PCB Antenna Bracket Layout for Compact Device RF Isolation
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Solution Overview
Problem
The challenge of positioning antennas in electronic devices with limited space while maintaining coverage and radiation performance for desired frequency bands is exacerbated by the addition of various components, leading to electrical interference and reduced communication range.
Innovation Solution
The electronic device incorporates a support structure with a conductive and non-conductive portion, a printed circuit board, and a bracket system that stabilizes antenna elements near the non-conductive portion, utilizing air gaps and dielectric materials to enhance coverage and radiation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple components are added to electronic devices to support various functions, then the functionality and application range are expanded, but the available space for antenna positioning is reduced and electrical interference increases
Solution Approach 1:
The patent utilizes the Z-axis (thickness direction) by positioning the antenna on the printed circuit board rather than on the side surface, effectively using the vertical dimension to resolve space constraints. The bracket structure extends from the side portion inward to hold the antenna at an optimized distance from the front plate, converting a 2D surface placement problem into a 3D spatial arrangement.
Solution Approach 2:
The bracket acts as an intermediary component between the side portion and the antenna element. It provides mechanical support while maintaining the required spacing, and the non-conductive portion of the bracket serves as an electrical isolator between the conductive side portion and the antenna, reducing electrical interference while enabling stable positioning.
2Reliability
If the antenna is positioned closer to the front plate to improve coverage, then radiation performance is enhanced, but electrical interference with other components increases
Solution Approach 1:
The non-conductive portion of the bracket serves as an electrical isolator or intermediary between the conductive side portion and the antenna element. This allows the antenna to be positioned close to the front plate for optimal radiation while the non-conductive material prevents electrical interference from the conductive housing components.
Solution Approach 2:
The bracket is designed with different material properties in different regions: the first portion is conductive to maintain electrical connection with the side portion, while the second portion is non-conductive to provide electrical isolation near the antenna. This local differentiation of material properties optimizes both electrical connectivity and interference reduction.
3Object-affected harmful factors
If the antenna is positioned deeper inside the device to reduce interference, then electrical isolation is improved, but coverage and radiation performance are reduced
Solution Approach 1:
Instead of moving the antenna deeper along the X or Y axes, the patent utilizes the Z-axis by extending the bracket inward from the side portion to hold the antenna at an optimized distance from the front plate. This vertical positioning allows the antenna to maintain good radiation characteristics while being electrically isolated from interfering components.
4Strength
If the side portion is made entirely conductive for structural strength, then mechanical strength is improved, but electrical interference with the antenna increases
Solution Approach 1:
The side portion is designed with local quality differentiation: the first portion remains conductive to maintain structural strength and electrical connectivity, while the second portion is made non-conductive to provide electrical isolation near the antenna. This localized material property change maintains overall structural integrity while reducing electrical interference in the critical antenna region.
Solution Approach 2:
The side portion is segmented into two distinct portions with different electrical properties. The conductive first portion provides structural support and electrical connection, while the non-conductive second portion provides electrical isolation. This segmentation allows each portion to fulfill its specific function without compromising the other.
Data Source
AI summary
An electronic device includes: a front plate; a rear plate; a side portion including a conductive portion and a non-conductive portion; a support portion; a printed circuit board including: a first surface facing the non-conductive portion; and a second surface facing a direction opposite to the first surface; at least one antenna element disposed on the first surface or disposed inside the printed circuit board closer to the first surface than to the second surface; and a bracket connecting the printed circuit board and the support portion and including: a first portion on which the printed circuit board is disposed; and a second portion extending from the first portion and fixed to the support portion by a screw. The support portion includes a wall protruding toward the rear plate. The printed circuit board is between the non-conductive portion and the wall. The wall supports the first portion.