RFID Tag Antenna Layout for Isotropic Radiation With One IC Chip
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Solution Overview
Problem
Existing RFID tags with isotropic radiation patterns, like those using two perpendicular dipole antennas, are costly due to the need for expensive IC chips capable of connecting to multiple antennas.
Innovation Solution
An RFID tag design featuring a single antenna with a split-ring resonator portion and impedance matching portion on an insulating base, allowing for an isotropic radiation pattern without the need for expensive IC chips, using a single, inexpensive IC chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If two perpendicular dipole antennas are used to achieve isotropic radiation pattern, then radiation isotropy is improved, but device complexity and cost increase due to requiring expensive IC chips capable of connecting to multiple antennas
Solution Approach 1:
The single antenna is segmented into two functional parts: a split-ring resonator portion and an impedance matching portion. The split-ring resonator portion includes two parts with facing portions that create capacitive coupling, enabling the single antenna to achieve isotropic radiation pattern through its geometric configuration rather than requiring multiple separate antennas.
Solution Approach 2:
The single antenna structure serves multiple functions: it provides both the resonating element and the impedance matching function through its integrated design. The impedance matching portion connects to the IC chip while the split-ring resonator portion generates the isotropic radiation pattern, making one antenna perform the work of multiple antennas.
2Stability of the object's composition
If two perpendicular dipole antennas are used to achieve isotropic radiation pattern, then radiation isotropy is improved, but manufacturing cost increases due to expensive IC chips
Solution Approach 1:
The invention enables the use of inexpensive IC chips by eliminating the requirement for expensive multi-antenna connection capabilities. The single antenna design with split-ring resonator and impedance matching portions allows standard, low-cost IC chips to be used, significantly reducing manufacturing cost while maintaining isotropic radiation performance.
3Device complexity
If a single antenna is used instead of two perpendicular dipole antennas, then device complexity and cost are reduced, but achieving isotropic radiation pattern becomes more difficult
Solution Approach 1:
Different portions of the single antenna are given different local qualities and functions. The split-ring resonator portion is designed with specific geometric properties to generate isotropic radiation, while the impedance matching portion is optimized for electrical connection to the IC chip. The facing portions within the split-ring structure create localized capacitive effects that contribute to the overall isotropic pattern.
Solution Approach 2:
The invention achieves isotropic radiation from a single antenna by carefully controlling geometric parameters: the dimensions of the split-ring resonator, the spacing between facing portions, and the configuration of the impedance matching portion. By optimizing these parameters, the antenna produces the desired radiation characteristics without requiring complex multi-antenna systems.
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 design achieves an isotropic radiation pattern with a single antenna, reducing the cost of the RFID tag by enabling the use of less expensive IC chips while maintaining effective radio communication capabilities.
Implementation Method 1
The first facing portion and the second facing portions are apart from and face each other
Implementation Method 2
The antenna portion has a split-ring resonator portion
Implementation Method 3
The antenna portion has an impedance matching portion
Data Source
AI summary
An RFID tag is provided with a base member, an antenna portion and an IC chip. A split-ring resonator portion of the antenna portion has a first part and a second part. First end portions of the first part are provided with a first facing portion and a first connection portion, respectively. Second end portions of the second part are provided with a second facing portion and a second connection portion, respectively. The first and the second facing portions are apart from and face each other. A third end portion of the impedance matching portion is connected to the first part between the first facing portion and the first connection portion, and another third end portion is connected to the second part between the second facing portion and the second connection portion. The IC chip is connected to the first connection portion and the second connection portion.