Rotating Polarizer Phase Control Element for Low-Loss Antennas
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Solution Overview
Problem
Current phase control elements for antennas, particularly in the GHz frequency range, suffer from significant signal loss, high costs, and inability to reliably determine the instantaneous phase position of signals, making them inefficient and expensive for applications like mobile carriers and satellite communications.
Innovation Solution
A controllable phase control element comprising a drive unit and holder with at least two polarizers that convert circularly polarized signals to linearly polarized signals, allowing for precise phase adjustment through rotation, operating with minimal losses and enabling instantaneous phase determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional phase actuators (solid-state, MEMS, liquid crystal) are used, then phase control functionality is achieved, but signal loss increases significantly
Solution Approach 1:
The patent replaces conventional solid-state/MEMS/liquid crystal phase actuators with a mechanically rotating polarizer system. The phase shift is achieved by physically rotating the polarizer assembly, which modulates the electromagnetic wave polarization state without dissipative electronic components, thereby reducing signal loss while maintaining phase control functionality.
Solution Approach 2:
The invention changes the operating parameter from electrical control of nonlinear materials to mechanical rotation angle control. By varying the rotation angle of the polarizer assembly, the phase shift is controlled without the energy dissipation inherent in solid-state phase actuators, resolving the contradiction between low signal loss and reliable phase control.
2Reliability
If conventional phase actuators are used, then phase control is achieved, but the cost increases significantly
Solution Approach 1:
The patent employs simple, inexpensive components (polarizers mounted on a rotating holder) instead of expensive solid-state phase actuators. The mechanical rotating assembly can be manufactured at low cost, making the system economically viable for civilian applications above 10 GHz where conventional solutions are prohibitively expensive.
3Measurement precision
If conventional phase actuators are used, then phase control is achieved, but instantaneous phase position determination becomes unreliable
Solution Approach 1:
The patent incorporates a feedback mechanism where the rotation angle of the polarizer assembly is precisely measured and fed back to the control system. This allows instantaneous and reliable determination of the phase position, as the mechanical rotation angle directly correlates with the phase shift applied to the signal, enabling accurate phase control for regulatory compliance.
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 exact control over signal phase with minimal losses, supports efficient and cost-effective phase control, and allows for reliable instantaneous phase determination, enhancing antenna array performance and regulatory compliance.
Implementation Method 1
Each polarizer (4) is designed such that it can convert a circularly polarized signal into a linearly polarized signal
Implementation Method 2
The drive unit (2) is designed such that the holder (3) can be rotated. Thus the polarizers (4) are rotated as well, specifically by an angle which can be selected freely and which adjusts the phase of the signal as desired
Data Source
AI summary
A controllable phase control element comprises a drive unit and a holder, to which at least two polarizers are attached, which are arranged one behind the other in the direction of incidence of a wave. Each polarizer is designed in such a way that the polarizer can convert a circularly polarized signal into a linearly polarized signal. The drive unit is designed in such a way that the holder and thus the polarizers can be mounted over a freely selectable angular range.