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Journal articles on the topic 'Mm-wave/THz frequency ablation'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

An, Jinsu, Dong-Sung Won, Yubeen Park, et al. "Effects of changes in the waveform and frequency of radio frequency energy on tissue ablation range." PLOS ONE 19, no. 9 (2024): e0308691. http://dx.doi.org/10.1371/journal.pone.0308691.

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This study reports the effects of changes in the waveform and frequency of radio frequency (RF) energy on the tissue ablation range. We developed a 70-watt RFA generator that provides sine and square waves and allows frequency control between 10 Hz and 500 kHz. The changes in the ablation range according to the waveform and frequency were observed using the developed generator. In the waveform variation test, the distance between the electrodes and the electrode type were changed for both waveforms with the frequency set to 500 kHz. In the frequency variation test, the waveform and electrode t

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2

Neelakanta, Perambur. "de Novo Radio Frequency Ablation Therapy: Application of Unexplored Electromagnetic Spectral Resources of mm-Wave/THz Band in Clinical Ablation Procedures – A Review." British Journal of Medicine and Medical Research 3, no. 4 (2013): 1701–30. http://dx.doi.org/10.9734/bjmmr/2013/4368.

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3

GEYİKOĞLU, Miraç Dilruba, Hilal KOÇ, Bülent ÇAVUŞOĞLU, Mehmet ERTUGRUL, and Karim ABBASİAN. "Designing Graphene-Based Antenna for Terahertz Wave Ablation (TWA) System." Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi 15, no. 2 (2022): 507–14. http://dx.doi.org/10.18185/erzifbed.1014513.

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Cancer is one of the most feared health problems today. Studies on cancer diagnosis and treatment are carried out intensively. In this study, a graphene-based antenna is proposed for cancer diagnosis and treatment with THz radiation therapy, which is a relatively new radiation technique. A graphene-based two-layer monopole antenna is designed for 1.65THz operation frequency. To change the bandwidth and radiation pattern without changing the operating frequency, a graphene ring is placed on the SiO2 substrate (2nd layer).Antenna performance is analyzed for reflection coefficient, realized gain,

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Huang, Hsin-hui, Takeshi Nagashima, Tetsu Yonezawa, et al. "Giant Enhancement of THz Wave Emission under Double-Pulse Excitation of Thin Water Flow." Applied Sciences 10, no. 6 (2020): 2031. http://dx.doi.org/10.3390/app10062031.

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Simultaneous measurements of THz wave and hard X-ray emission from thin and flat water flow when irradiated by double femtosecond laser pulses (800 nm, 35 fs/transform-limited, 0.5 kHz, delay times up to 15 ns) were carried out. THz wave measurements by time-domain spectroscopy and X-ray detection by Geiger counters were performed at the transmission and the reflection sides of the flow. THz wave emission spectra show their dynamic peak shifts toward the low frequency with the highest intensity enhancements more than 1.5 × 10 3 times in |E| 2 accumulated over the whole spectrum range of 0–3 TH

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Gastal, E. L., M. O. Gastal, M. A. Beg, and O. J. Ginther. "Interrelationships among follicles during the common-growth phase of a follicular wave and capacity of individual follicles for dominance in mares." Reproduction 128, no. 4 (2004): 417–22. http://dx.doi.org/10.1530/rep.1.00259.

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The changing diameter interrelationships among follicles during the interval from emergence to deviation (common-growth phase) were studied in 59 mares. All follicles of ≥6.0 mm were ablated 10 days after ovulation. The four largest follicles of the postablation wave were ranked D1, D2, D3 and D4 at the expected beginning of deviation (D1 ≥ 20.0 mm), according to descending diameter. The four follicles were also ranked independently, according to order of emergence at 6.0–6.9 mm as E1 (first to emerge), E2, E3 and E4. The follicles emerged during 1.3 ± 0.1 to 3.1 ± 0.1 days, and expected devia

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Nagel, Claudia, Nicolas Pilia, Laura Unger, and Olaf Dössel. "Performance of Different Atrial Conduction Velocity Estimation Algorithms Improves with Knowledge about the Depolarization Pattern." Current Directions in Biomedical Engineering 5, no. 1 (2019): 101–4. http://dx.doi.org/10.1515/cdbme-2019-0026.

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AbstractQuantifying the atrial conduction velocity (CV) reveals important information for targeting critical arrhythmia sites that initiate and sustain abnormal electrical pathways, e.g. during atrial flutter. The knowledge about the local CV distribution on the atrial surface thus enhances clinical catheter ablation procedures by localizing pathological propagation paths to be eliminated during the intervention. Several algorithms have been proposed for estimating the CV. All of them are solely based on the local activation times calculated from electroanatomical mapping data. They deliver fa

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7

Kostyleva, N. M., and О. Yu Usenko. "Evaluation of the effectiveness of radiofrequency ablation of colorectal cancer metastases using shear wave elastometry." Український радіологічний та онкологічний журнал 33, no. 2 (2025): 200–211. https://doi.org/10.46879/ukroj.2.2025.200-211.

