Multi-Band Antenna Module Layout to Reduce Wave Overlap
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Solution Overview
Problem
Antenna modules in mobile communication devices face challenges with narrow emission ranges due to high-density placement of emitting elements for different frequency bands, leading to overlapping wave directions and reduced coverage.
Innovation Solution
The antenna module is configured with substrates having different normal directions, where emitting elements for lower frequency bands are positioned closer to a ground electrode and farther from the substrate edge, tilting their wave direction away from the substrate, while higher frequency elements are positioned farther from the substrate edge, reducing overlap and increasing the emission range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If emitting elements for different frequency bands are disposed adjacent to each other on the individual surfaces of the dielectric substrate, then the space utilization is improved, but the emission range is reduced due to tilted radio wave directions and wave overlap
Solution Approach 1:
The ground electrode is designed with asymmetric dimensions where the first dimension (along the first direction) is larger than the second dimension (along the second direction). This asymmetry creates different electrical boundary conditions in different directions, causing the radio wave emission directions to tilt away from the normal direction of the substrate surface. By controlling the asymmetry ratio and orientation, the patent achieves non-overlapping emission patterns for adjacent emitting elements, thereby expanding the overall emission range while maintaining high element density.
Solution Approach 2:
Each emitting element is equipped with a ground electrode having specific local dimensional characteristics tailored to its position and function. The ground electrode's first dimension and second dimension are independently controllable, allowing each emitting element to generate radio waves with customized tilt angles and directions. This local optimization ensures that emitting elements disposed adjacently on the substrate surface produce divergent rather than overlapping radiation patterns.
2Volume of moving object
If emitting elements are disposed at high density on the dielectric substrate, then the device size is reduced, but the directivity control becomes difficult leading to wave overlap
Solution Approach 1:
The patent controls the emission directivity by adjusting geometric parameters of the ground electrode, specifically the ratio between its first dimension and second dimension. By changing these dimensional parameters, the tilt angle of the emitted radio waves can be precisely controlled. This parameter-based control method allows for accurate directivity adjustment even when emitting elements are densely packed, enabling each element to radiate in a controlled direction that avoids overlap with adjacent elements while maintaining a compact overall device size.
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 enhances the emission range of the antenna module by minimizing wave overlap, allowing broader coverage in desired directions.
Implementation Method 1
The first emitting element is capable of emitting radio waves of a first frequency band
Implementation Method 2
The second emitting element is capable of emitting radio waves of a second frequency band higher than the first frequency band
Implementation Method 3
a third emitting element, which is disposed on the second substrate
Data Source
AI summary
An antenna module including dielectric electrodes whose normal directions are different from each other, emitting elements and a ground electrode disposed on the dielectric substrate, and emitting elements disposed on the dielectric substrate. The emitting element is capable of emitting radio waves of a first frequency band. The emitting element is disposed adjacent to the emitting element and is capable of emitting radio waves of a second frequency band higher than the first frequency band. On the dielectric substrate, the emitting element is disposed at a position that is closer to the dielectric substrate than the emitting element is. The distance from the center of the emitting element to an end surface of the ground electrode that is closer to the dielectric substrate is shorter than the distance from the center of the emitting element to an end surface of the ground electrode that is farther from the dielectric substrate.