A 385–500 GHz SIDEBAND-SEPARATING (2SB) SIS MIXER BASED ON A WAVEGUIDE SPLIT-BLOCK COUPLER

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

doi:10.1007/s10762-006-9052-4

Cited by 14 publications

(15 citation statements)

References 10 publications

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“…At submillimeter wavelengths mechanical tolerance becomes very severe. In this frequency band it has been indicated by M. Kamikura et al [6] that machining errors of ±5 μm do not affect the RF performance.…”

Section: Rf Quadrature Hybrid Design and Measurementmentioning

confidence: 82%

“…This is the most important component of the balanced mixer, because in this frequency range (400-500 GHz) the transmission loss at the waveguide is larger and it requires precise machining. Therefore we made a compact design based on [6], taking account of the ease of experiment at the same time.…”

Section: Rf Quadrature Hybrid Design and Measurementmentioning

confidence: 99%

“…On the other hand, the branch lines were fabricated with electrical discharge machining. The RF quadrature hybrid is split at the edge of the H-plane to reduce the loss due to the misalignment of the two split blocks [6]. Furthermore, taking account of the ease of experiment, we arranged the waveguide flange on the each lateral side of the cubic RF hybrid.…”

Section: Rf Quadrature Hybrid Design and Measurementmentioning

confidence: 99%

“…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%

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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: Rf Quadrature Hybrid Design and Measurementmentioning

confidence: 82%

Section: Rf Quadrature Hybrid Design and Measurementmentioning

confidence: 99%

Section: Rf Quadrature Hybrid Design and Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…The SIS tunneling junction mixers which down-converts the RF signal to the IF band of 4 to 8 GHz have been designed and developed by [22]. It employs sideband separating mixers with a waveguide quadrature hybrid [10], which scheme was a similar to 2 mm wavelength mixers [1]. The 4 K receiver optics adopts a single mirror to couple the feed horn in front of the mixer and the sub-reflector.…”

Section: Alma Band 8 Cartridge Qualification Modelmentioning

confidence: 99%

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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Development of the Measurement System of Image Rejection Ratio for the Sideband-Separating Receiver

Nakajima

Sakai

Kuno

et al. 2009

J Infrared Milli Terahz Waves

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We developed a measurement system of image rejection ratio for the sidebandseparating receiver. This system comprises a horn moved by a motor slider, a harmonic mixer and a signal generator. We have installed the system on the Nobeyama 45-m millimeter telescope and compared the image rejection ratio measured by this system with that obtained from molecular line observations of celestial objects. We confirmed that we can measure image rejection ratio with an accuracy of ±10% with our system. By using the system, we can tune the applied bias voltage of mixer chips to the best performance of image rejection ratio and accurate calibration of the intensity of molecular line observations becomes possible. This is the first IRR measurement system developed for practical use with the 2SB receiver system.

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A 385–500 GHz SIDEBAND-SEPARATING (2SB) SIS MIXER BASED ON A WAVEGUIDE SPLIT-BLOCK COUPLER

Cited by 14 publications

References 10 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 the Measurement System of Image Rejection Ratio for the Sideband-Separating Receiver

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