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Background. Radiofrequency ablation of metastatic foci in the liver is one of the therapeutic techniques indicated for patients with synchronous and/or metachronous colorectal cancer (CRC) metastases in the liver. Purpose – to investigate the feasibility of using ultrasound liver elastometry to monitor the implementation and evaluate the effectiveness of RFA of liver metastases of CRC. Materials and methods. A comparative study of the results of percutaneous RFA of hepatic metastases of CRC in two representative groups of patients aged 43 to 84 years (mean – 59.8 ± 10.0 years) was performed. G

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8

Kisiel, Z., L. Kolesniková, A. Belloche, et al. "Millimetre-wave laboratory study of glycinamide and a search for it with ALMA towards Sagittarius B2(N)." Astronomy & Astrophysics 657 (January 2022): A99. http://dx.doi.org/10.1051/0004-6361/202142350.

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Context. Glycinamide (NH2CH2C(O)NH2) is considered to be one of the possible precursors of the simplest amino acid, glycine. Its only rotational spectrum reported so far has been in the centimetre-wave region on a laser-ablation generated supersonic expansion sample. Aims. The aim of this work is to extend the laboratory spectrum of glycinamide to the millimetre (mm) wave region to support searches for this molecule in the interstellar medium and to perform the first check for its presence in the high-mass star forming region Sagittarius B2(N). Methods. Glycinamide was synthesised chemically a

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9

Polat, Hilal Koç. "A Comparative Analysis of Graphene Cladding Rectangular Waveguides Filled with Various Materials for 1.65 THz Ablation System." October 2023 4, no. 4 (2024): 1–4. http://dx.doi.org/10.36937/ben.2023.4880.

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Today, cancer diagnosis and treatment with the THz radiation model (THz wave ablation) is a subject of interest to researchers. The design performance of THz ablation systems depends on the design of a waveguide that will provide low-loss transmission of radiation from the antenna to the tissue. In this study, first of all, the superiority of graphene over noble metal is demonstrated. Then, the performance of THz rectangular waveguides which use graphene cladding and different core materials such as Silicon (Si), Silica (SiO2), Zeonex, Teflon, and PMMA (Polymethyl methacrylate) are comparative

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10

Md Rabiul Awal, Muhammad Syarifuddin Yahya, Nurafnida Afrizal, Ahmad Zaki Annuar, and Wan Hafiza Wan Hassan. "Impact of THz Frequency on Underwater Acoustic Wave Propagation for Short Range Wireless Applications." CFD Letters 13, no. 11 (2021): 116–25. http://dx.doi.org/10.37934/cfdl.13.11.116125.

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Acoustic propagation in seawater is an important aspect of scientific investigation. However, the impact of the THz scale frequencies for acoustic propagation is not included in the studies. Thus, a finite element analysis of such propagation in a seawater medium is presented in this paper applying THz frequencies. A transmitter (circular with a diameter of 14 mm, a thickness of 3 mm) and a rectangular receiver (20×10×0.5 mm3) are designed to trace the variations in the propagation mediums. A propagation medium of seawater (70×40×60 mm3) with ice and softwood is modelled. A scale of frequencie

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11

Ghosh, Monisha, Arindam Biswas, and Aritra Acharyya. "Terahertz Radiators Based on Si~3C-SiC MQW IMPATT Diodes." Nanoscience & Nanotechnology-Asia 10, no. 4 (2020): 501–6. http://dx.doi.org/10.2174/2210681209666190807154014.

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Aims:: The potentiality of Multiple Quantum Well (MQW) Impacts Avalanche Transit Time (IMPATT) diodes based on Si~3C-SiC heterostructures as possible terahertz radiators have been explored in this paper. Objective:: The static, high frequency and noise performance of MQW devices operating at 94, 140, and 220 GHz atmospheric window frequencies, as well as 0.30 and 0.50 THz frequency bands, have been studied in this paper. Methods: The simulation methods based on a Self-Consistent Quantum Drift-Diffusion (SCQDD) model developed by the authors have been used for the above-mentioned studies. Resul

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12

Shin, Bong-Rim, In Cheol Yu, Myeong-Hoon Shin, Mojca Jazbinsek, Fabian Rotermund, and O.-Pil Kwon. "Efficient organic terahertz generator with extremely broad terahertz molecular vibrational mode-free range." APL Materials 11, no. 1 (2023): 011101. http://dx.doi.org/10.1063/5.0116905.

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For nonlinear optical materials to be applicable as efficient broadband terahertz (THz) wave generators, low absorption with wide transparency in the THz frequency range is highly important. In this study, we report efficient organic THz wave generators, 2-(4-hydroxystyryl)-1-methylquinolinium 4-bromobenzenesulfonate (OHQ-BBS) single crystals. Interestingly, the OHQ-BBS crystals exhibit a wide molecular vibrational mode-free range in the THz frequency region from 1.7 to 5.1 THz with an absorption coefficient of <20 mm−1. By optical rectification employing 130 fs pump pulses at 1300 nm wavel

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13

Iba, Ayato, Makoto Ikeda, Verdad C. Agulto, Valynn Katrine Mag-usara, and Makoto Nakajima. "A Study of Terahertz-Wave Cylindrical Super-Oscillatory Lens for Industrial Applications." Sensors 21, no. 20 (2021): 6732. http://dx.doi.org/10.3390/s21206732.

