Hollow Waveguide to Planar Transition Circuit with Coupling Conductor

Solution Overview

Problem

The existing hollow-waveguide-to-microstrip-line transition circuits are complicated and costly due to the need for connecting conductors to suppress unnecessary radiation, which increases manufacturing complexity and cost.

Innovation Solution

A hollow-waveguide-to-planar-waveguide transition circuit design that eliminates the need for connecting conductors by using a dielectric substrate with strip conductors, a ground conductor, and a coupling conductor with protruding portions to face and couple with slots, effectively suppressing radiation while reducing manufacturing complexity and cost.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-generated harmful factors

If connecting conductors are added to suppress unnecessary radiation, then radiation suppression is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improveunnecessary radiationVSAvoidmanufacturing complexity

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

The invention extracts and eliminates the connecting conductors from the transition circuit structure. By redesigning the ground conductor to include integrated slots and positioning the coupling conductor to face these slots, the patent achieves radiation suppression without requiring separate connecting conductors, thus simplifying the overall device structure while maintaining the harmful factor suppression effect

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention merges the ground conductor structure with the slot configuration, integrating the radiation suppression function directly into the ground conductor and coupling conductor arrangement. This consolidation eliminates the need for additional connecting conductors, reducing device complexity while maintaining effective radiation control

Inventive Principle:

Principle #5Merging (Combining)

2Object-generated harmful factors

If connecting conductors are added to suppress unnecessary radiation, then radiation suppression is improved, but manufacturing cost increases

Engineering Contradiction:

Improveunnecessary radiationVSAvoidmanufacturing cost

Core Design Contradiction:

Object-generated harmful factorsVSEase of manufacture

Solution Approach 1:

The invention extracts and eliminates the connecting conductors from the transition circuit structure. By redesigning the ground conductor to include integrated slots and positioning the coupling conductor to face these slots, the patent achieves radiation suppression without requiring separate connecting conductors, thus simplifying the overall device structure while maintaining the harmful factor suppression effect

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention merges the ground conductor structure with the slot configuration, integrating the radiation suppression function directly into the ground conductor and coupling conductor arrangement. This consolidation eliminates the need for additional connecting conductors, reducing device complexity while maintaining effective radiation control

Inventive Principle:

Principle #5Merging (Combining)

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 achieves low manufacturing cost and high operation reliability by efficiently suppressing unnecessary radiation without requiring connecting conductors, thus simplifying the manufacturing process and enhancing performance.

Implementation Method 1

a coupling conductor formed at a position to be electrically coupled with the one or more strip conductors on the first main surface, and disposed at a position facing the one or more slots in the thickness direction

Methodology Applied

Scientific EffectCapacitive coupling: Capacitance

Data Source

PatentUS11069949B2Hollow-waveguide-to-planar-waveguide transition circuit comprising a coupling conductor disposed over slots in a ground conductor

Publication Date: 2021.07.20 MITSUBISHI ELECTRIC CORP

AI summary

A hollow-waveguide-to-planar-waveguide transition circuit includes: strip conductors formed on a first main surface of a dielectric substrate; a ground conductor formed on the back side, facing the strip conductors; a slot formed in the ground conductor; and a coupling conductor formed at a position to be electrically coupled with the strip conductors. The coupling conductor has: a main body portion electrically coupled with the strip conductors; and protruding portions protruding from the main body portion. The protruding portions are formed so as to face an end portion of the slot.