Microwave Lens OTA Testing for Multi-Panel Base Stations
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Solution Overview
Problem
Current over-the-air (OTA) testing of base stations is hindered by the inability to position test antennas far enough from the base station radio unit, leading to near-field conditions that result in erroneous and degraded test results due to beam management protocols assuming far-field conditions, causing interference and reduced efficacy.
Innovation Solution
A multi-panel base station test system utilizing a microwave lens or reflector to focus beams from antenna panels to a near-field focal point, allowing for accurate testing in smaller test chambers and improving test efficacy by simulating far-field conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If test antennas are positioned close to the base station radio unit to enable testing in compact environments, then the test chamber size is reduced, but near-field conditions cause erroneous and degraded test results
Solution Approach 1:
A microwave lens is introduced as an intermediary component between the antenna panels and test antennas. The lens focuses electromagnetic beams from multiple antenna panels to a common near-field focal point, enabling accurate testing at reduced distances. This mediator transforms the near-field environment into an effective far-field simulation, resolving the contradiction between compact chamber size and measurement accuracy.
Solution Approach 2:
The system changes the optical parameters of the testing environment by using a microwave lens with specific focal length properties. By adjusting the focal length parameter of the lens and positioning the test antennas at the focal point, the system creates a focused beam convergence that simulates far-field conditions despite physical proximity, thereby maintaining measurement accuracy in a compact space.
2Adaptability or versatility
If multiple antenna panels transmit beams in different spatial directions, then beam diversity and coverage are improved, but beam interference and management complexity increase
Solution Approach 1:
The microwave lens merges multiple beams transmitted from different antenna panels in different spatial directions into a single focused focal point. This combining effect allows simultaneous transmission of multiple beams without interference, as the lens optically directs all beams to converge at the test antenna location, simplifying beam management while maintaining spatial diversity.
Solution Approach 2:
The system adds an optical dimension to beam management by introducing the microwave lens as a focal control element. Instead of managing beam directions through complex electronic steering protocols, the lens provides a physical optical pathway that naturally focuses beams from multiple spatial dimensions to a single point, reducing protocol 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
The system enables effective OTA testing in compact environments, enhancing the accuracy and flexibility of base station performance evaluation, allowing for optimization and modification of base station radio units.
Implementation Method 1
A multi-panel base station test system utilizing a microwave lens or reflector to focus beams from antenna panels to a near-field focal point
Implementation Method 2
A multi-panel base station test system utilizing a microwave lens or reflector to focus beams from antenna panels to a near-field focal point
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
A multi-panel base station test system includes a base station radio unit configured with a plurality of antenna panels positioned at a first end of a test chamber of the multi-panel base station test system. The multi-panel base station test system includes a plurality of test antennas positioned at a second end of the test chamber opposing the first end. The multi-panel base station test system includes a microwave lens positioned between the plurality of antenna panels and the plurality of test antennas in the test chamber. The microwave lens is configured to focus respective beams transmitted from each of the plurality of antenna panels toward respective focal points associated with each of the plurality of test antennas based on steering of the plurality of antenna panels.