Waveguide Antenna PCB Tuning for Manufacturing Imperfections
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Solution Overview
Problem
Existing waveguide and antenna assemblies, such as RADAR sensor assemblies for vehicles, face challenges in tuning and correcting performance due to machining imperfections and high costs associated with reconfiguring or replacing parts.
Innovation Solution
The method involves modifying a printed circuit board (PCB) within the assembly to tune its performance. This includes replacing or modifying the PCB with one having different parameters such as length, width, thickness, dielectric constant, and electromagnetic band-gap structures to adjust the assembly's performance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the waveguide/antenna assembly is manufactured using diecasting or injection molding, then the assembly can be produced as a unitary body, but machining imperfections result in detuned antenna and loss of performance
Solution Approach 1:
The invention divides the assembly into two main segments: a unitary waveguide/antenna body (produced by diecasting or injection molding) and a separate printed circuit board. This segmentation allows the unitary body to be manufactured efficiently while the PCB can be independently tuned to compensate for manufacturing imperfections in the waveguide structures.
Solution Approach 2:
The invention uses parameter changes in the PCB design (such as adjusting trace dimensions, substrate properties, or component values) to tune the overall antenna performance. By modifying PCB parameters, the system compensates for detuning caused by machining imperfections in the unitary body, resolving the contradiction between ease of manufacture and tuning accuracy.
2Manufacturing precision
If corrections for machining imperfections are made to the unitary body, then antenna performance can be improved, but the corrections become costly, time consuming, and difficult
Solution Approach 1:
By separating the tuning function into an independent PCB component, the invention avoids the need to modify the unitary body after manufacturing. Corrections are made by adjusting or replacing the PCB, which is much faster and less costly than reworking the diecast or injection-molded waveguide structures.
Solution Approach 2:
The PCB serves as a disposable or easily replaceable component for tuning purposes. If tuning adjustments are needed, rather than investing significant resources in correcting the unitary body, a new PCB with adjusted parameters can be manufactured at low cost and installed in place of the previous one.
3Productivity
If the printed circuit board is modified to tune the assembly, then performance correction becomes cost-effective and efficient, but the assembly structure becomes more complex
Solution Approach 1:
The PCB serves multiple functions: it provides electrical connections, houses tuning elements, and acts as a ground reference for the antenna system. By consolidating these functions into a single component, the invention achieves tuning capability without proportionally increasing overall assembly complexity.
Solution Approach 2:
The PCB acts as an intermediary between the unitary waveguide body and the external tuning adjustments. Rather than directly modifying the complex diecast structures, all tuning operations are mediated through the PCB, which simplifies the tuning process while maintaining the integrity of the original unitary body design.
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 allows for cost-effective and efficient tuning of waveguide and antenna assemblies by altering the PCB parameters without the need for expensive reconfiguration of the assembly's unitary body, thereby improving performance and reducing time and costs associated with corrections.
Implementation Method 1
a different shape/size, and/or pattern of a series of structures formed within the opening and substrate, such as electromagnetic band-gap (EBG) structures
Implementation Method 2
a different thickness and/or dielectric constant of the substrate
Data Source
AI summary
RADAR sensor assemblies/modules, particularly those for vehicles. In some embodiments, the assembly may comprise a waveguide comprising a waveguide groove defined by opposing waveguide groove structures. An antenna structure may be operably coupled with the waveguide. A printed circuit board may be operably coupled with the waveguide and may comprise an electrically conductive top layer, an electrically conductive bottom layer, and a substrate positioned in between the electrically conductive top layer and the electrically conductive bottom layer. The electrically conductive top layer may comprise an opening exposing the substrate, which opening may extend along the waveguide groove in between the opposing waveguide groove structures. This configuration may allow for various parameters of the printed circuit board to be modified to tune a performance of a sensor/antenna.