Interlaced Polarized Multi-Beam Antenna Reducing Butler Matrix Stages
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cross-polarization multi-beam antenna systems face challenges such as increased complexity, high insertion loss, and interference between adjacent beams due to the need for multiple stages of Butler matrices, which complicates machining and reduces performance.
Innovation Solution
An interleaved polarized multi-beam antenna design that uses two Butler matrices with dual-polarized antenna elements, where each Butler matrix generates beams with unique polarization characteristics, reducing the number of stages and interference by alternating the polarization of adjacent beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a cross-polarization multi-beam antenna system uses multiple stages of Butler matrices to form a large quantity of beams, then the number of beams increases, but the machining difficulty and network loss significantly increase
Solution Approach 1:
The patent divides the dual-polarized antenna array into two separate single-polarized antenna arrays (first and second antenna arrays). Each array is connected to its own Butler matrix, allowing independent beam formation. This segmentation reduces the complexity of the overall system by avoiding the need for a single large multi-stage Butler matrix, while still enabling the formation of multiple beams through coordinated operation of the two simpler matrices.
2Quantity of substance
If a cross-polarization multi-beam antenna system uses multiple stages of Butler matrices, then more beams can be formed, but the network loss significantly increases
Solution Approach 1:
By segmenting the system into two separate Butler matrices each handling fewer stages, the signal path length through passive components is reduced. Each Butler matrix operates with fewer transformation stages, minimizing cumulative insertion loss while maintaining the capability to form multiple beams through the combined output of both arrays.
3Quantity of substance
If a Butler-type matrix is used to form multiple beams, then beam formation is achieved, but sidelobe levels of lateral beams are higher causing interference between adjacent multiplexed beams
Solution Approach 1:
The patent assigns different polarization characteristics to different beam groups. The first antenna array produces beams with one polarization orientation while the second antenna array produces beams with orthogonal polarization orientation. This local differentiation of polarization quality allows adjacent beams to be spectrally and spatially separated, reducing sidelobe interference between multiplexed beams while maintaining high directional gain.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Embodiments of the present invention disclose an interleaved polarized multi-beam antenna, including: at least one dual-polarized antenna element, where the dual-polarized antenna element includes a +45-degree-polarized first antenna element and a -45-degree-polarized second antenna element; and a first Butler matrix and a second Butler matrix, where the first Butler matrix is connected to the first antenna element so that the first antenna element transmits a first target beam, and the second Butler matrix is connected to the second antenna element so that the second antenna element transmits a second target beam. The first target beam and the second target beam in the embodiments are alternately arranged, and any two adjacent first target beam and second target beam have different polarization characteristics; therefore, complexity, a loss, and costs of implementation of a Butler matrix can be effectively reduced, and interference between adjacent multiplexed beams can be effectively decreased.