A5031361985- Superconducting and THz Device Technology
- Microwave Engineering and Waveguides
- Radio Frequency Integrated Circuit Design
- Physics of Superconductivity and Magnetism
- Radio Astronomy Observations and Technology
- Gyrotron and Vacuum Electronics Research
- Photonic and Optical Devices
- Astronomy and Astrophysical Research
- Advanced Frequency and Time Standards
- Particle accelerators and beam dynamics
- Semiconductor Quantum Structures and Devices
- GaN-based semiconductor devices and materials
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Microwave and Dielectric Measurement Techniques
- Advanced Thermodynamic Systems and Engines
- Semiconductor Lasers and Optical Devices
- Terahertz technology and applications
- Particle Accelerators and Free-Electron Lasers
- Silicon Carbide Semiconductor Technologies
- Superconductivity in MgB2 and Alloys
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Electromagnetic Compatibility and Noise Suppression
- Millimeter-Wave Propagation and Modeling
Chalmers University of Technology
2015-2024
Space Information Laboratories (United States)
2018
North Carolina State University
2018
Institute of Radio-Engineering and Electronics
1987-1995
Russian Academy of Arts
1995
Russian Academy of Sciences
1989-1993
<i>Aims. <i/>This paper describes the Heterodyne Instrument for Far-Infrared (HIFI) that was launched onboard ESA's <i>Herschel<i/> Space Observatory in May 2009. <i>Methods. <i/>The instrument is a set of 7 heterodyne receivers are electronically tuneable, covering 480–1250 GHz with SIS mixers and 1410–1910 range hot electron bolometer (HEB) mixers. The local oscillator (LO) subsystem comprises Ka-band synthesizer followed by 14 chains frequency multipliers 2 each band. A pair...
Aims. In March 2008, the APEX facility instrument was installed on telescope at site of Lliano Chajnantor in northern Chile. The main objective paper is to introduce new radio astronomical community. It describes hardware configuration and presents some initial results from on-sky commissioning.
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> In this paper, we report about the development, fabrication, and characterization of a balanced waveguide hot electron bolometer (HEB) receiver for Atacama Pathfinder EXperiment telescope covering frequency band 1.25–1.39 THz. The uses quadrature scheme two HEB mixers, fabricated from 4- to 5-nm-thick NbN film deposited on crystalline quartz substrate with an MgO buffer layer in between. We...
Millimetron is a Russian-led 12 m diameter submillimeter and far-infrared space observatory which included in the Space Plan of Russian Federation for launch around 2017. With its large collecting area state-of-the-art receivers, it will enable unique science allow at least one order magnitude improvement with respect to Herschel Observatory. be operated two basic observing modes: as single-dish observatory, an element ground-space very long baseline interferometry (VLBI) system. As...
We present performance of the first ALMA Band 5 production cartridge, covering frequencies from 163 to 211 GHz. Atacama Large Millimeter/sub-millimeter Array (ALMA) is a dual polarization, sideband separation (2SB) receiver based on all Niobium (Nb) superconductor–insulator–superconductor (SIS) tunnel junction mixers, providing 16 GHz instantaneous RF bandwidth for astronomy observations. The 2SB mixer each polarization employs quadrature configuration. occurs at output IF hybrid that has...
The suitability of AlxGa1−xN epilayers to deposit onto ultra-thin NbN films has been demonstrated for the first time. High quality single-crystal with 5 nm thickness confirmed by high resolution transmission electron microscopy (HRTEM) have deposited in a reproducible manner means reactive DC magnetron sputtering at elevated temperatures and exhibit critical (Tc) as 13.2 K residual resistivity ratio (RRR) ∼1 on hexagonal GaN epilayers. On increasing Al content x epilayer above 20%, gradual...
We present a design and synthesis procedure for new 90 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> waveguide hybrid with ultra-low amplitude imbalance. This novel is based on Reed's multiple branch hybrid. The primary feature of this quadrature the introduction controllable ripple in operational band by, firstly changing heights input output branches and, secondly, by introducing three waveguide-height discontinuity sections placed...
A novel device, a waveguide-to-microstrip transition with an integrated bias-T, is presented. The substrate-based planar structure comprises waveguide E-probe, shaped as radial line. probe couples the RF field of full-height to microstrip line or directly active component, e.g., transistor diode in mixer direct detector. connected on its wide side another port via specially high impedance that provides RF/DC isolation. This can then be used inject DC and/or extract IF signals. design...
Aims.The new APEX telescope, located on Llano Chajnantor in Northern Chile, will have high resolution spectroscopic instruments covering the wavelength region from 0.20 to 1.30 mm (210-1500 GHz).
We present a new design concept for 90° waveguide hybrid and its implementation. This novel is based on multiple branch hybrid. The primary feature of this quadrature the introduction controllable ripple in operational band achieving better overall amplitude imbalance. verified by implementation 166-208 GHz can be used hybrids up to several THz. Our simulations indicate that imbalance designed than 0.11 dB over most with phase ± 2.3°. Experimental verification shows excellent agreement an...
The HEterodyne Receiver for the Origins Space Telescope (HERO) is a proposed design heterodyne focal plane array large space mission. (OST) one of four missions selected to be studied by NASA 2020 Astronomy and Astrophysics Decadal survey. HERO designed observe trail water from interstellar medium (ISM) disks around protostars. In Concept 1, provides continuous frequency coverage 468 2700 GHz in five bands sixth band cover 4700 GHz. Most include 2 × 64 pixels providing at least an order...
