Biometric PCB Antenna Paths for Compact Housing Tuning
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Solution Overview
Problem
The limited number of shorting points for adjusting antenna length in electronic devices due to space constraints hinders the optimization of antenna performance in miniaturized devices.
Innovation Solution
Incorporating a biometric circuit board with additional connection points and capacitors/inductors to block interference, and a conductive housing with shorting points to create multiple antenna paths, allowing for flexible adjustment of antenna length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more shorting points are implemented to adjust antenna length, then antenna performance is improved, but device area increases
Solution Approach 1:
The biometric circuit board is designed to serve dual purposes: it provides structural support for biometric components while simultaneously functioning as an antenna element through its connection points to the conductive housing. This multi-functionality allows the same structural component to fulfill both biometric sensing and antenna functions, eliminating the need for additional dedicated antenna space.
Solution Approach 2:
The patent merges the biometric circuit board with the antenna structure by establishing electrical connections between the biometric circuit board, conductive housing, and main circuit board. This integration combines what would traditionally be separate components (biometric circuitry and antenna) into a unified structure, thereby improving antenna performance without increasing overall device area.
2Volume of moving object
If device size is miniaturized, then portability is improved, but antenna adjustment capability deteriorates
Solution Approach 1:
The antenna structure incorporates switchable connection paths that can dynamically change the effective antenna length and configuration. By selectively activating different connection points on the biometric circuit board and main circuit board, the antenna can be adjusted for different frequency bands and operating conditions, providing adaptability within a compact form factor.
Solution Approach 2:
The patent utilizes the vertical stacking of circuit boards (biometric circuit board positioned between conductive housing and main circuit board) to create three-dimensional antenna paths. This vertical arrangement allows for multiple antenna configurations and adjustment capabilities without increasing the device's planar footprint, effectively using the third dimension to maintain adaptability while miniaturizing the device.
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
Enhances antenna performance by enabling adjustable resonant frequencies and improved radiation characteristics without increasing device size.
Implementation Method 1
a first capacitor configured to block biosignal interference between the first connection point and the third connection point
Implementation Method 2
a first inductor configured to block radio frequency (RF) signal interference between the second connection point and the third connection point
Data Source
AI summary
An electronic device includes: a conductive housing; a main circuit board; and a biometric circuit board configured to measure body information, wherein the biometric circuit board may include: a first connection point at which a first conductive connection member contacts the biometric circuit board, the first conductive connection member being configured to electrically connect the conductive housing and the biometric circuit board; a second connection point at which a second conductive connection member contacts the biometric circuit board, the second conductive connection member being configured to electrically connect a biometric button and the biometric circuit board; and a third connection point at which a third conductive connection member contacts the biometric circuit board, the third conductive connection member being configured to electrically connect the main circuit board and the biometric circuit board, and the conductive housing may include a first shorting point electrically connected to the biometric circuit board and the main circuit board to provide an antenna path.