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...

Background: The stable, safe, and reliable operation of the electric actuator valve system is crucial in industrial production. However, its faults can lead to production interruptions, equipment damage, increased costs. Therefore, detecting analyzing causes fault modes for exploring methods reduce their occurrence ensuring normal actuators. Methods: Taking IQ20-F14-A from Rotork, UK, as a reference, this paper analyzes phase loss mode three aspects: software, circuitry, external conditions....

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...

This paper presents a kind of multichannel THz detector using lens-based bow-tie array. A hyperhemispherical silicon lens is employed to provide focal plane; 8 elements are arranged on the plane with careful design show performance broadband, high gain, well compact, and easy assembling. These characteristics preferred for detecting weak signal. Measured far field shows that radiation pattern each element shifted angularly, by <i>&#x2248;</i>9&#xb0;, which can be used imaging. Tested...

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...

Abstract A compact 60‐GHz on‐chip bandpass filter (BPF) is presented using gallium arsenide (GaAs) technology. To demonstrate the working mechanism of proposed BPF, an inductor‐capacitor (LC) equivalent circuit model conceived and analysed for further investigation transmission poles (TPs) zeros. Finally, a prototype BPF fabricated tested to validate idea, whose simulated measured results are in good agreement. The measurements show that it has centre frequency 60.2 GHz with bandwidth 14%,...

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 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...

This paper presents a wire grid polarizer (WGP) working at the frequency ranges between 1 GHz to 500 GHz. The WGP is extensively used in polarization sensitive elements for separating different polarized signals same channel. spacing pitch-to-width ratio should be chosen seriously lower cross levels double polarizers. influences single and layers are also discussed simultaneously. layer simulation results of reflectance transmittance coefficients more than 0.96 directions, which has been...

ABSTRACT For amplitude and phase response calibration of moving‐coil electromagnetic geophones two parameters are needed, namely, the geophone natural frequency, f 0 , upper resonance frequency u . The phase‐ellipse method is commonly used for in situ determination these parameters. a given signal‐to‐noise ratio, precision measurement depends on sensitivity, f(δφ/δf) some commercial at can be an order magnitude less than sensitivity In this paper we present improved with increased precision....

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.

ABSTRACT With the renewed applications of millimeter wave technologies in remote sensing, radio astronomy, and quasi‐optical (QO) systems have been widely used various radiometer systems. Frequency selective surface (FSS) is one key components a QO system, functioning as frequency separation. For practical FSS component, small insertion loss narrow transition band from pass to stop are preferred maintain signal level reject out‐of‐band noise, respectively. In addition, bandwidth also...

Compact antenna test range (CATR) is an effective way for millimeter/sub millimeter testing. In this paper, geometric optics (GO) method utilized to design a tri-reflector CATR, the advantages of which lie in high reflector usage and low manufacture cost compared with conventional single CATR. Kinematic dynamic ray tracing theory used determine surface parameters two shaped subreflectors during process. A double-Gregorian CATR designed as example at last.

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...

Abstract A wideband bandpass filter (BPF) using capacitor-loaded coupled lines is proposed with super-compact circuit size and very simple structure. By loading three lumped capacitors in parallel to same pairs of lines, transmission poles four zeros can be achieved they calculated by input admittance derivation. To verify the design, a BPF prototype center frequency at 1.34 GHz fabricated, whose measured 3-dB fractional bandwidth 98.5 % (0.68–2 GHz), in-band insertion loss less than 0.5 dB,...

In this letter, a dual-band dual-polarization transmitarray with independent phase control is proposed. The polarization rotation achieved by changing the relative displacement of unit cell feed points, and then symmetric 1-bit cells are designed for realizing resolution in two distinct frequency bands. For validating design idea, prototype fabricated, whose measurements show high selectivity characteristics. It can achieve controllable collimation beam directions at different bands 6 8 GHz,...

During the machining of complex surface impeller-type parts, processing system together with quality machined could be affected by overall stiffness machine-cutting tool and distribution workpiece. In this paper, field model three-dimensional force ellipsoid are proposed constructed. particular for five-axis NC centre, corresponding sampling points set on workpiece applying matrix operations to multibody deformation theory. Moreover, an integrated is developed via different spatial gestures....