A method of pattern measurement to cancel reflection waves in anechoic chamber

Improvement of antenna measurement results at low frequencies by using post-processing techniques

“…Other solutions within the category of so-called compensation methods can be applied to avoid measuring the antenna under test several times at different distances with respect to the probe. Test zone field compensation [8] is one of these methods, and it is used to reduce the effects of undesired fields created by reflections, employing only the data from one measurement performed over a spherical surface. The main drawback of this last technique is the computational complexity, which can be reduced as shown in [9], in which the unwanted reflected components are associated with plane waves with which the error patterns are estimated.…”

Overview of Novel Post-Processing Techniques to Reduce Uncertainty in Antenna Measurements

“…There are methods that are employed not to remove the reflection waves, but rather to characterize the chambers by a figure of merit, usually called the reflectivity level, in frequency domain (Appel-Hansen, 1973) or time domain (Clouston, 1988). Another method, based on measurements at several distances, was presented (Nagatoshi, 2008). Other solutions within the category of so-called compensation methods can be applied to avoid measuring the AUT several times at different distances with respect to the probe (Black, 1995) and .…”

Analysis of time filtering techniques for echo reduction in antenna measurements

“…The number of approaches to analyze and cancel the effects of unwanted contributions has increased in recent years. Methods such as time domain characterization, frequency decomposition, and compensation techniques have been employed and studied [1][2][3][4][5][6][7][8]. Other techniques consist in spatial filtering or diagnostic techniques [9][10][11][12][13][14][15][16][17][18].…”