PIFA Antenna Assembly with Overlapping Neutralization Lines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing MIMO antenna assemblies face challenges in compact layout design, leading to increased footprint and RF signal attenuation due to long layout traces and wire crossovers, which affect transmission quality.
Innovation Solution
The antenna assembly features low-frequency and high-frequency antenna units with neutralization lines that overlap and are electrically connected, allowing for shorter layout traces and reduced wire crossovers, utilizing a planar inverted-F antenna (PIFA) structure to maintain isolation and radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional decoupling structures are added to increase isolation between antennas, then antenna isolation is improved, but the footprint of the antenna assembly increases
Solution Approach 1:
The neutralization lines are arranged to overlap with the antenna elements in a nested configuration, where the neutralization lines are positioned to pass through or alongside the antenna structures. This nesting allows the decoupling function to be integrated within the existing antenna footprint rather than requiring additional separate decoupling structures, thereby maintaining antenna isolation while avoiding increased footprint.
2Reliability
If antennas of different frequency bands are arranged with decoupling structures to increase isolation, then antenna isolation is improved, but the layout traces become longer and require more wire crossovers
Solution Approach 1:
The neutralization lines are routed through the third dimension by utilizing overlapping layers and vertical spacing. Instead of extending neutralization lines horizontally across the circuit board plane (which would increase trace length and crossovers), the design uses the vertical dimension by having neutralization lines overlap with antenna elements in different layers or at different heights, achieving decoupling without increasing the two-dimensional trace length.
3Reliability
If layout traces are made longer to accommodate decoupling structures, then antenna isolation is improved, but RF signal attenuation increases
Solution Approach 1:
The neutralization lines are nested within or alongside the antenna element paths, allowing the decoupling function to be achieved without extending the RF signal paths. The RF traces maintain their direct, short connections to the antenna feed points while the neutralization lines are positioned to provide decoupling through overlapping geometry, thus avoiding additional RF trace length and associated signal attenuation.
4Reliability
If more wire crossovers are introduced to accommodate decoupling structures, then antenna isolation is improved, but RF loss increases
Solution Approach 1:
The design eliminates wire crossovers by utilizing the vertical dimension for neutralization line routing. Instead of having neutralization lines cross over RF traces in the same plane (which would create intersection points and potential coupling), the neutralization lines are positioned in overlapping layers or at different heights, achieving decoupling through spatial separation in three dimensions without requiring physical crossovers that would introduce RF loss.
Data Source
AI summary
An antenna assembly with compact layout traces includes a circuit board and at least one wireless antenna unit, wherein the circuit board is provided with an antenna module, the at least one wireless antenna unit can be located at the same edge or at different edges of the circuit board, each of the at least one wireless antenna unit includes two antennas of the planar inverted-F antenna (PIFA) structure and a neutralization line, and the two antennas are spaced apart from each other and the two ends of the neutralization line are electrically connected to and overlap the two antennas respectively. By arranging antennas of the same working band along the same edge of the circuit board, the corresponding layout traces can be effectively shortened.