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All Journal International Journal of Electrical and Computer Engineering Scan : Jurnal Teknologi Informasi dan Komunikasi Jurnal Teknologi Terapan Journal of Engineering and Scientific Research (JESR) Abdimasku : Jurnal Pengabdian Masyarakat Jurnal Pengabdian kepada Masyarakat Nusantara Journal of Computer and Information Systems Ampera Journal of Computer, Electronic, and Telecommunication (COMPLETE) Jurnal Jaring SainTek Jumat Keagamaan: Jurnal Pengabdian Masyarakat AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Abdi Wina : Jurnal Pengabdian Kepada Masyarakat Universitas Kristen Wira Wacana Sumba Frontiers in Community Service and Empowerment Jurnal Cakrawala Maritim Jurnal Teknologi Maritim JIPFRI (Jurnal Inovasi Pendidikan Fisika dan Riset Ilmiah) International Conference on Maritime Technology and Its Application Faraday: Journal of Fundamental Physics, Research, and Applied Science
Ni’matut Tamimah
Politeknik Perkapalan Negeri Surabaya
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Rekonfigurasi Antena Folded Dipole Mikrostrip Berbasis Laser Merah dan Microwave Multifunctional Analyzer (MMA) Aslam Chitami Priawan Siregar; Yono Hadi Pramono; Gatut Yudoyono; Ni’matut Tamimah
JIPFRI (Jurnal Inovasi Pendidikan Fisika dan Riset Ilmiah) Vol. 9 No. 2 (2025): November Edition
Publisher : Universitas Nurul Huda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30599/jipfri.v9i2.4745

Abstract

With the increasing use of communication devices across various regions, antennas with stable signal performance are essential to ensure reliable information transmission. In this study, a microstrip folded-dipole antenna operating in the SHF band was developed using a reconfiguration mechanism based on a 650-nm red laser and metamaterial absorber (MMA). The initial antenna structure was designed and simulated in CST software with a target operating frequency of 9 GHz. Experimental results show that the antenna without a resonator exhibits an operating frequency of 13.77 GHz when the laser is off and 3.15 GHz when the laser is on. When integrated with the resonator, the operating frequencies shift closer to the simulation results, ranging from 15.75 GHz (laser off) to 7.02 GHz (laser on). The return-loss performance also improves with the implementation of the resonator. Without the resonator, the antenna achieves −33 dB return loss in laser-off mode and −34.15 dB in laser-on mode. With the resonator, the return loss values are −21.88 dB (laser off) and −26.61 dB (laser on). These findings indicate that the proposed configuration technique is applicable for outdoor Wi-Fi signal enhancement in the 5 GHz band and as a blind-spot sensing element for automotive radar systems.
Impact of Copper (Cu) and Lead (Pb) Conductive Materials on the Radiation Performance of Printed Circuit Dipole Antennas A. C. P. Siregar; A. D. Ardiyanti; A. R. Hilmi; Y. E. Setiawan; N. Tamimah; E. A. Saputro; Purnomo; A. H. R. Inaku
Journal of Engineering and Scientific Research Vol. 8 No. 1 (2026)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v8i1.239

Abstract

The Effect of Increasing Catalyst Concentration of Fabricated Hydrogen Generator on Proton Exchange Membrane Fuel Cell Performance M Anis Mustaghfirin; Mardi Santoso; M Hakam; Rafi Akbar Heriyansyah; Aminatus Sa’diyah; Eky Novianarenti; Ni’matut Tamimah; Haidhar Wahyu S
International Conference on Maritime Technology and Its Application Vol. 3 No. 1 (2024): ICOMTA : International Conference on Maritime Technology and Its Application
Publisher : Surabaya State Polytechnic of Shipbuilding

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35991/icomta.v1i1.9

Abstract

Hydrogen can be utilised through a Proton Exchange Membrane Fuel Cell (PEMFC) which has many advantages, namely more energy yield, higher energy density, no emissions, and no need for recharging compared to using batteries. The highest electrolyzer efficiency results were found on the 0.05M KOH catalyst with a value of 1.70% and it can be concluded that the higher the catalyst concentration, the higher the electrolyzer efficiency. The highest power density and fuel cell efficiency quality is found in the 0.05M NaCl catalyst but with the lowest Specific Fuel Consumption (SFC) of 0.62 kg/kWh, this indicates that the relationship between concentration and power density and fuel cell efficiency is directly proportional while it is inversely proportional to Specific Fuel Consumption ( SFC). The best Break Even Ratio value is found in the NaCl catalyst type 0.05 with a value of 0.082. The use of a seawater catalyst has the highest efficient value at a percentage of 100% with electrolyzer efficiency reaching 13.36% and the lowest SFC, namely 0.24 kg/kWh. Based on these results, the use of hydrogen generators for Proton Exchange Membrane Fuel Cells (PEMFC) needs to be developed.
Co-Authors A. D. Ardiyanti A. H. R. Inaku A. R. Hilmi Adi Wirawan Husodo Ahmad, Mahasin Maulana Alam, Hafiz Akbar Aminatus Sa’diyah Aminatus Sa’diyah Andika Aldo Pratama Anggara Trisna Nugraha Anifatul Faricha Aprilia Dewi Ardiyanti Aslam Chitami Priawan Siregar Asri, Purwidi Budi Prasojo, Budi Budianto, Ekky Nur Budiyanto, Ekky Nur Chatarina Umbul Wahyuni Devina Puspita Sari Dianita Wardani Diego Ilham Yoga Agna E. A. Saputro Edy Setiawan Eko Julianto Eky Novianarenti Eky Novianarenti Endro, Dimas Fajar Rahmat Adzani Faris Riyadi Galih Anindita Gatut Yudoyono H, Fitri Haidhar Wahyu S Hakam, M Heriyansyah, Rafi Akbar Ii Munadhif Ika Erawati Indasyah, Enny Laili Agustin Widyaningrum Luluk Kusminah, Imah Luluk, Imah M Anis Mustaghfirin M Hakam Mahardhika, Pekik Mardi Santoso Mardi Santoso Muhammad Achirul Nanda Muhammad Bilhaq Ashlah Muhammad Falahudin Malich Salaz Muhammad Izzul Haj Mukhammad Jamaludin Mustaghfirin, M Anis Naufal, Muhammad Ellang Ponti Almas Karamina Purnomo Puspita Sari, Devina Qurrotun 'Ayun Mawadatur Rohmah Rafi Akbar Heriyansyah Rahmania Firdiansyah Rina Sandora Robin Addwiyansyah Alvaro Samrat Rozan, Hafiz Salsabila Ika Yuniza Sa’diyah, Aminatus Siti Maghfirotul Ulyah Suci Indaryani Syafiuddin Tarikh Azis Ramadani Ulfah Abqari Wismawati, Endah Witjonarko, R. Dimas Endro Y. E. Setiawan Yono Hadi Pramono