Reflected-Wave Phase Discriminator for Automated Impedance Matching

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Solution Overview

Problem

Existing methods for compensating impedance mismatch in wireless communications systems, such as using Smith charts, require human intervention and are inefficient, especially when the load impedance is unknown, leading to prolonged impedance matching times.

Innovation Solution

A phase discriminator for reflected waves that includes a sensing impedance network, directional coupler, and controller to determine the range of phase based on reflection coefficient magnitude, simplifying the circuitry and reducing power consumption by minimizing the need for full impedance combinations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Extent of automation

If Smith chart is used for impedance matching, then impedance matching can be achieved, but human intervention is required and automation is difficult

Engineering Contradiction:

Improveautomation of impedance matchingVSAvoidhuman intervention requirement

Core Design Contradiction:

Extent of automationVSEase of operation

Solution Approach 1:

The system performs self-diagnosis by automatically measuring reflection coefficients and determining phase regions without human intervention. The controller autonomously controls the impedance matching network to adjust impedance based on measured data, enabling fully automated impedance matching that eliminates the need for manual Smith chart operations

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The manual mechanical process of using Smith charts is replaced by an electronic measurement and control system. The system uses reflection coefficient measurements, phase region determination algorithms, and automated control signals to substitute the manual graphical method with an electronic automated process

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If all impedance combinations of variable impedance matching network are tested, then complete impedance matching can be achieved, but impedance matching time is prolonged

Engineering Contradiction:

Improveimpedance matching speedVSAvoidimpedance matching time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The impedance matching process is segmented into distinct phases: measurement phase (measuring reflection coefficient), determination phase (calculating phase region using discriminant values), and adjustment phase (controlling impedance matching network). This segmentation allows the system to focus on specific regions rather than exhaustively testing all combinations, significantly reducing matching time

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of testing all possible impedance combinations, the system performs partial action by determining the phase region (e.g., upper/lower half plane, left/right half plane) and only adjusting impedance within that specific region. This partial approach to full enumeration dramatically reduces the search space and matching time

Inventive Principle:

Principle #16Partial or excessive action

3Device complexity

If full impedance combinations are performed for impedance matching, then accurate matching can be achieved, but circuit complexity increases

Engineering Contradiction:

Improvecircuit structure simplificationVSAvoidimpedance matching accuracy

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The system extracts only the essential information needed for impedance matching by measuring reflection coefficient magnitude and phase region, rather than requiring complete impedance characterization. This extraction approach simplifies the measurement and control circuitry while maintaining matching accuracy through targeted measurements and intelligent algorithms

Inventive Principle:

Principle #2Taking out (Extraction)

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 rapid impedance matching by reducing the number of candidate load impedances and simplifying hardware configuration, automating impedance matching processes while minimizing power consumption.

Implementation Method 1

a directional coupler disposed between the signal source and the sensing impedance network

Methodology Applied

Scientific EffectDirectional coupling:

Data Source

PatentUS20250216430A1Phase discriminator for reflected waves and operating method thereof

Publication Date: 2025.07.03 ELECTRONICS & TELECOMM RES INST

AI summary

The present disclosure provides an apparatus and method of discriminating a phase of reflected waves. The apparatus includes a sensing impedance circuit disposed between a signal source and a load and having a variable sensing impedance, a directional coupler disposed between the signal source and the sensing impedance network, and a controller configured to detect intensities of an input signal transmitted from the signal source to the load and a reflected signal reflected from the load, determine a magnitude of the reflection coefficient based on the intensities of the signals, determine a difference in the magnitude of the reflection coefficient based on a plurality of magnitudes of the reflection coefficients obtained with respect to different sensing impedances, discriminate a range of the phase of the reflected waves based on the difference in the magnitude of the reflection coefficient, and control the sensing impedance network to change the sensing impedance.