Wireless Tag Communication Device Polarization Control

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Solution Overview

Problem

Existing wireless tag communication devices inefficiently search for RFID tags due to constant switching of polarization directions, resulting in unnecessary radio wave output in non-contributory polarization directions, which hampers efficient communication and location identification.

Innovation Solution

A wireless tag communication device with an antenna capable of transmitting and receiving carrier waves in dual polarization modes, using a radio wave control unit to switch between first and second carrier waves based on comparison of radio wave intensities received from the RFID tag, optimizing polarization direction for efficient communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the wireless tag communication device constantly switches polarization directions of carrier waves, then it can communicate with RFID tags regardless of their orientation, but it outputs unnecessary radio waves in non-contributory polarization directions, reducing communication efficiency

Engineering Contradiction:

Improvecommunication capability with different tag orientationsVSAvoidunnecessary radio wave emission

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The device monitors the intensity of response waves from RFID tags and uses this feedback to dynamically adjust the polarization direction of transmitted carrier waves. When a tag is detected, the system switches to the polarization direction that maximizes communication efficiency, eliminating unnecessary radio wave emission in other directions.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The polarization direction of the carrier wave is made dynamic rather than static or constantly switching. The system adapts the polarization direction in real-time based on the detected orientation of the target RFID tag, transitioning from a fixed switching pattern to an adaptive dynamic control mechanism.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the device uses dual polarization modes to search for RFID tags, then it can identify tags with any antenna orientation, but it increases the complexity of radio wave control and comparison operations

Engineering Contradiction:

Improveability to detect tags with any antenna orientationVSAvoidradio wave control and comparison mechanism

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Instead of continuously switching between both polarization directions, the device performs partial action by selecting and using only the necessary polarization direction once a tag is detected. This reduces the complexity of control operations while maintaining the ability to handle any tag orientation during the initial search phase.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If the wireless tag communication device outputs carrier waves in both polarization directions continuously, then it ensures comprehensive tag detection, but it extends the time required to identify tag position and reduces search efficiency

Engineering Contradiction:

Improvecomprehensive tag detection coverageVSAvoidtag position identification time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The device uses periodic switching of polarization directions during the initial search phase to ensure comprehensive tag detection coverage. Once a tag is detected, it transitions to a non-periodic adaptive mode where the polarization direction is maintained based on feedback, significantly reducing the time required for tag position identification.

Inventive Principle:

Principle #19Periodic action

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 device efficiently searches for and identifies the position of RFID tags by selectively outputting carrier waves in the most effective polarization direction, reducing unnecessary radio wave emission and enhancing communication efficiency.

Implementation Method 1

an antenna 31 that transmits a carrier wave and receives a response wave output from a wireless tag 21 with respect to the carrier wave

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Implementation Method 2

receives a response wave output from a wireless tag 21 with respect to the carrier wave

Methodology Applied

Scientific EffectElectromagnetic reflection and re-emission: Reflection

Data Source

PatentUS11907795B2Wireless tag communication device and method

Publication Date: 2024.02.20 TOSHIBA TEC KK

AI summary

A wireless tag communication device includes an antenna configured to transmit a carrier wave and receive a response wave output from a wireless tag with respect to the carrier wave and to specify a position of the wireless tag to be searched based on a radio wave intensity of the response wave received by the antenna. The device includes: a radio wave controller configured to switch the carrier wave between a first and second carrier wave to be transmitted in a first and second polarization direction respectively; and a comparator configured to compare a first and second radio wave intensity of a first and second response wave respectively output from the wireless tag with respect to the first and second carrier waves respectively, and the radio wave controller switches the carrier wave between the first carrier wave and the second carrier wave based on a comparison result of the comparator.