Septum Polarizer Projecting Portion Axial Ratio
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Solution Overview
Problem
Conventional septum polarizers with ridges suffer from deterioration in axial ratio characteristics due to the influence of ridges, which affects polarization separation performance.
Innovation Solution
A polarization separation circuit with a square waveguide and a septum phase plate that includes four ridges, where a projecting portion is added on one ridge's opposite side wall surface, larger than the rest, to improve axial ratio characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If ridges are provided on the septum polarizer to reduce aperture size, then the cross-section size can be reduced, but the axial ratio characteristics deteriorate
Solution Approach 1:
The patent applies local quality by providing a projecting portion only on specific ridges (first and third ridges) rather than uniformly on all ridges. This localized modification allows the waveguide to maintain size reduction benefits from ridges while minimizing the detrimental impact on axial ratio characteristics. The projecting portion is strategically placed to control unwanted electric field components without excessively distorting the electromagnetic field distribution.
Solution Approach 2:
The patent introduces asymmetry by making the projecting portion on the first and third ridges different from the second and fourth ridges. The first and third ridges have projecting portions while the second and fourth ridges do not, creating an asymmetric structure that selectively controls electric field components. This asymmetric configuration helps maintain polarization separation performance while achieving size reduction.
2Speed
If ridges are provided on the septum polarizer, then the cut-off frequency can be decreased, but unwanted electric field components increase
Solution Approach 1:
The patent converts the harmful effect of ridges (generating unwanted electric field components) into a beneficial effect by strategically designing projecting portions on specific ridges. The projecting portions on the first and third ridges are configured to control and redirect unwanted electric field components, transforming the ridges from a source of interference into a mechanism for field management. This allows the waveguide to achieve lower cut-off frequency while maintaining signal quality.
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
The configuration enhances axial ratio characteristics by reducing unwanted electric field components, achieving smooth conversion and maintaining size reduction benefits.
Implementation Method 1
the circularly polarized signals are converted into linearly polarized signals, respectively
Implementation Method 2
By providing ridges, the cut-off frequency of the waveguide can be decreased
Implementation Method 3
The configuration enhances axial ratio characteristics by reducing unwanted electric field components
Data Source
AI summary
A square waveguide (1) has four ridges (6a, 6b, 7a, 7b). The cross section of the square waveguide (1) perpendicular to a waveguide axial direction is square. Inside the square waveguide (1), two rectangular waveguide terminals (4, 5) are formed by partitioning the inside along the waveguide axial direction. A septum phase plate (2) formed to get narrower stepwisely as its gets closer to a square waveguide terminal (3) opposite to the rectangular waveguide terminals (4, 5) is provided. A projecting portion (8) is provided on a part of a ridge (7b) formed on a ridge-side wall surface opposite to a wall surface, the septum phase plate (2) being joined to the wall surface in a part where the septum phase plate has largest width, the projecting portion (8) being larger than other parts of the ridge (7b) in a cross-sectional shape perpendicular to the waveguide axial direction.