High-Frequency Module Waveguide Structure for EM Wave Blocking

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Solution Overview

Problem

The manufacturing of high-frequency modules is hindered by the need for complex processes and increased workloads due to the requirement of placing radio wave absorbers on the metal case to block unwanted electromagnetic waves, which raises costs and complexity.

Innovation Solution

A high-frequency module configuration that employs waveguide structures on the top surface of the metal case, with dimensions corresponding to a quarter-wave of the target electromagnetic wave's cutoff frequency, allowing only the TE10 mode to propagate, effectively canceling out unwanted electromagnetic waves without the need for a radio wave absorber.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a radio wave absorber is disposed on the top surface or side surface of the metal case to block unwanted electromagnetic waves, then the propagation of unwanted electromagnetic waves is suppressed, but the work loads and work costs increase due to machining and mounting processes

Engineering Contradiction:

Improveunwanted electromagnetic wave propagationVSAvoidmanufacturing work loads and costs

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The invention extracts and eliminates the radio wave absorber component entirely, replacing it with a purely structural waveguide configuration. The waveguide structure uses only metal walls and geometric dimensions (width, height, length) to achieve electromagnetic wave blocking, removing the need for separate absorber materials, their machining, and their mounting processes.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The waveguide structure serves its own electromagnetic wave blocking function through its geometric configuration alone. The dimensions of the waveguide (width a, height b, length l) are designed to create cutoff frequencies that naturally block unwanted modes, making the structure self-sufficient without requiring additional radio wave absorber materials or assembly steps.

Inventive Principle:

Principle #25Self-service

2Object-affected harmful factors

If a radio wave absorber is used to block unwanted electromagnetic waves, then the resonance and unwanted ripples in frequency characteristics are suppressed, but the device complexity increases

Engineering Contradiction:

Improveresonance and unwanted ripplesVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The invention segments the waveguide structure into specific dimensional parameters (width a, height b, length l) that are independently optimized. The width and height determine the cutoff frequency for different modes, while the length controls the blocking effectiveness. This segmentation allows precise control over which electromagnetic modes are blocked without adding complex components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention uses parameter changes in the waveguide dimensions to control electromagnetic wave propagation. By adjusting the width, height, and length of the waveguide, the cutoff frequencies for different modes (TE10, TE20, TM11, etc.) are precisely controlled to block unwanted frequencies while allowing desired signals to pass, achieving suppression of resonance and ripples through dimensional optimization rather than complex material properties.

Inventive Principle:

Principle #35Parameter changes

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 configuration achieves significant electromagnetic wave blocking, reducing manufacturing costs and workloads by eliminating the need for radio wave absorbers and providing a substantial attenuation effect, such as 35 dB at 302 GHz, while maintaining a large blocking effect across a specific frequency band.

Implementation Method 1

a height of each of the plurality of waveguide structures has a dimension corresponding to a quarter-wave of a cutoff frequency indicating a frequency band of a target electromagnetic wave to be blocked

Methodology Applied

Scientific EffectElectromagnetic wave absorption: Absorption (EM radiation)

Implementation Method 2

a width and a length of each of the plurality of waveguide structures have dimensions that allow only a high-frequency wave of a TE10 mode to propagate in the frequency band

Methodology Applied

Scientific EffectWaveguide mode filtering: Waveguide

Data Source

PatentUS11749873B2High-frequency module

Publication Date: 2023.09.05 NIPPON TELEGRAPH & TELEPHONE CORP

AI summary

A plurality of waveguide structures are loaded on a top surface opposed to a bottom surface of a metal case, on which a high-frequency circuit is mounted, a height, a width, and a length of each of the plurality of waveguide structures have dimensions corresponding to a quarter-wave of a cutoff frequency indicating a frequency band of a target electromagnetic wave to be blocked, and a width and a length of each of the plurality of waveguide structures have dimensions that allow only a high-frequency wave of a mode to propagate in the frequency band.