This letter reports on the first demonstration of a power-combined Schottky diode frequency doubler that uses counter-rotated E-fields at output two doublers to enable in-phase H-plane power-combining. The single chip integrated circuit comprises four-anode structure 20-μm-thick GaAs substrate when used individually demonstrates peak efficiency 34% and maximum power 109 mW 180 GHz. In configuration, with exhibits 3-dB bandwidth 10% conversion 37% for input powers between 150 200 mW. delivers...

A 290-310 GHz Schottky diode based subharmonic mixer with integrated, low loss, impedance matching waveguide cavity filters is presented in this paper. This was designed for use a 300 communication system 20 intermediate frequency band centred at 15 GHz. Image rejection of the 260-280 lower sideband, as well matching, achieved using an integrated third-order filter RF waveguide. The conventional coupling matrix used to design even though port complex and dependent. measured have: 1) single...

Manufacture and in-service assessment of composite materials can be challenging since there is, yet, no standard method for testing them. Nevertheless, regular inspection is necessary to maintain the structural integrity. This paper describes a nondestructive, broadband noise mapping that uses millimeter-wave radiometer detect defects in materials. The W-band system configured transmission mode measurement which an amplified photonic source illuminates glass fiber reinforced polymer...

Abstract A low loss metamaterial unit cell is presented with an integrated GaAs air-bridged Schottky diode to produce a dynamically tunable reflective phase shifter that capable of up 250° shift experimentally measured average 6.2 dB at V-band. The provides tuneable capacitance in the range between 30 and 50 fF under applied reverse voltage bias. This can be used alter resonant frequency response split patch periodic metasurface. die, which flip-chip soldered patch, has ultra-low parasitic...

Performance of a GaAs Schottky diode monolithic microwave integrated circuit (MMIC) with an waveguide backshort septum, comprising 1-2-μm-thick freestanding metal frame, is reported. The E-plane establishes short in the away from machined end wall. By defining effective using dependence multiplier performance on very high tolerance machining, this case output position, reduced. A frequency doubler design at 186 GHz exploiting approach described-with peak efficiency 40%, generates ~100 mW for...

This work presents the thermal analysis of a Schottky diode frequency doubler capable providing over 30 mW at 160 GHz room temperature. includes modeling its structure and characterization different temperature conditions. The multiplier chip layouts indicates that analyzed circuit uses optimum configuration from point view. Finally, performance predicted by physics-based numerical electro-thermal model for diodes integrated into simulator based on harmonic balance technique is also...

This paper presents the design and thermal analysis of a high-power Schottky diode frequency doubler at 160 GHz. The is capable achieving ~10% 3 dB bandwidth with peak conversion efficiency ~25% for an input power 100 mW 295 K. Thermal characterization includes modelling measurement dissipation in discrete under different temperatures. results obtained from experiments have been validated by physics-based electro-thermal simulator diodes.

This paper presents the design and performance of a x2x2 frequency multiplier chain from 40 to 160 GHz. The input power at GHz is 500 mW with final output 35 158 3 dB bandwidth over 10%. results demonstrate good agreement between modeled measured data. work described in this involved extensive thermal modelling structure including diode filter circuits; analysis allows handling for high applications.

This article reports on the first Schottky diode frequency doubler with a split-block waveguide structure fabricated by high-precision stereolithography (SLA) printing process. The printed polymer parts were plated copper and thin protective layer of gold. surface roughness has been characterized critical dimensions measured, revealing good quality as well dimensional accuracy that meets tight tolerance requirements for subterahertz active devices. 62.5 to 125 GHz circuit comprises 20 μm...

This paper describes the development and characterisation of broadband radiometers centered at 94 183 GHz for passive millimeter wave imaging NDT applications. The W-band radiometer has been built tested using both fundamental sub-harmonic mixer configurations. uses a front-end an LO that is common with fundamentally pumped receiver. In this case supplied via ~30 source which frequency tripled to 90 conversion efficiency around 10 %. IF bandwidth mixers about 18 while 12 GHz. room...

A 166/332GHz frequency doubler based on a Schottky diode has been designed and measured. It uses chip with two varactor diodes in balanced configuration, flip-chip mounted to 50um thick quartz filter substrate. The fixed tune split waveguide block for ease of assembly. Measurements show peak efficiency around 4.7% at 332.8GHz, 1.2 mW output power room temperature.

