Antenna Feed Line Asymmetry for Polarization Transition Loss
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Solution Overview
Problem
In electronic devices with antenna modules operating in millimeter-wave bands, electrical losses occur due to polarization mismatch between feed lines and antenna elements, leading to reduced antenna peak gain and increased signal loss.
Innovation Solution
An asymmetrical transmission line structure is implemented within the antenna module, where the ground plane is disposed asymmetrically relative to the signal line, allowing for efficient transition between vertical and horizontal electric field components, reducing electrical losses and maintaining reflection coefficient performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional symmetrical transmission line structure is used, then the structure is simple and easy to manufacture, but electrical loss increases due to polarization mismatch between feed line and antenna element
Solution Approach 1:
The patent applies asymmetry by configuring the ground plane to be disposed only in one side portion of the signal line in the transition section, creating an asymmetrical transmission line structure. This asymmetrical configuration enables efficient polarization transition between the feed line and the antenna element, thereby reducing electrical loss while maintaining manufacturing feasibility through a controlled modification of the ground plane layout
2Reliability
If the ground plane is disposed asymmetrically in the transition section, then polarization transition efficiency is improved and electrical loss is reduced, but the structure becomes more complex
Solution Approach 1:
The patent applies local quality by making the ground plane configuration location-dependent: in the transition section, the ground plane is disposed only in one side portion of the signal line to enable polarization transition, while in other sections the ground plane configuration may differ. This localized modification achieves improved polarization transition efficiency without requiring complex ground plane configurations throughout the entire transmission line
3Ease of manufacture
If a symmetrical ground plane configuration is used throughout, then manufacturing is easier, but signal loss increases in the transition section
Solution Approach 1:
The patent applies segmentation by dividing the transmission line into different sections with different ground plane configurations: a transition section with asymmetrical ground plane configuration for polarization transition, and other sections with potentially symmetrical configurations for ease of manufacture. This segmentation allows the system to achieve low signal loss in the critical transition section while maintaining manufacturing simplicity in other sections
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 asymmetrical transmission line structure reduces signal loss and maintains antenna peak gain by efficiently transitioning electric field components, enhancing communication reliability and capacity through improved MIMO performance.
Implementation Method 1
allowing for efficient transition between vertical and horizontal electric field components, reducing electrical losses
Data Source
AI summary
Provided is an electronic device having an antenna according to an embodiment. The electronic device may comprise a first and a second ground plane arranged on different layers of a multi-layer substrate and configured to be connected to each other through vias spaced a predetermined distance apart from each other. The electronic device may comprise a signal line arranged on the same plane as the first ground plane which is disposed at the upper side among the first and the second ground plane. The electronic device may comprise a radiator configured to be electrically connected to the signal line and emit a signal. The first ground plane may be disposed at only one region of one side region and the other side region of the signal line in a predetermined section.