Dual-Mode Near-Field Far-Field Antenna Assembly for RFID
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current RFID systems either operate over short distances with near-field characteristics, limiting their application, or over long distances with far-field characteristics, but not both, due to differences in electromagnetic wave propagation and antenna designs, leading to increased complexity and cost for separate systems.
Innovation Solution
A wireless data-reader communications device equipped with both near-field and far-field antenna structures, along with a processor and memory, allowing selection of operational modes to interrogate data-provider devices using either near-field or far-field antennas based on distance, enabling dual-mode operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If UHF RFID systems operate over long distances through electromagnetic wave propagation, then communication range is improved, but performance becomes more susceptible to dielectric and conducting objects
Solution Approach 1:
The patent combines both near-field and far-field antenna structures into a single RFID reader device, enabling it to operate in both magnetic induction mode (for short-range, stable communication) and electromagnetic wave propagation mode (for long-range coverage). This merging allows the system to overcome the limitation of having to choose between range and reliability.
Solution Approach 2:
The system dynamically switches between near-field and far-field operational modes based on the distance to and characteristics of the target tag. The reader can adaptively select the appropriate antenna and communication mode, transitioning from magnetic induction for close proximity to electromagnetic wave propagation for distant tags, optimizing both range and reliability according to real-time conditions.
2Reliability
If HF RFID systems operate using magnetic induction over short distance, then susceptibility to dielectric and conducting objects is reduced, but communication range is limited
Solution Approach 1:
The patent integrates both near-field (magnetic induction) and far-field (electromagnetic wave) capabilities into a single device, allowing the system to maintain the reliability advantages of magnetic induction for short-range communication while gaining access to long-range electromagnetic wave propagation when needed.
Solution Approach 2:
The system dynamically selects between magnetic induction mode for short-distance, high-reliability communication and electromagnetic wave mode for extended range applications, adapting to the specific operational requirements and distance to target tags.
3Adaptability or versatility
If separate near-field and far-field systems are implemented, then both short-range and long-range communication capabilities are achieved, but device complexity and cost increase
Solution Approach 1:
The patent combines both near-field and far-field antenna structures and their associated circuitry into a single integrated RFID reader device, sharing common components such as the processor, memory, and control logic. This integration achieves dual-mode communication capability while reducing overall system complexity and cost compared to implementing separate systems.
Solution Approach 2:
The RFID reader is designed as a universal device that can perform both near-field magnetic induction communication and far-field electromagnetic wave propagation communication, eliminating the need for separate specialized systems and reducing overall system complexity.
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 wireless communication over both short and long distances, reducing complexity and cost by utilizing a single device with dual antenna capabilities, enhancing performance in various industrial applications.
Implementation Method 1
Low frequency and high frequency RFID systems (LF/HF i.e. 13.56 MHz) are short-range systems based on inductive coupling between respective antennas of a reader and a data-provider device through a magnetic field.
Implementation Method 2
Ultra-high frequency (UHF i.e. 860-960 MHz) and microwave (i.e. 2.4 GHz and 5.8 GHz) RFID systems can be long-range systems that use electromagnetic waves propagating between respective antennas of a reader and data-provider device.
Data Source
AI summary
Systems, methods, and devices wirelessly communicate in a near-field region and a far-field region. A device may include a near-field antenna and a far-field antenna. The device may be configured to selectively operate in a near-field mode, employing the near-field antenna, and/or in a far-field mode, employing the far-field antenna, and/or in a joint mode, employing both the near-field antenna and the far-field antenna separately or concurrently. One type of device may be a wireless communications data-reader device configured for both near-field and far-field communications. Another type of device may be a wireless communications data-provider device configured for both near-field and far-field communications.