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This paper describes the design and development of a cylindrical super-oscillatory lens (CSOL) for applications in the sub-terahertz frequency range, which are especially ideal for industrial inspection of films using terahertz (THz) and millimeter waves. Product inspections require high resolution (same as inspection with visible light), long working distance, and long depth of focus (DOF). However, these are difficult to achieve using conventional THz components due to diffraction limits. Here, we present a numerical approach in designing a 100 mm × 100 mm CSOL with optimum properties and pe

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14

Mai, A., I. Garcia Lopez, P. Rito, et al. "High-Speed SiGe BiCMOS Technologies and Circuits." International Journal of High Speed Electronics and Systems 26, no. 01n02 (2017): 1740002. http://dx.doi.org/10.1142/s012915641740002x.

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This work reports on the development of SiGe-BiCMOS technologies for mm-wave and THz high frequency applications. We present state-of-the-art performances for different SiGe heterojunction bipolar transistor (SiGe-HBT) developments as well as the evolution of complex BiCMOS technologies. With respect to different technology generations of high-speed SiGe-BiCMOS processes at IHP we discuss selected device modifications of the SiGe-HBT to achieve high frequency performances of a complex BiCMOS technology towards the 0.5 THz regime. We show the difference of high-frequency performance difference

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15

Anilkumar, Patibandla, Shaomeng Wang, and Yubin Gong. "Challenges in the Design and Development of Slow-Wave Structure for THz Traveling-Wave Tube: A Tutorial Review." Electronics 14, no. 13 (2025): 2624. https://doi.org/10.3390/electronics14132624.

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As solid-state devices continue to advance, vacuum electron devices maintain critical importance due to their superior high-frequency power handling, long-term reliability, and operational efficiency. Among these, traveling-wave tubes (TWTs) excel in high-power microwave (HPM) applications, offering exceptional bandwidth and gain. However, developing THz-range TWT slow-wave structures (SWSs) presents significant design challenges. This work systematically outlines the SWS design methodology while addressing key obstacles and their solutions. As a demonstration, a staggered double vane (SDV) SW

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16

Mehrotra, Parikha, Baibhab Chatterjee, and Shreyas Sen. "EM-Wave Biosensors: A Review of RF, Microwave, mm-Wave and Optical Sensing." Sensors 19, no. 5 (2019): 1013. http://dx.doi.org/10.3390/s19051013.

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This article presents a broad review on optical, radio-frequency (RF), microwave (MW), millimeter wave (mmW) and terahertz (THz) biosensors. Biomatter-wave interaction modalities are considered over a wide range of frequencies and applications such as detection of cancer biomarkers, biotin, neurotransmitters and heart rate are presented in detail. By treating biological tissue as a dielectric substance, having a unique dielectric signature, it can be characterized by frequency dependent parameters such as permittivity and conductivity. By observing the unique permittivity spectrum, cancerous c

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17

Dash, Shikhar, Varun Mathur, Nilesh Pandey, and Ravindra K. Sinha. "Terahertz Wave Propagation Characteristics in Graded Teflon Based Solid-Core Photonic Crystal Fibre." Journal of Physics: Conference Series 2426, no. 1 (2023): 012021. http://dx.doi.org/10.1088/1742-6596/2426/1/012021.

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Abstract In the past few years, photonic crystal fibre (PCF) in the Terahertz spectrum is drawing significant attention because of its multifaceted applications in high-speed data communication, spectroscopy, sensing, etc. The proposed PCF structure is based on a Teflon solid core surrounded by porous cladding. Teflon has been used as a background material because of its high flexibility and the possibility of making longer PCFs, which is capable of guiding waves in the THz region. The porous cladding consists of circular air-holes positioned hexagonally whose diameters increase with each subs

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18

Salhi, M. A., T. Kleine-Ostmann, and T. Schrader. "Propagation Channel Measurements in the mm- and Sub-mm Wave Range for Different Indoor Communication Scenarios." Journal of Infrared, Millimeter, and Terahertz Waves 42, no. 4 (2021): 357–70. http://dx.doi.org/10.1007/s10762-021-00785-8.

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AbstractIncreasing data rates in wireless communications are accompanied with the need for new unoccupied and unregulated bandwidth in the electromagnetic spectrum. Higher carrier frequencies in the lower THz frequency range might offer the solution for future indoor wireless communication systems with data rates of 100 Gbit/s and beyond that cannot be located elsewhere. In this review, we discuss propagation channel measurements in an extremely broad frequency range from 50 to 325 GHz in selected indoor communication scenarios including kiosk downloading, office room communication, living roo

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19

Feng, Yukang, Han-yu Tsao, and N. Scott Barker. "THz MEMS Switch Design." Micromachines 13, no. 5 (2022): 745. http://dx.doi.org/10.3390/mi13050745.

