A planar dipole array antenna with an elliptical lens

Supercond. Sci. Technol.

2000

215

170

The concept of a fully superconducting integrated receiver is developed and experimentally tested. This single-chip sub-mm wave receiver includes a planar antenna integrated with a SIS mixer and an internal superconducting Josephson-type local oscillator (flux-flow oscillator, FFO). The receiver is tested with a DSB noise temperature below 100 K around 500 GHz being pumped by its internal local oscillator (LO). The instantaneous bandwidth of 15-20% is estimated via FTS and heterodyne measurements that meet the requirements of most practical applications. The far field antenna beam is measured as ≈f/10 with sidelobes below −16 dB that is suitable for coupling to a real telescope antenna. A nine-pixel imaging array receiver with each pixel containing an internally pumped receiver chip is developed and tested. A linewidth of the phase locked FFO as low as 1 Hz is measured relative to a reference oscillator in the frequency range 270-440 GHz. An rf amplifier on the base of a dc SQUID is developed and tested showing a noise figure below 10 K at 4 GHz and a bandwidth of about 300 MHz. This amplifier can be included as a part of an integrated receiver that is valuable for array applications.

Section: Balanced Sis Mixermentioning

confidence: 99%

Integrated superconducting receivers

Koshelets

Supercond. Sci. Technol.

2000

215

170

“…1, and mounted at the flat back of the silicon elliptical lens with antireflection coating [13]. Being combined with the focusing lens, the double dipole antenna SIS mixer [2], [13] provides the beam of about 10 degrees wide pointed to the sample source (2) which can also be equipped with its own lens. An additional focusing lens (3) and/or an infrared filter can be mounted at the adjustable aperture ring of the receiving head.…”

Section: A Design Of the Probe Receivermentioning

confidence: 99%

“…To enable such a test for oscillators working at different temperatures, the non-contacting (quasioptical) scheme is the most natural choice. A SIS mixer with integrated planar antenna can be a good solution for the front-end of the test receiver [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Superconducting integrated receiver as 400-600 GHz tester for coolable devices

IEEE Trans. Appl. Supercond.

Levitchev

Veretennikov

et al. 2001

Laboratory-purpose submillimeter wavelength receiver is developed and tested. The device can in situ detect spectrum of an rf source working below 100 K within frequency range of 400-600 GHz. A sample is placed close to the receiver sensor; both are in vacuum inside the probe stick cooled by liquid helium in the standard transport dewar. The quasi-optical sensor is designed on a base of the superconducting integrated receiver chip; its noise temperature below 300K was measured with a variable-temperature black body at 520 GHz. The output level of the tester is suitable for the direct readout by a spectrum analyzer. Details of design and main test data are reported. Index Terms-Double-dipole antenna, flux-flow oscillator,Josephson oscillator, lens-antenna, microwave lens, planar antenna, quasi-optical mixer, quasi-optical receiver, SIS mixer, SIS receiver, spectral measurements, submillimeter receiver, superconducting integrated circuit.

“…The double-slot and the double-dipole are two types of antennas widely used in SIS mixers [10], [15]- [18]. Both antennas have, theoretically, similar parameters of the beam if used as an integrated lens-antenna; they have also similar values of the feed-point impedance.…”

Section: Introductionmentioning

confidence: 99%

A low-noise double-dipole antenna SIS mixer at 1 THz

Physica C: Superconductivity

Jackson

Baryshev

et al. 2002

A quasi-optical mixer employing a Nb/Al/AlO x /Nb twin-SIS junction with a NbTiN/SiO 2 /Al microstrip coupling circuit is tested at 800-1000 GHz. The mixer design is developed as an option for HIFI frequency bands 3 and 4. The double-dipole antenna is made from NbTiN/Al; a Nb film is used for the back reflector. The mixer design is optimized for the IF band of 4-8 GHz. The receiver noise temperature T RX = 250 K (DSB) is measured at 935 GHz for the bath temperature 2 K at IF=1.5 GHz; T RX remains below 350 K within the frequency range 850-1000 GHz. The double-dipole antenna beam pattern demonstrated good symmetry with sidelobes below -16 dB. IntroductionLow-noise THz-band heterodyne receivers are needed to realize the full potential of airborne and space-based telescopes currently being developed for sub-millimeter spectral astronomy, e. g. for HIFI [1]. To consider the possibility of designing an effective SIS mixer at 1 THz, it is worth to have a brief look at the most critical parameters of SIS mixers.