- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Accurate Determination of Radiation Patterns from Near-Field Measurements in Highly Reflective Environments
摘要： The radiation pattern of an antenna under test is determined from measurements in a highly reflective, fully metallic measurement environment similar to a reverberation chamber. The undesired influence of the reflecting walls is eliminated by processing the data obtained for a large number of frequencies and different probe locations in the chamber. The post-processing concept effectively combines temporal and spatial filtering of the measured signals in an innovative field synthesis concept. S-Band measurements show the effectiveness of the proposed processing concepts. The accuracy is comparable to anechoic measurements, however, for the cost of increased measurement and post-processing effort.
关键词： echo suppression,near-field far-field transformation,antenna measurement
更新于2025-09-23 15:23:52
-
Equivalent source and pattern reconstruction from oversampled measurements in highly-reflective environments
摘要： Measurement errors due to echoes are a major challenge for accurate antenna pattern measurements. In particular in highly-reflective measurement environments, the echo contribution can easily have more influence on the measurement signal than the desired line-of-sight contribution between the antenna under test and the measurement probe. A large number of redundant measurement samples at different locations and for different frequencies is used together with appropriate post-processing techniques to mitigate the echo influences on the measurements. The frequency diversity is used for time gating. A virtual array, less sensitive to the undesired echo fields, is formed using probe diversity. In this work, the common time gating technique is enhanced and the impact of different probe configurations for creating a virtual array is investigated. The utilised time gating method extends the measured frequency domain signal to mitigate the Gibbs phenomenon. Processing measurements in a quasi-metallic room, the signal contributions at the edges of the measured bandwidth do not suffer from distortions with the enhanced time gating method. Combining up to 115 probes to form a virtual array, it is found that the results improve with an increasing number of probes as long as the probes are distant enough from the walls.
关键词： time gating,echo suppression,highly-reflective environments,antenna pattern measurements,virtual array
更新于2025-09-11 14:15:04