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In this work, an mm-wave/THz MEMS switch design process is presented. The challenges and solutions associated with the switch electrical design, modeling, fabrication, and test are explored and discussed. To investigate the feasibility of this design process, the switches are designed on both silicon and fused quartz substrate and then tested in the 140–750 GHz frequency range. The measurement fits design expectations and simulation well. At 750 GHz the measurement results from switches on both substrates have an ON state insertion loss of less than 3 dB and an OFF state isolation larger than

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Fedotov, A. E., V. L. Bratman, P. B. Makhalov, and V. N. Manuilov. "Design of mm-wave slow-wave devices with sheet and hollow electron beams." EPJ Web of Conferences 195 (2018): 01026. http://dx.doi.org/10.1051/epjconf/201819501026.

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The frequency increase of the slow-wave electron devices is accompanied by inevitable increase of the electron current density and ohmic losses which strongly restricts the attainable power. In recent years, the use of the spatially-developed sheet electron beams is considered as the major way to develop the medium-power slow-wave devices at mm and sub-THz waves. Hollow electron beams is another configuration which could be used for this purpose. The designs of the oscillators and amplifiers in Ka-band and W-band with both sheet and hollow electron beams are considered and compared.

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Amanatiadis, Stamatios, Theodosios Karamanos, Fabrice Lemoult, and Nikolaos V. Kantartzis. "Enhanced mm-Wave Frequency Up-Conversion via a Time-Varying Graphene Aperture on a Cavity Resonator." Micromachines 16, no. 6 (2025): 679. https://doi.org/10.3390/mi16060679.

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The transition to 5G and beyond has highlighted the need for efficient devices that operate at mm-wave frequencies, which require new structures and pose fabrication challenges. This paper proposes a novel non-linear antenna that combines the well-established substrate-integrated cavity (SIC) radiators and time-varying graphene for generating harmonic frequencies in the mm-wave spectrum. Graphene is represented as having a dispersive surface conductivity, while time modulation of the conductivity is introduced by varying the applied bias electric field. A modified FDTD algorithm is, additional

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Gao, Feilong, Mingzhe Jiang, and Shaodong Hou. "A Chirped Characteristic-Tunable Terahertz Source for Terahertz Sensing." Sensors 24, no. 16 (2024): 5419. http://dx.doi.org/10.3390/s24165419.

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In broadband terahertz waves generated by femtosecond lasers, spatial chirp will be simultaneously produced with the introduction of angular dispersion. The chirp characteristics of the terahertz wave will directly affect the frequency response, bandwidth response, and intensity response of the terahertz sensor. To enhance the capability of terahertz sensors, it is necessary to control and improve the chirped characteristics of broadband terahertz sources. We generate a chirped terahertz wave via optical rectification in a LiNbO3 prism using the technique of pulse front tilt. The effect of the

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Doria, Andrea, Gian Piero Gallerano, and Emilio Giovenale. "Novel Schemes for Compact FELs in the THz Region." Condensed Matter 4, no. 4 (2019): 90. http://dx.doi.org/10.3390/condmat4040090.

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The rapid advance of terahertz technologies in terms of radiation generators, systems, and scientific or industrial applications has put a particular focus on compact sources with challenging performances in terms of generated power (peak and/or average), radiation time structure, and frequency band tunability. Free electron laser (FEL)-based sources are probably the best candidates to express such a versatility; there are a number of schemes that have been investigated over the years to generate coherent radiation from free electrons in the mm-wave and terahertz regions of the spectrum, cover

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24

Han, Huangpu, Fan Yang, Chenghao Liu, et al. "High-Performance Electro-Optical Mach–Zehnder Modulators in a Silicon Nitride–Lithium Niobate Thin-Film Hybrid Platform." Photonics 9, no. 7 (2022): 500. http://dx.doi.org/10.3390/photonics9070500.

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We analyzed a Mach–Zehnder electro-optical modulator based on a silicon nitride strip–loaded waveguide on 0.5 μm thick x-cut lithium niobate thin film. The optical and radio frequency parameters for two different modulator structures (Type I: packaged with 2 μm thick SiO2 and Type II: unpackaged) were simulated, calculated, and optimized. The Optical parameters included the single-mode conditions, effective indices, the separation distance between the electrode edge and the Si3N4-strip-loaded edge, optical power distribution, bending loss, optical field distribution, and half-wave voltage. The

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Yadav, Rahul, Florian Ludwig, Fahd Rushd Faridi, et al. "GaAs-based antenna-coupled field effect transistors as direct THz detectors across a wide frequency range from 0.2 to 29.8 THz." Optics Express 32, no. 24 (2024): 43407. http://dx.doi.org/10.1364/oe.534393.

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High-power coherent terahertz (THz) radiation from accelerator facilities such as free-electron lasers (FELs) is frequently used in pump-probe experiments where the pump or probe (or both) signals are intense THz pulses. Detectors for these applications have unique requirements that differ from those of low-power table-top systems. In this study, we demonstrate GaAs antenna-coupled field effect transistors (FETs) as a direct THz detector operating across a broad frequency spectrum ranging from 0.2 THz to 29.8 THz. At approximately 0.5 THz, the maximum current responsivity (ℜ I ) of 0.59 mA/W i

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Jin, Xiaofei, Mengwei Jiang, Lu Qian, et al. "Effect of 433 MHz double-slot microwave antennas for double-zone ablation in ex vivo swine liver experiment." PLOS ONE 20, no. 2 (2025): e0315678. https://doi.org/10.1371/journal.pone.0315678.

