Simons Observatory: characterizing the Large Aperture Telescope
				Receiver with radio holography

Chesmore, Grace E.; Harrington, Kathleen; Sierra, Carlos; Gallardo, Patricio A.; Sutariya, Shreya; Alford, Thomas; Adler, Alexandre; Bhandarkar, Tanay; Coppi, Gabriele; Dachlythra, Konstantina; Golec, Joseph E.; Gudmundsson, J. E.; Haridas, Saianeesh K.; Johnson, Bradley R.; Kofman, Anna M.; Iuliano, Jeffrey; McMahon, Jeff; Niemack, Michael D.; Orlowski-Scherer, Jack L.; Sarmiento, Karen Perez; Puddu, Roberto; Silva-Feaver, Max; Simon, Sara M.; Robe, Julia; Wollack, Edward J.; Xu, Zhilei

doi:10.1364/ao.470138

Cited by 9 publications

(1 citation statement)

References 35 publications

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“…Because the phase information cannot be directly measured by bolometric detectors, several near-field measurements of CMB telescopes using a phase-sensitive receiver that replaces a few representative pixels of the focal-plane detector array have been reported. 14,15 Because the far-field antenna patterns depend not only on the antenna optics but also on the feed-coupling to the detectors, we study a near-field measurement method using the bolometric detector array as it is by retrieving the phase of the AUT aperture field through another technique. For millimeter-wave transmitting antennas, several phase-retrieval techniques have been proposed; these can be classified into two categories: a technique that uses intensity information on two surfaces 16,17 and a holographic phase-retrieval technique.…”

Section: Introductionmentioning

confidence: 99%

Holographic phase-retrieval method of near-field antenna pattern measurement for bolometer-array-equipped millimeter-wave telescopes

Nakano

Takakura

Sekímoto

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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Wide field-of-view millimeter-wave telescopes with a bolometric detector array have been developed for cosmic microwave background radiation observations. For the purpose of laboratory verification of these telescopes, several studies have demonstrated near-field antenna measurements using a phase-sensitive detector that replaces a few representative pixels of the focal-plane detector array. We present a holographic phase-retrieval method that enables nearfield measurements with the bolometric detector array as it is. We place a reference emitter at a fixed position and scan a signal emitter at the telescope aperture. These two emitters are phaselocked and generate interference patterns (holograms) on the focal plane, from which the amplitude and phase of the aperture field can be retrieved. We experimentally demonstrated this method with a crossed-Dragone telescope with a field-of-view that is 18 deg × 9 deg. In the demonstration, we placed a phase-sensitive detector at three detector positions on the focal plane. The antenna patterns calculated from the hologram, neglecting the directly measured phase information, were consistent with those calculated from both intensity and phase measurements at the −60-dB level at 180 GHz. Applying this method, the antenna patterns for all of the bolometric detectors on the focal plane can theoretically be measured simultaneously.

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Section: Introductionmentioning

confidence: 99%

Holographic phase-retrieval method of near-field antenna pattern measurement for bolometer-array-equipped millimeter-wave telescopes

Nakano

Takakura

Sekímoto

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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Design of Broadband Phased Array Feed Using Stereolithographic Additive Manufacturing Heterogeneous Integrating Technology for Fast Radio Burst Observation

Wang,

Liu,

et al. 2024

Adv Eng Mater

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Herein, a stereolithography appearance 3‐D printed phased array feed (PAF) on radio telescopes based on broadband Vivaldi antenna elements covering 4–10 GHz, which meets the requirements of low cost, lightweight, and compact volume, is designed and proposed. The prototype is integrated with two orthogonal linear polarized 4 × 5 arrays, each of which is composed of 20 Vivaldi antenna elements. The distance between adjacent antenna elements is 1/2 λ in both E‐plane and H‐plane. By increasing thickness of the slice elements compared with traditional end‐fire arrays on printed circuit board, the wide‐band impedance matching is realized. The mutual impedance matrix of the dual‐polarization array is calculated and the equivalent circuit of the active and parasitic elements is demonstrated. Due to the orthogonal parasitic elements inserted between the adjacent active antennas, equivalent capacitance is introduced in the tightly coupled array. The measured active voltage standing wave ratio of the manufactured PAF exhibits 4–10 GHz operating bandwidth for both broadside radiation and 45° scan in both E‐ and H‐plane polarization. The proposed wideband PAF has a promising potential application prospect in fast radio burst and other astronomic observation.

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Discrete form of the Huygens-Fresnel principle: to the multi-dimensional analog of the Nyquist–Shannon sampling theorem

Vitulyova,

Suleimenov,

Matrassulova

et al. 2023

Int. j. inf. tecnol.

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Simons Observatory: characterizing the Large Aperture Telescope Receiver with radio holography

Cited by 9 publications

References 35 publications

Holographic phase-retrieval method of near-field antenna pattern measurement for bolometer-array-equipped millimeter-wave telescopes

Holographic phase-retrieval method of near-field antenna pattern measurement for bolometer-array-equipped millimeter-wave telescopes

Design of Broadband Phased Array Feed Using Stereolithographic Additive Manufacturing Heterogeneous Integrating Technology for Fast Radio Burst Observation

Discrete form of the Huygens-Fresnel principle: to the multi-dimensional analog of the Nyquist–Shannon sampling theorem

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