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Antenna Phase Center Determination Using a Six-Port-Based Direction-of-Arrival Detector
Publikationstyp
Journal Article
Date Issued
2023-05-01
Sprache
English
Author(s)
Institut
Volume
71
Issue
5
Start Page
4007
End Page
4016
Citation
IEEE Transactions on Antennas and Propagation 71 (5): 4007-4016 (2023-05-01)
Publisher DOI
Scopus ID
This article presents a novel technique to determine the antenna phase center. It relies on measuring the direction of arrival of the radiated field. Therefore, no access of the measurement equipment to the antenna under test is required. A direction-of-arrival detector is implemented that performs phase difference measurements in two orthogonal planes. Six-port interferometers are used for this purpose. By considering phase differences, the proposed method is robust against phase disturbances, which may occur at the feed of the antenna under test, e.g., due to flexible cables or rotary joints. Besides, impairments stemming from reflections in the measurement environment are addressed. Measurements of a K-band horn and a patch antenna in an anechoic chamber validate the approach. A single phase center is determined for each principle plane as well as for the three-dimensional main beam. In addition, the phase center locus is retrieved.
Subjects
Anechoic chamber
angle of arrival
antenna phase center
direction of arrival
horn antenna
multipath interference
patch antenna
six-port