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Purpose To evaluate the effects of axial length and slot-to-slot distance of double-slot microwave antenna (DSMA) with frequency of 433 MHz on the size and shape of ablation zones created under different input microwave powers. Materials and methods The design of double slot microwave antennas (DSMAs) with axial lengths (70 mm, 30 mm) and slot-to-slot distance (49 mm, 10 mm) were optimized by numerical simulation and ex vivo liver experiments. Finite-element method simulations and forty ablations of swine liver were employed to obtain the temperature distributions within liver tissue using DSM

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27

Yakushev, A. V., and O. Z. Paratsii. "Comparative characteristics of different methods of radiofrequency catheter ablation in atrial flutter." Zaporozhye Medical Journal 24, no. 5 (2022): 516–20. http://dx.doi.org/10.14739/2310-1210.2022.5.259489.

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Catheter ablation occupies the first place in the treatment of atrial macro reentry arrhythmias. The main controllable parameters in ablations are energy, duration of exposure and use of catheter tip cooling. With traditional ablation techniques, there is a high risk of insufficient tissue damage due to electrode instability. Regarding the issue of stability, a new technique was proposed – reducing the application time with increasing the energy. The aim of this work was to compare the results of radiofrequency catheter ablation (RFA) using an 8 mm uncooled electrode to a 4 mm cooled electrode

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Singh, Raj Kumar, Kumari Mamta, and Dhirendra Kumar. "Graphene based nano-antenna for wireless communication systems at terahertz band." Bulletin of Electrical Engineering and Informatics 14, no. 2 (2025): 1045–53. https://doi.org/10.11591/eei.v14i2.8727.

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The need for nano-antennas with decreased size and the capacity to operate at mid-infrared frequencies to enable adequate coverage of signal is being investigated. In this paper, we present graphene-based nano-antenna and analysed at the resonating frequency 33 THz using gallium arsenide material as a substrate having dielectric constant 11.35 and a loss tangent of 5.6×10-4 for terahertz (THz) frequency. The height of substrate is optimized to 108 nm and in-plane dimension being 1,700×1,400 nm. Graphene was used as a rectangular patch with dimension 850×450×5 nm and ground having chemical pote

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Amiegbereta, Edwin Ehis, Ayo Zacchaeus Ibitoye, and Oghenevovwero Emmanuel Esi. "Computational Analysis of a Suitable Antenna and Optimized Frequency for Microwave Ablation of Breast Cancerous Tissue." medtigo Journal of Medicine 2, no. 3 (2024): e13752246. https://doi.org/10.63096/medtigo3062249.

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The study was aimed to simulate and analyze a suitable antenna operating at an optimized frequency for microwave ablation of breast cancerous tissue. Four different antennas were simulated and analyzed using finite element method (FEM) software. Based on the variation in their reflection coefficient, total power density, and Specific Absorption Ratio, three of the antennas were selected. The four antennas have different geometry parameters based on the effective wavelength in breast tissue at the variable frequencies. Power loss for all simulated microwave antennas were above 50 % from an inpu

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DING, YUJIE J., and WEI SHI. "PROGRESS ON WIDELY-TUNABLE MONOCHROMATIC THz SOURCES AND ROOM-TEMPERATURE DETECTIONS OF THz WAVES." Journal of Nonlinear Optical Physics & Materials 15, no. 01 (2006): 89–111. http://dx.doi.org/10.1142/s0218863506003116.

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We have further developed widely-tunable monochromatic THz sources. These sources are based on difference-frequency generation (DFG) in GaSe and GaP crystals. Using a 47 mm long GaSe crystal the output wavelength was tuned in the range from 66.5 to 5664 μm (from 150 to 1.77 cm-1) with the peak powers reaching 389 W. This record-high power corresponds to a conversion efficiency of ~0.1%. On the other hand, using a 20 mm long GaP crystal the output wavelength was tuned in the range 71.1–2830 μm whereas the highest peak power was 15.6 W. The advantage of using GaP over GaSe is obvious: crystal ro

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Fadare, Oluwole, Lihui Qin, Maritza Martel, and Fattaneh A. Tavassoli. "Pathology of the NovaSure (Radio-Frequency) Impedance-Controlled Endometrial Ablation System." Archives of Pathology & Laboratory Medicine 129, no. 9 (2005): 1175–78. http://dx.doi.org/10.5858/2005-129-1175-potnri.

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Abstract The widespread use of increasingly novel diagnostic and neoadjuvant therapeutic modalities necessitates that contemporary pathologists familiarize themselves with the spectrum of tissue derangements that may be seen in the eventual surgical specimens. In the management of endometrial lesions, for example, a variety of endometrial ablation technologies, such as cryosurgery, balloon therapy, microwave, hot circulating saline, and bipolar impedance technology, have been introduced in the past decade and are being utilized with increasing frequency. We describe herein pathologic changes a

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Darwish, Ali M., H. Alfred Hung, Joe Qiu, Amr Ibraheem, and Edward Viveiros. "Broadband 1-to-N Circuit Combiner for mm-wave Applications." International Symposium on Microelectronics 2015, no. 1 (2015): 000776–80. http://dx.doi.org/10.4071/isom-2015-thp13.

