Multiport Amplifier Output Filtering for Satellite Isolation
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Solution Overview
Problem
Multi-port amplifiers (MPAs) in satellite communication payloads face performance degradation due to gain and phase variations over time, requiring costly and complex calibration and compensation schemes to prevent leakage and interference, especially at high-frequency bands like Ku band.
Innovation Solution
Incorporating output filters in the power amplification arrangement, which includes multi-port amplifiers, to achieve a carrier-to-isolation ratio of at least 30 dB between adjacent transmit antenna feeds, thereby reducing the need for calibration and compensation of gain and phase variations, and utilizing digital channelizers to process and route signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If calibration and compensation schemes are implemented to correct gain and phase variations, then performance stability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and removes the complex calibration and compensation schemes from the MPA system. Instead of implementing active correction mechanisms, the invention accepts the gain and phase variations as inherent characteristics and designs the system to function reliably without them, thereby eliminating the complexity and cost associated with these schemes.
Solution Approach 2:
The MPA system is designed to be self-sufficient by not requiring external calibration and compensation mechanisms. The system naturally handles performance variations through its inherent design, making it self-service in maintaining acceptable performance levels without additional complex subsystems.
2Object-generated harmful factors
If output filters are added to achieve high carrier-to-isolation ratio, then interference is reduced, but device complexity increases
Solution Approach 1:
The output filtering arrangement is designed to serve multiple functions simultaneously: it provides carrier-to-isolation ratio enhancement, reduces interference and multipath effects, and maintains system performance without requiring separate dedicated filtering subsystems for each function, thereby minimizing overall device complexity.
Solution Approach 2:
The patent combines the filtering function directly into the output stage of the MPA system, merging the interference reduction capability with the existing signal path rather than adding separate standalone filtering subsystems, thus achieving high carrier-to-isolation ratio with minimal additional complexity.
3Productivity
If MPA is used to share power amongst multiple beams, then power utilization efficiency is improved, but performance degradation due to gain and phase variations worsens
Solution Approach 1:
The patent addresses performance degradation by accepting and working with the natural gain and phase variation parameters of the MPA system rather than attempting to correct them. The design adjusts other system parameters to compensate, maintaining power utilization efficiency while achieving acceptable performance stability without complex correction schemes.
Data Source
AI summary
A payload subsystem of a satellite includes a plurality of transmit antenna feeds, a plurality of frequency filters, and a power amplification arrangement including a plurality of power amplifiers. The power amplification arrangement has at least one multiport amplifier, the multiport amplifier including a plurality of output ports, each output port coupled with a respective one of the plurality of transmit antenna feeds by way of a respective one of the plurality of frequency filters.