Resonant Microstrip Housing for Millimeter-Wave Absorber Evaluation
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Solution Overview
Problem
Existing methods for evaluating electromagnetic wave absorbers in high-frequency communication devices, particularly in the millimeter and quasi-millimeter wavebands, fail to provide accurate assessment of their performance due to complex electromagnetic wave behavior caused by resonance and structural influences, making it difficult to select and design effective absorbers.
Innovation Solution
An electromagnetic wave absorber evaluation apparatus and method that utilize a housing with specific dimensions and microstrip lines, designed to resonate at a defined evaluation frequency, allowing for accurate evaluation of absorber characteristics by detecting output signals with high intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic wave absorber is evaluated in actual high-frequency communication device, then evaluation reflects real application conditions, but measurement results become complicated and difficult to interpret due to random resonance and structural influences
Solution Approach 1:
The patent extracts the essential evaluation function from the complex actual device by creating a simplified test device that isolates the electromagnetic wave absorber evaluation from other interfering factors. The test device removes random resonance and structural influences while preserving the core evaluation capability, allowing clear measurement of absorption efficiency without the complexity of full device integration.
Solution Approach 2:
The patent segments the evaluation system into distinct functional components: a controlled housing structure with specific dimensions, positioned electromagnetic wave absorber samples, and measurement circuitry. This segmentation allows each component to be optimized independently and facilitates clear interpretation of measurement results by eliminating confounding factors present in integrated actual devices.
2Reliability
If electromagnetic wave absorber is designed with specific material composition and thickness to absorb target frequency, then absorption efficiency improves, but requires complex evaluation to confirm performance
Solution Approach 1:
The patent employs electromagnetic resonance within the controlled housing structure to amplify and stabilize the measurement signal at the target frequency. By designing the housing dimensions to support specific resonant modes, the system enhances the detectability of absorption characteristics, making it easier to verify whether the absorber meets design specifications for material composition and thickness.
3Measurement precision
If housing dimensions are optimized for resonance at evaluation frequency, then measurement sensitivity increases, but device design becomes more constrained
Solution Approach 1:
The patent establishes clear design guidelines that relate housing dimensions to target evaluation frequency through resonance conditions. By providing formulas and relationships between dimensional parameters and resonant frequency, the patent enables designers to systematically adjust housing dimensions for different frequency targets while maintaining measurement effectiveness. This parameter-based approach preserves design flexibility despite the resonance constraint.
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
Enables precise evaluation of electromagnetic wave absorber performance in millimeter and quasi-millimeter wavebands by minimizing interference from structural and random resonances, ensuring accurate selection and design of absorbers to reduce coupling in high-frequency communication devices.
Implementation Method 1
an electromagnetic wave absorber arranged in a housing... capable of absorbing electromagnetic waves at a specific frequency
Implementation Method 2
designed to resonate at a defined evaluation frequency, allowing for accurate evaluation of absorber characteristics by detecting output signals with high intensity
Data Source
AI summary
An electromagnetic wave absorber evaluation apparatus including: a housing in which the electromagnetic wave absorber is allowed to be arranged, the housing being made of a conductive material with inner dimensions of a width a, a height b, and a length L, as b<a<L; a substrate arranged inside the housing; an input microstrip line and an output microstrip line formed on the substrate along a length direction of the housing and separated from each other in the length direction; and a signal inspecting unit capable of inputting an input signal having a frequency of 20 GHz or more into the input microstrip line and detecting an output signal output through the output microstrip line, in which an evaluation frequency ft obtained by the Formula (1) satisfies the Formula (2) in a frequency region of 20 GHz or more.