RFID Antenna Read Range via User Reflection
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Solution Overview
Problem
Indicia reading devices that integrate both barcode reading and RFID functionality face challenges in meeting size requirements due to the need for directional performance of RFID antennas, resulting in limited read range and poor control of radiation patterns.
Innovation Solution
The device includes an imaging assembly, an antenna assembly with a transceiver, and a controller that determines the operating mode (handheld or presentation) to adjust the transmit power of the antenna element, increasing the forward read range by reflecting backward energy off the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If RFID antenna size is increased to improve read range, then read range is improved, but device size increases and compactness is lost
Solution Approach 1:
The system dynamically adjusts antenna operating parameters based on detected mode (handheld vs. presentation). In handheld mode, the antenna operates at higher power with modified radiation characteristics to achieve extended read range. In presentation mode, the antenna returns to conventional directional operation. This dynamic adaptation allows the same physical antenna to provide different performance characteristics without changing its physical size.
Solution Approach 2:
The patent changes operational parameters of the antenna system, specifically transmit power and radiation pattern characteristics, based on the operating mode. By adjusting these parameters, the system achieves extended read range in handheld mode without requiring a physically larger antenna, thus resolving the contradiction between read range and device compactness.
2Length of stationary object
If antenna transmit power is increased to improve read range, then read range is improved, but backward energy increases causing interference
Solution Approach 1:
The system dynamically adjusts antenna operating parameters based on detected mode (handheld vs. presentation). In handheld mode, the antenna operates at higher power with modified radiation characteristics to achieve extended read range. In presentation mode, the antenna returns to conventional directional operation. This dynamic adaptation allows the same physical antenna to provide different performance characteristics without changing its physical size.
Solution Approach 2:
The system exploits the user's body as a reflective surface to convert backward energy into a beneficial effect. By increasing transmit power in handheld mode, the antenna generates backward energy that reflects off the user's body forward toward the target area, effectively extending the read range. This transforms what would normally be harmful interference into a useful signal enhancement.
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 solution enhances the read range of the device while maintaining a compact form, effectively addressing the size and performance limitations of integrated RFID and barcode reading devices.
Implementation Method 1
increases a forward read range of the device by reflecting RF energy emitted from the antenna element off of a user
Data Source
AI summary
A RFID-integrated indicia reading device and methods with increased read range via mode detection is provided. The device comprises an imaging assembly configured to capture two-dimensional image data appearing in a first field of view; an antenna assembly including at least one antenna element, being arranged proximate to the imaging assembly within a housing; and, a controller, coupled to the imaging and antenna assemblies, configured to determine a presentation operating mode of the device and a handheld operating mode of the device. The presentation operating mode is indicative of the device being positioned in a cradle, and the handheld operating mode is indicative of the device being held by and positioned in front of a user. The controller, in response to determining the device is in handheld operating mode, increases a transmit power of the antenna element, which generates backward energy that reflects from the user and increases a forward read range of the device.