RFID Tag Antenna Layout for Ground Plane Spacing
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Solution Overview
Problem
Existing RFID tags face challenges in achieving optimal antenna gain and uniform radiation characteristics due to the placement of ground planes relative to antenna conductors, leading to reduced performance in specific directions and overlapping issues with functional modules.
Innovation Solution
The RFID tag design features a circuit board with an extended part and antenna conductor that are longer than one edge of the main part, positioned to keep the ends of the antenna conductor away from the ground plane, and functional modules are arranged to prevent overlap with the antenna, allowing for improved antenna gain and suitable radiation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the antenna conductor is placed close to the ground plane to reduce device size, then the device complexity is reduced, but the antenna gain and radiation characteristics deteriorate
Solution Approach 1:
The patent extends the antenna conductor in the planar dimension rather than vertically, achieving proper antenna radiation characteristics without increasing device height. The extended part of the circuit board allows the antenna conductor to extend beyond the main body in a horizontal direction, maintaining adequate spacing from the ground plane while keeping the overall device footprint compact.
Solution Approach 2:
The circuit board is divided into a main body and an extended part, with the antenna conductor strategically placed on the extended part. This segmentation allows the antenna conductor to be positioned away from the ground plane on the main body, improving radiation characteristics while keeping the main device body compact.
2Area of stationary object
If functional modules are placed to minimize device area, then the area of the device is reduced, but the antenna radiation characteristics worsen due to overlap
Solution Approach 1:
Functional modules are arranged in the vertical dimension (stacking) rather than only in the planar dimension. This allows the antenna conductor to extend in the horizontal direction on the extended circuit board part without overlapping with functional modules, maintaining omnidirectional radiation characteristics while minimizing overall device area.
Solution Approach 2:
The circuit board has an asymmetric structure with an extended part that protrudes in a specific direction. This asymmetric design allows the antenna conductor to extend beyond the main body without overlapping functional modules, achieving proper radiation characteristics while keeping the device area compact through strategic spatial arrangement.
3Reliability
If the antenna conductor extends beyond the main body to improve radiation, then the antenna gain improves, but the device complexity increases
Solution Approach 1:
The extended part of the circuit board serves dual functions: it extends the antenna conductor for improved radiation characteristics and provides mounting space for functional modules. By merging the antenna extension function with the structural support function, the patent avoids adding separate components, thus improving antenna gain without significantly increasing device complexity.
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 configuration enhances antenna gain, particularly in the Z direction, and provides omnidirectional antenna characteristics, effectively addressing the limitations of previous designs by maintaining effective spacing for functional modules like photovoltaic panels and displays.
Implementation Method 1
an extended part including the antenna conductor and integrated with the main part, wherein the extended part and the antenna conductor are longer than one edge of the main part and disposed along the one edge
Data Source
AI summary
An RFID tag includes a circuit board and a plurality of functional modules. The circuit board has an antenna conductor and a ground plane. On the circuit board, a control circuit and an RFID IC are mounted. The functional modules are connected to the circuit board. The circuit board includes a main part and an extended part. The main part includes a mounting plane for the control circuit and the ground plane. The extended part includes the antenna conductor and is integrated with the main part. The extended part and the antenna conductor are longer than one edge of the main part and disposed along the one edge.