Dual-beam Antenna Phase Control for Isolation
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Solution Overview
Problem
Existing dual-beam antennas suffer from suboptimal co-polarization isolation and unstable beam directivity, particularly when using a traditional Butler matrix principle for signal processing.
Innovation Solution
The design incorporates independent element sets and feed networks for forming separate beams, utilizing power dividers and cable sets to adjust signal phases, ensuring ideal co-polarization isolation and stable directivity by optimizing cable lengths and phase settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional Butler matrix principle is used for signal processing, then the antenna can form dual beams, but the co-polarization isolation becomes suboptimal and beam directivity becomes unstable
Solution Approach 1:
The antenna system is divided into independent first and second antenna assemblies, each with separate feed networks. The first feed network includes a first power divider and cable sets connected to first antenna elements, while the second feed network includes a second power divider and cable sets connected to second antenna elements. This segmentation allows independent optimization of each beam path, improving co-polarization isolation and beam directivity stability.
Solution Approach 2:
Different cable lengths are used in the first and second cable sets to provide local phase adjustments. The first cable set has a first cable length and the second cable set has a second cable length, allowing precise control of signal phases at each antenna element position. This local quality variation enables optimal beam forming with stable directivity and high co-polarization isolation.
2Reliability
If independent element sets and feed networks are used for each beam, then co-polarization isolation and beam directivity stability improve, but device complexity increases
Solution Approach 1:
The feed network is segmented into a first feed network and a second feed network, with each having its own power divider and cable sets. This segmentation enables independent phase and amplitude control for each beam, achieving superior co-polarization isolation while maintaining a systematic and manageable structure.
Solution Approach 2:
The patent utilizes parameter changes in cable lengths (first cable length vs. second cable length) to achieve different phase shifts for the two beams. By adjusting these physical parameters, the system optimizes co-polarization isolation and beam directivity without requiring complex active phase shifters or sophisticated control electronics.
3Reliability
If cable lengths and phase settings are optimized, then beam directivity stability and co-polarization isolation improve, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs specific cable length parameters (first cable length and second cable length) as fixed design parameters that can be precisely controlled during manufacturing. By optimizing these parameters in the design stage, the system achieves stable beam directivity and high co-polarization isolation with reasonable manufacturing tolerances, avoiding the need for complex active adjustment mechanisms.
Data Source
AI summary
A dual-beam antenna includes an element array and a feed network. The element array includes a first element set and a second element set. The first element set includes at least three first elements arranged in a row. The second element set includes at least three second elements arranged in a row. The at least three first elements of the first element set and the at least three second elements of the second element set are independent of each other. The feed network includes a first feed network and a second feed network. The first feed network includes a first cable set and a first power divider. The second feed network includes a second cable set and a second power divider.