Open Trough Waveguide Bend With Asymmetric Channel Depth
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Solution Overview
Problem
Existing asymmetrical trough waveguide antennas suffer from unacceptable leaks due to phase misalignment in the bend region, leading to significant signal loss.
Innovation Solution
The trough waveguide antenna design includes an inner channel with varying depth in the bend region to maintain phase alignment, featuring a deeper depth in the interior channel and gradual transitions to match the outer channel depth, reducing signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bend is added to the trough waveguide antenna for routing purposes, then the antenna routing flexibility is improved, but signal leakage increases significantly
Solution Approach 1:
The patent applies local quality by creating an asymmetric channel depth configuration specifically in the bend region. The interior channel is made deeper than the exterior channel only where the bend occurs, while maintaining uniform depth in straight sections. This localized structural modification allows the bend to achieve routing flexibility without causing significant signal leakage, as the deeper interior channel compensates for the phase differences introduced by the bend geometry.
Solution Approach 2:
The patent employs asymmetry by deliberately making the interior channel deeper than the exterior channel in the bend region. This asymmetric depth configuration counteracts the phase misalignment that naturally occurs in bent waveguide structures. The asymmetric design allows the bend to provide routing flexibility while maintaining proper phase alignment between channels, thereby reducing signal leakage.
2Manufacturing precision
If the interior channel depth is increased in the bend region, then phase alignment is improved, but manufacturing complexity increases
Solution Approach 1:
The patent limits the increased manufacturing complexity to a localized region by making the interior channel deeper only in the bend section, while keeping the exterior channel and other regions uniform. This localized approach improves phase alignment where it is most needed (in the bend region) without requiring complex depth variations throughout the entire antenna structure, thus controlling overall manufacturing complexity.
Solution Approach 2:
The patent changes the geometric parameter of channel depth specifically in the interior channel within the bend region. By adjusting this single parameter (depth) in a localized area, the patent achieves improved phase alignment without requiring changes to multiple parameters or the overall structural configuration, thereby minimizing the increase in manufacturing complexity.
Data Source
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AI summary
A radar control module includes a printed circuit board including a radio frequency port. A trough waveguide antenna is mounted to the printed circuit board and includes a base and a first sidewall and a second sidewall each extending from the base. A fin extends from the base along a center region between the first sidewall and the second sidewall and an open side opposite the base. A first channel is disposed between the first sidewall and the fin and a second channel is formed between the second sidewall and the fin. The trough waveguide antenna includes a bend region in which the first channel is on an interior of the bend region and the second channel is on an exterior of the bend region and a depth of the first channel is deeper in the bend region than a depth of the second channel in the bend region.