Context: We describe the new SEPIA (Swedish-ESO PI Instrument for APEX) receiver, which was designed and built by Group Advanced Receiver Development (GARD), at Onsala Space Observatory (OSO) in collaboration with ESO. It installed commissioned APEX telescope during 2015 an ALMA Band 5 receiver channel updated a frequency (ALMA 9) February 2016. Aims: This manuscript aims to provide, observers who use reference terms of hardware description, optics performance as well commissioning results....
We describe the design, performance, and commissioning results for new ALMA Band 5 receiver channel, 163–211 GHz, which is in final stage of full deployment expected to be available observations 2018. This manuscript provides description cartridge serves as a reference observers using observations. At time writing this paper, Production Consortium consisting NOVA Instrumentation group, based Groningen, NL, GARD Sweden have produced delivered Observatory over 60 cartridges. All cartridges...
APEX, the Atacama Pathfinder Experiment, has been successfully commissioned and is in operation now. This novel submillimeter telescope located at 5107 m altitude on Llano de Chajnantor Chilean High Andes, what considered one of world's outstanding sites for astronomy. The primary reflector with 12 diameter carefully adjusted by means holography. Its surface smoothness 17-18 μm makes APEX suitable observations up to 200 μm, through all atmospheric submm windows accessible from ground.
In this paper, we present the comprehensive characterization of a waveguide balanced phonon-cooled NbN hot electron bolometer (HEB) mixer on GaN buffer-layer operating at approximately 1.3 terahertz (THz). The measured uncorrected double sideband noise temperature was as low 750 K 1 GHz intermediate frequency (IF) and 900 4 IF, respectively, suggests bandwidth 7 GHz. Moreover, IF gain HEB itself deduced from mixing experiment with second monochromatic THz signal source has shown 3 dB...
In this paper, we present studies of room temperature aging and annealing Nb/Al–AlOx/Nb tunnel junctions with the size 2–3 μm2. We observed a noticeable drop junction normal resistance Rn unusually combined increase in subgap Rj as result aging. Variation both are subject to effect. An effect history on degradation after consequent was discovered. Discussion interpretation phenomena presented terms structural ordering reconstruction AlOx layer, driven by diffusion flows enhanced due stress...
Aim: The aim of this work is to search Seyfert 2 galaxy NGC 4945, a well-known 22 GHz water megamaser galaxy, for (mega)maser emission at 183 GHz. Method: We used APEX SEPIA Band 5 perform the observations. Results: detected maser towards 4945 with peak flux density ~3 Jy near galactic systemic velocity. spans velocity range several hundred km/s. estimate an isotropic luminosity > 1000 Lsun, classifying as megamaser. A comparison spectrum that observed suggests also arises from active...
A new receiver for the Onsala 20 m antenna with possibility of being equipped 3 mm and 4 bands has been built channel commissioned during Spring 2014. For single-dish operation, uses an innovative on-source/off-source optical switch. In combination additional components within same layout, switch provides two calibration loads (for channels), sideband rejection measurement, tuning possibilities. The layout employs all cold (4 K) offset elliptical mirrors both channels, whereas on-off flat...
We present a novel compact wideband waveguide T-junction power divider especially suited for mm-wave and THz frequencies.It incorporates substrate-based elements into structure to provide the output port's isolation matching.The internal port is introduced at apex of Tjunction formed as E-probe on substrate.This facilitates efficient coupling reflected energy from thin-film based resistive termination integrated with onto same substrate fabricated by means thinfilm technology.A was designed,...
In this paper, we describe our progress in micromachining of submillimeter waveguide structures such as a quadrature coupler which is part THz balanced heterodyne receiver. We have set up and developed pilot testing the process with required high quality structure.
We present here the design and characterization of an intermediate frequency (IF) assembly comprising a compact 90° hybrid chip (coupled line coupler -Lange coupler-coupled coupler), two bias-T circuits for biasing Superconductor-Insulator-Superconductor (SIS) mixers, transmission circuits.Specifically, miniaturized 3-section fabricated using thin-film technology utilizes superconducting Niobium (Nb) lines, air bridges to connect fingers Lange (middle section), is complemented with...
This letter presents a novel approach for packaging millimeter-wave (mmW) and terahertz (THz) circuits. The proposed technique relies on using an on-chip coupling structure that couples the signal to quarter-wavelength cavity, which in turn either waveguide (WG) or another chip. solution also uses periodic electromagnetic bandgap (EBG) controls wave prevents field leakage undesired directions. is fabricated demonstrated at D-band (110-170 GHz), measurement results show it achieves minimum...
The superconductor–insulator–superconductor (SIS) tunnel junction based on Nb material has been investigated theoretically at frequencies of 200–1400 GHz by modeling it as a segment superconducting microstrip transmission line and using the Mattis–Bardeen theory anomalous skin effect. was used to predict performance flux-flow oscillator (FFO) SIS frequency down-converter (mixer). It is shown that in FFO internal loss (quasiparticle surface) limits flux flow band 260–770 GHz. A micron size...
We present the design and performance of a fixed-tuned, all niobium (Nb) Superconductor-Insulator-Superconductor (SIS) mixer covering RF frequencies from 163 to 211 GHz with 4-8 IF bandwidth. The uses two Nb/Al-AlOx/Nb junctions size 3 μm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> each <i xmlns:xlink="http://www.w3.org/1999/xlink">R</i> <sub xmlns:xlink="http://www.w3.org/1999/xlink">n</sub>...