Overlapping Inductive Coil Layout for Interference-Free Two-Way Links
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Solution Overview
Problem
Existing wireless communication systems are not suitable for short distances due to near-field effects causing interference and dispersion of electromagnetic waves, making them unsuitable for applications like subsea communications where wired connections are not feasible.
Innovation Solution
An inductive communication unit with parallel and overlapping transmitter and receiver coils, where the overlapping portion induces a current of the same magnitude and opposite polarity as the nonoverlapping portion, minimizing interference and enabling two-way communication at short distances with low energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If electromagnetic waves are used for wireless communication, then communication distance can be extended, but near-field effects cause interference and dispersion at short distances
Solution Approach 1:
The patent replaces electromagnetic wave-based wireless communication with inductive communication using magnetic fields. This substitution eliminates near-field interference and dispersion problems by using a different physical mechanism (magnetic induction instead of electromagnetic radiation), enabling reliable short-distance communication without the harmful effects associated with traditional electromagnetic waves.
Solution Approach 2:
The patent changes the operating parameters by using low-frequency alternating magnetic fields instead of high-frequency electromagnetic waves. This parameter change allows the system to operate in the near-field regime without experiencing interference and dispersion, as the magnetic fields remain confined and do not radiate away, solving the short-distance communication problem.
2Length of stationary object
If transmitter and receiver coils are placed close for short-distance communication, then communication distance is reduced, but interference between coils increases
Solution Approach 1:
The patent employs asymmetric coil winding directions where the transmitter coil and receiver coil are wound in opposite directions. This asymmetry creates opposing magnetic polarities that cause interference currents to cancel each other out, eliminating the harmful interference that would normally occur when coils are placed close together for short-distance communication.
Solution Approach 2:
The patent converts the harmful interference effect into a beneficial cancellation effect. By designing the coils with opposite winding directions, the interference currents induced in each coil have opposite polarities and cancel each other out, transforming what would be a harmful interference into a useful signal purification mechanism that enables clear communication at short distances.
3Productivity
If two-way communication is implemented in the same frequency, then communication efficiency is improved, but interference between transmitting and receiving units occurs
Solution Approach 1:
The patent converts the harmful mutual interference that occurs during simultaneous two-way communication into a beneficial cancellation effect. By using opposite coil winding directions, the interference currents generated by each unit's transmitter in the other unit's receiver have opposite polarities and cancel out, enabling full-duplex communication in the same frequency without interference.
Solution Approach 2:
The patent changes the physical configuration parameter of the coils (winding direction) to create opposing magnetic polarities. This parameter change enables the system to achieve frequency-division multiplexing in the time domain, allowing simultaneous transmission and reception at the same frequency by spatially and magnetically separating the signals through opposite polarities.
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 allows for high information transfer rates in the same frequencies without interference, enabling multiple communication units to be positioned closely without interference, particularly suitable for subsea applications.
Implementation Method 1
a transmitter coil configured to generate a first alternating magnetic field representing first information to be transmitted, and a receiver coil configured to receive a second magnetic field representing second information to be received
Implementation Method 2
the overlapping portion of the receiver coil induces a first current and a nonoverlapping portion of the receiver coil induces a second current, wherein the first and the second currents are of same magnitude and opposite polarity
Data Source
AI summary
An inductive communication unit is for use in two-way communication. The unit has a transmitter coil configured to generate a first alternating magnetic field representing first information to be transmitted, and a receiver coil configured to receive a second magnetic field representing second information to be received. The transmitter coil and the receiver coil are arranged extending in parallel in vicinity to each other and positioned overlapping each other in part to an extent that, upon exposure of the first alternating magnetic field to the receiver coil, an overlapping portion of the receiver coil induces a first current and a nonoverlapping portion of the receiver coil induces a second current, and where the first and the second currents are of same magnitude and opposite polarity.