Encapsulated Microwave Waveguide Interface for Leak-Safe Transmission

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Solution Overview

Problem

Existing microwave transmission arrangements face challenges in ensuring safe encapsulation to prevent spark-ignition in explosive environments while maintaining sufficient microwave energy transmission, particularly due to potential leaks at the interface between dielectric sealing elements and hollow waveguides.

Innovation Solution

A microwave transmission arrangement with a separator sheet sandwiched between the microwave circuit board and the hollow waveguide, allowing microwave passage through the separator sheet, which is configured to prevent leaks and provide a robust encapsulation, and includes a dielectric portion for efficient microwave transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a dielectric sealing element is arranged inside the hollow waveguide to provide a seal, then encapsulation is provided to avoid spark-ignition requirements, but leakage at the interface between the dielectric sealing element and the hollow waveguide can occur allowing flammable gas to contact unprotected circuitry

Engineering Contradiction:

Improveencapsulation integrityVSAvoidleakage risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A separator sheet is introduced as an intermediary component between the hollow waveguide and the microwave circuit board. This separator sheet serves as a mediator that provides an additional sealing barrier, preventing direct contact between flammable gas that might leak along the waveguide-separator interface and the unprotected microwave transceiver circuitry on the circuit board.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The encapsulation system is segmented into multiple barriers: the dielectric sealing element inside the waveguide and the separator sheet between the waveguide and circuit board. This segmentation creates multiple independent sealing interfaces, so that a leak at one interface does not necessarily compromise the entire encapsulation system.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the separator sheet is made thick to prevent leakage, then encapsulation safety is improved, but microwave transmission efficiency decreases

Engineering Contradiction:

Improveleak preventionVSAvoidmicrowave transmission loss

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The separator sheet is designed with optimized parameters including specific thickness (balanced between safety and transmission), material composition (dielectric properties), and aperture geometry. By carefully adjusting these parameters, the separator sheet provides sufficient leakage protection while maintaining acceptable microwave transmission efficiency through the use of apertures or slots that allow microwave passage.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The separator sheet has different properties in different regions: it is made of dielectric material with specific properties to block gas leakage while allowing microwave transmission through apertures or slots. The local quality of the material and structure is optimized to simultaneously achieve both sealing and transmission functions.

Inventive Principle:

Principle #3Local quality

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 solution effectively prevents leaks and ensures safe encapsulation, meeting Ex certification requirements for explosive environments while maintaining efficient microwave signal transmission.

Implementation Method 1

a separator sheet sandwiched between the microwave circuit board and the first end of the hollow waveguide, the separator sheet being configured to allow passage of microwaves between the patch and the hollow waveguide through the separator sheet

Methodology Applied

Scientific EffectMicrowave transmission through dielectric material: Dielectric

Implementation Method 2

a patch for radiating or receiving microwave signals

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Implementation Method 3

an electrically conductive hollow waveguide extending from a first end to a second end and arranged to guide microwave signals radiated by the patch from the first end towards the second end

Methodology Applied

Scientific EffectWaveguide propagation: Waveguide

Data Source

PatentUS12553760B2Microwave transmission arrangement with encapsulation, communication and/or measurement system and radar level gauge system

Publication Date: 2026.02.17 ROSEMOUNT TANK RADAR

AI summary

A microwave transmission arrangement, comprising a microwave circuit board including a patch; microwave transceiver circuitry coupled to the patch; an electrically conductive hollow waveguide arranged to guide microwave signals between a first end and a second end; and a separator sheet sandwiched between the microwave circuit board and the first end of the hollow waveguide, the separator sheet being configured to allow passage of microwaves between the patch and the hollow waveguide through the separator sheet. The separator sheet is included in an encapsulation separating an encapsulated interior of the microwave transmission arrangement from an exterior outside the encapsulation, the patch, and the microwave transceiver circuitry being in the encapsulated interior, and the hollow waveguide being in the exterior outside the encapsulation.