Multi-Layer RF Antenna Impedance Matching via Patterned Vias
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Solution Overview
Problem
Existing multi-layer planar RF antennas face challenges in wideband impedance matching, leading to significant mismatch losses between antenna layers and feed circuitry, which affect bandwidth, VSWR, and gain, particularly for antennas like sinuous, spiral, and log periodic designs.
Innovation Solution
The solution involves forming multiple conductive layers on a dielectric material with patterned connections through vias, enabling wideband impedance matching by aligning the antenna-layout pattern, thereby reducing mismatch losses and improving antenna performance across a wider frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional single-layer or multi-layer planar antenna designs are used, then the antenna can be fabricated using standard PCB processes, but significant mismatch losses occur between antenna layers and feed circuitry, degrading bandwidth, VSWR, and gain
Solution Approach 1:
The patent combines multiple conductive layers (first conductive layer and second conductive layer) with patterned connections through vias to create an integrated multi-layer antenna structure. This merging of layers with strategic via connections reduces mismatch losses between antenna elements and feed circuitry while maintaining fabricability through standard PCB processes, thereby improving energy efficiency without proportionally increasing complexity
Solution Approach 2:
The patent introduces vias as intermediary elements that provide controlled impedance transitions between different conductive layers and to the feed circuitry. These vias act as impedance matching structures that mediate the electromagnetic coupling between layers, reducing reflection and mismatch losses while maintaining a relatively simple overall antenna structure
2Adaptability or versatility
If impedance matching structures are added to improve bandwidth and VSWR, then antenna performance improves, but the part count and manufacturing complexity increase
Solution Approach 1:
The conductive layers and vias in the antenna structure serve multiple functions simultaneously: they provide radiation elements, create impedance transformation, establish electromagnetic coupling, and provide mechanical support. This multi-functionality allows the antenna to achieve wide bandwidth and good VSWR without adding dedicated impedance matching components, thereby improving adaptability while controlling part count
Solution Approach 2:
The patent achieves impedance matching and bandwidth enhancement by optimizing geometric parameters of the conductive layers (such as trace width, spacing, and pattern geometry) and via dimensions (diameter, depth, plating thickness) rather than adding complex matching networks. This parameter optimization approach improves performance while maintaining manufacturing simplicity
3Reliability
If multiple conductive layers with patterned connections are implemented, then mismatch losses are reduced and performance improves, but the manufacturing and design complexity increases
Solution Approach 1:
The antenna is divided into separate conductive layers that can be independently designed and optimized for specific frequency ranges or polarization requirements. Each layer can be fabricated using standard PCB layer processes, and the vias provide controlled connections between layers. This segmentation enables reliable impedance matching while maintaining ease of manufacture through conventional multi-layer PCB fabrication techniques
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 approach significantly enhances the voltage standing-wave ratio (VSWR) and gain of wideband antennas while reducing part count and complexity, resulting in smaller, lighter antennas with lower design, manufacturing, and testing costs, and improved performance over a wider frequency range.
Implementation Method 1
enabling the wideband impedance matching by providing patterned coupling (e.g., electrically conductive coupling, such as electrical connections, hereinafter 'connections') between the first conductive layer and the second conductive layer through multiple vias
Data Source
AI summary
A radio-frequency (RF) antenna with wideband impedance matching includes a first conductive layer, a second conductive layer, and patterned connections. The first conductive layer is formed on a first surface of a dielectric material. The second conductive layer is formed on a second surface of the dielectric material. The patterned connections between the first conductive layer and the second conductive layer are formed through multiple vias to enable the wideband impedance matching. The first conductive layer and the second conductive layer are formed based on an antenna-layout pattern. The multiple vias are formed based on a via pattern that corresponds to the antenna-layout pattern.