Quiet Zone Expansion via Feed Antenna Phase Compensation
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Solution Overview
Problem
The challenge of testing wireless performance in compact antenna test ranges is exacerbated by the need for larger quiet zones for larger devices, which requires larger anechoic chambers and reflecting surfaces, increasing costs and complexity.
Innovation Solution
A method and system for expanding the quiet zone by moving and compensating the phase of the feed antenna within the existing chamber, using a phase compensation model to maintain testing accuracy without enlarging the reflecting surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the quiet zone size is increased to accommodate larger devices under test, then the testing capability for larger devices is improved, but the anechoic chamber volume and reflecting surface size must be increased, leading to increased costs and construction difficulty
Solution Approach 1:
The feed antenna is made movable along the optical axis of the parabolic reflector through a translation mechanism, allowing dynamic adjustment of the antenna position. This enables the quiet zone to be expanded or contracted by changing the distance between the feed antenna and the reflector, rather than requiring a fixed large chamber structure. The phase compensation mechanism dynamically adjusts the phase distribution to maintain testing accuracy at different positions.
Solution Approach 2:
The invention changes the phase distribution parameter of the feed antenna through phase compensation to maintain a planar phase distribution across the quiet zone when the antenna is displaced from the focal point. By adjusting the phase parameter dynamically, the system can expand the quiet zone coverage area without requiring proportional increases in chamber volume, effectively decoupling the quiet zone size from the chamber size.
2Area of stationary object
If the reflecting surface size is increased to expand the quiet zone, then the quiet zone coverage area is improved, but the device complexity and construction difficulty increase
Solution Approach 1:
Instead of using a larger static reflecting surface, the invention uses a movable feed antenna with phase compensation to dynamically expand the effective quiet zone coverage. The feed antenna translates along the optical axis and the phase is compensated to maintain testing accuracy, avoiding the need for larger and more complex reflector structures while achieving the same or better coverage area.
3Area of moving object
If the feed antenna is moved to expand the quiet zone, then the quiet zone coverage is improved, but the phase distribution becomes non-planar, degrading testing accuracy
Solution Approach 1:
The invention implements phase compensation that provides feedback control to maintain planar phase distribution. When the feed antenna is displaced from the focal point, the system calculates the required phase adjustment and applies compensation to restore the uniform phase distribution across the quiet zone, ensuring testing accuracy is maintained despite the antenna movement that expands the coverage area.
Solution Approach 2:
The phase distribution parameter of the feed antenna is dynamically adjusted through phase compensation to counteract the non-planar phase distribution that would normally result from displacing the antenna from the focal point. This parameter change maintains the planar phase distribution required for accurate testing while allowing the antenna to be positioned to expand the quiet zone coverage.
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 allows for efficient expansion of the quiet zone, reducing costs and maintaining testing accuracy for larger devices without increasing chamber size, thereby improving testing efficiency.
Implementation Method 1
a reflector, and a turntable; a device under test is placed on the turntable... the reflector has a reflecting surface, the feed antenna is arranged between the reflecting surface and the turntable
Implementation Method 2
input the first distance to a phase compensation model to obtain a compensation phase; compensate the original phase according to the compensation phase to obtain an adjusted phase
Data Source
AI summary
The present disclosure provides a wireless performance testing method and system based on quiet zone expansion in a compact antenna test range. The wireless performance testing method is implemented based on a wireless performance testing device and includes: to acquire an original phase of the feed antenna; rotate the turntable to obtain a first scattering parameter of the device under test; input the first distance to a phase compensation model to obtain a compensation phase; adjust the original phase of the feed antenna to the adjusted phase; rotate the turntable to obtain a second scattering parameter of the device under test; move the feed antenna along the first straight line repeatedly to different positions to obtain a plurality of the second scattering parameters. The wireless performance testing method can increase the size of the test quiet zone under the condition that the reflecting surface size is certain.