Pinwheel Wilkinson Power Divider for Millimeter Wave Isolation
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Solution Overview
Problem
Existing Wilkinson power dividers for millimeter wave applications face challenges in achieving balanced and isolated operation, particularly in symmetric configurations, which is crucial for efficient signal distribution and combination in radio frequency communication and phased array systems.
Innovation Solution
A three-way Wilkinson power divider design featuring a distribution port layer and a common port layer separated by an insulating material layer, with symmetrically arranged distribution legs and isolation resistors positioned at a quarter wavelength relative to the center hub, and a conductive common port leg for enhanced matching and isolation, utilizing curved resistor leads to form a circular ring for improved isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Wilkinson power dividers are used for millimeter wave applications, then signal distribution function is achieved, but isolated and balanced operation cannot be achieved
Solution Approach 1:
The patent applies asymmetry principle by using a non-circular (e.g., rectangular or elliptical) cross-section for the common port leg, distinguishing it from the circular distribution legs. This asymmetric geometric configuration enables the common port leg to support only TE11 mode while distribution legs support TE10 mode, achieving mode isolation and balanced operation without requiring complex additional isolation structures.
Solution Approach 2:
The patent applies local quality principle by positioning isolation resistors at specific locations (e.g., at the junction between common port leg and distribution legs, or at specific distances from the center hub) and using different resistor values for different positions. This localized optimization of resistor placement and value achieves enhanced isolation between distribution ports while maintaining overall system symmetry.
2Reliability
If isolation resistors are added between distribution legs, then isolation between ports is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The non-circular common port leg geometry inherently creates different electromagnetic field distributions and impedance characteristics compared to circular distribution legs. This geometric asymmetry provides natural mode differentiation that reduces the isolation requirement on resistors, allowing for more relaxed resistor placement tolerances and simpler manufacturing.
Solution Approach 2:
The patent merges the isolation function with the existing structural elements by integrating isolation resistors into the junction regions or along the legs that already exist in the design. Rather than adding separate isolation structures, the resistors are incorporated into the existing geometric framework, simplifying manufacturing while achieving isolation.
3Reliability
If multi-layer structure is used to achieve symmetry, then isolated and balanced operation is improved, but device complexity and fabrication difficulty increase
Solution Approach 1:
The asymmetric cross-section of the common port leg enables balanced operation on a single layer by creating inherent mode differentiation. This eliminates the need for multi-layer structures to achieve symmetry, as the geometric asymmetry itself provides the necessary field distribution control for balanced operation.
Solution Approach 2:
The patent transitions from achieving symmetry through multi-layer (vertical dimension) configurations to achieving balanced operation through cross-sectional geometry (horizontal dimension) asymmetry. By optimizing the cross-sectional shape of the common port leg, the patent achieves isolation and balance effects that would otherwise require complex multi-layer arrangements.
Data Source
AI summary
A symmetric, multi-layer, three-way power divider that is equally balanced, with resistors placed between all combinations of legs. This three-way power divider is specifically designed to be used in millimeter wave applications (e.g., 5G in the 20 GHz-40 GHz range for both dual and single polarization), specifically in designs where a common signal is distributed to a multiple of three elements. This three-way power divider also can be useful for addressing space constraints in 5G applications, e.g., due to routing limitations.