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Cooled Ultra-Wideband Quadrature Directional Coupler

V. S. Chernikov, Ye. Yu. Khvostov, V. K. Chernov

Transactions of IAA RAS, issue 60, 44–48 (2022)

Keywords: directional coupler, broadband receiving system, circular polarization, cryo-cooled (cryo-coolable) to liquid hydrogen temperature

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Abstract

The purpose of this work is the development of an ultra-wideband 3–16 GHz quadrature directional coupler (hybrid) cryo-coolable up to 10 K. Such cooling ability allows to reduce active losses for use in very sensitive radio astronomic systems. Using the hybrid with a bi-linear polarization antenna enables to create signals with elliptical polarization with axial ratio less than 3 dB. The applied methods were the design of separate coupler parts based on reference data, electrodynamic analysis of the device and vector measurements of the fabricated model at 300 K and 10 K temperatures. The parameters of microwave components of the cryogenic unit were accounted. To eliminate negative effects of thermal compression a special casing shape was developed and sliding contact connections were developed. For tight adherence the coupler was provided with a bolthole system. A dielectric material was selected as a suitable stuff which had close values of thermal expansion directional coefficient comparable with the value of such characteristic for copper. The work provides the development of an ultra-wideband 3–16 GHz quadrature directional coupler (hybrid) cryo-coolable up to 10 K and measurement of the hybrid parameters at 300 K and 10 K temperatures. The topology of the device and thickness of the dielectric layers were derived from the electrodynamic model.

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V. S. Chernikov, Ye. Yu. Khvostov, V. K. Chernov. Cooled Ultra-Wideband Quadrature Directional Coupler // Transactions of IAA RAS. — 2022. — Issue 60. — P. 44–48.

@article{chernikov2022,
  abstract = {The purpose of this work is the development of an ultra-wideband 3–16 GHz quadrature directional coupler (hybrid) cryo-coolable up to 10 K. Such cooling ability allows to reduce active losses for use in very sensitive radio astronomic systems. Using the hybrid with a bi-linear polarization antenna enables to create signals with elliptical polarization with axial ratio less than 3 dB.
The applied methods were the design of separate coupler parts based on reference data, electrodynamic analysis of the device and vector measurements of the fabricated model at 300 K and 10 K temperatures. The parameters of microwave components of the cryogenic unit were accounted. To eliminate negative effects of thermal compression a special casing shape was developed and sliding contact connections were developed. For tight adherence the coupler was provided with a bolthole system. A dielectric material was selected as a suitable stuff which had close values of thermal expansion directional coefficient comparable with the value of such characteristic for copper.
The work provides the development of an ultra-wideband 3–16 GHz quadrature directional coupler (hybrid) cryo-coolable up to 10 K and measurement of the hybrid parameters at 300 K and 10 K temperatures. The topology of the device and thickness of the dielectric layers were derived from the electrodynamic model.},
  author = {V.~S. Chernikov and Ye.~Yu. Khvostov and V.~K. Chernov},
  doi = {10.32876/ApplAstron.60.44-48},
  issue = {60},
  journal = {Transactions of IAA RAS},
  keyword = {directional coupler, broadband receiving system, circular polarization, cryo-cooled (cryo-coolable) to liquid hydrogen temperature},
  pages = {44--48},
  title = {Cooled Ultra-Wideband Quadrature Directional Coupler},
  url = {http://iaaras.ru/en/library/paper/2104/},
  year = {2022}
}

TY  - JOUR
TI  - Cooled Ultra-Wideband Quadrature Directional Coupler
AU  - Chernikov, V. S.
AU  - Khvostov, Ye. Yu.
AU  - Chernov, V. K.
PY  - 2022
T2  - Transactions of IAA RAS
IS  - 60
SP  - 44
AB  - The purpose of this work is the development of an ultra-wideband 3–16
GHz quadrature directional coupler (hybrid) cryo-coolable up to 10 K.
Such cooling ability allows to reduce active losses for use in very
sensitive radio astronomic systems. Using the hybrid with a bi-linear
polarization antenna enables to create signals with elliptical
polarization with axial ratio less than 3 dB.  The applied methods
were the design of separate coupler parts based on reference data,
electrodynamic analysis of the device and vector measurements of the
fabricated model at 300 K and 10 K temperatures. The parameters of
microwave components of the cryogenic unit were accounted. To
eliminate negative effects of thermal compression a special casing
shape was developed and sliding contact connections were developed.
For tight adherence the coupler was provided with a bolthole system.
A dielectric material was selected as a suitable stuff which had
close values of thermal expansion directional coefficient comparable
with the value of such characteristic for copper.  The work provides
the development of an ultra-wideband 3–16 GHz quadrature directional
coupler (hybrid) cryo-coolable up to 10 K and measurement of the
hybrid parameters at 300 K and 10 K temperatures. The topology of the
device and thickness of the dielectric layers were derived from the
electrodynamic model.
DO  - 10.32876/ApplAstron.60.44-48
UR  - http://iaaras.ru/en/library/paper/2104/
ER  -