Antenna Ground Path Switching to Limit PCB Signal Interference
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Solution Overview
Problem
As the number of antennas in electronic devices increases, the reduced distances between components and antennas lead to signal radiation affecting adjacent components, causing malfunctions such as camera reboots or frame capture failures, and deteriorating communication quality due to increased current density.
Innovation Solution
The electronic device includes a switch that electrically connects the antenna to different ground paths on multiple layers of a printed circuit board, controlled by a communication processor to manage signal routing based on component activation and elapsed time, reducing current density and preventing component malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas is increased to achieve higher transmission or reception rates, then communication performance is improved, but the distance between components and antennas is reduced causing signal radiation to affect adjacent components
Solution Approach 1:
The patent divides the ground connection into multiple separate paths (first ground path and second ground path) connected to different reference potentials. This segmentation allows differential signaling to be implemented, where the signal is transmitted as a voltage difference between two paths rather than relative to a single ground, thereby reducing the impact of ground noise and signal radiation on adjacent components.
Solution Approach 2:
The patent introduces a differential signaling mechanism as an intermediary between the antenna and adjacent components. By using differential pairs and reference potentials instead of single-ended signaling, the system mediates the signal transmission in a way that reduces electromagnetic interference and ground noise coupling to adjacent components.
2Device complexity
If the distance between components and antennas is reduced, then device integration is improved, but current density increases causing malfunctions such as camera reboots or frame capture failures
Solution Approach 1:
The ground connection is segmented into multiple paths with different reference potentials, which distributes the return current across multiple pathways. This reduces the current density in any single path and minimizes the electromagnetic interference generated by high current density near sensitive components.
Solution Approach 2:
The patent applies different reference potentials to different ground paths in specific locations around the antenna. By creating local zones with controlled reference potentials, the system optimizes the electromagnetic environment in areas where sensitive components are located, reducing the impact of current density and signal radiation.
3Device complexity
If a single ground path is used for antenna connection, then circuit simplicity is maintained, but communication quality deteriorates due to increased current density and signal interference
Solution Approach 1:
The ground connection is divided into multiple segmented paths with different reference potentials, allowing the system to maintain relatively simple circuit topology while improving communication quality. The segmentation enables differential signaling that is more robust against interference without requiring complex shielding or filtering circuits.
Solution Approach 2:
The patent implements dynamic selection of reference potentials based on operating conditions. The system can switch between different reference potential configurations depending on the communication mode, antenna state, or interference level, thereby optimizing communication quality while maintaining circuit simplicity through controlled adaptability.
Data Source
AI summary
In an electronic device and a method of operating an electronic device according to various embodiments, the electronic device may include an antenna. The electronic device may include at least one electronic component. The electronic device may include a switch configured to electrically connect the antenna and at least one of a first path connected to a first ground disposed on one layer of multiple layers of a printed circuit board and a second path connected to a second ground disposed on another layer of the multiple layers. The electronic device may include at least one communication processor, comprising processing circuitry, electrically connected to the switch. At least one communication processor, individually and/or collectively, may output a signal through the antenna in a first state in which the antenna is electrically connected to the first path; control, based on the at least one component being activated, the switch so that the switch is converted from the first state to a second state in which the antenna is electrically connected to the second path; and based on a specified time elapsing, control the switch so that the switch is converted from the second state to the first state.