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Packaging mm-wave and THz circuits, poses many challenges due to the sensitivity of the circuits to any mismatch at the input or output. Traditional interfaces for combining circuits produce significant losses, and standing waves. This paper presents a unique approach to combing circuits at high frequency that results in reflection cancellation, and significant isolation between the circuits. The novel ‘iπ-wave’ approach relies on introducing a set of resistors and 180/N delay lines; where N is the number of circuits to be combined. The approach enables combing 1-to-N circuits with low loss du

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Butt, Usman Mahmood, Imran Saleem, Hafiz Abdul Mannan Shahid, Waqar Hassan, Muhammad Ashraf Dar, and Zubair Akram. "Evaluation of the Quantity and Duration of Junctional Rhythm during Successful Radiofrequency Ablation among Patients with Atrioventricular Nodal Re-Entry Tachycardia." Pakistan Heart Journal 56, no. 1 (2023): 56–60. http://dx.doi.org/10.47144/phj.v56i1.2368.

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Objectives: To evaluate the quantity and duration of junctional rhythm during radiofrequency ablation among atrioventricular nodal reentry tachycardia (AVRNT) patients. Methodology: A Cross sectional study was conducted at Punjab Institute of cardiology from May – July, 2022. Ablations of slow pathway were executed on 50 patients who fulfilled the inclusion criteria using ablation catheters of 4-mm tip. Power output was kept between 35- 40 Watt with a temperature control at 60 °C depending upon the occurrence of junctional rhythm. The target end points of radio frequency ablation (RFA) were in

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Guan, Wen, Ziping Li, Kang Zhou, et al. "Repetition frequency locking of a terahertz quantum cascade laser emitting at 4.2 THz." Terahertz Science and Technology 13, no. 1 (2020): 32–40. http://dx.doi.org/10.1051/tst/2020131032.

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The electrically-pumped terahertz quantum cascade laser (QCL) is characterized by high power emission, compact, broad frequency coverage, and so on, which shows abilities for frequency comb operations. Although free-running QCLs can work as frequency combs by designing the laser structure with small group velocity dispersions and/or inserting mirrors to compensate laser intrinsic dispersions, the ideal comb operation can only be obtained by firmly locking the repetition frequency and carrier frequency of a laser. In this work, we have reported a repetition frequency locking of a terahertz QCL

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Youssef, Amraoui, Imane Halkhams, Rachid El Alami, Mohammed Ouazzani Jamil, and Hassan Qjidaa. "A novel slotted antenna design for future Terahertz applications." International Journal of Electrical and Computer Engineering (IJECE) 14, no. 3 (2024): 2708. http://dx.doi.org/10.11591/ijece.v14i3.pp2708-2716.

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A slotted patch antenna operating at 118 GHz is proposed to address challenges in the terahertz (THz) frequency band for wireless communication systems. The antenna design, utilizing a Rogers RO3003 substrate, which has a dielectric constant of 3 and tan 0.001, strategically incorporates slots to enhance key performance parameters. Copper is employed for the ground and radiating patch, and a microstrip feeding method powers the antenna. High frequency structure simulator (HFSS) software is used for design and simulation, revealing resonance at 0.118 THz with a reflection coefficient of -42.41

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Calvo-Gallego, Jaime, Juan A. Delgado-Notario, Jesús E. Velázquez-Pérez, et al. "Numerical Study of the Coupling of Sub-Terahertz Radiation to n-Channel Strained-Silicon MODFETs." Sensors 21, no. 3 (2021): 688. http://dx.doi.org/10.3390/s21030688.

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This paper reports on a study of the response of a T-gate strained-Si MODFETs (modulation-doped field-effect transistor) under continuous-wave sub-THz excitation. The sub-THz response was measured using a two-tones solid-state source at 0.15 and 0.30 THz. The device response in the photovoltaic mode was non-resonant, in agreement with the Dyakonov and Shur model for plasma waves detectors. The maximum of the photoresponse was clearly higher under THz illumination at 0.15 THz than at 0.3 THz. A numerical study was conducted using three-dimensional (3D) electromagnetic simulations to delve into

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Mancia, Lauren, Eli Vlaisavljevich, Nyousha Yousefi, et al. "Focused ultrasound ablation of solid tumors: Feasibility of planning tissue-selective treatments." Journal of Clinical Oncology 38, no. 15_suppl (2020): e15600-e15600. http://dx.doi.org/10.1200/jco.2020.38.15_suppl.e15600.

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e15600 Background: Focused ultrasound (FUS) is a noninvasive, nonionizing, repeatable local ablative therapy that induces mechanical fractionation or thermal necrosis of a variety of solid tumors including hepatocellular carcinoma, prostate cancer, and desmoid fibromatosis. Recent feasibility studies in animal models have demonstrated the possibility of designing focused ultrasound treatments that are selective (e.g. spare healthy tissue, nerves, and blood vessels) due to differences in tissue and tumor mechanical properties. Given wide variation in individual tumor and patient characteristics

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Amraoui, Youssef, Halkhams Imane, El Alam Rachid, Ouazzani Jami Mohammed, and Qjidaa Hassan. "A novel slotted antenna design for future Terahertz applications." International Journal of Electrical and Computer Engineering (IJECE) 14, no. 3 (2024): 2708–16. https://doi.org/10.11591/ijece.v14i3.pp2708-2716.

