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Development of a X-Band, Crosspolarization Compensating Feed Antenna for the Compact Test Range

Pircher, Michael (2022) Development of a X-Band, Crosspolarization Compensating Feed Antenna for the Compact Test Range. Master's, Technische Universität München (TUM).

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In antenna measurements it is well known that single reflector and dual cylindrical reflector Compact Antenna Test Ranges (CATRs) suffer from a high cross-polarization level in the Quiet Zone (QZ). This limits their performance of measuring an Antenna under Test (AUT) with high cross-polar suppression. This issue is avoided by the development of a new three element feed array. The central horn antenna ensures the co-polar field, while the outer horns generate the so called conjugate matched field and hence reduce the cross-polarization. A nonlinear, numerical optimization is used to calculate the weighting factors of each element. It must consider also the limitations of the prototype-based feeding network. The feed array is capable of generating horizontally and vertically polarized waves and it operates in the X-band. The performance of the feed array is validated in High-Frequency Structure Simulator (HFSS) simulations, where an improvement of 8 dB in the cross-polar level is found in the QZ. A proof of concept demonstrator is measured in the Compact Test Range (CTR) of the Microwaves and Radar Institute of the German Aeorspace Center (DLR). A field probe scan shows a mean cross-polar level of −41.6 dB, over 9 dB better than the currently used reference. The cross-polarization is effectively reduced over a bandwidth of 900 MHz.

Item URL in elib:https://elib.dlr.de/145874/
Document Type:Thesis (Master's)
Title:Development of a X-Band, Crosspolarization Compensating Feed Antenna for the Compact Test Range
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:March 2022
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Number of Pages:56
Keywords:CTR, cross-polarization, conjugate matched field
Institution:Technische Universität München (TUM)
Department:Fakultät für Elektrotechnik, Lehrstuhl für Hochfrequenztechnik
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - SAR Expert Support Lab
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > SAR Technology
Deposited By: Pircher, Michael
Deposited On:30 Nov 2021 09:17
Last Modified:07 Oct 2022 16:42

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