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Sandqvist A.,Albanova University Center | Hjalmarson A.,Chalmers University of Technology | Frisk U.,Omnisys Instruments AB | Lundin S.,OHB Sweden | And 3 more authors.
Astronomy and Astrophysics | Year: 2017

Context. The Odin satellite is now into its sixteenth year of operation, much surpassing its design life of two years. One of the sources which Odin has observed in great detail is the Sgr A complex in the centre of the Milky Way. Aims. To study the presence of NH3 in the Galactic centre and spiral arms. Methods. Recently, Odin has made complementary observations of the 572 GHz NH3 line towards the Sgr A +50 km s-1 cloud and circumnuclear disk (CND). Results. Significant NH3 emission has been observed in both the +50 km s-1 cloud and the CND. Clear NH3 absorption has also been detected in many of the spiral arm features along the line of sight from the Sun to the core of our Galaxy. Conclusions. The very large velocity width (80 km s-1) of the NH3 emission associated with the shock region in the southwestern part of the CND may suggest a formation/desorption scenario similar to that of gas-phase H2O in shocks/outflows. © ESO, 2017.

Agency: European Commission | Branch: FP7 | Program: CP-IP | Phase: NMP-2007-3.5-2 | Award Amount: 9.03M | Year: 2008

Various emerging markets in the field of non silicon multimaterial micro devices offer a huge potential for commercialisation in the near future. However, solutions for mass-production for most of them have still to be developed. The objective of the MULTILAYER project is to develop a set of solutions for the large-scale production of micro devices based on a technology we call Rolled multi material layered 3D shaping technology and using the concept of tape casting and advanced printing techniques. This technology will enable to manufacture complex multifunctional 3D-micro parts on a layer by layer manner and in a high-throughput context. Each layer can be given a specific structure. They will be printed and contain channels and cavities that are open or filled in a very high precision manner. The microsystems will have as basic building material ceramics, which is a clear advantage in applications that require high temperature, corrosive environments and long time reliability. Furthermore, it will allow spatial resolutions under 10 m and the ceramics tapes developed will be down to 10 m thin. The Rolled multi material layered 3D shaping technology will have several advantages: - it will be an efficient mass production method - the fabrication series can attain over a million units - it will offer a good flexibility for a wide variety possible component designs, - it will allow the integration of different materials as different layers enabling to manufacture multimaterial multilayered packages with a high degree of integration, - the process will be very reliable, indeed, every single layer can be advantageously inspected and controled

Agency: European Commission | Branch: FP7 | Program: CP | Phase: SPA.2009.2.2.01 | Award Amount: 2.00M | Year: 2010

Sub-millimetre wave or terahertz heterodyne receivers are key instruments for many space applications. For example, they are required for monitoring of the earths atmosphere or detection of molecules that might be tracers of life on other planets or moons. However, key components of these systems are currently supplied from outside Europe and performance as well as mass and power requirements often prohibit the implementation. The TeraComp project aims at developing European industrial level capability to design and manufacture terahertz front-end electronics based on high frequency Schottky diodes, Heterostructure Barrier Varactor (HBV) diodes and mHEMT MMICs for space and other applications. The prototype components will be integrated into a compact 557 GHz heterodyne receiver and evaluated for space instrument applications. The front-end demonstrator consists of a low noise 557 GHz subharmonic Schottky diode mixer, a 275 GHz Heterostructure Barrier Varactor frequency tripler and a 92 GHz mHEMT power amplifiers and a 15 to 92 GHz 6x multiplier as part of the local oscillator chain. This development will significantly contribute to mass and power reduction and it will improve the performance of terahertz heterodyne receivers. In addition, the dependence on critical technologies and capabilities from outside Europe for future space applications will be reduced.

Sobis P.J.,Omnisys Instruments AB | Sobis P.J.,Chalmers University of Technology | Emrich A.,Omnisys Instruments AB | Stake J.,Chalmers University of Technology
IEEE Transactions on Terahertz Science and Technology | Year: 2011

A novel high performance waveguide integrated sideband separating (2SB) Schottky receiver operating in the 320-360 GHz band is presented. The unique receiver design is based on a core of two subharmonic Schottky diode mixers with embedded LNA's with a minimum noise figure of 1.8 dB, fed by LO and RF quadrature hybrids. At room temperature, a typical receiver SSB noise temperature of 3000 K is measured over most of the band reaching a minimum of 2700 K, with only 4 mW of LO power. The sideband ratio (SBR) is typically below 15 dB over the whole band and the measured LO input return loss is typically below 15 dB broadband. High performance sideband separating Schottky receivers can now for the first time be considered for submillimeter wave systems enabling new types of instrument concepts. © 2011 IEEE.

Sobis P.J.,Chalmers University of Technology | Wadefalk N.,Chalmers University of Technology | Emrich A.,Omnisys Instruments AB | Stake J.,Chalmers University of Technology
IEEE Microwave and Wireless Components Letters | Year: 2012

A 340 GHz subharmonic Schottky diode mixer and a multioctave (3-16 GHz) custom low noise amplifier (LNA) have been integrated to form a compact receiver front-end module, exhibiting ultra low noise with an exceptional flat response and broadband instantaneous frequency coverage. At room temperature, a receiver noise temperature of 870 K is measured at an LO drive of 1.2 mW at 170 GHz. The total dc power consumption of the LNA is below 120 mW. Measurements are in good agreement with simulations taking the mixer and LNA mismatch interaction into account. © 2012 IEEE.

