Stacked Antenna Module Layout for Dual-Band Feed Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antenna modules, particularly in mobile communication devices, face challenges in improving isolation between different frequency bands and polarization directions, which affects communication quality and speed.
Innovation Solution
The antenna module incorporates a dielectric substrate with stacked radiating elements, where a via electrode extends through an opening in a larger second radiating element to connect to a smaller first radiating element, altering current distribution and enhancing isolation by concentrating current at the edge of the opening, thereby reducing coupling between feed paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ground pin is connected to the central portions of two stacked radiating elements to improve isolation between feed pins, then isolation between feed pins is improved, but the device complexity increases due to additional grounding structures
Solution Approach 1:
The invention extracts the ground pin connection from the central portion configuration and relocates it to the edge portion of the radiating elements. This extraction simplifies the grounding structure by eliminating the need for complex central grounding arrangements while maintaining isolation performance through edge-based grounding connections.
Solution Approach 2:
The invention transitions the grounding approach from a two-dimensional central connection to a three-dimensional edge-based connection that extends vertically through the stacked radiating elements. The via holes provide vertical grounding paths at the edges, creating a spatial distribution that simplifies the overall grounding structure while effective isolating feed pins.
2Productivity
If communication using radio waves in a plurality of frequency bands is conducted to improve communication quality and speed, then communication quality and speed are improved, but isolation between different frequency bands deteriorates
Solution Approach 1:
The invention applies local quality by positioning feed lines at specific locations (edge portions) of the radiating elements rather than using uniform feeding across the entire structure. This localized feeding approach, combined with selective grounding at edge portions, creates different current distribution patterns for different frequency bands, thereby improving isolation between bands while maintaining multi-band communication capability.
Solution Approach 2:
The invention segments the radiating elements into distinct feeding regions (edge portions) and grounding regions. By dividing the radiating element structure into functionally distinct zones with different feed line configurations and grounding arrangements, the patent achieves better frequency band isolation while supporting multi-band operation.
3Adaptability or versatility
If the size of the second radiating element is made larger than the first radiating element to support dual-band operation, then dual-band capability is achieved, but coupling between feed paths increases
Solution Approach 1:
The invention employs asymmetry by making the second radiating element larger than the first radiating element to support different frequency bands. Combined with asymmetric feed line positioning at edge portions and selective via hole placement, this asymmetric configuration creates different current paths for different bands, reducing coupling between feed paths while maintaining dual-band functionality.
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 configuration improves isolation characteristics between feed ports in dual-band, dual-polarization antenna modules by concentrating current at the edge of the opening, leading to better performance in both same and different frequency bands.
Implementation Method 1
altering current distribution and enhancing isolation by concentrating current at the edge of the opening
Data Source
AI summary
An antenna module includes a dielectric substrate, a ground electrode disposed in the dielectric substrate, flat-plate-shaped radiating elements, feed lines, and a via electrode connected to the ground electrode. The radiating element is disposed opposite the ground electrode in the dielectric substrate. The radiating element is disposed between the radiating element and the ground electrode. The feed line extends through the radiating element and transmits a radio-frequency signal to the radiating element. The feed line transmits a radio-frequency signal to the radiating element. The feed line is electrically coupled to the radiating element at a position offset from a center of the radiating element in a first direction. The feed line is electrically coupled to the radiating element at a position offset from a center of the radiating element in a second direction different from the first direction.