Antenna Ground Plane Extension via Conductive Loop
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Solution Overview
Problem
Internal antennas in wireless communications devices face challenges in balancing ground plane size and performance, with existing techniques causing electromagnetic interference and being impractical for PCB manufacture.
Innovation Solution
An antenna assembly with an electrically extended ground plane is achieved by coupling conductive members to the ground plane at specific spacings less than a fraction of the operating wavelength, forming loops that enhance antenna performance without altering physical dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ground plane size is increased to improve antenna performance, then antenna performance is improved, but the device size and manufacturing complexity increase
Solution Approach 1:
The patent applies dimensionality change by transitioning from a two-dimensional ground plane on the PCB to a three-dimensional structure using conductive members that extend vertically from the ground plane. These members create a volumetric ground structure that provides enhanced antenna performance without increasing the horizontal footprint on the device housing.
Solution Approach 2:
The conductive members are nested within the device housing structure, integrated into the existing form factor. The ground plane extension is contained within the housing boundaries, allowing the antenna system to achieve improved performance while maintaining compact device dimensions.
2Reliability
If transversal slots are added to control ground plane wavemodes, then antenna performance is improved, but electromagnetic interference and manufacturing complexity increase
Solution Approach 1:
The patent extracts the wavemode control function from the ground plane itself and relocates it to separate conductive members positioned near the ground plane. This separation allows the ground plane to maintain its primary function while the conductive members independently manage wavemodes, reducing electromagnetic interference.
Solution Approach 2:
The ground plane control function is segmented into multiple discrete conductive members rather than modifying the continuous ground plane with slots. This segmentation provides better control over electromagnetic fields and reduces interference while achieving the desired wavemode management.
3Reliability
If the ground plane area is enlarged, then antenna performance is improved, but device manufacturing cost and complexity increase
Solution Approach 1:
The conductive members function as thin, flexible conductive elements that can be easily manufactured and integrated into the device. These members provide the necessary ground plane extension functionality without requiring large-area PCB modifications or additional housing materials, reducing manufacturing cost.
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
This approach improves antenna performance, reduces Specific Absorption Rate (SAR), and allows for smaller device form factors while avoiding manufacturing costs associated with enlarged housings, thus enhancing both low and high-band efficiency and compliance with regulatory standards.
Implementation Method 1
at least one conductive member electrically coupled to the ground plane such that the at least one conductive member forms a loop spaced from the ground plane by a distance that is less than a predetermined fraction of one wavelength of the operating frequency
Data Source
AI summary
Antenna assembly having an electrically or virtually extended ground plane, adapted for use in a mobile communications device, for example. The antenna assembly comprises at least one radiation element having an operating frequency and a ground plane coupled to the radiation element. At least one conductive member is electrically coupled to the ground plane at one or more connection points such that the conductive member forms a loop with the ground plane having a minimum distance therefrom that is less than a predetermined fraction of one wavelength of the operating frequency.