Rotatable Depolarizer for Satellite Polarization Switching
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Solution Overview
Problem
Existing satellite TV systems require physical replacement or complex rotation of the LNB to adapt to different polarizations of satellite signals between Europe and the USA, leading to inefficiencies and increased costs, especially on vessels that roll, as they need to switch between linearly and circularly polarized radiation.
Innovation Solution
A rotatable depolarizer and LNB system using a single motor/actuator to adjust the polarization, allowing seamless conversion between linear and circular polarization modes, with a mechanism for releasable fixing and controlled rotation to maintain optimal polarization alignment with the satellite signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single motor/actuator is used to rotate both the LNB and depolarizer together, then the device complexity is reduced and cost is lowered, but the ability to independently adjust polarization modes is limited
Solution Approach 1:
The patent combines the LNB and depolarizer into a single rotatable assembly that functions together as one unit. By merging these two components and rotating them simultaneously with a single motor, the system reduces component count and complexity while maintaining the ability to switch between linear and circular polarization modes through the integrated depolarizer element.
Solution Approach 2:
The rotatable assembly serves multiple functions: it acts as both the LNB (low noise block converter) and incorporates a depolarizer that can convert between linear and circular polarization. This multi-functional design allows a single mechanism to handle both signal reception and polarization conversion, eliminating the need for separate adjustment mechanisms.
2Adaptability or versatility
If the depolarizer is positioned at 45° to the polarization direction, then circularly polarized radiation can be converted to linearly polarized radiation, but the depolarizer becomes visible to the radiation and may cause signal loss
Solution Approach 1:
The depolarizer's orientation is made dynamic rather than fixed. By rotating the depolarizer to different angular positions (0°, 45°, 90°) depending on the required polarization mode, the system optimizes performance for each mode: at 45° for conversion efficiency, and at 0° or 90° for minimal interference with linearly polarized signals.
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 and cost-effective adaptation to different polarizations without physical replacement, simplifying the design and operation, particularly on vehicles that roll, by allowing the depolarizer and LNB to rotate together, ensuring reliable signal reception and transmission across varying polarization conditions.
Implementation Method 1
the depolarizer is 45° to the polarization direction of the detector in order to convert the circularly polarized radiation to linearly polarized radiation before detection
Implementation Method 2
a device having a single motor/actuator for rotating the depolarizer as well as the LNB and depolarizer together
Data Source
Figure 1
Figure 2~3
AI summary
A system for receiving a signal from one or more satellites or for transmitting a signal to one or more satellites and a method of operating the system, the system comprising a frame, a signal converter for converting between a received/transmitted signal and a corresponding signal, the converter being positioned, in relation to the frame, rotational around a predetermined axis, and a depolarizer mounted, in relation to the frame, rotational around the predetermined axis, the method comprising the sequence of steps of rotating one of the converter and the depolarizer independently of the other of the converter and the depolarizer, fixing the depolarizer in relation to the converter at a predetermined rotational relationship and rotating both the converter and the depolarizer.