RFID Tag Antenna Using Zeroth-Order Resonator for Miniaturization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional RFID tag antennas are difficult to miniaturize for integration into small-scale electronic products due to interference from external noise and the need for impedance matching, which limits their size reduction.
Innovation Solution
The RFID tag antenna design features a substrate with a feeding structure and a rotation structure forming a resonant circuit, allowing for size reduction by adjusting the gap, length, and width of the rotation structure to achieve impedance matching and resonance without relying on physical length, utilizing a Zeroth-Order Resonator concept.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional RFID tag antenna uses a small-scale couple loop for impedance matching, then the input impedance can be matched to the chip, but the antenna size cannot be reduced further and it becomes susceptible to external noise interference
Solution Approach 1:
The patent changes the fundamental operating parameters of the antenna by transitioning from a conventional small-scale couple loop to a Zeroth-Order Resonator (ZOR) structure. This parameter change allows the antenna to achieve impedance matching through a different mechanism that does not require the antenna to be electrically small, thereby maintaining reliability while reducing susceptibility to external noise interference.
Solution Approach 2:
The patent introduces a new dimensional approach by using a resonant circuit structure that operates at resonance frequency rather than relying on the physical length being a fraction of the wavelength. This dimensional change in the operating principle allows the antenna to achieve the same impedance matching function without being constrained by the traditional size limitations.
2Area of moving object
If the antenna body size is reduced for small-scale electronic products, then integration into compact devices becomes possible, but impedance matching becomes difficult to achieve
Solution Approach 1:
The patent applies parameter changes by using a ZOR structure where the resonant frequency is determined by the LC circuit parameters rather than the physical dimensions being a fraction of the wavelength. This allows the antenna to maintain proper impedance matching while occupying a much smaller area suitable for compact electronic products.
Solution Approach 2:
The patent segments the antenna function into a feeding structure and a rotation structure that form a resonant circuit. This segmentation allows the antenna to achieve impedance matching through the resonant circuit's LC parameters independent of the overall antenna area, enabling miniaturization while maintaining matching reliability.
3Reliability
If a small-scale couple loop is used for impedance matching, then the capacitive reactance of the chip can be eliminated, but the antenna becomes barely having any radiation function
Solution Approach 1:
The patent changes the operating principle from relying on electrically small dimensions to using a resonant circuit at resonance frequency. This parameter change allows the antenna to simultaneously achieve conjugate matching (eliminating chip capacitive reactance) and maintain strong radiation function through the resonant oscillation of the LC circuit.
Solution Approach 2:
The patent applies the concept of resonance (analogous to mechanical vibration) by designing the antenna to operate at its resonant frequency where the LC circuit oscillates with maximum amplitude. This resonant oscillation ensures both proper impedance matching and strong radiation capability, eliminating the trade-off present in conventional small-scale designs.
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 enables the creation of a compact RFID tag antenna that effectively operates in the UHF or microwave band, reducing design area requirements and facilitating integration into printed circuit boards, while maintaining efficient information transmission.
Implementation Method 1
a feeding structure (301), mounted on the first surface (300a); and a rotation structure (302), mounted on the second surface (300b); wherein the feeding structure (301) corresponds to the rotation structure (302) for forming a resonant circuit
Data Source
AI summary
The present disclosure relates to a radio frequency identification (RFID) tag antenna. The RFID tag antenna includes: a substrate having a first surface and a second surface, a feeding structure mounting on the first surface and a rotation structure mounting on the second surface. Specifically, the feeding structure corresponds to the rotation structure for forming a resonant circuit.