Tiered Chassis Antenna Cavity for Signal Transmission
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Solution Overview
Problem
Devices with metal chassis pose challenges in maintaining a clear wireless transmission path due to signal impedance, especially in thin-profile designs where arranging antennas to achieve suitable signal strength is difficult.
Innovation Solution
A tiered chassis structure with an upper and lower plane and a connecting face, featuring an antenna cavity with openings in the upper and connecting faces, allows for a clear wireless transmission path by positioning antennas to transmit and receive signals parallel to the lower face and perpendicular to the upper face, utilizing materials like aluminum or magnesium alloys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal chassis is used for device construction, then structural strength and aesthetics are improved, but wireless signal transmission is impeded due to signal impedance
Solution Approach 1:
The chassis is segmented into multiple tiers with different heights, creating distinct levels. The antenna cavity is positioned in a raised tier, separating the antenna from the metal chassis surface. This segmentation allows the metal chassis to maintain structural strength while the antenna cavity provides an unobstructed transmission path for wireless signals.
Solution Approach 2:
The antenna cavity extends in the vertical dimension, creating a raised tier that elevates the antenna above the metal chassis plane. This dimensional change allows signals to transmit perpendicular to the upper face of the raised tier, bypassing the impedance effects of the metal chassis while maintaining the overall thin-profile design.
2Length of moving object
If device thickness is reduced for thin-profile design, then portability and aesthetics are improved, but antenna arrangement becomes difficult and signal strength decreases
Solution Approach 1:
Instead of increasing device thickness to accommodate antenna arrangements, the invention utilizes the vertical dimension within the existing thin profile. The antenna cavity is formed by raising a portion of the chassis to create a tiered structure, allowing the antenna to transmit signals perpendicular to the upper face of the raised tier without increasing overall device thickness.
Solution Approach 2:
The antenna cavity is nested within the chassis structure itself, with the cavity formed by the tiered arrangement of chassis portions. The metal chassis material is strategically positioned to form both the structural body and the antenna cavity boundaries, eliminating the need for separate antenna housings that would increase thickness.
3Device complexity
If antennas are positioned close to metal chassis surfaces, then device complexity is reduced, but signal transmission is blocked by metal elements
Solution Approach 1:
The chassis is divided into a lower tier and an upper raised tier, with the antenna cavity positioned in the raised portion. This segmentation creates a physical separation between the antenna and the main metal chassis surface, allowing signals to transmit through openings in the upper and connecting faces without being blocked by metal elements.
Solution Approach 2:
The tiered chassis structure itself acts as an intermediary, with the raised tier and its openings providing a transmission path that mediates between the antenna and the external environment. The metal chassis material is arranged to form the cavity boundaries while leaving openings that allow signal transmission perpendicular to the upper face.
Data Source
AI summary
An example device may comprise a metallic chassis having a tiered surface comprising an upper face, a connecting face, and a lower face. The connecting face may be arranged between the upper face and the lower face such that the upper face and the connecting face define a raised area. The device may also comprise an antenna cavity formed in the raised area and having an opening in the upper face and the connecting face.