Gregson, S F; Tian, Z (2018) Comparison of Spherical and Cylindrical Mode Filtering Techniques for Reflection Suppression With mm-wave Antenna Measurements. In: 2018 IEEE Conference on Antenna Measurement & Applications (CAMA), 3-6 September 2018, Vasterarings, Sweden.

Full text not available from this repository.

Abstract

Reflections in antenna measurement ranges generally comprise the most significant component within the facility level uncertainty budget [1]. For more than a decade, a frequency domain measurement and mode filtering technique has been employed to significantly reduce range reflections within spherical near-field antenna test systems [2, 3]. More recently, this technique was adapted so that it could also be used with far-field antenna measurement systems [4, 5] and was firmly rooted in standard cylindrical near-field theory [6, 7, 8]. Although initially conceived as a means by which the frequency of operation of a given facility could be extended downwards to, e.g. UHF, where operation could otherwise be compromised by the limited performance of the absorber, these techniques have been used very successfully at frequencies much higher than this. However, this paper, for the first time, compares and contrasts the effectiveness of the approach at EHF frequencies and in particular at 190 GHz. This paper provides an introduction to the measurement techniques and offers a description of the mode filtering and post-processing algorithms before presenting preliminary results of actual range measurements and transformation using both spherical and cylindrical mode filtering of a mm-wave low gain horn antenna. These results illustrate the success of the techniques and examine the effect of various band-pass filter functions.

Item Type:	Conference or Workshop Item (Paper)
Keywords:	Antenna measurement, spherical near-filed, cylindrical near-field
Subjects:	Electromagnetics > Wireless Communications
Divisions:	Engineering, Materials & Electrical Science
Identification number/DOI:	10.1109/CAMA.2018.8530460
Last Modified:	22 Jan 2019 13:53
URI:	https://eprintspublications.npl.co.uk/id/eprint/8242