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All Journal Komunikasi Fisika Indonesia Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Journal of Aceh Physics Society Spektra: Jurnal Fisika dan Aplikasinya Unri Conference Series: Community Engagement PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Science, Technology, and Communication Journal Journal of Engineering and Technological Sciences
Rini, Ari Sulistyo
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Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Physics Other

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Argon plasma ionization in thermodynamic equilibrium with continuity equation Anshori Kasri; Saktioto Saktioto; Rakhmawati Farma; Ari Sulistyo Rini; Erwin Erwin; Awitdrus Awitdrus
Science, Technology, and Communication Journal Vol. 5 No. 3 (2025): SINTECHCOM Journal (June 2025)
Publisher : Lembaga Studi Pendidikan dan Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v5i3.318

Abstract

Local thermodynamic equilibrium is a foundational concept in plasma physics and heat transfer, describing a state where each small region of a system can be treated as if it is in thermodynamic equilibrium, even if the whole system is not. However, achieving accurately perfect thermodynamic equilibrium conditions in real-experiments is often challenging. It often struggles for understanding phenomena like excited states or specific Arrhenius-driven reactions. As a result, the advantages of plasma modeling with simplifications can sometimes overshadow the disadvantages of experiments. This study simulated the ionization process of argon plasma using the 4th order Runge-Kutta numerical method. The simulation, initiated with initial densities before the simulation is run, each of them is electrons 2.6 × 1018 m-3, neutral argon (Ar) 2.6 × 1018 m-3, positive argon ions (Ar+) 2.6 × 1018 m-3, and positive diatomic argon ions (Ar2+) 2.6 × 1018 m-3, successfully obtained reaction rate equilibrium data at the 625th iteration. The final densities observed were 2.46 × 1018 m-3 for electrons, 2.27 × 1018 m-3 for neutral argon, 6.4 × 1015 m-3 for Ar+, and 4.34 × 1017 m-3 for Ar2+. These results show the equilibrium reaction rate in argon plasma which provides information that density of electron and Ar+ species show a decreasing trend while density of Ar and Ar2+ species shows an increasing trend which are the result of ionization and recombination processes in the entire plasma system.
Design and optimization of square SRR metamaterial-based microstrip antenna for wideband biomedical sensing Saktioto Saktioto; Cici Yana Tasya Angraini; Yan Soerbakti; Ari Sulistyo Rini; Syamsudhuha Syamsudhuha; Sofia Anita
Science, Technology, and Communication Journal Vol. 6 No. 1 (2025): SINTECHCOM Journal (October 2025)
Publisher : Lembaga Studi Pendidikan dan Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v6i1.331

Abstract

The continuous advancement in wireless biomedical technology necessitates the development of compact, high-performance antennas capable of operating across a wide frequency range. In this context, this study reports the design and optimization of a square split-ring resonator (SRR) metamaterial-based microstrip antenna to enhance bandwidth and gain characteristics for wideband biomedical sensing. The proposed metamaterial, composed of one to four square SRR unit cells, was modeled using copper patches on an FR-4 substrate with a dielectric constant of 4.3 and simulated in CST Studio Suite 2019 over a frequency range of 0.009 – 9 GHz. The electromagnetic behavior of the structure was analyzed through S-parameter characterization, and the Nicolson–Ross–Weir (NRW) retrieval method was applied to extract the effective constitutive parameters, including relative permittivity, relative permeability, and refractive index. The optimized four-cell SRR configuration demonstrated double-negative (DNG) characteristics, exhibiting a relative permittivity of -153.65, a relative permeability of -8.85, and a refractive index of -9.48, thereby confirming the negative-index properties essential for enhanced electromagnetic field confinement and energy concentration. Integration of the optimized metamaterial into the microstrip antenna structure yielded significant performance improvement, achieving a return loss of -48.31 dB, bandwidth of 4.37 GHz, and gain of 2.23 dBi. These results substantiate that the square SRR metamaterial contributes to superior impedance matching and field localization, making the proposed antenna architecture highly promising for wideband biomedical sensing and potential internet of things (IoT) healthcare implementations.
Co-Authors Akrajas Ali Umar Akrajas Ali Umar Anggrid Fitrisia Anita, Sofia Anshori Kasri Apriyani, Irma Arie Purnomo Aji Arisman Adnan Awitdrus Awitdrus, Awitdrus Azwat, Luqyana Adha Budi Astuti Cici Yana Tasya Angraini Defrianto Defrianto Ebigail Nur Tabita Tambunan Erman Taer Erwin Erwin Eva Wahyuni Harahap Farhan Lutfi Hazelina Adzani Herna Herna Ilham Yurestira Iwantono Iwan Barnawi Juandi Muhammad Krisman Krisman Lazuardi Umar Lazuardi Umar Maria Erna Maya Sari Mediniah Putri Simatupang Miranti Agustin Mohamad Deraman, Mohamad Mohd. Ambar Yarmo Muhammad Deri Noferdi Muhammad Feri Desfri Nurhayati, Nurhayati Ody Azis Saputra Putri, Hardini Chania Rabiah Rabiah Rahmi Dewi Rahmi Dewi Rahmondia N. Setiadi Rahmondia Nanda Setiadi Rakhmawati Farma Rakhmawati Farma Rati, Yolanda Riska Fitriani Rita Meldayani Saktioto Saktioto Saktioto Saktioto Saktioto, Saktioto Santi T Sidabukke Shahidan Radiman Soerbakti, Yan Sofia Anita Sundami Restiana Syamsudhuha Syamsudhuha Syamsudhuha Syamsudhuha Tengku Emrinaldi Tengku Emrinaldi Tengku Said Hussain Shahab Tetty Marta Linda Vepy Asyana Yan Soerbakti Yan Soerbakti Yanuar Hamzah Yanuar Hamzah Yessi Meinarti Yolanda Rati