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Dual-band Cooled Feed for a Radio Telescope

Transactions of IAA RAS, issue 21, 69–74 (2010)

Keywords: радиоинтерферометрия со сверхдлинными базами, двухдиапазонный облучатель радиотелескопа, квадратурный воздушно-полосковый мост, криостат с радиопрозрачным окном, осесимметричная параболическая антенна

Abstract

Design of the S/X band feed with circular polarization is considered. The design is allowing of increasing number of frequency channels, according to requirements of a method of a broadband delay. The feed represents coaxial system of ring radiators of S and X bands. For decrease of noise temperature of the device, the feed is placed in a dewar with a radio transparent window, where it is cooled to temperatures of hydrogen level. According to mathematical modeling, X-band channel of the feed has following characteristics in a range from 8500 to 9000 MHz: — VSWR is less than 1.6; — Sum of return and isolation losses is less than 18 %; — Axial ratio is less than 3 dB; — Beamwidth on the level of minus 10 dB is (120-130)0; — Sidelobes and backlobe levels are less than minus 18 dB.

Citation

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A. Ipatov, V. Chernov. Dual-band Cooled Feed for a Radio Telescope // Transactions of IAA RAS. — 2010. — Issue 21. — P. 69–74.

@article{ipatov2010,
  abstract = {Design of the S/X band feed with circular polarization is considered. The design is allowing of increasing number of frequency channels, according to requirements of a method of a broadband delay. The feed represents coaxial system of ring radiators of S and X bands. For decrease of noise temperature of the device, the feed is placed in a dewar with a radio transparent window, where it is cooled to temperatures of hydrogen level.

According to mathematical modeling, X-band channel of the feed has following characteristics in a range from 8500 to 9000 MHz:

—	VSWR is less than 1.6; 
—	Sum of return and isolation losses is less than 18 %; 
—	Axial ratio is less than 3 dB; 
—	Beamwidth on the level of minus 10 dB is (120-130)0; 
—	Sidelobes and backlobe levels are less than minus 18 dB.},
  author = {A. Ipatov and V. Chernov},
  issue = {21},
  journal = {Transactions of IAA RAS},
  keyword = {радиоинтерферометрия со сверхдлинными базами, двухдиапазонный облучатель радиотелескопа, квадратурный воздушно-полосковый мост, криостат с радиопрозрачным окном, осесимметричная параболическая антенна},
  pages = {69--74},
  title = {Dual-band Cooled Feed for a Radio Telescope},
  url = {http://iaaras.ru/en/library/paper/699/},
  year = {2010}
}

TY  - JOUR
TI  - Dual-band Cooled Feed for a Radio Telescope
AU  - Ipatov, A.
AU  - Chernov, V.
PY  - 2010
T2  - Transactions of IAA RAS
IS  - 21
SP  - 69
AB  - Design of the S/X band feed with circular polarization is considered.
The design is allowing of increasing number of frequency channels,
according to requirements of a method of a broadband delay. The feed
represents coaxial system of ring radiators of S and X bands. For
decrease of noise temperature of the device, the feed is placed in a
dewar with a radio transparent window, where it is cooled to
temperatures of hydrogen level.    According to mathematical
modeling, X-band channel of the feed has following characteristics in
a range from 8500 to 9000 MHz:    —       VSWR is less than 1.6;   —
Sum of return and isolation losses is less than 18 %;   —       Axial
ratio is less than 3 dB;   —       Beamwidth on the level of minus 10
dB is (120-130)0;   —       Sidelobes and backlobe levels are less
than minus 18 dB.
UR  - http://iaaras.ru/en/library/paper/699/
ER  -