Coaxial-to-Hollow Waveguide Transition Circuit Heat Dissipation

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Solution Overview

Problem

Coaxial-waveguide-to-hollow-waveguide transition circuits face degradation in electrical characteristics when high electric power is input, due to heat generation and deformation of metal probes, and existing solutions either suffer from narrow-band characteristics or ineffective heat dissipation.

Innovation Solution

A coaxial-waveguide-to-hollow-waveguide transition circuit design featuring a hollow waveguide with a strip conductor that makes a short-circuit connection between a conducting core wire and the termination surface or narrow walls, allowing for efficient heat dissipation and maintaining broad-band characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a metal probe is used to couple transmission modes in a coaxial-waveguide-to-hollow-waveguide transition circuit, then electrical characteristics in a broad frequency band can be implemented, but the probe tip generates heat and deforms when high electric power is input, degrading electrical characteristics

Engineering Contradiction:

Improvebroad frequency band characteristicsVSAvoidelectrical characteristics stability under high power

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

A dielectric member is introduced as an intermediary between the coaxial core wire and the hollow waveguide. This dielectric mediator allows the coaxial core wire to be positioned without direct contact with the hollow waveguide walls, preventing heat generation and deformation while maintaining broad-band electrical characteristics through proper impedance matching.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the coaxial core wire is extended into the hollow waveguide to improve coupling, then electrical characteristics are improved, but the tip portion generates excessive heat when high electric power is input

Engineering Contradiction:

Improveelectrical characteristicsVSAvoidheat generation at probe tip

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The dielectric member serves as a thermal and electrical intermediary, allowing the coaxial core wire to extend into the hollow waveguide region for improved coupling while the dielectric prevents direct metal-to-metal contact that would cause excessive heat generation at the tip.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The dielectric constant and physical dimensions of the dielectric member are optimized to achieve proper impedance transformation and coupling between the coaxial and hollow waveguide modes, enabling effective power transfer while controlling heat generation through parameter selection.

Inventive Principle:

Principle #35Parameter changes

3Temperature

If magnetic field coupling is used to convert transmission mode, then heat dissipation is improved, but electrical characteristics become narrow-band

Engineering Contradiction:

Improveheat dissipationVSAvoidfrequency band width

Core Design Contradiction:

TemperatureVSAdaptability or versatility

Solution Approach 1:

The invention replaces magnetic field coupling mechanisms with electric field coupling through a dielectric-loaded coaxial structure. This substitution enables broad-band electrical characteristics while the dielectric member manages heat dissipation by preventing direct metal contact and providing thermal isolation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 design effectively dissipates heat generated at the probe tip, preventing deformation and maintaining stable broad-band electrical characteristics even under high power input, without affecting the electric field distribution or impedance.

Implementation Method 1

the heat generated at a tip portion of the conducting core wire is dissipated by the strip conductor

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

The strip conductor makes a short-circuit connection between the at least one conducting core wire and at least one of the termination surface and at least one narrow wall

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS10992018B2Coaxial-waveguide-to-hollow- waveguide transition circuit

Publication Date: 2021.04.27 MITSUBISHI ELECTRIC CORP

AI summary

A coaxial-waveguide-to-hollow-waveguide transition circuit (1) includes a hollow waveguide (10), a coaxial waveguide (20) having an end coupled to a wide wall (16) of the hollow waveguide (10), and a strip conductor (30) located inside the internal path (10h) of the hollow waveguide (10). The coaxial waveguide (20) includes a conducting core wire (22) extending into the internal path (10h) of the hollow waveguide (10). The strip conductor (30) is located so as to make a short-circuit connection between the conducting core wire (22) of the coaxial waveguide (20) and a termination surface (12) of the hollow waveguide (10).