Antenna Circuit Offsets EMI Without Signal Degradation
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Solution Overview
Problem
Existing electronic circuit designs face challenges in reducing electromagnetic interference (EMI) without degrading signal quality, as conventional methods like passive filtering, spread spectrum generation, and shielding often result in trade-offs between EMI reduction and system functionality.
Innovation Solution
Incorporating a dedicated antenna circuit that generates an antenna signal to offset EMI emissions, using a combination of antenna signal generation and antenna arrays to manipulate electromagnetic radiation patterns, allowing for EMI reduction without impacting signal quality or functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If passive filtering is used to remove higher frequency harmonics, then EMI is reduced, but signal integrity is degraded
Solution Approach 1:
The patent uses the harmful EMI radiation as a basis to generate a beneficial counteracting signal. The antenna circuit captures the EMI-emitting signal and generates an opposing phase signal that cancels the harmful radiation, converting the harmful EMI into a useful cancellation mechanism without degrading the original signal integrity
Solution Approach 2:
The antenna circuit serves as an intermediary element between the EMI source and the environment. It receives the EMI signal, processes it through phase inversion, and emits the cancelled signal back, acting as a mediator that eliminates harmful radiation while preserving the original signal's integrity
2Object-generated harmful factors
If spread spectrum generation is used to reduce EMI, then EMI emissions are reduced, but system functionality is compromised due to frequency deviation limits
Solution Approach 1:
Instead of modifying the operational signal to reduce EMI (which would affect functionality), the patent converts the harmful EMI radiation into a useful resource by using it to generate the cancellation signal. This approach reduces EMI without any frequency deviation or impact on system functionality
Solution Approach 2:
The patent separates the EMI reduction function from the signal processing function. The antenna circuit handles EMI cancellation independently while the operational circuit maintains its original functionality, allowing both objectives to be achieved without compromise
3Object-generated harmful factors
If shielding is used to contain electromagnetic waves, then EMI is reduced, but physical space and device complexity increase
Solution Approach 1:
The patent extracts the EMI cancellation function from the physical shielding structure. Instead of using metal and dielectric cases to contain electromagnetic waves, the invention uses an antenna circuit to actively generate opposing signals, eliminating the need for bulky shielding structures and reducing device complexity
Solution Approach 2:
The patent replaces the mechanical shielding approach (metal and dielectric cases) with an electronic/electromagnetic approach (antenna circuit generating opposing phase signals). This substitution eliminates the need for physical shielding structures while achieving the same EMI reduction effect
4Reliability
If differential signaling is used to preserve signal integrity, then signal quality is maintained, but EMI reduction is limited due to common node noise
Solution Approach 1:
The patent converts the common node noise in differential systems into a useful signal for EMI cancellation. By capturing and inverting the differential signal in the antenna circuit, the system generates an opposing phase signal that cancels EMI emissions while preserving signal integrity through the differential signaling mechanism
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
Effectively mitigates EMI emissions by generating offsetting electromagnetic radiation, allowing for compliance with frequency regulations without degrading signal integrity or reducing system functionality, and can be applied to both single-ended and differential signaling systems.
Implementation Method 1
The antenna signal has the characteristic such that when the antenna signal is applied to the antenna circuit, the resultant emitted electromagnetic radiation at least partially offsets electromagnetic interference emitted by the operational signal from the functional circuit
Data Source
AI summary
An electronic system that partially or perhaps even fully mitigates the effects of EMI by having a dedicated antenna circuit for carrying an antenna signal that is not used for signal processing in the functional circuit, but is instead used to emit electromagnetic radiation that at least partially offsets EMI emitted by the operation signal of a functional circuit. An antenna signal generation circuit generates the antenna signal and asserts the antenna signal on the antenna circuit. The ante a signal has the characteristic such that when the antenna signal is applied to the antenna circuit, the resultant emitted electromagnetic radiation at least partially offsets electromagnetic interference emitted by the functional circuit.