Integrated Stripline Feed Network for Linear Antenna Arrays
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Solution Overview
Problem
Current ground reference antennas, such as those used in LAAS and GBAS, face challenges with complex and costly feed networks due to the need for phase stability, space for signal isolation, and complex assembly processes, particularly with microstrip lines and striplines.
Innovation Solution
An integrated stripline feed network is coupled to a linear antenna array within its support body, using power distribution units and phase delay units to maintain phase stability without the need for matched length coaxial cables, allowing for a compact and cost-effective design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feed network is kept outside the antenna in an independent box with RF cables, then phase stability is maintained, but the device complexity and cost increase
Solution Approach 1:
The patent integrates the feed network directly into the antenna structure, merging previously separate components (feed network board and antenna elements) into a unified assembly. This integration eliminates the need for external RF cables and independent housing, reducing device complexity while maintaining phase stability through built-in phase delay units and direct signal distribution paths.
Solution Approach 2:
The patent introduces stripline structures as intermediary elements within the antenna support body to transmit and control signals between the feed network and antenna elements. These striplines serve as integrated transmission media that replace external RF cables, providing controlled impedance and phase delay functionality directly within the antenna structure.
2Reliability
If matched length coaxial cables are used to maintain phase stability, then phase delay is controlled, but the device size and assembly complexity increase
Solution Approach 1:
The patent replaces mechanical coaxial cable assemblies with integrated stripline structures fabricated on circuit boards. This substitution eliminates the need for manual cable routing and length matching, as phase delay is controlled through the inherent electrical length of the stripline traces, which can be precisely designed and manufactured as part of the rigid circuit board structure.
Solution Approach 2:
The patent incorporates phase delay units and signal distribution paths directly into the antenna structure during manufacturing. This preliminary integration of phase control functionality eliminates the need for post-assembly cable length adjustments and ensures consistent phase stability from the outset, rather than requiring precise mechanical cable installation.
3Productivity
If microstrip lines and striplines are used in the feed network, then signal distribution is achieved, but space for signal isolation and coupling to feed lines becomes problematic
Solution Approach 1:
The patent utilizes multi-layer circuit board construction to route signal paths in three dimensions. Stripline structures are embedded between ground planes on different layers, allowing signal distribution without requiring large lateral spacing. This vertical dimensionality enables compact integration of feed network functions while maintaining necessary signal isolation through grounded layers and controlled trace routing.
Data Source
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Figure 2A
AI summary
An embodiment of an integrated stripline feed network for a linear antenna array comprises a power distribution network coupled to the linear antenna array; a feed signal input/output component coupled to the power distribution network; wherein the input/output component receives a feed signal and splits the feed signal for distributing to a plurality of antenna elements of the linear antenna array through the power distribution network. The integrated stripline feed network is configured to be integrated into a support body of the linear antenna array, wherein, the support body structurally supports the linear antenna array.