Hierarchical Signal Routing for Broadband Phased Array Power Splitting
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Solution Overview
Problem
Phased array antenna systems face challenges in achieving increased bandwidth while maintaining a high main lobe to side lobe power ratio, while also requiring reduced weight, size, and manufacturing cost, and lower power requirements.
Innovation Solution
The implementation of a substrate with a hierarchical network signal routing system, including a power splitter/combiner with electrically conductive traces in multiple layers, where signal pathways are quarter wavelength lengths, and vias connect the traces across layers to form a compact and efficient phased array antenna system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a phased array antenna system uses traditional signal routing configurations, then the system can achieve basic signal distribution, but the bandwidth is limited and the main lobe to side lobe power ratio cannot be optimized
Solution Approach 1:
The patent transitions from planar signal routing to three-dimensional hierarchical routing by stacking multiple layers (first layer, second layer, third layer) with vertical vias connecting them. This dimensional expansion enables independent optimization of signal paths for different frequency components, achieving broadband performance while maintaining precise control over radiation patterns and power distribution.
Solution Approach 2:
The signal routing is segmented into multiple hierarchical levels with distinct functions: the first layer handles initial signal distribution, the second layer provides intermediate routing with quarter-wavelength paths, and the third layer delivers final signal delivery to antenna elements. This segmentation allows each layer to be optimized independently for specific frequency ranges, expanding overall bandwidth while maintaining precise power control.
2Reliability
If the phased array antenna system increases size and weight to improve performance, then signal quality can be enhanced, but the system becomes more complex and costly to manufacture
Solution Approach 1:
Multiple signal routing functions are merged into a compact hierarchical structure where layers are stacked vertically with shared via connections. The power splitter/combiner functionality is integrated across layers, combining signal distribution, power control, and routing functions in a space-efficient configuration that reduces overall system weight while maintaining high signal quality.
Solution Approach 2:
The patent implements a nested hierarchical structure where the second layer is positioned within the vertical space between the first and third layers. Signal paths are nested within each other, with vias providing vertical connections that pass through intermediate structures. This nesting achieves complex signal routing in a compact volume, reducing system weight and footprint.
3Adaptability or versatility
If traditional power distribution methods are used, then the system can operate at basic power levels, but bandwidth expansion compromises the main lobe to side lobe power ratio
Solution Approach 1:
Different regions of the hierarchical routing structure provide different power distribution characteristics. The quarter-wavelength signal paths in the second layer are specifically designed to provide precise phase and amplitude control for main lobe formation, while the hierarchical structure naturally provides power tapering to suppress side lobes. Each layer and via connection is optimized for its specific local function in power distribution.
Data Source
AI summary
In some embodiments, an apparatus includes a first layer having a first plurality of electrically conductive traces comprising a first portion of a plurality of hierarchical networks; a second layer having a second plurality of electrically conductive traces comprising a second portion of the plurality of hierarchical networks; and a plurality of vias electrically connecting the first plurality of electrically conductive traces of the first layer to the respective second plurality of electrically conductive traces of the second layer to define the plurality of hierarchical networks. The first plurality of electrically conductive traces is orientated in a first direction and the second plurality of electrically conductive traces is orientated in a second direction different from the first direction.