Antenna Support Bracket Layout to Reduce Eddy Current Loss
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Solution Overview
Problem
The presence of conductive members near antenna structures in electronic devices generates eddy currents, leading to radiation degradation and reduced gain, while extending non-conductive members to maintain distance from the antenna structure compromises device rigidity.
Innovation Solution
An antenna structure with a support structure that includes a conductive bracket with an extension part perpendicular to the substrate surface, reducing rear surface excitation currents and maintaining device rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conductive member is located near the antenna structure, then structural support and rigidity are provided, but eddy currents are generated causing radiation degradation and reduced gain
Solution Approach 1:
A non-conductive member is introduced as an intermediary between the conductive member and the antenna structure. This intermediary prevents direct interaction between the conductive member and antenna, thereby eliminating eddy current generation while still allowing the conductive member to provide structural support through the non-conductive member
2Object-generated harmful factors
If the non-conductive member coupled with the conductive member is extended to a position relatively far from the antenna structure to reduce eddy currents, then radiation performance is improved, but device rigidity decreases
Solution Approach 1:
The solution moves from a one-dimensional approach (extending the non-conductive member in one direction away from the antenna) to a multi-dimensional approach by configuring the non-conductive member to have specific geometric features including a first surface, second surface, and side surfaces that create a three-dimensional structure. This allows the non-conductive member to maintain adequate distance from the antenna in critical dimensions while providing structural support through its volumetric configuration
3Strength
If the non-conductive member is positioned close to the antenna structure, then device rigidity is maintained, but excitation current concentration occurs on the rear surface degrading front direction radiation
Solution Approach 1:
The non-conductive member is designed with different surface characteristics and orientations. The first surface, second surface, and side surfaces are configured to have different spatial relationships with the antenna structure, creating local variations in how electromagnetic fields interact with the structure. This local quality differentiation prevents uniform excitation current concentration while maintaining overall structural integrity
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
Improves radiation performance in the front direction by minimizing rear surface excitation current concentration while maintaining device rigidity.
Implementation Method 1
a conductive member located near the antenna structure and forming the boundary area by being combined with a non-conductive member may generate an eddy current or surface wave (e.g., trap current)
Data Source
AI summary
An electronic device according to various embodiments may comprise: a housing; an antenna structure comprising a substrate, which comprises a first substrate surface facing a first direction and a second substrate surface facing a second direction opposite from the first substrate surface, and at least one antenna element disposed on the substrate so as to form a beam pattern in the first direction; a first support part disposed so as to at least partially correspond to the second substrate surface; a conductive bracket comprising at least one conductive extension part disposed higher than the second substrate surface with respect to the first support part; and a wireless communication circuit configured to transmit and/or receive a wireless signal in a designated frequency band by means of the at least one antenna element.