Dual-Polarization Waveguide Adapter with Ridgeless Transition
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Solution Overview
Problem
Existing connecting structures for orthogonal polarization signals in dual-band radio link transmission are complex, costly, and require manual calibration, with issues of signal mismatch and reflection due to the use of ridged adapters and complex curved connections, making them difficult to integrate with dual-band antennas and transceivers.
Innovation Solution
A connecting structure with rectangular input/output ports connected to a Y-shaped guide section that divides signals into two rectangular guides with curved transition sections, followed by a ridgeless adapter guide section that gradually changes from rectangular to annular segment form, allowing direct connection to a coaxial guide while minimizing reflections and signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ridged adapter guides and complex curved connections are used to connect rectangular waveguide ports to coaxial guides, then signal transmission is achieved, but the structure becomes complex, manufacturing costs increase, and manual calibration is required
Solution Approach 1:
The adapter guide is divided into multiple sections with progressively changing cross-sectional dimensions. Each section transitions the signal path from rectangular to circular geometry in discrete steps, eliminating the need for complex ridged structures while maintaining signal integrity through gradual impedance transformation.
Solution Approach 2:
The cross-sectional dimensions of the adapter guide are systematically varied along its length, transitioning from rectangular dimensions matching the waveguide to circular dimensions matching the coaxial guide. This gradual parameter change enables impedance matching without requiring manual calibration or complex ridged adapter structures.
2Ease of manufacture
If complex curved connections and ridged adapters are implemented, then connection between rectangular ports and coaxial guide is established, but manufacturing and assembly costs increase
Solution Approach 1:
The adapter is segmented into multiple transition sections, each with simplified geometry that is easier to manufacture than a single complex curved connection. The segmented design allows standard fabrication techniques to be used while achieving the required signal transmission performance without mismatches.
3Manufacturing precision
If manual calibration of adapter structures is performed, then signal reflection is minimized within a specific frequency range, but time and operational complexity increase
Solution Approach 1:
The adapter guide is pre-designed with optimized cross-sectional dimension variations that inherently minimize signal reflection across the operating bandwidth. This preliminary optimization during the design phase eliminates the need for time-consuming manual calibration operations while maintaining high manufacturing precision.
4Productivity
If dual-band dual-polarization multiplexing is implemented through a coaxial guide, then transmission capacity is doubled, but adaptation problems and signal interference occur
Solution Approach 1:
The adapter guide's cross-sectional parameters are optimized to support dual-band dual-polarization signals. The gradual dimensional transition minimizes signal interference by maintaining proper impedance matching across both frequency bands and both polarization modes, enabling doubled transmission capacity without adaptation problems.
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 solution simplifies the connection process, reduces manufacturing and assembly costs, and provides a wide bandwidth with improved polarization isolation, eliminating the need for manual calibration and complex adapter structures, enabling efficient dual-polarization signal transmission and reception across dual frequency bands.
Implementation Method 1
a Y-shaped guide section which divides up the signal entering a rectangular port into two corresponding signal portions which are each fed to a respective right-angled curve
Implementation Method 2
each followed by a curved transition section, the rectangular output/input port of which is connected to a respective ridgeless adapter guide section
Implementation Method 3
a ridgeless adapter guide section that gradually changes from rectangular to annular segment form
Data Source
Figure 1~6
Figure 2
Figure 3~5
AI summary
Connecting structure for transporting a signal SLBH with a first polarization (H) in a frequency band LB and a signal SLBV with a second polarization (V) in said frequency band LB to/from a coaxial guide (100), comprising for transportation of each signal: -) a Y-shaped waveguide junction (H210) with two coplanar rectangular guide output/input ports (H212,H213) for each component of the transported signal; each of the two rectangular output/input ports (H212,H213) of the Y junction (H210) having, connected thereto: -) a respective waveguide transition section (H220;H230) which has a curve (H225;H235) in a plane orthogonal to the plane of the respective downstream rectangular guide output/input port of the Y junction (H210) and parallel to the larger dimension of the said port; the curves (H225;H235) of the two transition sections (H220;H230) for transporting a respective signal of the two signals being identical, parallel and directed in a same direction and each having a same angle of between 20° and 180°'; wherein the curved transition sections (V220;V230) for transporting the components of the signal SLBV with second polarization have downstream output/input ports axially offset in a longitudinal/axial direction (X-X), orthogonal to the plane of the said output/input ports, with respect to the downstream output/input ports of the curved transition sections (H220;H230) for transporting the components of the signals SLBH with first polarization.