Waveguide Dielectric Perturbation for Side Lobe Reduction
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Solution Overview
Problem
Existing waveguides with constant cross-sectional areas face challenges in reducing side lobe energy, as they cannot easily convert energy from a dominant propagation mode to a higher order mode without modifying the waveguide wall, which is costly and impractical for systems already in place.
Innovation Solution
Incorporating a dielectric material with varying cross-sectional area along a portion of the waveguide, which emulates a perturbation in the waveguide wall to convert energy from a dominant propagation mode to a secondary mode without altering the waveguide's cross-sectional area, using a mode transition portion and a mode combiner portion to achieve phase difference and cancel longitudinal edge currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the waveguide wall is modified to convert energy from dominant mode to higher order mode, then side lobe energy is reduced, but manufacturing cost and structural complexity increase
Solution Approach 1:
A dielectric member is introduced as an intermediary element inside the waveguide to achieve mode conversion. This dielectric member acts as a mediator that transforms the dominant propagation mode to higher order modes without requiring any modification to the waveguide wall structure, thereby reducing side lobe energy while avoiding costly manufacturing changes
Solution Approach 2:
The dielectric member utilizes changes in dielectric properties (permittivity) along its length to achieve mode conversion. By varying the dielectric constant or physical dimensions of the dielectric member, the patent transforms electromagnetic energy between different propagation modes, effectively reducing side lobe radiation without structural modifications to the waveguide
2Object-generated harmful factors
If the cross-sectional area of the waveguide is varied to convert modes, then energy conversion from dominant to higher order mode is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The dielectric member serves as an intermediary that enables mode conversion within a constant cross-sectional waveguide. Instead of varying the waveguide's cross-sectional area, the dielectric member's varying dielectric properties provide the necessary perturbation to convert modes, simplifying the overall device structure
Solution Approach 2:
The patent changes the dielectric parameter (permittivity) of the dielectric member along its length to achieve mode conversion. This parameter change within the dielectric material provides an alternative to changing the geometric parameters of the waveguide itself, thereby maintaining structural simplicity
3Object-generated harmful factors
If longitudinal edge currents are canceled to reduce side lobe energy, then radiation pattern is enhanced, but additional components or modifications are required
Solution Approach 1:
The dielectric member acts as a single integrated intermediary that achieves both mode conversion and longitudinal current cancellation simultaneously. By strategically positioning and dimensioning the dielectric member, the patent eliminates the need for separate components to address these two related issues
Solution Approach 2:
The patent merges the functions of mode conversion and current cancellation into a single dielectric member structure. This combined approach achieves enhanced radiation patterns by simultaneously transforming propagation modes and canceling longitudinal edge currents, reducing the number of separate components needed
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 efficient mode conversion in waveguides with constant cross-sectional areas, reducing side lobe energy by converting energy from the dominant propagation mode to the secondary mode, thereby enhancing the radiation pattern without the need for costly modifications to the waveguide structure.
Implementation Method 1
convert energy from a dominant propagation mode to a secondary mode
Implementation Method 2
Incorporating a dielectric material with varying cross-sectional area along a portion of the waveguide
Implementation Method 3
receiving electromagnetic energy at a first end of the waveguide and propagating the electromagnetic energy along a length of the waveguide to a second end
Data Source
Figure 1A
Figure 1B~1D
Figure 1E
AI summary
An apparatus includes a waveguide (100). The waveguide (100) includes a waveguide wall (102) having a shape associated with a dominant propagation mode. The waveguide (100) includes a first dielectric material (110) having a cross-sectional area that varies along a length of a portion (106) of the waveguide (100).