A Turnstile Quad-Ridge Orthomode Transducer (OMT) for Octave-Bandwidth Receiver Front-Ends (24-51 GHz)

We report on the design, fabrication, and measured results of a turnstile quad-ridge orthomode transducer (OMT) suitable for millimeter-wavelength receivers used in radio telescopes for astronomy. The quad-ridge OMT is directly compatible with a quad-ridge feed horn to implement dual-polarization lo...

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Vydáno v:IEEE transactions on microwave theory and techniques Ročník 71; číslo 11; s. 1 - 16
Hlavní autoři: Henke, Doug, Kelly, Neal, Marshall, Kyle, Wevers, Ivan, Knee, Lewis B. G.
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.11.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
<inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX"> Q</tex-math> </inline-formula>-band
Bandwidth
Bandwidths
Double-ridge waveguide
Dual polarization (waves)
Feeds
Insertion loss
octave bandwidth
orthomode transducer (OMT)
Polarization
Q-band
quad-ridge waveguide
quad-ridge waveguide turnstile junction
Radio astronomy
Radio telescopes
Receivers
Receivers & amplifiers
Rectangular waveguides
ridge waveguide
Transducers
Waveguide components
Waveguide junctions
wide bandwidth receivers
ISSN:0018-9480, 1557-9670, 1557-9670
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Popis
Shrnutí:We report on the design, fabrication, and measured results of a turnstile quad-ridge orthomode transducer (OMT) suitable for millimeter-wavelength receivers used in radio telescopes for astronomy. The quad-ridge OMT is directly compatible with a quad-ridge feed horn to implement dual-polarization low-noise receivers that exceed the single-mode bandwidth of a rectangular waveguide. Using a bandwidth of 24-51 GHz, the OMT demonstrated an insertion loss of 0.3-0.4 dB along with cross-polarization leakage and isolation below <inline-formula> <tex-math notation="LaTeX">-</tex-math> </inline-formula>40 dB. An OMT is a key part of a dual polarization receiver front-end, and our long-term goal is to realize low-noise, wideband receivers for radio astronomy utilizing ridge waveguides throughout the entire front-end. Design details are provided for each ridge waveguide feature within the OMT, including a quad-ridge waveguide turnstile junction, <inline-formula> <tex-math notation="LaTeX">E</tex-math> </inline-formula>-plane bend, and <inline-formula> <tex-math notation="LaTeX">E</tex-math> </inline-formula>-plane T-junction. To facilitate future layouts and integration, additional ridge waveguide component designs have been included for a 3-dB coupler, <inline-formula> <tex-math notation="LaTeX">H</tex-math> </inline-formula>-plane bend, and <inline-formula> <tex-math notation="LaTeX">H</tex-math> </inline-formula>-plane T-junction.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0018-9480
1557-9670
1557-9670
DOI:10.1109/TMTT.2023.3267544