Microwave radiation imaging using inverse synthetic aperture radar technique

Ašmontas, Steponas; Kiprijanovič, O.; Levitas, B.; Matuzas, J.; Naidionova, Irina

doi:10.5755/j01.eee.21.1.5389

Cited by 4 publications

(6 citation statements)

References 12 publications

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“…where S i (0) is the sensitivity at low frequencies. Spectral dependence of voltage sensitivity of the wide-gated bow-tie diode calculated according to Equation (5) and assuming also τ i = 0.19 ps is depicted in Figure 6 by the red solid line. In the calculation, S i (0) was taken as 4 V/W to fit the theoretical curve with experimental points at low frequencies.…”

Section: Resultsmentioning

confidence: 99%

“…Ability of microwave (MW) and terahertz (THz) radiation to penetrate through a low conductivity medium and atmosphere makes it very attractive to be used in many fields, such as high-speed wireless communications [1][2][3], detection of concealed objects [4,5], medicine [6,7], materials science [8,9], and large area imaging [10,11]. Most of the potential microwave and THz applications require sensitive but robust detectors with fast response time operating at room temperature [12].…”

Section: Introductionmentioning

confidence: 99%

“…Currently, the most promising application for imaging and communications appears to be the broadband THz detection at room temperature in the non-resonant regime [22]. Moreover, microwave imaging, as it is known [5], is realized using ultra-wideband radar systems.…”

Section: Introductionmentioning

confidence: 99%

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Gated Bow-Tie Diode for Microwave to Sub-Terahertz Detection

Ašmontas

Anbinderis

Čerškus

et al. 2020

Sensors

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We propose a new design microwave radiation sensor based on a selectively doped semiconductor structure of asymmetrical shape (so-called bow-tie diode). The novelty of the design comes down to the gating of the active layer of the diode above different regions of the two-dimensional electron channel. The gate influences the sensing properties of the bow-tie diode depending on the nature of voltage detected across the ungated one as well as on the location of the gate in regard to the diode contacts. When the gate is located by the wide contact, the voltage sensitivity increases ten times as compared to the case of the ungated diode, and the detected voltage holds the same polarity of the thermoelectric electromotive force of hot electrons in an asymmetrically shaped n-n+ junction. Another remarkable effect of the gate placed by the wide contact is weak dependence of the detected voltage on frequency which makes such a microwave diode to be a proper candidate for the detection of electromagnetic radiation in the microwave and sub-terahertz frequency range. When the gate is situated beside the narrow contact, the two orders of sensitivity magnitude increase are valid in the microwaves but the voltage sensitivity is strongly frequency-dependent for higher frequencies.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gated Bow-Tie Diode for Microwave to Sub-Terahertz Detection

Ašmontas

Anbinderis

Čerškus

et al. 2020

Sensors

Self Cite

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“…In this sense, medical imaging systems based on signals with microwave-range frequencies are rising as a promising technique for on-time detection of this kind of breast cancer [ 4 , 8 ]. Moreover, microwave-based images can be used for the detection and characterisation of biological materials [ 9 ], thus providing interesting additional information.…”

Section: Introductionmentioning

confidence: 99%

Non-Invasive Microwave-Based Imaging System for Early Detection of Breast Tumours

et al. 2022

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This work introduces a microwave-based system able to detect tumours in breast phantoms in a non-invasive way. The data acquisition system is composed of a hardware system which involves high-frequency components (antennas, switches and cables), a microcontroller, a vector network analyser used as measurement instrument and a computer devoted to the control and automation of the operation of the system. Concerning the software system, the computer runs a Python script which is in charge of mastering and automatising all the required stages for the data acquisition, from initialisation of the hardware system to performing and saving the measurements. We also report on the design of the high-performance broadband antenna used to carry out the measurements, as well as on the algorithm employed to build the final medical images, based on an adapted version of the so-called Improved Delay-and-Sum (IDAS) algorithm improved by a Hamming window filter and averaging preprocessing. The calibration and start-up of the system are also described. The experimental validation includes the use of different tumour models with different dielectric properties inside the breast phantom. The results show promising tumour detection capabilities, even when there is low dielectric contrast between the tumoural and healthy tissues, as is the usual case for dense breasts in young women.

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“…These systems are used for far-distance imaging (Oka et al, 2008). Other imaging techniques include mechanical scanning when detectors are swept in the XY direction, phased array imaging for electromagnetic radiation arriving from different directions, interferometric imaging, imaging with synthetic aperture, and helical scanning (Oka et al, 2008;Goldsmith et al, 1993;Meng et al, 2018;Ašmontas, Kiprijanovič, Levitas, Matuzas & Naidionova, 2015).…”

Section: Application Technologies Of Electromagnetic Radiation In Mil...mentioning

confidence: 99%

Investigation of detection properties of planar microwave diodes based on A3B5 semiconductor compounds in millimeter–wavelength range

Anbinderis¹

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Vilnius, 2023Disertacija rengta [2016][2017][2018][2019][2020][2021][2022] metais Valstybiniame mokslinių tyrimų institute Fizinių ir technologijos mokslų centre. (Disertacija ginama eksternu.) Mokslinis konsultantas prof. dr. Algirdas SUŽIEDĖLIS (Valstybinis mokslinių tyrimų institutas Fizinių ir technologijos mokslų centras, elektros ir elektronikos inžinerija -T 001). Vilniaus Gedimino technikos universiteto ir Valstybinio mokslinių tyrimų instituto Fizinių ir technologijos mokslų centro Elektros ir elektronikos inžinerijos mokslo krypties disertacijos gynimo taryba: Pirmininkas prof. dr. Algirdas BAŠKYS (Vilniaus Gedimino technikos universitetas, elektros ir elektronikos inžinerija -T 001). Nariai: dr. Alvydas LISAUSKAS (Lenkijos mokslų akademijos Aukšto slėgio fizikos institutas, fizika -N 002), dr. Rimantas SIMNIŠKIS (Valstybinis mokslinių tyrimų institutas Fizinių ir technologijos mokslų centras, elektros ir elektronikos inžinerija -T 001), prof. dr. Voitech STANKEVIČ (Vilniaus Gedimino technikos universitetas, elektros ir elektronikos inžinerija -T 001), prof. habil. dr. Sigitas TAMULEVIČIUS (Kauno technologijos universitetas, fizika -N 002). Disertacija bus ginama viešame Elektros ir elektronikos inžinerijos mokslo krypties disertacijos gynimo tarybos posėdyje 2023 m. vasario 10 d. 10 val. Vilniaus Gedimino technikos universiteto senato posėdžių salėje.

show abstract

Microwave radiation imaging using inverse synthetic aperture radar technique

Cited by 4 publications

References 12 publications

Gated Bow-Tie Diode for Microwave to Sub-Terahertz Detection

Gated Bow-Tie Diode for Microwave to Sub-Terahertz Detection

Non-Invasive Microwave-Based Imaging System for Early Detection of Breast Tumours

Investigation of detection properties of planar microwave diodes based on A3B5 semiconductor compounds in millimeter–wavelength range

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