A Submillimeter Cartridge-Type Receiver: ALMA Band 8 (385--500 GHz) Qualification Model

Satou, Naohisa; Sekímoto, Yutaro; Iizuka, Yoshizo; Ito, Tetsuya; Shan, Wenlei; Kamba, Toshiaki; Kumagai, Kazuyoshi; Kamikura, Mamoru; Tomimura, Yu; Serizawa, Yasutaka; Asayama, Shin’ichiro; Sugimoto, Masahiro

doi:10.1093/pasj/60.5.1199

Cited by 32 publications

(18 citation statements)

References 15 publications

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“…The quadrature hybrid type balanced mixer contains a quadrature hybrid as an RF-hybrid, while on the other hand the 180 • hybrid type balanced mixer includes a 180 • hybrid as an RF-hybrid. In the present work, we developed the quadrature hybrid type balanced mixer with waveguide technology because a quadrature hybrid with good performance has already been developed by M. Kamikura et al [6] and demonstrated as a sideband separating mixer [7].…”

Section: Introductionmentioning

confidence: 99%

A 400–500 GHz Balanced SIS Mixer with a Waveguide Quadrature Hybrid Coupler

Serizawa

Sekímoto

Kamikura

et al. 2008

Int J Infrared Milli Waves

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We have developed a 400-500 GHz low-noise balanced SIS (Superconductor Insulator Superconductor) mixer, which is based on a waveguide RF quadrature hybrid coupler. The RF quadrature hybrid was designed and fabricated as a broadband hybrid with good performance at 4 K. The fabricated RF quadrature hybrid was measured at room temperature with a submillimeter vector network analyzer to check amplitude and phase imbalance between two output ports. Then the balanced mixer was assembled with the RF hybrid, two DSB mixers, and a 180 • IF hybrid. Several important parameters such as noise temperature, LO power reduction, and IF spectra were measured. The LO power reduction is defined as how much LO power the balanced mixer saves compared with a typical single-ended mixer. The measured noise temperature of the balanced mixer was ∼ 55 K at the band center which corresponds to ∼ 3 times the quantum noise limit (hf/k) in DSB, and ∼ 120 K at the band edges. The noise performance over LO frequency was almost the same as that of the worse DSB mixer used in the balanced mixer. In addition the LO power required for the balanced mixer is ∼ 11 dB less than that of the single-ended mixers.

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Section: Introductionmentioning

confidence: 99%

A 400–500 GHz Balanced SIS Mixer with a Waveguide Quadrature Hybrid Coupler

Serizawa

Sekímoto

Kamikura

et al. 2008

Int J Infrared Milli Waves

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“…We have developed a qualification model (QM) of the ALMA band 8 cartridge [20]. The ALMA band 8 QM receiver [12] is a dual polarization receiver, which uses a wire grid as a polarization splitter.…”

Section: Alma Band 8 Cartridge Qualification Modelmentioning

confidence: 99%

“…The receiver optics is tilted 1.2 degrees toward the sub-reflector. The optics block was carefully designed to realize the optical parameters at 4 K [20]. The shrinkage of all components from 300 K to 4 K was taken into consideration.…”

Section: Alma Band 8 Cartridge Qualification Modelmentioning

confidence: 99%

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Near-field beam pattern measurement of qualification model of ALMA band 8 (385–500 GHz) cartridge receiver

et al. 2009

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We have developed a near-field vector beam measurement system covering the range of frequencies from 385 to 500 GHz. The measurement set-up is capable of measurements with dynamic range exceeding 50 dB and amplitude and phase stability respectively of 0.1 dB/h and 1 degree/5 min at room temperature. Beam patterns of the ALMA band 8 corrugated horns and receiver optics block were measured at room temperature and lately compared with physical optics calculations obtained in the far-field. Both copolar and cross-polar beam patterns of a qualification model of the ALMA band 8 cartridge cooled in a cartridge-test-cryostat have also been measured in the near-field as a detector of a submillimeter vector network analyzer. The measurements presented in this work refer to the lowest, middle and upper frequencies of band 8. The comparisons between software model and experimental measurements at these frequencies show good agreement down to −30 dB for the main polarization component. The cross-polarization level of the beam propagating through the receiver optics block was also characterized. We found that a cross-polarization level better than −28 dB can be achieved at all measured frequencies. The measured beam pattern of this receiver corresponds to efficiency of greater than 92% at the sub reflector (diameter of 750 mm) of the ALMA 12 m optics.

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“…To meet the ALMA specification, the following requirements were set for an ALMA Band 8 (385-500 GHz) OMT from a prototype study of the performance of a receiver [19] with a 2SB mixer [20].…”

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confidence: 99%

Development of a Submillimeter Double-Ridged Waveguide Ortho-Mode Transducer (OMT) for the 385–500 GHz Band

Kamikura

Naruse

Asayama

et al. 2010

J Infrared Milli Terahz Waves

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We present design and evaluations of a submillimeter double-ridged waveguide ortho-mode transducer (OMT) for ALMA Band 8 (385-500 GHz) cartridge receiver. The measured transmission loss of the OMT at 4 K was 0.4-0.5 dB according to noise measurements with an SIS mixer. The polarization isolation was measured to be larger than 29 dB from quasioptical measurements. The OMT consists of a Bfifot junction and a double-ridged guide. A robust design with allowable mechanical errors of 20 μm has been demonstrated.

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A Submillimeter Cartridge-Type Receiver: ALMA Band 8 (385--500 GHz) Qualification Model

Cited by 32 publications

References 15 publications

A 400–500 GHz Balanced SIS Mixer with a Waveguide Quadrature Hybrid Coupler

A 400–500 GHz Balanced SIS Mixer with a Waveguide Quadrature Hybrid Coupler

Near-field beam pattern measurement of qualification model of ALMA band 8 (385–500 GHz) cartridge receiver

Development of a Submillimeter Double-Ridged Waveguide Ortho-Mode Transducer (OMT) for the 385–500 GHz Band

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