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A slotted patch antenna operating at 118 GHz is proposed to address challenges in the terahertz (THz) frequency band for wireless communication systems. The antenna design, utilizing a Rogers RO3003 substrate, which has a dielectric constant of 𝜀𝑟 = 3 and tan 𝛿 = 0.001, strategically incorporates slots to enhance key performance parameters. Copper is employed for the ground and radiating patch, and a microstrip feeding method powers the antenna. High frequency structure simulator (HFSS) software is used for design and simulation, revealing resonance at 0

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Sun, Mingyang, Guimin Xu, and Guanjun Zhang. "Low temperature plasma ablation device for minimally invasive surgery." Review of Scientific Instruments 94, no. 1 (2023): 014101. http://dx.doi.org/10.1063/5.0101701.

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This study introduces the design principle of a high-frequency square wave power supply, as well as the simulation and design process of a minimally invasive electrosurgical scalpel, which formed the low temperature plasma in saline solution. In order to verify the performance of the device, saline discharge experiments and pork ablation experiments were performed. An alternating high-frequency square-wave voltage was applied between coaxial double-layer electrodes with a spacing of 400 µm. The waveforms and amplitude of output voltage and current, conductance between electrodes, and output po

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Bystrov, Aleksandr, Liam Daniel, Edward Hoare, Fatemeh Norouzian, Mikhail Cherniakov, and Marina Gashinova. "Experimental Evaluation of 79 and 300 GHz Radar Performance in Fire Environments." Sensors 21, no. 2 (2021): 439. http://dx.doi.org/10.3390/s21020439.

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This paper presents an experimental study of the propagation of mm-wave/low-THz signals in the frequency ranges of 79 and 300 GHz through fire. Radar performance was investigated in various real scenarios, including fire with strong flame, dense smoke and water vapour. A stereo video camera and a LIDAR were used as a comparison with other common types of sensors. The ability of radars to enable the visibility of objects in fire environments was proven. In all scenarios, the radar signal attenuation was measured, and in the case of steam was compared with theoretical calculations. The analysis

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Bystrov, Aleksandr, Liam Daniel, Edward Hoare, Fatemeh Norouzian, Mikhail Cherniakov, and Marina Gashinova. "Experimental Evaluation of 79 and 300 GHz Radar Performance in Fire Environments." Sensors 21, no. 2 (2021): 439. http://dx.doi.org/10.3390/s21020439.

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This paper presents an experimental study of the propagation of mm-wave/low-THz signals in the frequency ranges of 79 and 300 GHz through fire. Radar performance was investigated in various real scenarios, including fire with strong flame, dense smoke and water vapour. A stereo video camera and a LIDAR were used as a comparison with other common types of sensors. The ability of radars to enable the visibility of objects in fire environments was proven. In all scenarios, the radar signal attenuation was measured, and in the case of steam was compared with theoretical calculations. The analysis

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Khan, Aafreen, Anwar Ahmad, and Maksud Alam. "High Gain Metamaterial Implemented Antenna Design with Circular Polarization for mm-Wave 5G and 6G Sub-THz Communication." December 2023 5, no. 4 (2023): 423–41. http://dx.doi.org/10.36548/jei.2023.4.005.

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A high-gain metamaterial-enabled circularly polarized antenna has been proposed. Two patch structures patch A and patch B have been designed by using different shape slots. After slot etching on the patch, two different metamaterial techniques were used. Circular metamaterial (MTM) was implemented for Patch A, while rectangular MTM was used for Patch B. The implementation of MTM resulted in increased antenna gain, as well as improvements in impedance bandwidth RL and AR. So, in the proposed article two antenna structures ANT-A and ANT-B, are presented. The maximum gain achieved for ANT-A is 34

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Rouane, Amar, and Paul Bru. "High frequency metrology for intracardiac ablation: in-vivo results." Metrology and Measurement Systems 19, no. 3 (2012): 603–10. http://dx.doi.org/10.2478/v10178-012-0053-4.

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Abstract Cardiac Radiofrequency (RF) ablation is a commonly used clinical procedure for treating many cardiac arrhythmias. However, the efficacy of RF ablation may be limited by two factors: small ventricular lesions and impedance rise, leading to coagulum formation and desiccation of tissue. In this paper, a high frequency (HF) energy ablation system operating at 27.12 MHz based on an automated load matching system was developed. A HF energy matched probe associated to the automated impedance matching device ensures optimal transfer of the energy to the load. The aim of this study was to eval

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Wang, Mingxu, Yanyi Wang, Weiping Li, et al. "Reflection Characteristics Measurements of Indoor Wireless Link in D-Band." Sensors 22, no. 18 (2022): 6908. http://dx.doi.org/10.3390/s22186908.

