RFID Antenna With Welded Metallic Tubes for Multi-Band Operation
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Solution Overview
Problem
Conventional RFID systems require distinct antenna structures for different operating bandwidths, making them costly and not suitable for mass production, as they typically rely on printed circuit boards (PCBs) that are region-specific.
Innovation Solution
The RFID device employs a metallic antenna plate with two metallic tubes, each with a conducting core, insulating layer, and metallic layer, which are welded to the plate and extend across holes of specific shapes to replace the PCB components, allowing for adjustable operation across various bandwidths by modifying the tube lengths and positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distinct antenna structures are designed for each region's operating bandwidth, then the RFID system achieves optimal performance for specific regions, but the manufacturing cost increases and mass production becomes difficult
Solution Approach 1:
The patent applies universality by designing a single antenna structure that can operate across multiple frequency bands (902-928 MHz for US and 865-869 MHz for Europe) without requiring region-specific customization. The metallic tube antenna with adjustable dimensions and the PCB with variable component values enable the same physical structure to serve multiple regional markets, eliminating the need for separate antenna designs for different operating bandwidths.
Solution Approach 2:
The patent employs parameter changes by allowing modification of the antenna's physical dimensions (length, diameter of metallic tubes) and electrical parameters (capacitance and inductance values of matching circuits) to tune the operating frequency. This enables a single base design to be adapted for different frequency bands through parameter adjustment rather than complete redesign, reducing manufacturing complexity while maintaining optimal performance.
2Adaptability or versatility
If a metallic plate with PCB and matching circuits is used to achieve multi-band operation, then the RFID can operate in various bandwidths, but the manufacturing cost is still high
Solution Approach 1:
The patent extracts the matching circuits from the traditional PCB-based antenna design and replaces them with a simplified structure using metallic tubes directly integrated with the metallic plate. This extraction eliminates unnecessary components and simplifies the manufacturing process while maintaining the ability to achieve impedance matching and operate across different frequency bands through geometric adjustments of the metallic tube structure.
Solution Approach 2:
The patent merges the antenna radiating elements and matching network into a single integrated metallic structure. The metallic tubes serve both as the radiating dipole elements and as part of the impedance matching mechanism, combining functions that were previously separated into distinct components. This integration reduces the number of parts, simplifies assembly, and lowers manufacturing cost while preserving multi-band operation capability.
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
This configuration reduces manufacturing costs and improves polarization performance, enabling the RFID device to operate effectively in different bandwidths, such as in the U.S. and Europe, with better vertical and horizontal polarization results compared to prior designs.
Implementation Method 1
The first metallic tube extends across the first hole and is welded to the metallic antenna plate on opposite sides of the first hole
Implementation Method 2
a first insulating layer covering the first conducting core
Implementation Method 3
a first metallic layer covering the first insulating layer
Data Source
AI summary
A radio frequency identification (RFID) device includes a metallic antenna plate, a first metallic tube, and a second metallic tube. The metallic antenna plate has a positioning portion and defines a central axis, a first hole, and a second hole. The positioning portion is formed in the path of the central axis and surrounds the second hole. The first and second metallic tubes are disposed on the metallic antenna plate. The first and second metallic tubes each has one end disposed on the positioning portion. The first and second metallic tubes extend across the first and second holes, respectively and are welded to the metallic antenna plate. The portion of the second metallic tube that extends across the second hole is approximately perpendicular to the portion of the first metallic tube that extends across the first hole.