Multi-Cavity Antenna for Resilient Multi-Band Operation
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Solution Overview
Problem
Antenna design for small-form factor devices like smartphones and smartwatches requires significant re-design to minimize performance impact from nearby objects, which increases costs due to material, manufacturing, and engineering efforts, while maintaining FCC compliance and industrial design preferences, especially with metallic uni-body designs.
Innovation Solution
A multi-cavity antenna with a dielectric substrate and grounded conductive layers, featuring irregular permittivity and permeability, and tunable cavities, allowing for flexible integration and minimal resonance disruption from nearby components, enabling multi-band operation and efficient bandwidth use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna design is customized for each device variant to minimize performance impact from nearby objects, then antenna performance and FCC compliance are improved, but manufacturing cost and time to market increase
Solution Approach 1:
The antenna is divided into multiple independent resonant cavities (first cavity and second cavity) that can operate at different frequencies simultaneously. Each cavity is independently designed to be less sensitive to nearby objects, allowing the antenna to maintain performance across different device configurations without requiring complete redesign for each variant.
Solution Approach 2:
The multi-cavity antenna structure serves multiple frequency bands and operational modes within a single integrated design. The antenna card can be universally applied across different device variants and markets, reducing the need for customization while maintaining performance requirements through its inherent multi-band capability and reduced sensitivity to nearby objects.
2Reliability
If antenna design is customized for each device variant, then antenna performance is improved, but material and manufacturing cost increase
Solution Approach 1:
The antenna is divided into multiple independent resonant cavities (first cavity and second cavity) that can operate at different frequencies simultaneously. Each cavity is independently designed to be less sensitive to nearby objects, allowing the antenna to maintain performance across different device configurations without requiring complete redesign for each variant.
Solution Approach 2:
The multi-cavity antenna structure serves multiple frequency bands and operational modes within a single integrated design. The antenna card can be universally applied across different device variants and markets, reducing the need for customization while maintaining performance requirements through its inherent multi-band capability and reduced sensitivity to nearby objects.
3Ease of manufacture
If traditional single-cavity antenna design is used, then manufacturing is simpler, but performance is disrupted by nearby objects
Solution Approach 1:
The antenna is divided into multiple independent resonant cavities (first cavity and second cavity) that can operate at different frequencies simultaneously. Each cavity is independently designed to be less sensitive to nearby objects, allowing the antenna to maintain performance across different device configurations without requiring complete redesign for each variant.
Solution Approach 2:
Different regions of the antenna (different cavities) are designed with specific electromagnetic properties optimized for their intended frequency ranges. The first cavity and second cavity have different dimensions and resonant frequencies, allowing each to be less affected by nearby objects in their respective operational bands while maintaining overall antenna performance.
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 antenna achieves improved performance, reduced costs, and increased resilience to nearby objects, enabling reuse across different devices and markets with interchangeable antenna cards, thus reducing time and cost associated with redesign and manufacturing.
Implementation Method 1
The substrate 110 may have an irregular permittivity and/or permeability
Implementation Method 2
Each of the antenna cavities 140-1, 140-2, 140-3 comprises two sides not covered by a conductive layer, and is configured to operate at specific, respective frequencies
Implementation Method 3
The conductive walls 130-1, 130-2 are formed orthogonal to the top and bottom grounded conductive layers 120T, 120B
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3C
AI summary
An antenna including a substrate; top and bottom grounded conductive layers formed on respective larger faces of the substrate; an antenna feed coupled to at least one of the top and bottom grounded conductive layers, and configured to feed radio signals to the antenna; and at least one conductive wall formed to the top and bottom grounded conductive layers, and configured to form a short-circuit between the top and bottom grounded conductive layers, wherein the substrate and the at least one conductive wall forms a plurality of antenna cavities configured to operate at specific, respective frequencies, and each of the plurality of antenna cavities comprises at least two sides not covered by a conductive layer.