RFID Antenna Capacitor Integration for Power Storage
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Solution Overview
Problem
Conventional RFID devices often face energy insufficiency issues due to limited power storage capacity, which restricts their ability to transmit information to the RFID reader, especially in environments where signal strength is attenuated.
Innovation Solution
Integrating a high-capacity capacitor within the antenna area of the RFID device, aligned with the elongate conductive trace, to enhance power storage and minimize radio frequency interference, allowing for increased operational capacity and extended transmission periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional coupling capacitor is used in the IC, then the device structure is simple, but the power storage capacity is insufficient to transmit information reliably
Solution Approach 1:
The patent merges the capacitor with the antenna structure by integrating the capacitive element within the antenna area. The elongate capacitive structure is positioned adjacent to and parallel with the elongate conductive trace of the antenna, creating a combined antenna-capacitor assembly that increases power storage capacity while maintaining structural integration and avoiding additional separate components.
2Quantity of substance
If the capacitor is made larger to increase power storage, then the power capacity improves, but the capacitor interferes with radio frequency waves detected by the antenna
Solution Approach 1:
The patent applies local quality by creating an elongate capacitive structure with specific geometric properties that match the antenna's conductive trace. The capacitor is designed with a length-to-width ratio similar to the antenna trace, and is positioned at a specific distance away from it. This localized geometric configuration allows the capacitor to provide enhanced power storage while its elongated shape and positioning cause it to be hidden electromagnetically by the antenna trace, minimizing interference with RF wave detection.
Solution Approach 2:
The patent converts the potential harmful effect of the capacitor's presence in the antenna area into a beneficial outcome. By positioning the elongate capacitive structure adjacent to and parallel with the antenna trace, the antenna trace itself acts as a shield that hides the capacitor from RF waves. The capacitor's elongated geometry, which could potentially interfere with RF detection, is transformed into an advantage where the antenna trace provides electromagnetic shielding for the capacitor while both structures work together to enhance power storage and transmission capability.
3Quantity of substance
If the capacitor is positioned within the antenna area, then the power storage capacity increases, but the alignment precision required is high
Solution Approach 1:
The patent employs parameter changes by designing the capacitor and antenna with matching geometric parameters. Both the elongate capacitive structure and the elongate conductive trace are designed with similar length-to-width ratios and are positioned at a standardized distance from each other. This parameter matching simplifies the manufacturing alignment process, as the elongated shapes naturally guide the alignment during fabrication, reducing the precision requirements compared to compact or irregularly shaped capacitor-antenna configurations.
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 significantly increases the power storage capacity of RFID devices, enabling them to transmit more information and perform smart operations, even in challenging environments like liquids and containers, by embedding a high-capacity capacitor within the antenna area, thereby enhancing the device's operational efficiency and sustainability.
Implementation Method 1
The capacitor stores power within the antenna area
Implementation Method 2
The antenna receives a radio frequency signal from the RFID reader and converts the signal to DC power
Data Source
AI summary
A radio frequency identification (RFID) device and method of fabrication are presented. The RFID device includes an RFID antenna, a capacitor, and an RFID integrated circuit. The RFID antenna includes an elongate conductive trace disposed within an antenna area of the RFID device, and the capacitor includes an elongate capacitive structure for storing power. The elongate capacitive structure is aligned with the elongate conductive trace and embedded within the antenna area of the RFID device. The RFID integrated circuit is electrically coupled to the RFID antenna and to the capacitor, and the capacitor stores power within the antenna area of the RFID device to facilitate RFID integrated circuit functionality.