Anechoic Antenna Chamber Control for Accurate Receive Sensitivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antenna performance measurement methods in anechoic chambers suffer from inaccuracies in measuring receive sensitivity due to weak signal intensities and obstructions, leading to inconsistent and unreliable results.
Innovation Solution
An anechoic antenna chamber design with a control circuit that rotates the device under test (DUT) and controls multiple antennas to maintain specified signal intensities, ensuring accurate measurement of receive sensitivity by adjusting signal levels and angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the DUT is rotated to measure receive sensitivity at various angles, then measurement coverage is improved, but signal intensity becomes weak at specific angles leading to measurement inaccuracy
Solution Approach 1:
A signal amplification device is introduced as an intermediary component between the signal source and the DUT. This device amplifies the test signal specifically at angles where the received signal intensity is weak, ensuring that the DUT receives sufficient signal strength for accurate receive sensitivity measurements across all rotation angles.
Solution Approach 2:
The system dynamically changes the signal intensity parameter of the test signal based on the rotation angle of the DUT. When the DUT rotates to angles where signal reception is weak, the signal amplification device increases the signal intensity to maintain measurement accuracy throughout the full rotation range.
2Adaptability or versatility
If obstacles are disposed in the antenna chamber to simulate city center environment, then environmental realism is improved, but signal obstruction increases leading to measurement inconsistency
Solution Approach 1:
The signal amplification device acts as a compensatory intermediary that counteracts the signal weakening caused by obstacles. By amplifying the signal after it passes through the obstacle-laden environment, the system maintains measurement consistency while preserving the realistic urban environment simulation.
3Adaptability or versatility
If multiple test signals of different frequencies are used, then measurement comprehensiveness is improved, but signal interference increases making it difficult to distinguish individual signal measurements
Solution Approach 1:
The measurement process is segmented into sequential frequency measurements rather than simultaneous measurements. The signal amplification device and rotation system work together to measure receive sensitivity for each frequency band separately at different angular positions, eliminating interference between multiple frequencies while maintaining comprehensive multi-frequency measurement capability.
Data Source
AI summary
An anechoic antenna chamber includes: a holder on which a device under test (DUT) is configured to be mounted, at least one first antenna configured to radiate a first test signal of a first frequency band, a second antenna provided at an inner side of the antenna chamber and configured to radiate a second test signal of a second frequency, at least one driver configured to rotate the DUT, and a control circuit operatively connected with the at least one first antenna, the second antenna, and the at least one driving part. The control circuit is configured to control the driver to rotate the DUT and control the at least one first antenna to radiate the first test signal having an intensity of a specified range and control the second antenna to radiate the second test signal, while rotating the DUT.