Design, simulation, fabrication, packaging and testing of an AlGaAs/GaAs Gunn diode at 94 GHz

Sharma, Sanjeev K.; Kim, Deuk Young

doi:10.3938/jkps.67.619

Cited by 8 publications

(4 citation statements)

References 23 publications

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“…The window frames were designed to match the size of 2 mmφ × 3 mm height of the NIR LEDs, to tightly embed those miniature photo-sources. This potentially facilitates the built-in implementation of other types of miniature photo-sources, together with recent progress in portable photo-sources, such as quantum cascade laser (Mid-IR) 55 , resonant tunnelling diode (THz) 56 and Gunn diode chip (sub-THz, MMW) 57 . In particular, in situ non-destructive omni-directional photo-monitoring of aerial distribution lines (the inner spiral metallic wire bundle was coated with a rubber insulator with a thickness of a few mm) can be performed 58 by employing the IMPATT and Gunn diodes.…”

Section: Resultsmentioning

confidence: 99%

Robot-assisted, source-camera-coupled multi-view broadband imagers for ubiquitous sensing platform

Yuasa

Utaki

et al. 2021

Nat Commun

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Multi-functional photo-imaging garners attention towards the development of universal safety-net sensor networks. Although there are urgent needs to comprehensively address the optical information from arbitrarily structured and located targets, investigations on multi-view sensitive broadband monitoring, being independent of the operating environment, are yet to be completed. This study presents a robot-assisted, photo-source and imager implanted, multi-view stereoscopic sensitive broadband photo-monitoring platform with reflective and transmissive switchable modes. A multifaceted photo-thermoelectric device design based on flexible carbon nanotube films facilitates the prototype demonstrations of non-destructive, target-structure-independent, free-form multi-view examinations on actual three-dimensional industrial components. Further functionalisation, namely, a portable system utilising three-dimensional printing and ultraviolet processing, achieves the unification of freely attachable photo-imagers and miniature photo-sources, enabling location-independent operation. Consequently, the non-destructive unmanned, remote, high-speed, omni-directional testing of a defective aerial miniature model winding road-bridge with a robot-assisted photo-source imager built into a multi-axis movable photo-thermoelectric monitor arm is demonstrated.

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Section: Resultsmentioning

confidence: 99%

Robot-assisted, source-camera-coupled multi-view broadband imagers for ubiquitous sensing platform

Yuasa

Utaki

et al. 2021

Nat Commun

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“…The concept demonstrated here potentially handles universally structured objects under proper selection of the imaging wavelength freely in ultrabroadband ranges with the optical properties of the module. Furthermore, integrating miniature photo-sources, such as short-wavelength-IR LEDs, long-wavelength-IR quantum cascade lasers [ 66 ], THz resonant tunneling diodes [ 67 ], and sub-THz Gunn diode chips [ 68 ], with the reflective module by embedding them into the body’s window potentially allows compact and mobile systemizations for ubiquitous inspections. The potential inspection and reconstruction targets in the industrial field are multilayered columnar components, such as power transmission lines or communication cables, which require high safety standards.…”

Section: Applications: Ubiquitous Non-destructive Inspectionsmentioning

confidence: 99%

Recent Progress in Development of Carbon-Nanotube-Based Photo-Thermoelectric Sensors and Their Applications in Ubiquitous Non-Destructive Inspections

Kinoshita

Sakai

et al. 2022

Micromachines

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The photo-thermoelectric (PTE) effect in electronic materials effectively combines photo-absorption-induced local heating and associated thermoelectric conversion for uncooled and broadband photo-detection. In particular, this work comprehensively summarizes the operating mechanism of carbon nanotube (CNT)-film-based PTE sensors and ubiquitous non-destructive inspections realized by exploiting the material properties of CNT films. Formation of heterogeneous material junctions across the CNT-film-based PTE sensors, namely photo-detection interfaces, triggers the Seebeck effect with photo-absorption-induced local heating. Typical photo-detection interfaces include a channel–electrode boundary and a junction between P-type CNTs and N-type CNTs (PN junctions). While the original CNT film channel exhibits positive Seebeck coefficient values, the material selections of the counterpart freely govern the intensity and polarity of the PTE response signals. Based on these operating mechanisms, CNT film PTE sensors demonstrate a variety of physical and chemical non-destructive inspections. The device aggregates broad multi-spectral optical information regarding the targets and reconstructs their inner composite or layered structures. Arbitrary deformations of the device are attributed to the macroscopic flexibility of the CNT films to further monitor targets from omni-directional viewing angles without blind spots. Detection of blackbody radiation from targets using the device also visualizes their behaviors and associated changes.

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“…Modeling of diode's package was also performed in HFSS. Commercially available Gunn diode consists of a GaAs Gunn device along with its package . In our SDO design, a standard package at W‐band was considered for initial analysis.…”

Section: Cad Of Single Diode Oscillator Structure and Simulationmentioning

confidence: 99%

Design and optimization of a tunable W‐band subharmonic cavity based Gunn diode oscillator using computer‐aided design technique

Singh

Kumar

Biswas

2019

Int J RF Microw Comput Aided Eng

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In this work, a systematic computer‐aided design technique is proposed to minimize the fabrication iteration for the design and development of W‐band subharmonic Gunn diode oscillator with wideband tunable bandwidth at W‐band. Gunn diode based single diode oscillator structure was divided into passive and active parts to facilitate the modeling of the component on appropriate simulation environment. Resonating structure and package of Gunn diode are modeled as passive circuit in high frequency structure simulator (HFSS). To satisfy the oscillator design equation, disc‐post resonating structure is tuned in HFSS and its S‐parameters are collaborated with the model of Gunn diode in advanced design system. Magnitude and phase of reflection coefficient (S11) is observed to ascertain the desired frequency of oscillation. Proper tuning of disc‐post structure is done on simulation platform, which reduces the fabrication complexity and cost as well. The measurement results validate the models designed using EM and circuit simulator. The measured maximum stable RF power without any fabrication iteration is 14.2 dBm. A tunable bandwidth of 4 GHz with power output ripple of ±1 dB is measured by using a movable backshort.

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Design, simulation, fabrication, packaging and testing of an AlGaAs/GaAs Gunn diode at 94 GHz

Cited by 8 publications

References 23 publications

Robot-assisted, source-camera-coupled multi-view broadband imagers for ubiquitous sensing platform

Robot-assisted, source-camera-coupled multi-view broadband imagers for ubiquitous sensing platform

Recent Progress in Development of Carbon-Nanotube-Based Photo-Thermoelectric Sensors and Their Applications in Ubiquitous Non-Destructive Inspections

Design and optimization of a tunable W‐band subharmonic cavity based Gunn diode oscillator using computer‐aided design technique

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