-loaded probes are used, then measurement can be performed, but measurement precision is reduced due to uncertainty and expensive equipment is required

Engineering Contradiction:

Improvemeasurement precisionVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces conventional electrical measurement probes with a thermal imaging system. The absorption sheet converts electromagnetic energy to thermal energy, and a thermal camera captures the radiation pattern. This substitution eliminates the need for complex calibrated electrical probes and phase reconstruction algorithms, thereby improving measurement precision while reducing device complexity and cost.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the measurement parameter from electrical field detection to thermal radiation detection. By converting electromagnetic energy to thermal energy through the absorption sheet, the system measures temperature distribution instead of electrical field strength, simplifying the measurement system and improving accuracy.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If scanning measurement techniques are used, then electromagnetic radiation can be characterized, but measurement time increases making the process time demanding

Engineering Contradiction:

Improvemeasurement speedVSAvoidmeasurement time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The absorption sheet is divided into multiple independent absorption elements, each corresponding to a specific spatial location. This segmentation allows parallel measurement of multiple points simultaneously through thermal imaging, eliminating the need for sequential scanning and dramatically reducing measurement time.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The thermal imaging system continuously captures the entire radiation pattern in real-time, maintaining continuous measurement of all absorption elements simultaneously. This eliminates the intermittent nature of scanning measurements, where the probe must move between positions, thereby improving productivity and reducing total measurement time.

Inventive Principle:

Principle #20Continuity of useful action

3Measurement precision

If conventional measurement techniques are used, then electromagnetic field data can be obtained, but cost increases due to expensive equipment requirements

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidcost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The absorption sheet uses inexpensive materials including substrate, conductive material, and resistive material that can be easily manufactured and replaced if needed. This replaces expensive, precision-calibrated electrical probes with a low-cost thermal measurement system, reducing equipment cost while maintaining measurement accuracy through the thermal imaging approach.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 method provides quick and precise estimation of electromagnetic radiation by converting electromagnetic energy into localized heat, enabling efficient compliance testing of devices like 5G equipment.

Implementation Method 1

a resistive portion embedded in the conductive portion, the resistive portion adapted to absorb heat from a current generated by the electromagnetic wave in the conductive portion

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

an array of absorption elements configured to absorb electromagnetic energy from the electromagnetic wave, the array of absorption elements embedded in or arranged on the substrate

Methodology Applied

Scientific EffectElectromagnetic energy absorption: Absorption (EM radiation)

Data Source

PatentUS20260016399A1Absortion sheet for absorbing power from an electromagnetic wave, system for performing a radiation characterization, method for measuring an electromagnetic radiative near field using the same

Publication Date: 2026.01.15 MXWAVES AB

AI summary

An absorption sheet for absorbing power from an electromagnetic wave generated by a device under test includes a substrate and an array of absorption elements. Each absorption element includes a conductive portion and a resistive portion. A system for performing a radiation characterization includes the absorption sheet. A method of measuring a radiative near field of a device under test and a method of characterizing a radiative near field of a device under test are also disclosed.