Multi-band RFID Antenna with On-chip and External Elements
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Solution Overview
Problem
Existing RFID antennas are limited to a unique operating frequency band, making them unsuitable for diversified applications and hindering the development of multi-system integrated RFID technology.
Innovation Solution
A multi-system multi-band RFID antenna is designed, comprising an on-chip antenna and external antennas connected via pads, allowing for selection of different frequency bands to meet various application requirements, with the on-chip antenna operating in high frequency, ultrahigh frequency, or microwave bands and external antennas operating in low frequency, high frequency, ultrahigh frequency, or microwave bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an RFID antenna is designed for a single frequency band, then the antenna design is simple and cost-effective, but the antenna cannot meet diversified application requirements across multiple frequency bands
Solution Approach 1:
The patent implements a single RFID antenna structure that can operate across multiple frequency bands (LF, HF, UHF, and microwave bands) by incorporating frequency-selective networks and switching mechanisms. The antenna system can be configured to function as different types of antennas (dipole, patch, helical, or planar inverted-F) depending on the selected frequency band, thereby achieving multi-functionality and eliminating the need for separate antennas for each frequency band
Solution Approach 2:
The patent employs switching mechanisms that dynamically reconfigure the antenna structure based on the required frequency band. The antenna impedance and physical configuration can be changed in real-time through switching between different operational modes, allowing the same antenna to adapt its characteristics to match different frequency requirements without physical replacement or manual reconfiguration
2Reliability
If separate antennas are used for each frequency band, then each antenna can be optimized for its specific band, but the overall system complexity and cost increase
Solution Approach 1:
The patent combines multiple frequency band capabilities into a single antenna structure by integrating frequency-selective networks, impedance matching circuits, and switching mechanisms. This merging approach allows the antenna to maintain optimized performance for each frequency band while using only one physical antenna structure, thereby reducing the total number of components and simplifying the overall system architecture
3Adaptability or versatility
If the RFID system needs to support multiple systems and bands, then application versatility improves, but the antenna design and fabrication difficulty increases
Solution Approach 1:
The patent divides the antenna structure into distinct functional segments including frequency-selective networks, impedance matching sections, and radiating elements. Each segment can be independently designed and optimized for specific frequency bands, and the segments are connected through switching mechanisms. This segmentation allows for modular fabrication processes and simplifies the overall manufacturing complexity while maintaining multi-band capability
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 solution enables RFID chips to provide appropriate antennas for different frequency bands, facilitating multi-system integration and adapting to both short and long distance identification applications.
Implementation Method 1
At the specified operating frequency, the coil antenna may produce resonance when the inductive impedance equals to the capacitive impedance
Implementation Method 2
All of the energy required by the tag is obtained in an inductive coupling manner in the near field radiated by a coupling coil of the reader
Implementation Method 3
Such a current distribution will excite an electromagnetic field in the space around the antenna
Implementation Method 4
The Poynting vector is a real number, and the electromagnetic field radiates energy in the form of electromagnetic wave
Data Source
AI summary
The present invention provides a multi-system multi-band RFID antenna, which comprises an on-chip antenna and at least one external antenna, wherein the on-chip antenna is arranged on RFID chip; the external antennas are arranged outside the RFID chip; and the RFID chip is provided with connection pads on the outer surface, wherein both the on-chip antenna and the external antennas are connected with the RFID chip through the connection pads. According to the multi-system multi-band RFID antenna of the present invention, the RFID chip can provide appropriate antennas for applications in different systems with different frequency bands, and can satisfactorily meet the need for RFID multi-system integration applications in the future.