Antenna-Mounted Substrate Permittivity Layering for Rigidity
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Solution Overview
Problem
Existing antenna-mounted substrates face challenges in maintaining stable antenna characteristics due to decreased rigidity and thickness, as the presence of cavities between antenna elements can lead to instability and deformation, making it difficult to reduce substrate thickness while maintaining relative permittivity.
Innovation Solution
The proposed solution involves a layered structure with a first patch antenna, a second patch antenna, a ground electrode, an antenna holding layer, an inter-antenna layer made of dielectric material, and a substrate layer, where the relative permittivity of the inter-antenna layer is minimized and the substrate layer is maximized to ensure rigidity and reduce thickness, with the inter-antenna layer optionally featuring a cavity portion and support portions to further stabilize the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cavity is formed in the dielectric separator between antenna elements, then the relative permittivity is reduced and antenna characteristics are improved, but the rigidity of the substrate decreases and the distance between antenna elements becomes unstable
Solution Approach 1:
The dielectric separator is designed with spatially varying properties: a first region with higher relative permittivity near the lower antenna element and a second region with lower relative permittivity near the upper antenna element. This local quality variation allows the structure to provide both electrical performance (through permittivity control) and mechanical support (through the higher permittivity region's proximity to the lower element), resolving the contradiction between antenna characteristics and substrate rigidity.
2Length of stationary object
If the dielectric separator is made thinner to reduce substrate thickness, then the overall thickness is reduced, but the rigidity decreases and the upper antenna element may deform to the projecting side
Solution Approach 1:
The invention changes the permittivity parameter distribution within the dielectric separator, creating regions with different relative permittivity values. This parameter variation allows the thin separator to maintain adequate rigidity through the higher permittivity first region while still achieving overall thickness reduction, preventing deformation of the upper antenna element.
3Reliability
If the distance between antenna elements is reduced to improve antenna characteristics, then the substrate thickness can be reduced, but the rigidity decreases and stability of antenna characteristics deteriorates
Solution Approach 1:
By creating local quality variations in the dielectric separator with distinct permittivity regions, the invention maintains stable antenna characteristics even at reduced element distances. The higher permittivity first region provides consistent electrical performance near the lower antenna element, while the overall compact structure achieves reduced thickness without compromising stability.
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 stabilizes antenna characteristics, suppresses substrate warping, and allows for a reduction in substrate thickness while ensuring the rigidity of the antenna-mounted substrate, enabling improved antenna performance and integration with electronic components.
Implementation Method 1
a relative permittivity of the inter-antenna layer is denoted by εr2... a relation of εr3>εr1≥εr2 is satisfied
Implementation Method 2
when viewed in a section perpendicular to a thickness direction of the inter-antenna layer, the support portion has a honeycomb shape dividing the cavity portion into the plurality of regions
Data Source
AI summary
An antenna-mounted substrate includes a first patch antenna, a second patch antenna disposed to face one principal surface of the first patch antenna, and a ground electrode disposed to face the other principal surface of the first patch antenna, the antenna-mounted substrate further including an antenna holding layer holding the second patch antenna, an inter-antenna layer positioned between the first patch antenna and the second patch antenna, and a substrate layer positioned between the first patch antenna and the ground electrode, those three layers being positioned in the mentioned order, wherein the inter-antenna layer is made of a dielectric material, and a relation of εr3>εr1≥εr2 is satisfied on an assumption that a relative permittivity of the antenna holding layer is denoted by εr1, a relative permittivity of the inter-antenna layer is denoted by εr2, and a relative permittivity of the substrate layer is denoted by εr3.