Linked Antenna Pair for Wireless Monitoring in Shielded Containers
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Solution Overview
Problem
The electromagnetic shielding provided by vacuum insulation panels in temperature-controlled shipping containers severely attenuates wireless signal transmission, making it impossible to remotely monitor conditions inside the container without opening it, especially when containers are stacked.
Innovation Solution
A linked antenna pair is introduced, comprising a first antenna inside the container and a second antenna outside, connected by a feed line, which acts as a passive repeater to facilitate bi-directional signal transmission through the container's seams, allowing remote monitoring of conditions within the container.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vacuum insulation panels with metallized films are used to provide electromagnetic shielding and thermal insulation, then electromagnetic shielding effectiveness is improved, but wireless signal transmission is severely attenuated
Solution Approach 1:
The patent introduces a wired antenna system as an intermediary to bridge the signal transmission gap. The first antenna inside the container and second antenna outside, connected by a feed line, act as a mediator that transfers signals through the shielded boundary without compromising the vacuum insulation panels' electromagnetic shielding effectiveness. This resolves the contradiction by providing an alternative signal path that doesn't rely on wireless penetration through the shield.
2Productivity
If containers are stacked adjacent to or on top of each other, then space utilization is improved, but signal attenuation is further increased
Solution Approach 1:
The patent replaces the wireless mechanical/electromagnetic signal transmission system with a wired antenna system. The feed line provides a physical conduit for signal transmission that is independent of external electromagnetic interference or stacking conditions. This substitution eliminates the signal attenuation problem caused by container stacking while maintaining space utilization efficiency.
3Temperature
If tight seams between vacuum insulation panels are used to provide good thermal insulation, then thermal insulation performance is improved, but signal transmission paths are blocked
Solution Approach 1:
The patent segments the signal transmission path from the thermal insulation structure. Instead of relying on seams between vacuum insulation panels for signal transmission, the system uses dedicated antenna elements and feed lines that are separately integrated into the container structure. This segmentation allows tight seams to maintain thermal insulation performance while the antenna system provides independent signal transmission capability.
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 enables reliable wireless communication between devices inside the container and readers outside, overcoming signal attenuation and allowing for remote monitoring of temperature, humidity, and other parameters without opening the container, even when stacked.
Implementation Method 1
a feed line electrically connecting the first antenna to the second antenna
Implementation Method 2
The metallized films of the vacuum insulation panels 131-136 also provide electromagnetic shielding, so that insulating body 130 and insulating cover 136 form an electromagnetically shielding assembly
Implementation Method 3
Vacuum insulation panels are a preferred insulating material for both the insulating body 130 and the insulating cover 136 for extended duration temperature control because of their excellent thermal insulating properties
Data Source
AI summary
The present disclosure provides a linked antenna pair for a shipping container having a thermally insulated and electromagnetically shielded cavity for holding a payload. The linked antenna pair comprises a first antenna disposed inside the cavity, a second antenna disposed outside the cavity, and a feed line that electrically connects the first antenna to the second antenna.