Array Antenna Phase Shifter Switching for Faster Beam Scanning
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Solution Overview
Problem
Variable dielectric constant (VDC) antennas face asymmetrical response times in turning on and off, with turn-off response (Tfall) being significantly slower than turn-on response (Trise), which hampers the antenna's reaction time and scanning capabilities.
Innovation Solution
The implementation of multiple variable phase shifters, each operating within a specific sub-band, allows for phase shifts to be controlled primarily through the Trise slope, minimizing reliance on the slower Tfall relaxation, thereby improving the overall response time of the antenna by ensuring faster beam scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single variable phase shifter is used for beam scanning, then the antenna can achieve phase shifting capability, but the response time is limited by the slow Tfall relaxation time
Solution Approach 1:
The phase shifter is divided into multiple independent variable phase shifters, each capable of providing a subset of the total required phase shift range. This segmentation allows the system to achieve the same overall phase shifting capability while enabling faster response times by selecting appropriate phase shifters based on the desired phase shift amount.
Solution Approach 2:
The system dynamically selects which variable phase shifters to activate based on the required phase shift amount. By controlling the switching timing and selection of phase shifters, the system can operate primarily on the fast Trise slope rather than waiting for the slow Tfall relaxation, thereby improving overall response time.
2Speed
If the antenna operates on Trise slope for phase shifting, then the response time is fast, but it requires multiple phase shifters and switching control
Solution Approach 1:
The total phase shift range is divided into multiple sub-ranges, with each variable phase shifter responsible for a specific sub-range. This segmentation enables the system to quickly switch between phase shifters rather than relying on slow relaxation, achieving fast phase shifting speeds.
Solution Approach 2:
Multiple variable phase shifters are pre-configured with different phase shift capabilities. The controller预先 determines which phase shifter should be activated based on the required phase shift, allowing the system to be ready to switch to the appropriate phase shifter before the beam scanning requires it, thus minimizing response time.
3Productivity
If multiple variable phase shifters are used with sub-band operation, then the overall response time is improved, but the device complexity increases
Solution Approach 1:
The phase shifters are organized into sub-groups where each group handles a specific sub-band of phase shift values. This structured segmentation allows for efficient management of multiple phase shifters and switches, improving beam scanning productivity while keeping the complexity manageable through systematic organization.
Solution Approach 2:
The switching mechanism serves multiple functions: it selects which phase shifter is active, controls the timing of phase shifter activation, and manages the transition between different phase shifters. This multi-functionality reduces the need for additional dedicated control components, improving productivity without proportionally increasing complexity.
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
This approach significantly reduces the antenna's response time by eliminating reliance on the slower Tfall, allowing for faster phase changes and minimizing communication interruptions during beam steering.
Implementation Method 1
when an appropriate electrical field is applied, the molecules rotate an amount that correlates with the strength of the applied field, and when the field is removed the molecules return to their relaxed state, thus changing the dielectric constant and affecting the transmission of an RF signal traveling in proximity to the molecules
Data Source
AI summary
An array antenna having radiating patches arranged in an array. Each of the radiating patches being connected to multiple variable phase shifters, wherein each phase shifter can produce a phase shift within a limited range. A switching arrangement is operable to connect different sets of variable phase shifters to the radiating patches to thereby scan the beam to desired directions.