Zhao H.,Chalmers University of Technology | Tang A.-Y.,Chalmers University of Technology | Sobis P.,Omnisys Instruments AB | Sobis P.,Chalmers University of Technology | And 6 more authors.
IEEE Microwave and Wireless Components Letters | Year: 2011

We demonstrate S-parameter characterization of membrane circuits in the WR-03 frequency band (220325 GHz) utilizing thru-reflect-line (TRL) -calibration technique. The TRL calibration kit design features 3 μm thick GaAs membrane circuits packaged in E-plane split waveguide blocks with the reference planes inside the membrane circuit structure. A 300 GHz membrane ring resonator filter circuit has been characterized by applying the proposed calibration kit, showing good agreement with simulations. © 2010 IEEE.

Whale M.,University of Bern | Murphy A.,National University of Ireland, Maynooth | Murk A.,University of Bern | Renker M.,University of Bern | And 2 more authors.
IEEE Transactions on Terahertz Science and Technology | Year: 2013

In this paper, we present a novel technique for the removal of astigmatism in submillimeter-wave optical systems through employment of a specific combination of so-called astigmatic off-axis reflectors. This technique treats an orthogonally astigmatic beam using skew Gaussian beam analysis, from which an anastigmatic imaging network is derived. The resultant beam is considered truly stigmatic, with all Gaussian beam parameters in the orthogonal directions being matched. This is thus considered an improvement over previous techniques wherein a beam corrected for astigmatism has only the orthogonal beam amplitude radii matched, with phase shift and phase radius of curvature not considered. This technique is computationally efficient, negating the requirement for computationally intensive numerical analysis of shaped reflector surfaces. The required optical surfaces are also relatively simple to implement compared to such numerically optimized shaped surfaces. This technique is implemented in this work as part of the complete optics train for the STEAMR antenna. The STEAMR instrument is envisaged as a mutli-beam limb sounding instrument operating at submillimeter wavelengths. The antenna optics arrangement for this instrument uses multiple off-axis reflectors to control the incident radiation and couple them to their corresponding receiver feeds. An anastigmatic imaging network is successfully implemented into an optical model of this antenna, and the resultant design ensures optimal imaging of the beams to the corresponding feed horns. This example also addresses the challenges of imaging in multi-beam antenna systems. © 2011-2012 IEEE.

Sobis P.,Omnisys Instruments AB | Sobis P.,Chalmers University of Technology | Stake J.,Chalmers University of Technology | Emrich A.,Omnisys Instruments AB
IET Microwaves, Antennas and Propagation | Year: 2011

Two compact and simple to design differential phase shifter topologies, based on high/low-impedance transmission-line sections and open-ended coupled-line sections, are presented for the first time. The basic circuit theory for single section topologies is reviewed, leading to design equations and graphs for direct circuit synthesis. Balanced topologies and multiple section designs are also proposed improving the performance and feasibility of the phase shifters. Two planar microstrip single section differential phase shifter hybrids, at a centre frequency of 12 GHz and a 45 and 135° phase difference have been designed and manufactured. The designs have a simulated 0.5 dB amplitude and 1° phase imbalance over more than 25 and 40% bandwidth, respectively. Experimental results verify the circuit performance and feasibility of the proposed differential phase shifters. © 2011 The Institution of Engineering and Technology.

Stenarson J.,Chalmers University of Technology | Stenarson J.,SP Technical Research Institute of Sweden | Do T.N.T.,Chalmers University of Technology | Zhao H.,Chalmers University of Technology | And 5 more authors.
IEEE Transactions on Terahertz Science and Technology | Year: 2013

We present a sensitivity analysis on TRL calibrated S-parameter measurements of membrane circuits in the WR-03 waveguide band (220-325 GHz). The impact of waveguide and membrane circuit misalignment, as well as waveguide dimension mismatch is investigated. The analysis is performed for the thru-reflect-line (TRL) calibration applied to E-plane split waveguide blocks carrying membrane circuits. The analysis shows a large influence of the waveguide width tolerance on transmission and reflection phase after the TRL calibration. For a 20 mm long rectangular waveguide with a ±5μm width tolerance a phase uncertainty as large as ±45° for reflection and ±30° for transmission measurements is observed. © 2011-2012 IEEE.

Svedin J.,Swedish Defence Research Agency | Pellikka T.,Omnisys Instruments AB | Huss L.-G.,Swedish Defence Research Agency
Asia-Pacific Microwave Conference Proceedings, APMC | Year: 2011

A direct transition from microstrip line to rectangular waveguide compatible with millimeter-wave MMICs is presented. The transition is based on an aperture fed microstrip patch antenna radiating into the waveguide. The microstrip feed line and slot is patterned on the MMIC part and a novel approach using LTCC is presented for realization of the patch antenna and an extension of the waveguide using via walls. By this approach several transitions can be realized simultaneously and freely placed on one or more MMICs. The loss typically encountered going to a separate waveguide probe substrate is thus avoided. The design and simulation results for an LTCC-based transition at W-band is described and measurements on a test transition at G-band is reported. © 2011 Engineers Australia.

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