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For the millimeter wave (mm-Wave) and terahertz (THz) indoor wireless communication system, the reflection channels need to be characterized and modeled. In this paper, the reflection measurements of the parallel polarized wave are carried out under multiple incident angles and five kinds of materials in the D-band (110–170 GHz). A modified reflection model with two parameters estimated by the minimum mean square error (MMSE) criterion is proposed. The results show that the measurements are in good agreement with the proposed model. Furthermore, a set of measured properties is demonstrated and

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Criado, A. R., C. de Dios, P. Acedo, G. Carpintero, and K. Yvind. "Comparison of Monolithic Optical Frequency Comb Generators Based on Passively Mode-Locked Lasers for Continuous Wave mm-Wave and Sub-THz Generation." Journal of Lightwave Technology 30, no. 19 (2012): 3133–41. http://dx.doi.org/10.1109/jlt.2012.2211998.

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Sun, Haifeng, Diego Marti, Stefano Tirelli, Andreas R. Alt, Hansruedi Benedickter, and C. R. Bolognesi. "Millimeter-wave GaN-based HEMT development at ETH-Zürich." International Journal of Microwave and Wireless Technologies 2, no. 1 (2010): 33–38. http://dx.doi.org/10.1017/s1759078710000164.

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We review the AlGaN/GaN high electron mobility transistor (HEMT) activities in the Millimeter-Wave Electronics Group at ETH-Zürich. Our group's main thrust in the AlGaN/GaN arena is the extension of device bandwidth to higher frequency bands. We demonstrated surprising performances for AlGaN/GaN HEMTs grown on high-resistivity (HR) silicon (111) substrates, and extended cutoff frequencies of 100 nm gate devices well into the millimeter (mm)-wave domain. Our results narrow the performance gap between GaN-on-SiC (or sapphire) and GaN-on-silicon and establish GaN-on-Si as a viable technology for

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RODWELL, M. J. W., M. URTEAGA, Y. BETSER, et al. "SCALING OF InGaAs/InAlAsHBTs FOR HIGH SPEED MIXED-SIGNAL AND mm-WAVE ICs." International Journal of High Speed Electronics and Systems 11, no. 01 (2001): 159–215. http://dx.doi.org/10.1142/s0129156401000824.

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High bandwidths are obtained with heterojunction bipolar transistors by thinning the base and collector layers, increasing emitter current density, decreasing emitter contact resistivity, and reducing the emitter and collector junction widths. In mesa HBTs, minimum dimensions required for the base contact impose a minimum width for the collector junction, frustrating device scaling. Narrow collector junctions can be obtained by using substrate transfer processes, or -if contact resistivity is greatly reduced -by reducing the width of the base Ohmic contacts in a mesa structure. HBTs with submi

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Yuan, Jiasheng, Quanxin Guo, Xingyu Zhang, et al. "Large Dynamic Range Spectral Measurement in Terahertz Region Based on Frequency Up-Conversion Detection via OH1 Crystal." Sensors 24, no. 19 (2024): 6245. http://dx.doi.org/10.3390/s24196245.

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Terahertz spectroscopy systems, which integrate terahertz sources and detectors, have important applications in many fields such as materials science and security checking. Based on highly sensitive frequency up-conversion detection, large dynamic range spectral measurements in a terahertz region are reported. Our system realized the detection sensitivity at a 10 aJ level with a 2-(3-(4-hydroxystyryl)-5,5-dime-thylcyclohex-2-enylidene) malononitrile (OH1) crystal and a dynamic range up to seven orders. Based on this system, we verified the validity of the spectral measurement with tests which

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Huang, Wenchang, Jiaqi Li, Shuai Wu, et al. "Dual-Frequency Impedance Matching Network Design Using Genetic Algorithm for Power Ultrasound Transducer." Micromachines 15, no. 3 (2024): 344. http://dx.doi.org/10.3390/mi15030344.

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Dual-frequency ultrasounds have demonstrated significant potential in augmenting thermal ablation efficiency for tumor treatment. Ensuring proper impedance matching between the dual-frequency transducer and the power amplifier system is imperative for equipment safety. This paper introduces a novel dual-frequency impedance matching network utilizing L-shaped topology and employing a genetic algorithm to compute component values. Implementation involved an adjustable capacitor and inductor network to achieve dual-frequency matching. Subsequently, the acoustic parameters of the dual-frequency HI

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Dong, Ruibing, Yiheng Song, and Yang Xing. "A 110 GHz Feedback Amplifier Design Based on Quasi-Linear Analysis." Electronics 12, no. 17 (2023): 3725. http://dx.doi.org/10.3390/electronics12173725.

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The power gain and output power of millimeter-wave (mm-Wave) and terahertz (THz) amplifiers are critical performance metrics, particularly when the operating frequencies of amplifiers are near to the maximum oscillator frequency (fmax) of the transistor. This paper presents the design of a 110 GHz amplifier based on the quasi-linear method. The power gain can be boosted to maximum achievable gain (Gmax) using a linear, lossless, reciprocal feedback network, though this leads to a simultaneous decrease in output power. Based on quasi-linear analysis, for an amplifier with Gmax gain, when the K-

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