RFID Tag Antenna Compensation Structure for Metal Mounting
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Solution Overview
Problem
RFID tags experience reduced communication distance and performance when mounted on metallic objects due to interference, and existing micro-strip antenna designs compromise effective radiating area for impedance matching and resonance adjustment, limiting communication distance and bandwidth.
Innovation Solution
An RFID tag antenna with a compensation structure featuring a dielectric substrate, conductor grounding and radiation parts, feeding lines, and conductor compensation parts arranged on side faces to enhance impedance matching and resonance adjustment without altering tag size or material, improving communication distance and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If notches are formed on the radiating part to form impedance match network and resonance adjustment structure, then impedance matching and resonance frequency adjustment are improved, but the effective radiating area is reduced
Solution Approach 1:
The patent moves the impedance matching and resonance adjustment functions from the radiating surface (2D plane) to the side surface (3D dimension) of the antenna. By forming the matching network and resonance structure on the side surface rather than cutting notches into the radiating part, the effective radiating area on the main surface is preserved while still achieving the necessary electrical performance adjustments.
Solution Approach 2:
The patent separates the antenna into distinct functional regions: the radiating part on the front surface dedicated to radiation, and the matching network on the side surface dedicated to impedance adjustment. This segmentation allows each part to optimize its specific function without compromising the other, particularly preserving the radiating area while providing impedance matching capability.
2Reliability
If notches are formed on the radiating part to form impedance match network and resonance adjustment structure, then resonance frequency adjustment is improved, but the effective radiating area is reduced
Solution Approach 1:
The patent relocates the resonance adjustment structure from the radiating surface to the side surface of the antenna. This dimensional relocation allows the resonance frequency to be adjusted through the configuration of conductive patterns on the side surface, eliminating the need to reduce the radiating area on the front surface for resonance control.
Solution Approach 2:
The patent divides the antenna structure into a radiating section on the front surface and a control section on the side surface. The resonance adjustment functionality is assigned to the side surface conductive patterns, allowing independent optimization of radiating area and resonance characteristics without mutual interference.
3Adaptability or versatility
If the RFID tag is mounted on metal surface, then the application scope is expanded, but the communication distance decreases obviously
Solution Approach 1:
The patent introduces a dielectric substrate as an intermediary layer between the antenna and the metal surface. This dielectric layer acts as a mediator that reduces the harmful interaction between the antenna and the conductive metal surface, thereby maintaining communication distance while still allowing the tag to be mounted on metal objects. The dielectric substrate isolates the antenna from direct contact with the metal, reducing signal loss and interference.
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
The compensation structure effectively increases communication distance and bandwidth performance while maintaining miniaturization and production efficiency, with symmetrical conductor compensation parts ensuring uniform current distribution and improved antenna performance.
Implementation Method 1
a structure that is used to adjust resonance frequency of the micro-strip antenna
Implementation Method 2
the RFID tag antenna... can be put close to metallic object to carry out wireless communication
Data Source
Figure 1~4
Figure 5~6(b)
Figure 7(a)~9
AI summary
The invention claims a Radio Frequency Identification (RFID) tag antenna with a compensation structure, an RFID tag and an RFID system. The RFID tag antenna comprises: a dielectric substrate (3); a conductor grounding part (2) which is arranged in the way of covering the whole surface of one main surface of the dielectric substrate (3); a conductor radiation part (4) which is arranged in the way of covering the whole surface of the other main surface of the dielectric substrate (3); a feeding part (5) which is arranged on one end face in the length direction of the dielectric substrate (3) and provided with a first feed line (51) and a second feed line (52), wherein the first feed line (51) and the second feed line (52) are respectively electrically connected with the conductor grounding part (2) and the conductor radiation part (4); and a conductor compensation part (7) which is arranged on at least one of the two side faces in parallel with the length direction of the dielectric substrate (3), wherein the conductor grounding part (2) and the conductor radiation part (4) are electrically connected through the conductor compensation part (7).