A Low VSWR 2SB Schottky Receiver

Sobis, Peter; Emrich, Anders; Stake, Jan

doi:10.1109/tthz.2011.2166176

Cited by 34 publications

(11 citation statements)

References 28 publications

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“…The 3 dB coupler or hybrid is a special case of the directional coupler that provides equal power division/combination and 90 or 180 phase difference between the outputs depending on the design topology. The 3 dB coupler is one of the basic circuit components for balanced amplifiers [1], sideband separating (2SB) mixers [2]- [4], array antennas [5], filers, and more.…”

Section: Introductionmentioning

confidence: 99%

Design of Wideband Waveguide Hybrid With Ultra-Low Amplitude Imbalance

Rashid

Desmaris

Belitsky

et al. 2016

IEEE Trans. THz Sci. Technol.

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We present a design and synthesis procedure for a new 90 waveguide hybrid with ultra-low amplitude imbalance. This novel hybrid design is based on Reed's multiple branch waveguide hybrid. The primary feature of this quadrature hybrid design is the introduction of a controllable ripple in the operational band by, firstly changing the heights of the input and output branches and, secondly, by introducing three waveguide-height discontinuity sections placed symmetrically in the main waveguide. This layout allows ultra-low amplitude imbalance over a wide operational band. At the same time, it permits a greater input/output branch height as compared to the Reed's 5-branch waveguide hybrid, which should ease fabrication for short-mm and sub-mm wavelengths. This design concept is demonstrated through a 90 waveguide hybrid for the 159-216 GHz band (30% fractional bandwidth). Our simulations indicate that the amplitude imbalance of the hybrid is better than 0.2 dB over the most of the 159-216 GHz band with a phase imbalance better than 4 . Experimental verification of the hybrid shows excellent agreement with the simulations.

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Section: Introductionmentioning

confidence: 99%

Design of Wideband Waveguide Hybrid With Ultra-Low Amplitude Imbalance

Rashid

Desmaris

Belitsky

et al. 2016

IEEE Trans. THz Sci. Technol.

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“…We will only simulate left circular polarized radiation, and we assume 1500 K single-sideband system noise temperature. This number is a rough extrapolation to lower frequencies from the expected system noise temperature of the Jupiter Icy Moons' Sub-millimeter Wave Instrument's 600 GHz band (see Sobis et al, 2011, and Treuttel et al, 2016, for more details on the JUICE/SWI receiver). This extrapolation simply scales the SWI number by the frequency ratio of the channels and rounds the results up for good measure.…”

Section: Orbit and Sensor Considerationsmentioning

confidence: 99%

Martian magnetism with orbiting sub-millimeter sensor: simulated retrieval system

Larsson

Milz

Eriksson

et al. 2017

Geosci. Instrum. Method. Data Syst.

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Abstract. A Mars-orbiting sub-millimeter sensor can be used to retrieve the magnetic field at low altitudes over large areas of significant planetary crustal magnetism of the surface of Mars from measurements of circularly polarized radiation emitted by the 368 GHz ground-state molecular oxygen absorption line. We design a full retrieval system for one example orbit to show the expected accuracies on the magnetic field components that one realization of such a Mars satellite mission could achieve. For one set of measurements around a tangent profile, we find that the two horizontal components of the magnetic field can be measured at about 200 nT error with a vertical resolution of around 4 km from 6 up to 70 km in tangent altitude. The error is similar regardless of the true strength of the magnetic field, and it can be reduced by repeated measurements over the same area. The method and some of its potential pitfalls are described and discussed.

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“…The transmitter front-end consists of the antenna, a broadband Schottky doubler, an HBV varactor quintupler along with an isolator and a coaxial to waveguide transition. The receiver front-end shares its configuration with the transmitter with the exception of the doubler which is replaced by a second harmonic Schottky mixer [45].…”

Section: Overall System Setupmentioning

confidence: 99%

“…A second-harmonic Schottky mixer, described in [45], is used to down-convert the 346 GHz measurement signal to 912 MHz. The LO drive is provided by an HBV quintupler identical to the one used in the transmit chain.…”

Section: B High-frequency Front-endmentioning

confidence: 99%

A System for THz Imaging of Low-Contrast Targets Using the Born Approximation

Dahlbäck

Rubaek

Stake

2012

IEEE Trans. THz Sci. Technol.

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A THz imaging system, operating at 346 GHz and tailored for implementation of an imaging algorithm based on the Born approximation, is presented. The imaging algorithm provides focusing by compensating for the antenna footprint. This allows for using a more simple antenna system without optical focusing. Several aspects of implementing an imaging algorithm based on the Born approximation in THz imaging are discussed and key system properties are highlighted. The performance of the imaging algorithm is verified by imaging two simple dielectric targets. The results indicate that this approach provides a qualitative indication of the distribution of contrast in the samples complex permittivity and is a potential complement to existing imaging techniques.Index Terms-Terahertz, THz, sub-millimeter, imaging, Born approximation.R. Dahlbäck and J. Stake are with the Terahertz and Millimetre Wave Laboratory, Departement of Microtechnology and Nanoscience.T. Rubaek and M. Persson are with the Division

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A Low VSWR 2SB Schottky Receiver

Cited by 34 publications

References 28 publications

Design of Wideband Waveguide Hybrid With Ultra-Low Amplitude Imbalance

Design of Wideband Waveguide Hybrid With Ultra-Low Amplitude Imbalance

Martian magnetism with orbiting sub-millimeter sensor: simulated retrieval system

A System for THz Imaging of Low-Contrast Targets Using the Born Approximation

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