Cross-Connected Loop Antennas for Wireless Mobile Body Control
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Solution Overview
Problem
Conventional mobile body remote control systems face communication quality issues due to interference from undesired electromagnetic waves emitted by other devices, which can lead to poor signal reception and potential system failure, especially in environments with strong electromagnetic interference.
Innovation Solution
The system employs a coupling device with a pair of cross-connected electrostatically shielded loop antennas, positioned close to a balanced feeder line, to enhance the desired-to-undesired signal ratio (D/U ratio) and reduce interference by using a weak electric field for communication, thereby minimizing spurious wave emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional inductive magnetic field coupling is used for communication between the guideway and mobile body, then communication can be established at close proximity, but the system is susceptible to interference from undesired electromagnetic waves emitted by other devices
Solution Approach 1:
The coupling device is divided into two separate loop antennas instead of using a single antenna. This segmentation allows the system to distinguish between desired signals from the guideway and undesired waves from other sources, improving communication reliability by selectively processing signals from different spatial directions
Solution Approach 2:
The two loop antennas are positioned at different locations and orientations relative to the guideway. Each antenna has different sensitivity characteristics to electromagnetic waves from different directions, allowing the system to exploit local quality differences to reject undesired waves while maintaining reception of desired signals
2Reliability
If strong electromagnetic fields are used for communication, then signal strength is sufficient, but spurious waves are emitted that can disturb other devices and violate regulatory standards
Solution Approach 1:
The system converts the potential harm of electromagnetic radiation into a benefit by using the directional sensitivity of two loop antennas to selectively receive desired signals while naturally rejecting undesired waves. This allows communication to be maintained with lower transmission power, reducing spurious wave emission while still achieving reliable signal reception
Solution Approach 2:
The system changes the operational parameters by using two loop antennas with different orientations and positions, creating a differential reception pattern. This parameter change allows the system to achieve sufficient signal-to-noise ratio without requiring high transmission power, thereby reducing electromagnetic radiation to compliant levels
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 configuration ensures reliable communication quality by increasing the D/U ratio, reducing interference from undesired waves, and allowing operation with low power emission, compliant with regulatory standards, thus preventing disturbances to other devices.
Implementation Method 1
an antenna (i.e., a coupling device) for noncontact wireless communications through electromagnetic induction coupling between the mobile body and a guideway arranged in a factory or warehouse
Implementation Method 2
communications are made mainly through inductive magnetic field coupling
Data Source
AI summary
A system that remotely controls a mobile body includes a guideway (i.e., balanced feeder line) for guiding the mobile body to its destination, and a coupling device provided on the mobile body for transmitting and receiving control information to control movement of the mobile body along the guideway. The coupling device includes a first loop antenna and a second loop antenna that are cross-connected to each other. A distance from the center of the balanced feeder line to the center of the first loop antenna is less than a distance from the center of the balanced feeder line to the center of the second loop antenna. The system can operate with an extremely low power of emission with a weak electric field intensity of a radio wave for controlling the movement of the mobile body.