Stylus Antenna Grounding for Signal Interference
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Solution Overview
Problem
Conductive materials used in stylus housings interfere with antenna signal transmission, reducing efficiency.
Innovation Solution
A stylus design where a conductive rod is electrically connected to a ground portion of a circuit board, with an antenna featuring a radiating and feeding portion, allowing the radiating portion to rotate or slide away from the conductive rod to minimize interference, and potentially using a planar inverted F antenna configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conductive materials are used in stylus housing for appearance and design requirements, then aesthetic quality is improved, but antenna signal transmitting efficiency deteriorates due to interference from the conductive housing
Solution Approach 1:
A grounding structure is introduced as an intermediary between the conductive housing and the antenna. The grounding structure includes a grounding electrode extending from the circuit board through the conductive housing to an external ground, creating a controlled electrical path that shields the antenna from interference caused by the conductive housing materials
Solution Approach 2:
The conductive housing, which originally causes harmful interference to the antenna signal, is converted into a beneficial element by connecting it to ground. The same conductive material that causes interference is now used to create a controlled ground path that actually protects the antenna by providing a defined reference potential and dissipating unwanted electromagnetic energy
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
Maintains good signal transmitting efficiency even with metal or conductive materials in the stylus, reducing interference and enhancing antenna performance.
Implementation Method 1
the signal transmitting of the antenna may be affected by the conductive housing
Implementation Method 2
The antenna includes a radiating portion and a feeding portion
Data Source
AI summary
A stylus includes a conductive rod, a circuit board, and an antenna. The conductive rod has a first opening. The circuit board is disposed in the conductive rod and includes a ground portion, wherein the conductive rod is electrically connected to the ground portion. The antenna includes a radiating portion and a feeding portion. The feeding portion is electrically connected to the circuit board and extends to the outside of the conductive rod via the first opening. The radiating portion is disposed at the outside of the conductive rod and is electrically connected to the feeding portion.