Multi-Region Antenna Layout for Cross-Polarized Wireless Tags
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Solution Overview
Problem
Existing image forming apparatuses face challenges in communicating with wireless tags due to differences in frequency bands and polarization planes, limiting their compatibility with various types of wireless tags used across different countries and regions.
Innovation Solution
A wireless tag communication device with an antenna having multiple radiation regions and a controller that emits polarized waves, allowing for communication with wireless tags by adjusting the radiation regions' lengths and orientations to match the tags' specific requirements, enabling compatibility with a wide range of wireless tag types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an antenna radiates radio waves in a particular frequency band and polarization plane, then communication with wireless tags of that specific type is achieved, but compatibility with wireless tags of different frequency bands and polarization planes is lost
Solution Approach 1:
The antenna is divided into multiple independent radiation elements, each capable of radiating radio waves at different frequencies and polarization planes. This segmentation allows the antenna system to communicate with various types of wireless tags by selectively activating appropriate radiation elements, thereby achieving multi-frequency and multi-polarization compatibility without requiring multiple separate antennas.
Solution Approach 2:
The antenna structure is designed to perform multiple functions simultaneously - it can radiate radio waves at different frequencies (e.g., 2.45 GHz and 5.8 GHz) and different polarization planes (vertical and horizontal) using the same physical antenna structure. This multi-functionality enables a single antenna to replace what would traditionally require multiple specialized antennas.
2Device complexity
If the antenna structure is simplified to reduce device complexity, then manufacturing and installation become easier, but the ability to communicate with various wireless tag types across different frequency bands and polarization planes is reduced
Solution Approach 1:
The antenna incorporates switching mechanisms that dynamically select which radiation elements are active based on the requirements of the wireless tag being communicated with. This dynamic configuration allows the antenna to adapt its frequency and polarization characteristics in real-time, ensuring reliable communication with different wireless tag types while maintaining a relatively simple physical structure.
Solution Approach 2:
The antenna system changes its operating parameters (frequency and polarization plane) by selectively activating different radiation elements through switching circuits. This parameter changing capability allows the same antenna structure to operate across multiple frequency bands and polarization modes, maintaining communication reliability without requiring complex multi-antenna configurations.
3Adaptability or versatility
If multiple radiation elements are added to support different frequency bands and polarization planes, then compatibility with various wireless tags is improved, but the antenna structure and device complexity increase
Solution Approach 1:
Multiple radiation elements that would traditionally require separate spatial arrangements are merged into a compact integrated antenna structure. The design combines vertical and horizontal radiation elements, as well as multiple frequency resonant elements, within a single antenna assembly, significantly reducing the space required compared to using separate antennas for each function.
Solution Approach 2:
The antenna structure employs a nested configuration where radiation elements are arranged in a space-efficient manner, with elements of different orientations and frequencies integrated within each other. This nesting approach allows multiple radiation elements to occupy minimal space while maintaining their individual radiation characteristics for different frequency bands and polarization planes.
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 enhances the probability of successful communication with wireless tags by radiating polarized waves that match the tags' polarization planes and frequencies, reducing the likelihood of communication errors and increasing compatibility across different tag types.
Implementation Method 1
The antenna radiates a radio wave that can be received the wireless tag
Implementation Method 2
the radio wave emitted from the antenna needs to have a polarization plane that matches a polarization plane that can be received by the wireless tag
Data Source
AI summary
A wireless tag communication device for communicating with a wireless tag conveyed in a conveyance direction includes an antenna with a plurality of radiation regions from which a polarized radio wave is emitted and including a first radiation region extending along a first direction crossing the conveyance direction and having a first length in the first direction, and a second radiation region extending parallel to the first radiation region and having a second length that is different from the first length in the first direction, and a controller configured to cause at least one of the first and second radiation regions to emit a polarized wave towards the wireless tag.