Rotatable Antenna Radiator for Polarization Alignment
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Solution Overview
Problem
Over-the-horizon communication systems face significant transmission loss due to polarization plane misalignment between unfixed communication devices, leading to communication incapability, as existing technologies assume predetermined communication device orientations and fixed polarization planes.
Innovation Solution
An antenna device with a reflecting mirror, primary radiator, rotatable support mechanism, tilt sensor, and polarization plane adjustment system that acquires and adjusts polarization plane data based on tilt and reception level evaluation to efficiently align polarization planes between communication devices performing bidirectional communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If polarization plane adjustment is performed freely to maximize reception level, then reception sensitivity is improved, but adjustment processing cannot be terminated because mutual communication devices try to adjust to each other's polarization directions
Solution Approach 1:
The invention performs preliminary action by having the transmission device determine its polarization direction in advance and notify the reception device. The reception device then uses this predetermined information to adjust its polarization plane, avoiding the need for continuous mutual adjustment. This preliminary determination of transmission polarization direction prevents the infinite adjustment loop while ensuring optimal reception sensitivity.
2Adaptability or versatility
If communication devices are designed to be mobile with unfixed installation places, then adaptability is improved, but polarization plane alignment becomes difficult leading to transmission loss
Solution Approach 1:
The invention applies dynamics by enabling the polarization plane adjustment mechanism that adapts to different installation conditions. The reception device can dynamically adjust its polarization plane based on the notified transmission polarization direction, regardless of installation location or orientation. This dynamic adjustment capability maintains optimal polarization alignment even when devices are moved to unfixed locations, thereby reducing transmission loss while preserving installation flexibility.
Solution Approach 2:
The invention uses feedback by having the transmission device notify the reception device of its polarization direction through communication. This feedback mechanism allows the reception device to adjust its polarization plane accordingly, ensuring proper alignment even when both devices have unfixed installation places. The feedback loop enables adaptive polarization matching without requiring fixed installation orientations.
3Reliability
If polarization plane adjustment is performed in bidirectional communication, then communication reliability is improved, but both devices performing adjustment causes processing to not terminate
Solution Approach 1:
The invention resolves the bidirectional adjustment problem by having the transmission device perform preliminary determination of its polarization direction and notify the reception device. The reception device then adjusts based on this predetermined information, eliminating the need for both devices to perform simultaneous adjustment. This asymmetric approach maintains communication reliability while simplifying the control logic to avoid non-terminating processing.
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 adjustment of polarization planes between communication devices with unfixed installations, reducing transmission loss and ensuring reliable communication by dynamically aligning polarization planes according to tilt and reception level data.
Implementation Method 1
a tilt sensor configured to detect a polarization direction angle of the primary radiator that is a tilt angle of a polarization plane of the primary radiator or an angle of the support mechanism to the horizontal plane
Implementation Method 2
a reflecting mirror configured to focus a received radio wave into a predetermined focusing position
Data Source
Figure 1~2
Figure 3A~3B
Figure 3C~3D
AI summary
An antenna device 10 includes a reflecting mirror, a primary radiator connected with a wireless device including a transmitter and a receiver, a radiator support mechanism that rotatably supports the primary radiator at a focusing position of the reflecting mirror with respect to a central axis of the primary radiator, evaluation data acquisition means 101 that acquires evaluation data that is data regarding a polarization direction angle that is a tilt angle of a polarization plane of the primary radiator with respect to a horizontal direction, a tilt angle of its own device correlated with the polarization direction angle, or a detection level, polarization plane adjustment means 103 that adjusts the polarization plane of the primary radiator based on the evaluation data, trigger input means 102 that inputs a trigger to the polarization plane adjustment means 103, wherein the polarization plane adjustment means 103 rotates the primary radiator to adjust the polarization plane of the primary radiator according to timing provided by the trigger.