Dual Reflective Surface Satellite Payload for Multi-Band Beamforming
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Solution Overview
Problem
Current satellite telecommunications systems face challenges in increasing capacity and flexibility while maintaining a compact, lightweight, and low-complexity design, especially when operating in frequency bands with significant separation between transmission and reception frequencies, such as Ku, Ka, Q, or V bands, which often require multiple networks and reflectors, increasing complexity, mass, and volume.
Innovation Solution
A satellite payload design featuring a reflector with two reflective surfaces of different curvatures, where one surface is transparent to signals in one frequency band and reflective in another, allowing a single network of sources to form beams in both bands with similar geographical coverage, reducing the number of sources and reflectors needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single network of sources and a single reflector are used to operate in both transmission and reception in frequency bands with great separation between transmission and reception sub-bands, then the complexity, mass, and volume of the payload are reduced, but it becomes difficult to achieve proper beam formation and frequency selectivity for both bands simultaneously
Solution Approach 1:
The reflector surface is segmented into multiple zones, each zone being responsible for reflecting signals in specific frequency bands. This segmentation allows different parts of the reflector to handle different frequency bands independently, enabling a single reflector to support multiple bands with great frequency separation while maintaining proper beam formation for each band
Solution Approach 2:
Different zones of the reflector surface are assigned different local properties (curvatures) optimized for specific frequency bands. Each zone's curvature is designed to match the focal requirements of particular transmission and reception bands, allowing the reflector to achieve frequency-selective beam formation without requiring separate reflectors for each band
2Adaptability or versatility
If multiple networks of sources and/or multiple reflectors are used to operate in transmission and reception in frequency bands with great separation, then frequency selectivity and beam formation are improved, but the complexity, mass, and volume of the payload considerably increase
Solution Approach 1:
The reflector is designed to perform multiple functions simultaneously - it serves as both a transmission reflector and a reception reflector for different frequency bands. The segmented surface with different curvatures allows a single universal reflector structure to replace what would traditionally require multiple separate reflectors, thereby reducing payload mass while maintaining frequency band adaptability
Solution Approach 2:
Multiple reflector functions are merged into a single reflector structure. By combining transmission and reception reflection capabilities in one unified reflector with frequency-selective zones, the design eliminates the need for separate reflector assemblies, reducing overall payload mass, volume, and complexity
3Adaptability or versatility
If multiple networks of sources and/or multiple reflectors are used to operate in transmission and reception in frequency bands with great separation, then frequency selectivity and beam formation are improved, but the complexity, mass, and volume of the payload considerably increase
Solution Approach 1:
The reflector zones with different curvatures are arranged in a nested or layered configuration on the same reflector surface. This nesting allows multiple frequency band handling capabilities to be packed into a single compact reflector structure, reducing the volume occupied by what would traditionally require multiple separate reflector assemblies
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
This design enhances flexibility and capacity while minimizing complexity, mass, and volume by allowing a single network of sources to handle signals in multiple frequency bands, achieving similar geographical coverage in both transmission and reception with reduced hardware requirements.
Implementation Method 1
The reflective surface closer to the network of sources is transparent for all the signals transported on the band B2 and suitable for reflecting signals transported in the band B1
Implementation Method 2
The other reflective surface is suitable for reflecting signals transported in the band B2
Implementation Method 3
Each reflective surface produces an image of the network of sources with a different magnification factor
Data Source
AI summary
A satellite payload (20) including a reflector (22), a network (23) of sources (24) and a beam forming network connected to said sources in order to form beams for carrying signals in a first frequency band, called “band B1”, and in a second frequency band, called “band B2”. The reflector comprises two reflective surfaces (22a, 22b) positioned one behind the other in relation to the network of sources and having different curvatures so that each reflective surface generates an image of the network of sources with a different magnification factor. The reflective surface closest to the network of sources is transparent for all the signals carried on the band B2 and is adapted to reflect signals carried in the band B1. The other reflective surface is adapted to reflect signals carried in the band B2.