RFID Loop Electrode Antenna Integration on PCB
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Solution Overview
Problem
RFID tags require multiple manufacturing processes and space for dedicated antennas, increasing cost and size, especially when using meander-shaped antennas, and necessitate impedance matching sections, which complicates design and size adjustments.
Innovation Solution
A radio frequency IC device that uses a loop electrode on a circuit board to function as both an antenna and for impedance matching, eliminating the need for a dedicated antenna and matching section, allowing for efficient signal transmission between the IC chip and the electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated antenna is provided in the printed circuit board, then the RFID tag can communicate wirelessly, but the number of manufacturing processes increases and the size increases
Solution Approach 1:
The patent merges the antenna function with the existing ground electrode on the circuit board. Instead of providing a separate dedicated antenna, the ground electrode is designed to serve dual purposes: as an electrical ground reference and as the radiating element for wireless communication. This integration eliminates the need for separate antenna manufacturing processes while maintaining RFID communication capability.
Solution Approach 2:
The ground electrode is given multiple functions: it serves as both the ground reference for the IC chip and as the antenna for electromagnetic communication. This multi-functionality reduces the overall component count and simplifies the manufacturing process, as the same structural element performs both electrical grounding and wireless signal transmission.
2Reliability
If a matching section is disposed between the antenna and the IC chip, then impedance matching is achieved, but the size of the antenna is increased
Solution Approach 1:
The patent combines the impedance matching function with the ground electrode structure itself. By carefully designing the geometry, size, and position of the ground electrode, it simultaneously serves as the antenna and provides the necessary impedance matching characteristics. This eliminates the need for a separate matching section that would otherwise increase the overall size.
Solution Approach 2:
The patent achieves impedance matching by adjusting the physical parameters of the ground electrode, such as its area, shape, distance from the IC chip, and positioning relative to other circuit elements. By optimizing these parameters, the ground electrode naturally provides the required impedance characteristics without requiring additional matching components or extended antenna structures.
3Adaptability or versatility
If the IC chip is modified, then the shape of the antenna must be changed
Solution Approach 1:
The ground electrode is designed with universal characteristics that allow it to work with different IC chip types and configurations. Its positioning and dimensional parameters are chosen to provide robust electromagnetic coupling and impedance matching across various chip designs, reducing the need for redesign when different IC chips are used.
Solution Approach 2:
The patent employs adjustable parameters in the ground electrode design, such as its distance from the IC chip, its area, and its shape, which can be optimized for different IC chip configurations. This parametric approach allows the same basic ground electrode structure to adapt to different IC chips without requiring fundamental redesign, thereby maintaining design simplicity while achieving compatibility.
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 approach miniaturizes the RFID tag, reduces manufacturing costs, and improves signal transmission efficiency by using existing circuit board electrodes as antennas and achieving impedance matching without additional components.
Implementation Method 1
a loop electrode that is arranged on the circuit board so that the loop electrode is coupled to the radio frequency IC chip and the electrode
Data Source
AI summary
A radio frequency IC device includes a radio frequency IC chip arranged to process a transmitted/received signal, a printed circuit board on which the radio frequency IC chip is mounted, an electrode arrange on the circuit board, and a loop electrode that is arranged on the circuit board so that the loop electrode is electrically connected to the radio frequency IC chip and is coupled to the electrode by electromagnetic coupling. The electrode is coupled to the radio frequency IC chip via the loop electrode so as to transmit or receive a high-frequency signal. A power supply circuit board including a resonance circuit and/or a matching circuit may be disposed between the radio frequency IC chip and the loop electrode.