Stepped Floor Waveguide Circulator for Wide Bandwidth
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Solution Overview
Problem
Conventional waveguide circulators face challenges in achieving good performance over a wide bandwidth while maintaining a reduced size, due to fixed dimensions that do not accommodate varying frequency ranges effectively.
Innovation Solution
The design incorporates a stepped floor and/or ceiling with quarter-wave dielectric transformers, allowing for a first region with a larger height proximate the central cavity and a second region with a smaller height proximate the waveguide arms, enabling efficient impedance matching and signal transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the waveguide housing uses a constant height between floor and ceiling throughout the central cavity and waveguide arms, then the manufacturing is easier and high quality coupling is achieved, but the bandwidth is limited and the size cannot be reduced effectively
Solution Approach 1:
The waveguide housing is segmented into multiple regions along its length, with each region having a different height between floor and ceiling. The first region has a first height and the second region has a second height that is different from the first height, allowing each segment to be optimized for specific functions such as impedance matching and signal coupling, thereby increasing bandwidth while maintaining manufacturing feasibility
Solution Approach 2:
Different regions of the waveguide housing are given different local qualities through varying heights. The first region is designed with a specific height to optimize coupling between waveguide arms, while the second region has a different height to achieve impedance matching or bandwidth extension, allowing each local area to perform its specific function optimally
2Volume of moving object
If the waveguide housing is reduced in size, then the compactness is improved, but the performance over wide bandwidth deteriorates
Solution Approach 1:
The invention utilizes the height dimension (vertical dimension between floor and ceiling) to achieve impedance matching and bandwidth control. By varying the height in different regions, the patent effectively uses this dimension to manipulate electromagnetic field distribution and impedance characteristics, allowing compact size in horizontal dimensions while maintaining wide bandwidth performance through vertical dimension optimization
3Adaptability or versatility
If the height between floor and ceiling is varied to achieve wide bandwidth and compact size, then the bandwidth and size are improved, but the manufacturing complexity increases
Solution Approach 1:
The complex height variation profile is achieved through segmentation into discrete regions with constant heights within each region. The first region has a first height and the second region has a second height, creating a stepped or segmented structure that is easier to manufacture than a continuously varying height profile, while still achieving the desired bandwidth and size optimization
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 configuration enhances operational characteristics over a wide bandwidth in a compact size by optimizing the height difference between central cavity and waveguide arms, reducing signal loss and enabling efficient signal coupling.
Implementation Method 1
enabling efficient impedance matching and signal transition
Implementation Method 2
one or more quarter-wave dielectric transformers attached to the ferrite element
Implementation Method 3
enabling efficient signal coupling
Implementation Method 4
reducing signal loss
Implementation Method 5
A ferrite element is located in the central cavity to increase coupling between the arms
Data Source
Figure 1~2
Figure 3
Figure 4A~4C
AI summary
In an example, a circulator is disclosed. The circulator includes a waveguide housing having a plurality of hollow waveguide arms that communicate with a central cavity. The waveguide arms include, and the central cavity is defined by, a floor, a ceiling, and a plurality of sidewalls connected between the floor and the ceiling. At least one of the floor or the ceiling includes at least one step which defines a junction between a first region having a first height between the floor and the ceiling and one or more second regions having a second height between the floor and the ceiling. The first region is proximate the central cavity and the one or more second regions are proximate the waveguide arms. The first height is larger than the second height.