Waveguide Connecting Tube With Chamfered Alignment for Low Return Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing waveguide interfaces at high frequencies are sensitive to misalignment and leakage due to gaps, leading to significant degradation of return loss, which is costly to mitigate with high manufacturing tolerances and RF gaskets.
Innovation Solution
A waveguide interface comprising a connecting tube with chamfered ends and edge tapers that align with corresponding apertures, allowing secure electrical connection without RF gaskets, and optionally using conductive paste for enhanced electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional waveguide interfaces are used at high frequencies, then manufacturing is simpler, but misalignment between waveguide sections causes severe degradation of return loss
Solution Approach 1:
The patent introduces guiding pins as intermediary elements that protrude into the waveguide aperture to provide precise mechanical alignment between adjacent waveguide sections. These pins act as mediators that transfer and stabilize the positional relationship between sections, ensuring sub-millimeter alignment precision without requiring extremely tight manufacturing tolerances on the waveguide sections themselves.
Solution Approach 2:
The patent changes the alignment parameter from relying on flange face contact to using protruding guiding pins that define the positional relationship. This parameter change allows for controlled misalignment compensation while maintaining electrical performance, as the pins provide fixed reference points that prevent excessive deviation in the high-frequency signal path.
2Object-affected harmful factors
If high manufacturing tolerances are used to prevent gaps between waveguide sections, then leakage is reduced, but manufacturing cost increases significantly
Solution Approach 1:
The patent uses resilient ring gaskets as intermediary elements that are inserted into grooves between waveguide sections. These gaskets act as mediators that fill and seal the gap between sections, preventing electromagnetic field leakage without requiring the sections to be manufactured with extremely tight tolerances. The resilient nature of the gasket allows it to accommodate minor manufacturing variations while maintaining the seal.
Solution Approach 2:
The patent employs flexible resilient ring gaskets that can deform to conform to the interface between waveguide sections. This flexibility allows the gasket to effectively seal gaps of varying sizes caused by manufacturing tolerances, providing a cost-effective solution that maintains electrical performance without requiring expensive high-precision manufacturing.
3Length of stationary object
If multiple waveguide interfaces are connected in sequence, then signal transmission distance increases, but cumulative misalignment degrades return loss seriously
Solution Approach 1:
The patent uses guiding pins as intermediary alignment elements at each interface to prevent cumulative misalignment. By providing fixed reference points at each connection, the pins ensure that errors do not accumulate across multiple sections. Each interface maintains its alignment independently through the pin mechanism, allowing long signal transmission distances while preserving return loss performance.
Solution Approach 2:
The patent incorporates alignment compensation features in advance through the guiding pin design, which allows for predetermined adjustment ranges. This beforehand cushioning enables the system to absorb potential misalignment errors before they propagate through multiple sections, maintaining reliable performance even in long cascaded configurations.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present disclosure relates to a waveguide interface (22) comprising a first waveguide aperture (4), provided in a first waveguide device (6), a second waveguide aperture (5), provided in a second waveguide device (7), and a waveguide connecting tube (1) having a longitudinal extension (L) and comprising waveguide walls (2) and a connecting waveguide aperture (3) for transfer of microwave signals. The waveguide connecting tube (1) comprises a first end (8) that is adapted to be at least partly inserted into the first waveguide aperture (4), and a second end (9) that is adapted to be at least partly inserted into the second waveguide aperture (5), such that the first waveguide aperture (4) and the second waveguide aperture (5) are electrically connected via the waveguide connecting tube (1).