Dual-Polarization Waveguide Power Divider for Tight Array Spacing
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Solution Overview
Problem
Current dual-polarization four-way waveguide power dividers are either complex or unable to reduce element spacing in array antennas below a certain threshold, particularly for space-segment active antennas, and lack compatibility with compact manufacturing techniques like 3D printing.
Innovation Solution
A waveguide power divider device featuring four two-port orthomode junctions arranged in a square or rectangular configuration, coupled by E-plane T-junctions and waveguide twists, allowing for small element spacing and compatibility with 3D printing, enabling dual-polarization operation and scalable array antenna designs without horns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If current dual-polarization four-way waveguide power divider designs are used, then power division function is achieved, but device complexity increases and element spacing cannot be reduced below one wavelength
Solution Approach 1:
The power divider is segmented into four separate two-port orthomode junctions arranged in a square configuration, each handling a specific polarization and port combination. This segmentation allows independent optimization of each junction and enables compact routing of waveguides between them, reducing overall element spacing while maintaining functionality.
Solution Approach 2:
The orthomode junctions are arranged in a two-dimensional square array rather than a linear configuration. This spatial arrangement in another dimension allows for optimized waveguide routing paths between junctions, enabling element spacing reduction below one wavelength while keeping the device structure manageable.
2Length of moving object
If conventional horn designs with high aperture efficiency are used, then aperture efficiency is maintained, but radiating element length increases to 2-3 times aperture diameter
Solution Approach 1:
The aperture is divided into four smaller radiating elements corresponding to the four orthomode junctions, each with its own optimized feed structure. This segmentation allows each element to be shorter while collectively maintaining the required aperture efficiency through proper phase and amplitude distribution across the array.
Solution Approach 2:
The four-way power divider acts as an intermediary device that distributes power to four separate radiating elements with precise amplitude and phase control. This mediation enables compact element design while maintaining overall aperture efficiency through coherent combination of signals from all four elements.
3Ease of manufacture
If complex power divider designs are used, then dual-polarization four-way power division is achieved, but compatibility with 3D printing manufacturing is reduced
Solution Approach 1:
Multiple functional components (orthomode junctions, waveguide sections, coupling structures) are merged into a single monolithic waveguide structure that can be manufactured in one piece using 3D printing. This merging eliminates the need for complex assembly of multiple separate parts while maintaining the required dual-polarization four-way power division functionality.
Solution Approach 2:
The monolithic waveguide structure performs multiple functions simultaneously: it provides dual-polarization separation, four-way power division, and compact routing all within a single printed component. This multi-functionality reduces manufacturing complexity compared to assembling multiple specialized components.
Data Source
AI summary
A waveguide power divider device comprises four two-port orthomode junctions arranged with their common waveguides extending in parallel, wherein the two ports of each orthomode junction extend in orthogonal directions, four E-plane T-junctions, each T-junction coupling two of the four orthomode junctions to each other via respective ones of their ports, a four-port turnstile junction, wherein waveguides of the four ports are bent to extend in parallel to an extension direction of a common waveguide of the turnstile junction, and four waveguide twists, each waveguide twist coupling a common waveguide of a respective one of the T-junctions to the waveguide of a respective one of the ports of the turnstile junction, with broad walls of the common waveguide of the T-junction and of the waveguide of the port of the turnstile junction being orthogonal to each other. An array antenna may include one or more such waveguide power divider devices.