Quasi-Optical SIS Mixers with Nb/AIO<I><SUB>x</SUB></I>/Nb Tunnel Junctions in the 270-GHz Band

Yoshinori UZAWA; Akira KAWAKAMI; Zhen WANG; Takashi NOGUCHI

Quasi-Optical SIS Mixers with Nb/AIO_x/Nb Tunnel Junctions in the 270-GHz Band

Yoshinori UZAWA, Akira KAWAKAMI, Zhen WANG, Takashi NOGUCHI

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A quasi-optical Superconductor-Insulator-Superconductor (SIS) mixer has been designed and tested in the 270-GHz band. The mixer used a substrate-lens-coupled log-periodic antenna and a tuning circuit for RF matching. The antenna is planar and self-complementary, and has a frequency-independent impedance of around 114 Ω over several octaves. The tuning circuit consists of two Nb/AIO_x/Nb tunnel junctions separated by inductance for tuning out the junction capacitances and a λ/4 impedance transformer for matching the resistance of the two-junction circuit to the antenna impedance. The IF output from the mixer is brought out in a balanced method at each edge of the antenna, and is coupled to a low noise amplifier through a balun transformer using a 180-degree hybrid coupler for broadband IF matching. Double sideband receiver noise temperatures, determined from experimental Y-factor measurements, are about 150 K across the majority of the desired operating frequency band. The minimum receiver noise temperature of 120 K was measured at 263 GHz, which is as low as that of waveguide receivers. At this frequency, measurement of the noise contribution to the receiver results in input losses of 90 K, mixer noise of 17 K, and multiplied IF noise of 13 K. We found that the major sources of noise in our quasi-optical receiver were the optical losses.

Publication: IEICE TRANSACTIONS on Electronics Vol.E79-C No.9 pp.1237-1241

Publication Date: 1996/09/25

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Type of Manuscript: Special Section PAPER (Special Issue on Toward Digital and Analog Applications of Superconductors)

Category: Analog applications

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Yoshinori UZAWA, Akira KAWAKAMI, Zhen WANG, Takashi NOGUCHI, "Quasi-Optical SIS Mixers with Nb/AIOx/Nb Tunnel Junctions in the 270-GHz Band" in IEICE TRANSACTIONS on Electronics, vol. E79-C, no. 9, pp. 1237-1241, September 1996, doi: .
Abstract: A quasi-optical Superconductor-Insulator-Superconductor (SIS) mixer has been designed and tested in the 270-GHz band. The mixer used a substrate-lens-coupled log-periodic antenna and a tuning circuit for RF matching. The antenna is planar and self-complementary, and has a frequency-independent impedance of around 114 Ω over several octaves. The tuning circuit consists of two Nb/AIO_x/Nb tunnel junctions separated by inductance for tuning out the junction capacitances and a λ/4 impedance transformer for matching the resistance of the two-junction circuit to the antenna impedance. The IF output from the mixer is brought out in a balanced method at each edge of the antenna, and is coupled to a low noise amplifier through a balun transformer using a 180-degree hybrid coupler for broadband IF matching. Double sideband receiver noise temperatures, determined from experimental Y-factor measurements, are about 150 K across the majority of the desired operating frequency band. The minimum receiver noise temperature of 120 K was measured at 263 GHz, which is as low as that of waveguide receivers. At this frequency, measurement of the noise contribution to the receiver results in input losses of 90 K, mixer noise of 17 K, and multiplied IF noise of 13 K. We found that the major sources of noise in our quasi-optical receiver were the optical losses.
URL: https://globals.ieice.org/en_transactions/electronics/10.1587/e79-c_9_1237/_p

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@ARTICLE{e79-c_9_1237,
author={Yoshinori UZAWA, Akira KAWAKAMI, Zhen WANG, Takashi NOGUCHI, },
journal={IEICE TRANSACTIONS on Electronics},
title={Quasi-Optical SIS Mixers with Nb/AIOx/Nb Tunnel Junctions in the 270-GHz Band},
year={1996},
volume={E79-C},
number={9},
pages={1237-1241},
abstract={A quasi-optical Superconductor-Insulator-Superconductor (SIS) mixer has been designed and tested in the 270-GHz band. The mixer used a substrate-lens-coupled log-periodic antenna and a tuning circuit for RF matching. The antenna is planar and self-complementary, and has a frequency-independent impedance of around 114 Ω over several octaves. The tuning circuit consists of two Nb/AIO_x/Nb tunnel junctions separated by inductance for tuning out the junction capacitances and a λ/4 impedance transformer for matching the resistance of the two-junction circuit to the antenna impedance. The IF output from the mixer is brought out in a balanced method at each edge of the antenna, and is coupled to a low noise amplifier through a balun transformer using a 180-degree hybrid coupler for broadband IF matching. Double sideband receiver noise temperatures, determined from experimental Y-factor measurements, are about 150 K across the majority of the desired operating frequency band. The minimum receiver noise temperature of 120 K was measured at 263 GHz, which is as low as that of waveguide receivers. At this frequency, measurement of the noise contribution to the receiver results in input losses of 90 K, mixer noise of 17 K, and multiplied IF noise of 13 K. We found that the major sources of noise in our quasi-optical receiver were the optical losses.},
keywords={},
doi={},
ISSN={},
month={September},}

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TY - JOUR
TI - Quasi-Optical SIS Mixers with Nb/AIOx/Nb Tunnel Junctions in the 270-GHz Band
T2 - IEICE TRANSACTIONS on Electronics
SP - 1237
EP - 1241
AU - Yoshinori UZAWA
AU - Akira KAWAKAMI
AU - Zhen WANG
AU - Takashi NOGUCHI
PY - 1996
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E79-C
IS - 9
JA - IEICE TRANSACTIONS on Electronics
Y1 - September 1996
AB - A quasi-optical Superconductor-Insulator-Superconductor (SIS) mixer has been designed and tested in the 270-GHz band. The mixer used a substrate-lens-coupled log-periodic antenna and a tuning circuit for RF matching. The antenna is planar and self-complementary, and has a frequency-independent impedance of around 114 Ω over several octaves. The tuning circuit consists of two Nb/AIO_x/Nb tunnel junctions separated by inductance for tuning out the junction capacitances and a λ/4 impedance transformer for matching the resistance of the two-junction circuit to the antenna impedance. The IF output from the mixer is brought out in a balanced method at each edge of the antenna, and is coupled to a low noise amplifier through a balun transformer using a 180-degree hybrid coupler for broadband IF matching. Double sideband receiver noise temperatures, determined from experimental Y-factor measurements, are about 150 K across the majority of the desired operating frequency band. The minimum receiver noise temperature of 120 K was measured at 263 GHz, which is as low as that of waveguide receivers. At this frequency, measurement of the noise contribution to the receiver results in input losses of 90 K, mixer noise of 17 K, and multiplied IF noise of 13 K. We found that the major sources of noise in our quasi-optical receiver were the optical losses.
ER -