Array Antenna Beam Phasing for Short-Range Power Transfer
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Solution Overview
Problem
When a wireless power receiver is mounted on an airplane, the distance difference between multiple antenna elements and the power receiver is negligible, leading to a smaller phase shift, but at short distances, the phase shift increases, causing reduced power reception efficiency and interference with surrounding devices.
Innovation Solution
An antenna device with a bidimensionally arranged array antenna, phase adjusters, and a controller that adjusts phases based on acquired images and elevation angles to match transmission power signals, using phase data to suppress signal reflections and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power is transmitted from multiple antenna elements at short distance, then power transmission capability is improved, but phase shift increases causing reduced power reception efficiency
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the phase of transmission power signals based on the distance between the feed device and power receiver. When distance decreases, the system increases phase adjustment to compensate for the increased phase shift, maintaining optimal power reception efficiency across varying transmission distances
Solution Approach 2:
The system implements dynamics by making the phase adjustment adaptive rather than fixed. The phase adjuster dynamically modifies signal phases in response to changing transmission distances, allowing the system to optimize performance for both short and long distance transmissions
2Power
If power is transmitted from multiple antenna elements at short distance, then power transmission capability is improved, but interference with surrounding devices increases
Solution Approach 1:
The patent applies local quality by directing power transmission in a focused, localized manner using phase-adjusted beam forming. This concentrates the transmitted power in a specific direction toward the intended power receiver while minimizing radiation in other directions, thereby reducing interference with surrounding devices
Solution Approach 2:
The system segments the transmission space by using multiple antenna elements with independent phase control to create directional beams. This segmentation allows power to be transmitted selectively to specific locations while leaving other areas unaffected, reducing unwanted interference
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 enhances power reception efficiency and reduces interference by aligning phases and controlling signal reflections within a predetermined angle range, ensuring efficient power transmission and minimizing interference with other devices.
Implementation Method 1
an array antenna 110 including multiple antenna elements 111 that are bidimensionally arranged
Implementation Method 2
a phase adjuster 120 configured to adjust phases of transmission power signals that are respectively supplied by the multiple antenna elements
Data Source
AI summary
An antenna device includes an array antenna; a phase adjuster; and circuitry configured to acquire, based on a second position, an elevation angle of a projected position that is obtained by projecting a first position of a marker included in an image onto a second plane including a first axis and a third axis, the elevation angle being relative to the third axis of the second plane. The circuitry is configured to control the phase adjuster such that a direction of a beam, emitted by the array antenna based on retrieved phase data, defines the elevation angle for the second plane, the phase data relating to elevation angles that are within a predetermined included angle range.