A 530-GHz balanced mixer

Chattopadhyay, Goutam; Rice, F.; Miller, David; Leduc, H. G.; Žmuidzinas, J.

doi:10.1109/75.808038

Cited by 19 publications

(9 citation statements)

References 7 publications

(7 reference statements)

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“…[2]), and the other is the 180 • hybrid type balanced mixer (eg. [3]). 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.…”

Section: Introductionmentioning

confidence: 93%

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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: Introductionmentioning

confidence: 93%

“…So far, several balanced mixers have been reported at submillimeter-wave bands, such as a 200-300 GHz coplanar waveguide type [2], and a 530 GHz quasioptical type [3,4]. These balanced mixers were integrated to contain all of the components in a block.…”

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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“…Wider IF bandwidths are possible through the use of a more sophisticated 180 hybrid design, perhaps integrated on-chip. It is also possible to use this device as a balanced mixer [14].…”

Section: Discussionmentioning

confidence: 99%

A dual-polarized quasi-optical SIS mixer at 550 GHz

Chattopadhyay

Miller²,

Leduc

et al. 2000

IEEE Trans. Microwave Theory Techn.

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Abstract-In this paper, we describe the design, fabrication, and the performance of a low-noise dual-polarized quasi-optical superconductor-insulator-superconductor (SIS) mixer at 550 GHz. The mixer utilizes a novel cross-slot antenna on a hyperhemispherical substrate lens, two junction tuning circuits, niobium trilayer junctions, and an IF circuit containing a lumped element 180 hybrid. The antenna consists of an orthogonal pair of twin-slot antennas, and has four feed points, two for each polarization. Each feed point is coupled to a two-junction SIS mixer. The 180 IF hybrid is implemented using a lumped element/microstrip circuit located inside the mixer block. Fourier transform spectrometer measurements of the mixer frequency response show good agreement with computer simulations. The measured co-polarized and cross-polarized patterns for both polarizations also agree with the theoretical predictions. The noise performance of the dual-polarized mixer is excellent, giving uncorrected receiver noise temperature of better than 115 K (double sideband) at 528 GHz for both the polarizations.

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“…Subsequent experimental and theoretical work [197]- [207] has shown that a 90% coupling efficiency may be achieved using optimized antennas and lenses. Dual-polarization designs are also possible [103], [208], [209]. Planar antenna calculations are typically carried out using rigorous moment-method techiques, and the effect of the lens is evaluated using ray-tracing and diffraction calculations, sometimes including multiple internal reflections.…”

Section: Design Approachesmentioning

confidence: 99%

“…Development goals include wide RF bandwidth with fixed-tuned operation, wide IF bandwidth, dual polarization, balanced mixers, sideband separation, and beam-lead contacts [19], [192]- [194], [208], [209], [241]- [251]. The ALMA memo series [252] is a particularly valuable source of technical information for this area, describing the latest progress being made by the numerous institutions involved in ALMA development.…”

Section: F New Directionsmentioning

confidence: 99%