Stack Antenna Array Layout for Wideband Circular Polarization
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Solution Overview
Problem
Current satellite communication technologies face challenges in achieving high-capacity, miniaturized, and low-profile antennas with high purity circular polarization for CubeSats, which are essential for efficient communication links and wave propagation through atmospheric media.
Innovation Solution
A wideband right-hand circularly polarized 16-element stack antenna array is designed using sequential rotation power dividers and a stack assembly topology with continually orthogonal element placement, employing truncated rectangular patches and a bottom-feeding network to achieve low axial ratio, high gain, and reduced side lobes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If truncated rectangular patches with narrow circular polarization tendency band are used, then circular polarization is achieved, but the operating bandwidth is limited
Solution Approach 1:
The patent combines multiple rectangular patches oriented at different angles (0°, 45°, 90°, 135°) into a single antenna element. Each patch contributes to circular polarization across different frequency ranges, and their combined effect achieves wideband circular polarization with high purity throughout the entire Ka-band operating range, resolving the contradiction between narrow bandwidth and polarization purity.
Solution Approach 2:
The patent employs a sequential rotation feeding network that dynamically adjusts the phase and amplitude of signals fed to each patch element. This dynamic control enables the antenna to maintain high circular polarization purity across a wide frequency bandwidth by adaptively compensating for polarization degradation at different frequencies.
2Shape
If planar antenna arrays with broadside radiation pattern are used, then low-profile structure and high gain are achieved, but circular polarization purity deteriorates due to wave depolarization
Solution Approach 1:
The patent implements different patch orientations (0°, 45°, 90°, 135°) at different spatial positions within the antenna element. Each locally oriented patch maintains optimal circular polarization characteristics for its specific orientation, and the combination of all patches preserves high polarization purity across the entire low-profile planar structure, preventing wave depolarization.
3Weight of moving object
If miniaturized antennas are designed for CubeSats, then size and weight are reduced, but antenna gain and performance are compromised
Solution Approach 1:
The patent integrates the feeding network, power dividers, and multiple patch elements into a compact nested structure where components are arranged in multiple layers and closely spaced. This nesting approach achieves miniaturization suitable for CubeSats while maintaining high gain through the combined radiation of multiple elements and constructive interference patterns.
Solution Approach 2:
The patent transitions from a single-layer planar antenna to a multi-layer three-dimensional structure with patches arranged at different heights and orientations. This dimensional expansion allows the miniaturized antenna to achieve high gain through spatial diversity and constructive interference in multiple dimensions, overcoming the gain limitations typically associated with small antenna size.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a compact antenna with exceptional performance, including a low axial ratio, high gain, and efficient radiation patterns, with a wide operating range and high cross-polarization discrimination, suitable for CubeSat applications.
Implementation Method 1
A wideband right hand circularly polarized antenna array having sequential rotation power dividers
Implementation Method 2
employing truncated rectangular patches and a bottom-feeding network
Data Source
AI summary
A circularly polarized antenna having a plurality of arrays. The arrays comprised of a plurality of antenna elements which are consecutively orthogonal to each other.