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

Efficient and compact frequency converters are essential for stabilization of terahertz sources. In this article, we present a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">${3.5}$</tex-math></inline-formula> -THz, notation="LaTeX">${\times 6}$</tex-math></inline-formula> -harmonic, integrated Schottky diode mixer operating at room temperature. The designed converter is based on single-ended, planar with...

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

We report on a heterodyne terahertz spectrometer based fully integrated 557-GHz receiver and digital fast Fourier transform spectrometer. The consists of chain multipliers power amplifiers, followed by heterostructure barrier varactor tripler that subharmonically pumps membrane GaAs Schottky diode mixer. All sub-components are newly developed optimized with regard to the overall performance such as noise temperature, consumption, weight physical size. works at room has double sideband...

We present the development of a monolithically integrated 557 GHz membrane Schottky diode mixer. RF test shows state-of-the-art performance with an optimum receiver noise temperature below 1300 K DSB and estimated mixer conversion loss 9 dB 1100 including all losses.

We present a 135deg/45deg phase shifter hybrid intended to be used in subharmonic sideband separation mixer schemes at submillimeter-wave frequencies. The design consists of an increased height 90deg 6-arm branch guide coupler with three stub loaded differential line 45deg the output. device has been implemented G-band E-plane WR-05 splitblock center frequency 170 GHz and 15 % bandwidth. Measured S-parameter are good agreement simulations showing isolation return loss better than 20 dB...

We present the progress of technological development a full e-beam based monolithically integrated Schottky diode process applicable for sub-millimetre wave multipliers and mixers. Evaluation has been done in number demonstrators showing state-of-the-art performance, including various multiplier circuits up to 200 GHz with measured flange efficiency above 35%, as well heterodyne receiver front-end modules operating at 340 557 DSB noise temperature below 700 K 1300 respectively.

In this paper, we present WR05 (140-220 GHz) and WR03 (220-325 five-stage amplifier modules with novel membrane microstrip-to-waveguide transitions. The use a 250-nm InP double heterojunction bipolar transistor (DHBT) technology multilayer thin-film microstrip transmission lines. waveguide transitions E-plane probes on 3- μm-thin GaAs substrate. Beam lead connectors integrated the transition eliminate need of highly reactive bond wires. addition, process steps such as backside metallization,...

The cryogenic indium phosphide (InP) high-electron-mobility transistor (HEMT) low-noise amplifier (LNA) is used for the readout amplification of qubits at <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$4$</tex-math> </inline-formula> K where cooling capabilities are limited implying that dc power active circuits an essential design constraint. In this article, RF and noise performance InP HEMT under...

Two compact and simple to design differential phase shifter topologies, based on high/low-impedance transmission-line sections open-ended coupled-line sections, are presented for the first time. The basic circuit theory single section topologies is reviewed, leading equations graphs direct synthesis. Balanced multiple designs also proposed improving performance feasibility of shifters. planar microstrip hybrids, at a centre frequency 12 GHz 45 135° difference have been designed manufactured....

Quantum-cascade lasers (QCLs) are critical components for high-resolution terahertz spectroscopy, especially in heterodyne spectrometers, where they serve as local oscillators. For this purpose, QCLs with stable frequencies and narrow linewidths essential since their spectral properties limit the resolution. We demonstrate phase-locking of around 3.5 THz 4.7 mechanical cryocoolers. These particularly interesting atmospheric research because correspond to hydroxyl radical neutral oxygen atom....

3-D models have been developed to study the series resistance (R <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">s</sub> ) at DC and extrinsic parasitic elements (capacitance inductance) high frequencies for a Schottky diode chip. For R study, comparison with experimental result has carried out. High frequency properties corresponding S-parameters of chip are simulated using finite element electromagnetic solver. The then extracted studied as...

We report on the development of two 874 GHz receiver channels with orthogonal polarizations for International Submillimetre Airborne Radiometer. A spline horn antenna and dielectric lens, a Schottky diode mixer circuit, an intermediate frequency (IF) low noise amplifier circuit were integrated in same metallic split block housing. This resulted mean double sideband (DSB) temperature 3300 K (minimum 2770 K, maximum 3400 K), achieved at operation 40 °C across 10 wide IF band. minimum DSB 2260...

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 and circuit misalignment, as well dimension mismatch is investigated. performed for thru-reflect-line (TRL) calibration applied to E-plane split blocks carrying circuits. shows large influence width tolerance transmission reflection phase after calibration. For 20 mm long rectangular with ± 5 μm uncertainty 45° 30° observed.

We demonstrate S-parameter characterization of membrane circuits in the WR-03 frequency band (220-325 GHz) utilizing thru-reflect-line (TRL) -calibration technique. The TRL calibration kit design features 3 μm thick GaAs packaged E-plane split waveguide blocks with reference planes inside circuit structure. A 300 GHz ring resonator filter has been characterized by applying proposed kit, showing good agreement simulations.

Efficient and reliable frequency converters, preferably operating at room temperature, are critical components for frequency-stabilizing terahertz sources. In this work, we present the analysis of optimum configurations Schottky diode based x4, x6, x8 harmonic mixers 2.3 THz, 3.5 4.7 THz respectively. Detailed large-signal two basic single-ended Z- Y-mixers was carried out using a standard model. For each case, conversion loss minimized by finding optimal embedding impedances RF, LO, IF...

We describe a versatile and cost-efficient method for producing smooth-walled spline horn antennas applications in THz radiometry. Specifically, the development of four different horns radiometer receiver at frequencies 120, 183, 340 874 GHz is presented. General methods efficient optimization profiles have been developed which enable designs to be tailored each application. All display high Gaussicity (typically ~98%). Manufacturing based on numerical milling splitblocks, lathing drilling...

In this paper, we report the development of single-ended, Schottky diode-based harmonic mixers operating at 3.5 THz and 4.7 THz, respectively. Both utilize a sub-micron size diode fabricated with circuit elements on suspended 2 µm-thick GaAs stripline circuit, then assembled in waveguide split-block. The is closely integrated RF-waveguide, resulting an electrically small compact circuit. For 3.5-THz, ×6-harmonic mixer, conversion loss about 60 dB was measured intermediate frequency (IF) 200...

We demonstrate the frequency stabilization of a terahertz quantum-cascade laser (QCL) to Lamb dip absorption line D2O rotational transition at 3.3809309 THz. To assess quality stabilization, Schottky diode harmonic mixer is used generate downconverted QCL signal by mixing emission with multiplied microwave reference signal. This directly measured spectrum analyzer showing full width half maximum 350 kHz, which eventually limited high-frequency noise beyond bandwidth loop.

This paper investigates the impact of waveguide width tolerance in TE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10</inf> mode TRL/LRL calibration kits. is important for vector network analyzer measurements THZ range where tolerances become large compared wavelength and to cross sectional dimensions. Besides causing reflections interface, also causes a change propagation constant that can shift reference planes cause problems estimating...

Low-power LNAs at 4 K are critical for the scaling up of quantum computing systems due to limited cooling capability in dilution refrigerator. This paper presents design and fabrication a cryogenic hybrid three-stage InP HEMT LNA working from 6 GHz. The was conducted using DC power optimized bias model HEMT. measurement showed 2.6 average noise temperature more than 22 dB gain consuming only <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$100...