Antenna Module Shielding Strip Layout for Lower PDE Exposure
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Solution Overview
Problem
Wireless communication systems face challenges in maintaining radio coverage while minimizing power consumption and ensuring reduced power density exposure (PDE) to users, particularly with millimeter wave (mmW) transmissions, as existing methods may not effectively limit PDE outside the field of view of antenna modules or on non-radiating surfaces.
Innovation Solution
Incorporating a shielding strip around the antenna module, which forms a continuous loop around the antenna elements and extends above the radiating surface, to reduce PDE by encasing the antenna elements and optimizing its placement and materials within the user equipment (UE) housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If millimeter wave transmissions are used to improve communication quality and data rate, then communication performance is improved, but power density exposure to users increases beyond acceptable thresholds
Solution Approach 1:
The antenna array is divided into multiple antenna modules, each with its own shielding strip. This segmentation allows independent control and shielding of each module's radiation pattern, enabling the system to maintain high communication performance through selective beamforming while limiting power density exposure in specific directions where users may be present.
Solution Approach 2:
A shielding strip is introduced as an intermediary component between the antenna module and the user environment. This conductive structure acts as a mediator that redirects and limits the radiation pattern, allowing millimeter wave transmissions to maintain communication quality while preventing excessive power density exposure to users outside the intended field of view.
2Object-affected harmful factors
If transmit power is reduced to conform to maximum PDE thresholds, then power density exposure is reduced, but radio coverage and communication quality deteriorate
Solution Approach 1:
The shielding strip is designed with specific local properties - it is positioned and dimensioned to create targeted radiation patterns that concentrate energy in desired directions while limiting exposure in others. This local optimization allows the antenna module to maintain high transmit power for coverage while the shielding structure locally controls power density distribution to meet PDE thresholds in user-exposed areas.
3Object-affected harmful factors
If additional sensors are added to detect and limit PDE, then power density exposure control is improved, but device complexity and cost increase
Solution Approach 1:
The shielding strip provides passive, automatic PDE control through its physical structure and interaction with the antenna radiation pattern. The conductive shielding elements inherently redirect and limit radiation without requiring active sensing or control systems. This self-service approach achieves power density exposure control through the antenna module's own structural components, eliminating the need for additional sensors and complex control circuitry.
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
The shielding strip effectively reduces PDE outside the field of view and on non-radiating surfaces, allowing for higher transmit powers while conforming to maximum PDE thresholds, thereby improving communication quality and usability without the need for additional sensors or reduced transmit power.
Implementation Method 1
the shielding strip may reduce PDE outside a field of view of the antenna module
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may use transmissions causing power density exposure (PDE) to nearby users. To reduce the PDE of an antenna module (e.g., below a maximum PDE threshold), the UE may implement a shielding strip around the antenna module. For example, the antenna module may include a substrate having a first surface and a set of antenna elements on the first surface. The shielding strip may enclose the set of antenna elements of the antenna module and extend away from the first surface above the antenna elements. The shielding strip may reduce PDE outside a field of view of the antenna module. Additionally, in some cases, the placement of the antenna module in the UE and the materials used for constructing the UE may further reduce PDE.