Non-Grounded Passive Element Reduces Antenna Intercoupling
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Solution Overview
Problem
Multiantenna units face challenges in reducing intercoupling between antenna elements while maintaining flexibility in wiring pattern design and achieving downsizing, particularly in portable communication devices.
Innovation Solution
A non-grounded passive element with specific structural features, including extensional portions and coupling portions, is arranged between antenna elements to reduce intercoupling and allow for further downsizing without increasing the size of the passive element's arrangement region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a grounded passive element is used to reduce intercoupling between antenna elements, then intercoupling is suppressed, but flexibility in wiring pattern design is reduced
Solution Approach 1:
The invention extracts the grounding requirement from the passive element, allowing it to function as an isolation element without being connected to ground. This removes the constraint that limited wiring pattern flexibility while maintaining the intercoupling reduction function through the element's resonant properties and spatial arrangement between antenna elements.
Solution Approach 2:
The invention changes the electrical parameter state of the passive element from grounded to non-grounded, which alters its electromagnetic characteristics. By adjusting the element's length, width, and position parameters, it achieves effective intercoupling suppression without requiring ground connection, thereby restoring design flexibility.
2Object-generated harmful factors
If the passive element is made larger to ensure sufficient length for intercoupling reduction, then intercoupling is suppressed, but the plane area of the multiantenna unit increases
Solution Approach 1:
The invention transitions the passive element from a two-dimensional planar structure to a three-dimensional structure by adding extensional portions that extend in directions intersecting with the first surface. This allows the element to achieve sufficient effective length for intercoupling suppression without increasing the planar footprint, as the extensional portions utilize the third dimension (height/thickness direction) to provide the necessary electrical length.
Solution Approach 2:
The extensional portions are integrated into the overall structure of the passive element, with some portions extending from the main body in intersecting directions. This nested integration allows the element to pack efficiently within the multiantenna unit's plane area while maintaining sufficient effective length through the multi-directional extensional structure.
Data Source
AI summary
This multiantenna unit includes a first antenna element, a second antenna element and a non-grounded passive element arranged between the first and second antenna elements. The passive element includes a first portion arranged on a front surface of a substrate and an extensional portion, connected to the first portion, extending perpendicularly to the front surface of the substrate.