Glide-Symmetric Waveguide Flange Holes for Leakage Reduction
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Solution Overview
Problem
Current waveguide flanges face challenges with leakage and reflection due to tolerances and errors in mating, particularly at higher frequencies, where accurate fabrication is required, making the process time-consuming and laborious, and limiting their use.
Innovation Solution
The implementation of a waveguide assembly with flanges featuring periodically distributed holes that are at least partly glide symmetrically positioned, allowing for improved alignment and connection without the need for precise alignment pins, reducing leakage and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional smooth flanges are used for waveguide connection, then the structure is simple and easy to manufacture, but leakage and reflection occur due to gaps between flanges
Solution Approach 1:
The flange surface is segmented into multiple periodic unit cells, each containing conductive elements (pins, corrugations, or holes) arranged in a glide-symmetric pattern. This segmentation transforms the continuous flange surface into discrete functional units that collectively prevent leakage while maintaining overall structural simplicity
Solution Approach 2:
The patent employs glide-symmetric positioning of unit cells rather than simple rotational symmetry. The asymmetric glide-symmetric arrangement (where unit cells are positioned with both translational and reflective symmetry) creates specific electromagnetic boundary conditions that effectively suppress leakage modes while allowing straightforward manufacturing
2Reliability
If pin-flange adapters are used to avoid power loss, then connection reliability improves, but manufacturing precision requirements increase and the process becomes time-consuming
Solution Approach 1:
The periodic glide-symmetric structure of unit cells provides self-aligning characteristics. The repetitive pattern creates natural reference points that guide the mating flanges into proper alignment without requiring external alignment pins or fixtures, enabling operators to achieve accurate connections through simple visual or tactile feedback
Solution Approach 2:
The patent transforms the alignment problem from a precision mechanical positioning task to a pattern-matching task. By changing the flange surface parameters to include periodic glide-symmetric unit cells, the system shifts from requiring sub-millimeter precision to allowing broader tolerances while maintaining connection reliability
3Object-affected harmful factors
If accurate fabrication methods are used for choke flanges and pin-flanges, then leakage is reduced, but the manufacturing process becomes laborious and time-consuming
Solution Approach 1:
The patent employs simple, easily manufacturable unit cell structures (such as drilled holes or simple corrugations) that can be produced quickly using standard manufacturing processes. These simplified structures replace complex precision-machined features while achieving comparable or superior leakage prevention, dramatically improving manufacturing efficiency
Solution Approach 2:
The periodic arrangement of identical unit cells around the flange perimeter allows for efficient manufacturing through repetitive processes. The same unit cell pattern can be manufactured multiple times and assembled, or manufactured once and replicated through tooling, significantly reducing the time and labor required compared to custom-machining each flange feature
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 solution eliminates signal leakage across a wide band of frequencies, provides a smooth transition, and is less sensitive to manufacturing tolerances and misalignments, making it more efficient and cost-effective compared to traditional pin-flange designs.
Implementation Method 1
The first waveguide is arranged to be connected to a second waveguide by connecting the first flange to a second flange of the second waveguide such that the end opening of the first waveguide faces an end opening of the second waveguide and such that the holes in the first flange are at least partly glide symmetrically positioned with respect to holes which are periodically distributed around the end opening of the second flange
Data Source
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AI summary
The embodiments herein relate to a first waveguide comprising a first flange (103a) surrounding an end opening (105a) of the first waveguide (101a). The first flange (103a) comprises at least two holes (110) which are periodically distributed around the end opening (105a). The first waveguide (101a) is arranged to be connected to a second waveguide (101b) by connecting the first flange (103a) to a second flange (103b) of the second waveguide (101b) such that the end opening (105a) of the first waveguide (101a) faces an end opening (105b) of the second waveguide (101b) and such that the holes (110) in the first flange (103a) are at least partly glide symmetrically positioned with respect to holes (110) which are periodically distributed around the end opening (105b) of the second flange (103b).