Waffle-Iron Filter Structure for Wide Stopband Above 20 GHz
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Solution Overview
Problem
Existing high-frequency signal filters struggle to achieve a wide stopband with sufficient attenuation, particularly at frequencies above 20 GHz, due to limitations in manufacturing small tooth structures for waffle-iron filters.
Innovation Solution
A filter arrangement featuring a waffle-iron structure with a carrier plate and electrically conductive pins, precision-manufactured using techniques like 3D printing, to achieve high-frequency filtering capabilities up to 100 GHz or higher.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional waffle-iron filter structures are used for high-frequency signals above 20 GHz, then the filter can process high-frequency signals, but the tooth structures become too small to manufacture with sufficient precision
Solution Approach 1:
The filter structure is divided into modular sections with standardized tooth patterns. The waffle-iron structure is segmented into repeatable units that can be manufactured independently and assembled, allowing each segment to be produced with controlled precision rather than requiring the entire structure to be manufactured as a single complex component.
Solution Approach 2:
The design parameters of the waffle-iron structure are optimized for high-frequency operation. The tooth dimensions, spacing, and overall geometry are specifically calibrated to achieve wide stopband performance at frequencies above 20 GHz while maintaining manufacturable feature sizes through parameter optimization rather than simply scaling down conventional designs.
2Reliability
If the waffle-iron structure is designed for wide stopband performance, then the attenuation in the stopband is improved, but the device complexity increases
Solution Approach 1:
The waffle-iron structure serves multiple functions simultaneously: it provides the primary filtering action, defines the stopband characteristics, and creates the resonant cavities needed for high-frequency operation. This multi-functionality eliminates the need for separate components to achieve each function, reducing overall device complexity while maintaining wide stopband performance.
Solution Approach 2:
The waffle-iron structure is nested within a housing that provides additional filtering and shielding functions. The carrier plate with pins is nested within the waffle-iron structure, creating a compact hierarchical arrangement where each level contributes to the overall filtering performance without requiring separate external components.
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 proposed filter arrangement achieves a wide stopband with high attenuation levels, enabling effective filtering of high-frequency signals, and allows for miniaturization, making it suitable for high-frequency applications.
Implementation Method 1
The waffle-iron arrangement is arranged in the cavity and comprises a carrier plate. The carrier plate includes a plurality of recesses, wherein there is an electrically conductive material arranged in at least some of the recesses in order to form a pin arranged in the recess
Implementation Method 2
The carrier plate includes a material that is permeable to HF signals
Data Source
AI summary
A filter arrangement for high frequency signals, HF signals, is described. The filter arrangement includes a housing in which there is a cavity that extends in the longitudinal direction of the housing. The waffle-iron arrangement is arranged in the cavity and includes a carrier plate having a plurality of recesses, wherein there is an electrically conductive material arranged in at least some of the recesses, wherein the electrically conductive material in each case forms a pin in the at least some recesses. This structure makes it possible to provide a filter arrangement for very high frequencies, because the structure allows the carrier plate and the pins arranged therein to be provided with very small geometrical dimensions.