Multi-junction Waveguide Circulator with Overlapping Transformers
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Solution Overview
Problem
Conventional multi-junction waveguide circulators are large and heavy due to the long air-filled waveguide sections between ferrite elements, leading to increased insertion loss and size, while attempts to reduce these aspects often compromise manufacturability or isolation performance.
Innovation Solution
The solution involves overlapping quarter-wave dielectric transformers along the same length of waveguide, eliminating the air-filled section and reducing the separation distance between ferrite elements, thereby minimizing transition length, size, and mass, while maintaining impedance match and isolation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional air-filled waveguide sections are used between ferrite elements, then impedance matching and field transition are achieved, but the circulator assembly becomes large and heavy with increased insertion loss
Solution Approach 1:
The patent merges the quarter-wave dielectric transformer and the impedance-matching section into a single overlapping structure. The dielectric transformer of the first ferrite element and the dielectric transformer of the second ferrite element overlap along the waveguide length, eliminating the need for a separate air-filled waveguide section between them. This combining of functions reduces the overall separation distance and minimizes insertion loss while maintaining proper impedance matching.
2Volume of moving object
If the separation distance between ferrite elements is reduced, then size and mass are decreased, but isolation performance may be compromised
Solution Approach 1:
The patent applies local quality by using dielectric material with specific permittivity in the overlapping region between ferrite elements. This dielectric material is strategically placed to provide the necessary field confinement and impedance transformation locally, ensuring that isolation performance is maintained even though the overall separation distance between ferrite elements is reduced. The local dielectric structure compensates for the reduced spacing while preserving the circulator's isolation characteristics.
3Weight of stationary object
If quarter-wave dielectric transformers are overlapped, then transition length and mass are reduced, but manufacturing complexity may increase
Solution Approach 1:
The patent segments the waveguide structure into distinct regions: ferrite element regions with their respective quarter-wave dielectric transformers, and overlapping transition regions. By defining clear boundaries and separation distances between these segments, the design allows for modular manufacturing and assembly. The overlapping portion is designed with specific dimensional parameters that can be controlled during fabrication, making the manufacturing process manageable while still achieving the mass reduction benefits of the overlapping configuration.
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 results in a more compact, lighter multi-junction waveguide circulator with reduced insertion loss and improved manufacturability without sacrificing isolation performance, operating effectively over a broader frequency range.
Implementation Method 1
The circulators can be connected in various configurations as required for the desired isolation and input/output port configuration. The direction of circulation may either be fixed or switchable.
Implementation Method 2
When a magnetizing field is created in this ferrite element, a gyromagnetic effect is created that can be used for circulating the microwave signal from one waveguide arm to another.
Data Source
AI summary
An improved multi-junction waveguide circulator overlaps two quarter-wave dielectric transformer sections so that the transitional sections occur concurrently in the same length of waveguide. Consequently, the two quarter-wavelength sections require a total length of between one-quarter wavelength and one-half wavelength, with no air gap between the two sections along the length of the internal cavity. The improved waveguide circulator can be implemented in variations from a minimum of two ferrite circulator elements held in close proximity to one another to any number of ferrite elements as required to achieve the desired isolation performance or to create a switch matrix with any combination of input and output ports. The improved waveguide circulator minimizes the length of the transitions between adjacent ferrite elements and thus reduces losses, component size, and mass.