Glass-Ceramic Antenna Stack for Low-Loss Protected Signal Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing small, portable antennas face signal loss and degradation due to crosstalk and rough handling, requiring robust protection that further degrades signals.
Innovation Solution
An antenna stack design featuring a glass cover with cavities, a polycrystalline ceramic waveguide layer, and evanescent wave coupling between the antenna patch and waveguide, with materials matched for thermal expansion and dielectric constants to enhance signal transfer and toughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If robust cover sheets are used to protect from rough handling, then toughness is improved, but signal loss increases
Solution Approach 1:
The patent changes the material parameters of the cover from conventional robust materials to low-dielectric-constant glass materials (e.g., Gorilla Glass, Corning Glass). This parameter change reduces signal loss while maintaining mechanical toughness through the inherent strength of glass materials.
Solution Approach 2:
The patent employs composite material structures including glass-ceramic laminates and multi-layer glass constructions. These composite materials combine the mechanical strength of glass with optimized dielectric properties, achieving both toughness and low signal loss simultaneously.
2Adaptability or versatility
If signals are transferred through multiple components, then antenna functionality is achieved, but crosstalk and signal degradation occur
Solution Approach 1:
The patent extracts and eliminates unnecessary intermediate components between the antenna element and radiating structure. By using the glass cover itself as both protective element and signal transmission medium, it removes additional transition layers that would cause crosstalk and signal degradation.
Solution Approach 2:
The patent introduces low-dielectric-constant glass materials as an intermediary between antenna components. This intermediary material minimizes electromagnetic interference and signal loss while enabling effective signal transfer through the protective cover.
3Reliability
If material protection layers are added, then environmental protection is improved, but signal transfer quality deteriorates
Solution Approach 1:
The patent changes the dielectric parameter of protection materials from high values (conventional robust materials) to low values (glass materials with dielectric constant < 8.0). This allows the protective material to simultaneously provide environmental protection and maintain high signal transfer quality.
Solution Approach 2:
The glass cover serves multiple functions simultaneously: environmental protection, mechanical strength, and low-loss signal transmission. This multi-functionality eliminates the need for separate protection layers that would degrade signal quality.
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 design reduces signal loss and improves toughness, providing low-loss signal transfer and robustness while maintaining dimensional stability and beam accuracy under shock and temperature changes.
Implementation Method 1
The antenna patch in the cavity is spaced apart from the waveguide layer to facilitate evanescent wave coupling between the feed channels and the antenna patch
Implementation Method 2
a coefficient of thermal expansion of the glass is within 20% of a coefficient of thermal expansion of the polycrystalline ceramic
Implementation Method 3
A dielectric constant at 79 GHz at 25°C of the polycrystalline ceramic is at least twice a dielectric constant of a glass of the glass cover
Data Source
Figure 1~2
Figure 3~5
Figure 6~8
AI summary
An antenna stack includes a glass cover having an outer face, an inside face opposite the outer face, and a body therebetween. The glass cover additionally has a cavity formed therein, extending into the body from the inside face. The antenna stack further includes an antenna patch positioned within the cavity, and a waveguide layer. The waveguide layer includes polycrystalline ceramic underlying the glass cover. Conductive vias extend through the polycrystalline ceramic and partition the waveguide layer to form feed channels through the polycrystalline ceramic, and major surfaces of the polycrystalline ceramic are overlaid with a conductor having openings that open to the feed channels. The antenna patch is spaced apart from the waveguide layer to facilitate evanescent wave coupling between the feed channels and the antenna patch.