Antenna Ground Plate Rectangular Opening Backward Radiation Suppression
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Solution Overview
Problem
Existing systems that combine merchandise registration or inventory management using both code symbols and wireless tags require operators to switch between optical readers and wireless tag readers, which can be cumbersome, and existing antenna apparatuses with rectangular openings hinder the reading of code symbols while failing to suppress backward radiation of radio waves.
Innovation Solution
An antenna apparatus with a grounded rectangular opening and conductive members that cover the entire perimeter of the opening, ensuring that radio waves are not radiated backward without obstructing the optical reader's light path, utilizing a substrate with radiation elements and a conductive member to maintain the functionality of both optical and wireless tag reading systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a rectangular opening is provided at the central portion of the substrate to allow optical reader access, then light transmission is enabled, but backward radiation of radio waves occurs
Solution Approach 1:
The conductive member is divided into multiple segments (first conductive member and second conductive member) that are positioned at different locations around the opening. These segmented conductive elements work together to suppress backward radiation while maintaining light transmission through the opening, resolving the contradiction between optical access and radio wave containment.
Solution Approach 2:
The conductive members are strategically positioned at specific locations around the opening rather than covering the entire substrate. This localized placement allows light to pass through the opening while the conductive members at critical positions suppress backward radiation, achieving both objectives simultaneously.
2Reliability
If the antenna apparatus is designed to suppress backward radiation, then the front-to-back ratio is enhanced, but the structure becomes more complex
Solution Approach 1:
The conductive members serve multiple functions: they act as part of the antenna structure for wireless tag reading, simultaneously suppress backward radiation to enhance the front-to-back ratio, and do not obstruct light transmission. This multi-functionality improves reliability without proportionally increasing complexity.
Solution Approach 2:
The conductive members are integrated into the substrate structure and work passively to suppress backward radiation through their geometric arrangement and electrical connection to ground, without requiring additional active components or complex control mechanisms.
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 antenna apparatus effectively suppresses backward radiation of radio waves, enhancing the front-to-back ratio and preventing interference from unwanted sources, allowing for seamless operation of both optical and wireless tag reading systems without hindering light transmission.
Implementation Method 1
an antenna apparatus which does not hinder reading of the code symbol by an optical reader has been devised
Implementation Method 2
An antenna apparatus with a rectangular opening provided at a central portion of a substrate. On the substrate, four elements of an antenna are disposed in a rectangular shape.
Implementation Method 3
An optical reader can read a code symbol through the opening
Data Source
AI summary
According to one embodiment, an antenna apparatus includes a ground plate having an opening, a ground layer on a first side of the ground plate, an antenna on the first side of the ground plate and connected to the ground layer, the antenna being disposed around the opening, and a conductive member on the first side of the ground plate to contact an outer perimeter of the opening. The conductive member is electrically connected to the ground layer.