Millimeter wave radiometry is fast becoming a more widespread technique in imaging and non-destructive testing due to its inherent benefits over the visible spectrum. Transparency most non-conductive materials combined with better spatial resolution of objects are few underlining features using millimeter waves. This paper describes characterization two broadband, planar Schottky diode based radiometer modules centered at 94 GHz 183 GHz. The built W-band fundamental mixer configuration while...

A high-power Schottky diode frequency multiplier chain at 360 GHz, with a 3 dB bandwidth above 20 GHz is presented. The cascaded doublers show peak efficiencies of 35% and 23% 180 354 respectively. While the doubler generates maximum power 69 mW 300 input, second stage delivers 12 output GHz. Both consist low parasitic GaAs circuits optimized to handle high input powers, neither exhibit saturation highest applied power.

This paper presents the results for single and power-combined 180 GHz frequency doublers. The doubler comprising of a GaAs Schottky diode circuit has measured peak efficiency 34% bandwidth 11%. At an input power 500 mW, this chip generates 109 mW at GHz. In configuration with two devices adding in-phase, device demonstrates 105 output is thus capable generating more higher power.

Composite materials are used in a variety of industries ranging from oil and gas to aerospace for which structural failure can be catastrophic. Regular maintenance such structures becomes necessary after certain period. This paper describes non-destructive, non-intrusive, non-contact broadband imaging method that uses traditional millimeter-wave radiometry identify anomalies glass fiber reinforced plastic sample. The change signal transmission through the sample is detected by W-band...

A novel Schottky diode frequency doubler in E-band, using biased series-connected diodes the output waveguide, is reported. The was implemented a GaAs Monolithic Microwave Integrated Circuit (MMIC) process with integrated capacitors and beam leads. comparison made hybrid more conventional single-ended configuration two discrete planar transmission line circuit. Both devices exhibit excellent performance over 67–78 GHz design bandwidth, MMIC producing 25 to 55 mW at 12 22% power conversion...

A W-band Schottky diode based frequency tripler which uses waveguide resonator filters for low loss impedance matching is presented in this paper. Impedance of the diodes achieved by scaling external quality factors and adjusting resonant frequencies filter cavities. This removes most structures from high microstrip circuit to lower resonators. Here output set be 90 GHz with a 10% bandwidth. The simulation shows conversion 13-13.8 dB pass-band an input power 13-20 dBm. measured over...

The development is described of a 360 GHz sub-harmonic mixer for the active and passive sub-systems TeraSCREEN security scanner by STFC RAL Space. mixers operate as predicted with state-of-the-art performance. A radiometer sensitivity measurement also shows devices have outstanding

Imaging composite materials is a challenging task due to the continual improvement in material quality and inspection demands. This paper describes novel broadband THz noise mapping technique that performs active imaging of materials. The transmission measurement consists an amplified photonic source illuminate sample W-band Schottky diode based radiometer obtain intensity profile as function scan position. experimental set-up preliminary results are presented.

A W-band Schottky diode based frequency tripler which uses waveguide resonator filters for low loss impedance matching is presented in this paper. Impedance of the diodes achieved by scaling external quality factors and adjusting resonant frequencies filter cavities. This removes most structures from high microstrip circuit to lower resonators. Here output set be 90 GHz with a 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> bandwidth....

This paper describes the recent results obtained from high-power frequency multiplied sources typically using integrated GaAs Schottky diode circuits. The show that a single circuit can safely handle 500 mW input power, while generating more than 150 in power-combined configuration for doubler and about 25 tripler. discussion will mainly focus on millimeter-wave doublers triplers between 160 345 GHz.

This paper describes a new approach for the generation of broadband noise signal at millimeter-wave frequencies. The source consists heterodyne mixing upconverted baseband with local oscillator in Schottky diode mixer. Characterization shows an excess ratio roughly 25 dB W-band and 23 G-band.

TeraSCREEN is an EU FP7 Security project aimed at developing a combined active, with frequency channel centered 360 GHz, and passive, channels 94, 220 imaging system for border controls in airport commercial ferry ports. The will include automatic threat detection classification has been designed strong focus on the ethical, legal practical aspects of operating these environments potential threats mind. Furthermore, both passive active systems are based array receivers consisting 16 element...