Self-Steering Passive RFID Tag Using Distributed Antenna Elements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional smart and reconfigurable antennas are overly complex and expensive due to their requirement for external variable power and complex control mechanisms, limiting their use in wireless network communications, especially for passive RFID tags which have limited communication distances and higher costs compared to active tags.
Innovation Solution
A self-steering, passive RFID tag device that uses a power harvester to obtain power from an unmodulated wireless signal, allowing it to automatically adjust its radiation pattern without external control, using distributed antenna elements and a control unit to enhance communication effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If smart or reconfigurable antennas are used to enable adaptive communication, then communication effectiveness and adaptability are improved, but device complexity and cost increase significantly
Solution Approach 1:
The antenna system is divided into multiple distributed antenna elements that can be independently controlled. Each element can be selectively activated to create different radiation patterns, enabling adaptability without requiring a complex reconfigurable antenna structure. This segmentation allows the system to achieve smart antenna functionality through simple on/off switching of individual elements rather than complex continuous adjustment mechanisms.
2Adaptability or versatility
If external variable power supplies and control mechanisms are provided for smart/reconfigurable antennas, then antenna configuration flexibility is improved, but device complexity and cost increase
Solution Approach 1:
The antenna system performs self-steering by automatically selecting and activating appropriate antenna elements based on the desired communication direction. The control unit within the system autonomously determines which elements to activate without requiring external control signals or complex external control mechanisms. This self-service capability eliminates the need for elaborate external control logic while maintaining configuration flexibility.
3Ease of manufacture
If passive RFID tags are used to reduce cost, then device cost is reduced, but communication distance and adaptability are limited
Solution Approach 1:
The system uses asymmetric activation of distributed antenna elements around the tag to create directional radiation patterns. By selectively activating elements in specific geometric arrangements, the passive tag can focus its communication energy in particular directions, effectively extending communication distance without requiring additional power or complex active components. This asymmetric element activation enables adaptability while maintaining passive tag simplicity and low cost.
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 efficient, self-powered communication with improved radiation pattern adjustment, potentially replacing expensive active RFID tags by enhancing communication distances and reducing infrastructure needs, while maintaining low complexity and cost.
Implementation Method 1
a power harvester configured to obtain power from the unmodulated wireless signal
Implementation Method 2
a plurality of distributed antenna elements disposed generally about the periphery of the device... that act to provide a non-symmetric radiation pattern
Data Source
AI summary
A passive, self-steering antenna device is provided along with methods pertaining to operations and controls of the antenna device. The antenna device can include a main antenna for receiving an unmodulated wireless signal, a power harvester configured to obtain power from the unmodulated wireless signal, a main circuit disposed in a central region of the antenna device, and a plurality of peripheral distributed antenna elements configured to modify the radiation pattern of the antenna device. The antenna device can be configured to operate automatically device without needing control information in response to receiving a message from another antenna. Related methods include operations and controls for such an antenna device including automatically performing actions to enhance communications with another antenna device by selecting and activating a subset of the peripheral antenna elements to create a radiation pattern.