Dual-Substrate Antenna Module Layout for Better Element Isolation
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Solution Overview
Problem
Antenna modules in mobile communication devices face challenges with decreased isolation characteristics between emitting elements disposed on different surfaces of a dielectric substrate due to high density and proximity, especially when emitting elements for different frequency bands are closely positioned.
Innovation Solution
The antenna module is configured with emitting elements on two substrates oriented in different normal directions, where the emitting element for the lower frequency band is positioned farther from the other substrate than the emitting element for the higher frequency band, leveraging the longer wavelength of lower frequency radio waves to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If emitting elements for different frequency bands are disposed adjacent to each other on individual surfaces of the dielectric substrate, then the space utilization is improved, but the isolation characteristics between emitting elements deteriorate
Solution Approach 1:
The patent applies local quality by differentiating the positioning strategy for emitting elements based on their frequency band. Lower frequency band emitting elements are positioned farther from the second substrate, while higher frequency band emitting elements can be positioned closer. This localized differentiation in positioning resolves the contradiction by allowing adjacent disposal of emitting elements (improving space utilization) while maintaining adequate isolation for each frequency band through frequency-specific positioning adjustments.
Solution Approach 2:
The patent changes the positioning parameter (distance from the second substrate) based on the frequency band parameter. By adjusting the position of emitting elements according to their operating frequency, the patent achieves both high space utilization and maintained isolation characteristics. The lower frequency band emitting elements are positioned at a greater distance from the second substrate compared to higher frequency band elements, optimizing isolation for each band while maintaining compact overall structure.
2Quantity of substance
If emitting elements are disposed at high density on the dielectric substrate, then the quantity of emitting elements is improved, but the isolation characteristics between emitting elements deteriorate
Solution Approach 1:
The patent applies local quality by implementing frequency-band-specific positioning for emitting elements. Lower frequency band emitting elements are positioned farther from the second substrate, creating localized isolation zones for each frequency band. This allows high-density disposal of emitting elements across the substrate while maintaining adequate isolation characteristics within each frequency band's operational zone.
Solution Approach 2:
The patent resolves the contradiction by utilizing the third dimension (distance from the second substrate) to achieve isolation. Instead of only adjusting lateral positions on the substrate surface, the patent positions emitting elements at different distances from the second substrate based on their frequency band. This dimensional approach allows high-density lateral arrangement while maintaining isolation through vertical distance differentiation.
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 effectively suppresses the deterioration of isolation characteristics, improving overall performance by about 5 dB in the lower frequency band and maintaining acceptable levels in the higher frequency band.
Implementation Method 1
The first emitting element and the third emitting element are capable of emitting radio waves of a first frequency band. The second emitting element and the fourth emitting element are capable of emitting radio waves of a second frequency band higher than the first frequency band.
Implementation Method 2
The wavelength of radio waves emitted from the emitting element for the lower frequency band is longer than that of radio waves emitted from the emitting element for the higher frequency band
Data Source
AI summary
An antenna module includes dielectric substrates whose normal directions are different from each other, emitting elements disposed on the dielectric substrate, and emitting elements disposed on the dielectric substrate. The emitting element and the emitting element are capable of emitting radio waves of a first frequency band. The emitting element and the emitting element are capable of emitting radio waves of a second frequency band higher than the first frequency band. The emitting element is disposed adjacent to the emitting element in a case where the dielectric substrate is viewed in a plan view from the normal direction. On the dielectric substrate, the emitting element is disposed at a position that is farther from the dielectric substrate than the emitting element is.