High-performance cryogenic fractal 180° hybrid power divider with integrated directional coupler

Journal
Date Issued
2017
Author(s)
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Mazzarella, Giuseppe
DOI
Abstract
A 180° hybrid and a directional coupler to be employed in the P-band cryogenic receiver of the Sardinia Radio Telescope are proposed in this work. An in-depth study of the issues related to the use of microwave components for cryogenic radio astronomy receivers is carried out to select the best suited technology and configuration. As a result, a planar fractal 180° hybrid configuration available in the literature has been optimized aiming to increase the operating bandwidth in order to comply with the design specifications of the application at hand. A coupled line directional coupler with weak coupling and high isolation, used to calibrate the receiver chain, is cascaded to the 180° hybrid and realized in the same layout. The final device, consisting of the 180° hybrid and the directional coupler, has been manufactured and tested at the cryogenic temperature of 20 K, showing a good agreement between experimental results and predicted performance.
Volume
52
Issue
6
Start page
757
Uri
Url
Issn Identifier
0048-6604
Ads BibCode
2017RaSc...52..757L
Rights
open.access
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