Dual-Polarized Antenna Ground Layout for Feed Line Isolation
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Solution Overview
Problem
The existing dual-polarization antenna devices suffer from degraded isolation between feed lines due to current distribution in the ground conductor, which couples the feed lines, affecting the radiation of radio waves in different polarization directions.
Innovation Solution
The antenna module incorporates strip-like ground electrodes that are partially disposed along the feed lines and radiating elements, functioning as resonators to reduce coupling by inducing resonant currents and confining electromagnetic fields, thereby improving isolation between polarized waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ground conductor is continuously provided between the two feed lines, then the structural continuity and grounding effectiveness are improved, but the isolation between feed lines deteriorates due to current distribution coupling
Solution Approach 1:
The continuous ground conductor is divided into multiple separate ground electrodes (first ground electrode and second ground electrode) that are positioned at different locations. This segmentation prevents current distribution along a continuous path between feed lines, thereby reducing coupling while maintaining grounding effectiveness at each segment location.
Solution Approach 2:
A dielectric member is introduced as an intermediary between the ground electrodes and the feed lines. This dielectric member prevents direct electrical contact and current flow between the ground conductor and feed lines, eliminating the coupling effect while preserving the grounding function through capacitive or inductive coupling mechanisms.
2Object-affected harmful factors
If the ground conductor is removed or discontinuous to improve isolation between feed lines, then the coupling between feed lines is reduced, but the grounding effectiveness and structural stability deteriorate
Solution Approach 1:
The ground system is segmented into multiple discrete ground electrodes rather than a single continuous conductor. Each ground electrode maintains local grounding effectiveness while the overall segmented structure prevents unwanted current paths between feed lines, achieving both isolation and grounding effectiveness simultaneously.
Solution Approach 2:
The grounding function is extended to multiple spatial dimensions by positioning ground electrodes at different locations and heights. This dimensional distribution allows each electrode to provide localized grounding while the spatial separation prevents coupling between feed lines, maintaining both isolation and grounding effectiveness.
3Area of stationary object
If feed lines are positioned closer together to reduce device size, then the compactness and integration are improved, but the isolation between polarized waves deteriorates due to increased coupling
Solution Approach 1:
Dielectric members are positioned between the feed lines and ground electrodes as intermediaries. These dielectric members enable close positioning of feed lines for compactness while preventing direct coupling through their insulating properties, thereby maintaining isolation between polarized waves despite reduced spacing.
Solution Approach 2:
The ground system is segmented into multiple electrodes positioned at strategic locations rather than a continuous ground plane. This segmentation allows feed lines to be positioned closer together while the discrete ground electrodes prevent coupling paths, achieving compactness without sacrificing isolation between polarized waves.
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 configuration enhances the isolation between polarized waves by preventing feed lines from coupling, maintaining effective radiation without degrading the desired frequency band performance.
Implementation Method 1
The second ground electrode protrudes from the first ground electrode and is at least partially disposed along the first feed line... functioning as resonators to reduce coupling by inducing resonant currents and confining electromagnetic fields
Data Source
AI summary
An antenna module includes a dielectric substrate, a planar radiating element, first and second ground electrodes), and first and second feed lines. The first ground electrode faces the radiating element in a direction of a line normal to the dielectric substrate. The first and second feed lines are separated from each other and arranged to transfer radio-frequency signals to separate feed points of the radiating element. The second ground electrode protrudes from the first ground electrode and is at least partially disposed along the first feed line. At least part of the second ground electrode is disposed along the radiating element. The dimension of a connecting portion of the second ground electrode with the first ground electrode in the second direction is smaller than the dimension of the second ground electrode in the first direction.