Dual Dipole Antenna for RFID Reader Wide Area Coverage
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Solution Overview
Problem
Conventional patch antennas used in reader devices for RFID tags have limited directional directivity, requiring multiple antennas to cover a wide area, leading to increased device size and cost, while also being complex in structure.
Innovation Solution
A reader device with a dual dipole antenna configuration, where the first dipole antenna has a first element axis extending in one direction and the second dipole antenna has a second element axis crossing the first direction, creating a wider readable area by utilizing a donut-shaped radiation pattern with each axis as the center, and a time division high frequency signal supply mechanism to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a patch antenna is used as the antenna element, then the structure is simple and cost is low, but the readable area is limited due to unidirectional directivity
Solution Approach 1:
The patent combines multiple dipole antennas (first and second dipole antennas) into a single antenna element assembly. This merging approach achieves wide-area coverage by integrating the radiation patterns of multiple antennas, resolving the contradiction between limited readable area and complex device structure.
Solution Approach 2:
The patent introduces orthogonal spatial dimensions by arranging dipole antennas in different orientations (first and second directions). This dimensional approach expands the readable area from a single-direction pattern to a three-dimensional coverage pattern, eliminating the need for multiple reader devices.
2Area of stationary object
If multiple patch antennas are arranged dispersedly to cover the entire surface, then the readable area is widened, but the device size and cost increase
Solution Approach 1:
The patent merges multiple antenna functions into a single integrated antenna element assembly containing first and second dipole antennas. This consolidation achieves the readable area coverage of multiple dispersed antennas while maintaining a compact device size, avoiding the need to increase the reader device dimensions.
Solution Approach 2:
The antenna element assembly performs multiple radiation functions simultaneously through orthogonally arranged dipole antennas, making it a universal solution that provides omnidirectional coverage equivalent to multiple separate antennas while occupying the space of a single antenna unit.
3Area of stationary object
If multiple reader devices are provided to cover the entire surface, then the readable area is widened, but the cost and system complexity increase
Solution Approach 1:
The patent makes a single reader device universal by equipping it with an antenna element assembly that provides omnidirectional radiation capability. This allows one reader device to replace multiple reader devices, achieving full surface coverage while reducing the quantity of equipment needed.
Solution Approach 2:
The patent combines the functional capabilities of multiple reader devices into a single unit by integrating multiple dipole antenna radiation patterns. This merging eliminates the need for multiple separate reader devices while maintaining comprehensive coverage of the entire surface.
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 dual dipole antenna configuration enhances the readable area without the need for multiple devices, reducing costs and improving reading sensitivity by optimizing the supply of high frequency signals based on the number of RFID tags detected.
Implementation Method 1
an antenna element communicating with an RFID tag attached to an article... the antenna element includes a first dipole antenna having a first element axis extending in a first direction; and a second dipole antenna having a second element axis extending in a second direction crossing the first direction
Data Source
AI summary
A reader device is provided having a wider readable area and a table with the reader device. The reader device includes an antenna element communicating with an RFID tag attached to an article, a reader module electrically connected to the antenna element and reading information of the RFID tag through the antenna element, and a case housing the antenna element and the reader module. Moreover, the antenna element includes a first dipole antenna having a first element axis extending in a first direction, and a second dipole antenna having a second element axis extending in a second direction crossing the first direction.