Metallized PCB Cavity Waveguide Antenna for Lower Assembly Height
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Solution Overview
Problem
Conventional antenna assemblies using planar metal layers and RF-specific substrates increase height, signal losses, and manufacturing costs, while separate waveguide structures complicate design and manufacturing.
Innovation Solution
An antenna assembly utilizing a metallized cavity in a PCB as a waveguide, with a separate antenna structure attached via soldering or mechanical fastening, reducing height and weight, and using PCB substrates for cost-effective and thermally stable designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate waveguide structures are used, then signal transmission is achieved, but device complexity increases
Solution Approach 1:
The waveguide function is merged with the PCB substrate by creating a metallized cavity within the substrate itself. The conductive traces on the PCB form the waveguide structure that is integrated into the substrate, eliminating the need for separate waveguide components while maintaining signal transmission functionality.
Solution Approach 2:
The PCB substrate serves multiple functions: it provides mechanical support, electrical connections through conductive traces, and waveguide functionality through the metallized cavity. This multi-functionality reduces the number of separate components needed in the antenna assembly.
2Reliability
If conventional antenna assemblies with planar metal layers are used, then antenna functionality is achieved, but height increases
Solution Approach 1:
The waveguide structure is nested within the PCB substrate by forming a metallized cavity inside the substrate thickness. This nesting approach allows the waveguide to occupy the substrate volume rather than extending outward, reducing the overall assembly height while maintaining waveguide functionality.
3Reliability
If RF-specific substrates are used, then signal performance is improved, but manufacturing costs increase
Solution Approach 1:
The invention changes the substrate material parameter from specialized RF-specific substrates to standard PCB substrates. By optimizing the metallized cavity design and conductive trace configuration, the patent achieves acceptable signal performance using cost-effective standard PCB materials, reducing manufacturing costs while maintaining functionality.
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 solution reduces manufacturing complexity and costs, improves thermal stability, and enhances signal isolation and manufacturing tolerances compared to conventional assemblies.
Implementation Method 1
waveguides, ball grid arrays, or other coupling structures
Data Source
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AI summary
The present disclosure relates an antenna assembly that includes an antenna structure and a substrate. The antenna structure may be formed from a single contiguous piece of metal. The antenna structure may include at least one slot antenna formed in the single contiguous piece of metal. The substrate may include at least one dielectric layer, and a waveguide comprising a metallized cavity that extends through the at least one dielectric layer. The antenna structure may be attached to the substrate, may be disposed at an upper surface of the substrate, and may cover the metallized cavity of the waveguide. The substrate may be a printed circuit board (PCB) substrate, an in-mold electronics (IME) substrate, a molded interconnect device (MID) substrate, or another suitable substrate.