Rotating Polarizer for Multi-Polarized Satellite Signal Reception
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Solution Overview
Problem
Conventional satellite signal receiving systems face challenges in efficiently processing both linearly and circularly polarized waves, particularly in marine environments where polarization properties change, leading to the need for frequent converter replacements, increased complexity, and power loss due to skew angles caused by Faraday rotation.
Innovation Solution
A satellite signal receiving apparatus with a polarizer rotating device that uses a single waveguide to process both linearly and circularly polarized waves, incorporating a skew compensating device to rotate the low noise block down converter and polarizer within the waveguide, allowing automatic adjustment for skew angles and reducing component count and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate low noise block down converters are used for linearly polarized waves and circularly polarized waves, then the satellite signal can be received accurately, but the device complexity increases and maintenance becomes troublesome
Solution Approach 1:
The patent implements a single low noise block down converter that can process both linearly polarized waves and circularly polarized waves by rotating the polarizer to different orientations. This multi-functional design eliminates the need for separate converters for different polarization types, reducing device complexity and maintenance burden while maintaining accurate signal reception for both polarization modes.
2Adaptability or versatility
If waveguides are provided for individually receiving linearly polarized waves and circularly polarized waves, then both signal types can be processed, but the structure becomes complicated and size increases
Solution Approach 1:
The patent employs a rotatable polarizer within a single waveguide structure that can be dynamically adjusted to different angular positions. This dynamic configuration allows the same physical waveguide to handle both linearly and circularly polarized waves sequentially, eliminating the need for multiple fixed waveguides and reducing structural complexity while maintaining full polarization adaptability.
3Reliability
If the low noise block down converter is replaced to match polarization changes, then signal reception is optimized, but time is lost and manual work is increased
Solution Approach 1:
The system is pre-configured with a single low noise block down converter capable of handling both polarization types, and the polarizer orientation is automatically adjusted based on the received signal type. This preliminary preparation eliminates the need for manual converter replacement and associated time losses, while still optimizing signal reception by properly aligning the polarizer before processing each signal.
4Ease of manufacture
If conventional feeding systems for linearly and circularly polarized waves are simply connected, then manufacturing cost is reduced, but signal loss increases due to interference
Solution Approach 1:
The patent introduces a rotatable polarizer as an intermediary component between the single waveguide and the low noise block down converter. This polarizer mediates the signal path by selectively orienting to match the incoming polarization type, preventing interference between linearly and circularly polarized signals while maintaining a simple, cost-effective single-converter architecture. The polarizer ensures clean signal separation without requiring complex multi-path feeding systems.
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
Enables efficient, compact, and cost-effective reception of multi-polarized satellite signals by eliminating the need for separate converters and minimizing signal loss through automatic skew compensation, improving maintenance convenience and reducing manufacturing costs.
Implementation Method 1
skew compensating device that is provided at the low noise block down converter or the feedhorn and rotates the low noise block down converter or the feedhorn to compensate for a skew angle when the satellite signal received by the feedhorn is a linearly polarized wave
Implementation Method 2
polarizer that is provided within a single waveguide, to be rotated relative to the single waveguide and receives a linearly polarized signal and a circularly polarized signal of the satellite signal
Data Source
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AI summary
There are provided a polarizer rotating device and a satellite signal receiving apparatus having the same. The satellite signal receiving apparatus includes a feedhorn that receives a satellite signal; a low noise block down converter that processes the signal received by the feedhorn; a skew compensating device that is provided at the low noise block down converter or the feedhorn and rotates the low noise block down converter or the feedhorn to compensate for a skew angle when the satellite signal received by the feedhorn is a linearly polarized wave; a polarizer that receives a linearly polarized signal and a circularly polarized signal of the satellite signal; and a polarizer rotating device that rotates the polarizer when the satellite signal received by the polarizer is a circularly polarized wave. In such a simple structure, the linearly polarized wave and the circularly polarized wave are all received to be processed.