Split Ground Plane PCB Antenna for RFID Traceability
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Solution Overview
Problem
Conventional RFID systems for tracking PCBs in cell phone manufacturing face challenges such as damage from high temperatures and chemicals, and require additional space on the PCB, which affects assembly level traceability and supply chain management.
Innovation Solution
The use of a split ground plane on a PCB as a dipole or folded dipole antenna, combined with an RFID IC, which utilizes existing circuit traces to provide efficient communication through electromagnetic fields without increasing the PCB's area, allowing for real-time tracking and automation in assembly and supply chain processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional RFID IC with loop trace antenna is used for PCB tracking, then RFID communication is achieved, but additional costly area on the PCB is required
Solution Approach 1:
The invention merges the ground plane, which is already present on the PCB for electrical grounding, with the RFID antenna function. By splitting the ground plane into two separate ground regions connected through the RFID IC, the system eliminates the need for a separate loop trace antenna, thereby saving PCB area while maintaining RFID communication capability
Solution Approach 2:
The ground plane serves dual functions: it provides electrical grounding for the PCB circuitry and simultaneously acts as the antenna for RFID communication. This multi-functionality eliminates the need for dedicated antenna space, resolving the area contradiction
2Loss of information
If adhesive labels with barcodes are used for PCB tracking, then tracking information can be displayed, but the labels become damaged or lost during high temperature soldering and cleaning processes
Solution Approach 1:
The invention replaces the mechanical adhesive label system with an electronic RFID IC system. The RFID IC is soldered directly to the PCB and uses the ground plane as an antenna, eliminating the need for adhesive labels that are vulnerable to damage during manufacturing processes
Solution Approach 2:
The RFID IC is installed as the first component on the PCB before any high-temperature soldering or chemical cleaning processes. This preliminary installation ensures the tracking device survives subsequent manufacturing steps that would damage adhesive labels
3Reliability
If the ground plane is extensively split to create a dipole antenna, then RFID communication efficiency is improved, but the impact on end product operation increases
Solution Approach 1:
Instead of extensively splitting the ground plane, the invention uses a partial split approach where only sufficient ground regions are separated to create the dipole antenna effect. This partial action achieves adequate RFID communication efficiency while minimizing disruption to the overall ground plane functionality and end product operation
Solution Approach 2:
The invention optimizes the split ground plane configuration by adjusting parameters such as the size and position of ground regions, the length of the dipole arms, and the connection points to the RFID IC. These parameter changes enable effective RFID communication while maintaining acceptable ground plane performance for the end product
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 solution enables accurate and efficient tracking of PCBs throughout assembly and supply chain processes, improving traceability, reducing errors, and enhancing logistics and inventory management, while preventing counterfeiting and theft.
Implementation Method 1
The present invention utilizes already existing circuit traces or ground plane of a PCB. An embodiment of the present invention that uses the ground plane, splits the ground plane (making a dipole or folded dipole antenna) in a way that minimal ground plane needs to be removed therefore causing minimal impact to the operation of an end product containing the PCB
Implementation Method 2
takes advantage of the Frauhaufer zone, where communication is more efficient due to the electromagnetic as opposed to just magnetic fields
Data Source
AI summary
A system, apparatus, and method are provided for using a PCB component as an antenna to allow for RFID communication in the UHF band. The present invention enables supply chain management of a PCB and products containing the PCB by enabling tracking of a PCB at the assembly level such that at each production stage of the board production it is known exactly where the product is and what is its present state of test. One embodiment uses an existing ground plane of a PCB, splitting the ground plane of all the layers of the PCB, allowing for a dipole structure that provides an adequate received energy level to power the circuit to the “on” state thereby allowing RFID/Electronic Product Code transactions. In alternative embodiments, existing or added traces are used in place of the split ground plane as an antenna for the RFID IC. The supply chain management can employ a dedicated RFID interrogator that is connected to an IT network and allows for bill of materials to be fulfilled in an automated fashion throughout the assembly of the PCB. The manufacturer of the end product can also use the RFID IC in an own end product item level supply management system that includes inventory, shipments, and returns.