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All Journal IAES International Journal of Artificial Intelligence (IJ-AI) Bulletin of Electrical Engineering and Informatics Jurnal Ilmiah Teknik Elektro Komputer dan Informatika (JITEKI) ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Jurnal Penelitian Pendidikan IPA (JPPIPA) Indonesian Journal of Electrical Engineering and Computer Science Makara Journal of Technology International Journal of Electrical, Computer, and Biomedical Engineering (IJECBE) Buletin Pos dan Telekomunikasi
Fitri Yuli Zulkifli
Universitas Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics Social Sciences

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IoT-Based Vehicle Monitoring System on LoRa Network: Addressing Community Needs in Indonesia Zulkifli, Fitri Yuli; Halimsurya, Ervin; Ayyasy, Muhammad; Luthfi, Fitya; Alinursafa, Ibnu
International Journal of Electrical, Computer, and Biomedical Engineering Vol. 2 No. 2 (2024)
Publisher : Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62146/ijecbe.v2i2.46

Abstract

Our innovative IoT-based vehicle monitoring system emerges from a comprehensive survey among vehicle owners. The device circuit is designed using ESP32, GPS to detect location and speed, MPU6050 to detect vibrations from the vehicle engine, and a relay that is used to disconnect the vehicle socket if needed. The data collected from each component is sent through the LoRa Antares network. Access to the data can be done using a cell phone through the MOTRAV application that has been integrated with the Antares server. The designed system is able to display the location, speed, and condition of the vehicle consistently with an average delay of 7 seconds and can receive 65% of the control signals to start and stop the vehicle engine. The system can also send a warning notification if the vehicle that is not being used is detected at a speed of more than 5.5 km/h with engine vibrations detected reaching 28 vibrations/5 seconds.
Peningkatan Bandwidth dan Gain Antena Mikrostrip Leaky Wave dengan Multi Slot untuk Aplikasi WLAN IQBAL, MUHAMAD WAHYU; ZULKIFLI, FITRI YULI; RAHARDJO, EKO TJIPTO
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 10, No 2: Published April 2022
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v10i2.432

Abstract

ABSTRAKPenelitian ini menggunakan antena microstrip leaky wave dengan menambahkan dua slot, yaitu E-slot dan U-slot ganda atau multislot pada frekuensi 6 GHz (5,925 GHz-6,425 GHz) untuk aplikasi WLAN. E-slot dan U-slot ganda digunakan untuk meningkatkan performa dari gain dan bandwidth. Hasil dari simulasi memberikan informasi antena mikrostrip leaky wave dengan penambahan E-slot dan U-slot atau multislot diperoleh hasil s-parameter memiliki nilai -23,196 dB, VSWR sebesar 1,164, bandwidth sebesar 615 MHz, dan gain sebesar 6,16 dBi. Hasil simulasi dari antena mikrostrip leaky wave dengan penambahan E-slot dan U-slot ganda atau multislot menunjukkan dapat meningkatkan bandwidth sebesar 130,038 % dan meningkatkan gain sebesar 34,15 % dibandingkan dengan antena leaky wave tanpa penambahan E-slot dan U-slot ganda.Kata kunci: Mikrostrip Leaky Wave, Multislot, Bandwidth, Gain ABSTRACTIn this study used microstrip leaky-wave antenna by adding, E-slot and double U-slot or multi-slot at frequency of 6 GHz (5,925 GHz – 6,425) for WLAN applications. E-slot and double U-slot are used to increase performance of the gain and bandwidth. The simulation result from provide microstrip leaky-wave antenna with the addition E-slot and double U-slot obatained s-parameter of - 23,196 dB, VSWR of 1,164, bandwidth of 615 MHz, and gain of 6,16 dBi. Simulation results from microstrip leaky-wave antenna with the addition E-slot and double U-slot show that can increase bandwidth by 130,038 % and increase gain by 34,15 % compared to microstrip leaky-wave without the addition E-slot and double U-slot.Keywords: Microstrip Leaky Wave, Multislot, Bandwidth, Gain
Techno-Economic Analysis of Investment in Specific Absorption Rate Test System at Telecommunication Equipment Testing Laboratories in Indonesia Muhammad Ikhwan; FItri Yuli Zulkifli
Buletin Pos dan Telekomunikasi Vol. 22 No. 2 (2024): December 2024
Publisher : Centre for Research and Development on Resources, Equipment, and Operations of Posts and I

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17933/bpostel.v22i2.389

Abstract

The use of mobile devices has become a primary necessity for the Indonesian society. The benefits of mobile devices are increasingly abundant. However, it is essential to consider the impact of electromagnetic exposure on health. Recently, government regulate Specific Absorption Rate (SAR) limits for mobile phones and computer tablets. The government strives to ensure that devices circulating in Indonesia comply with these SAR limits. Unfortunately, the number of laboratories in Indonesia capable of testing SAR is quite limited. This situation presents a business opportunity for telecommunications testing laboratories to invest in SAR testing systems. The author analyzes the techno-economic aspects of investing in SAR system tests using parameters such as Net Present Value (NPV), Internal Rate of Return (IRR), and Payback Period (PP). Two options are compared: the first involves investing in two complete SAR measurement systems, while the second entails investing in one measurement system with a backup probe. Both options allow for full operation of the SAR testing system, enabling consumers to request testing whenever needed. The calculations reveal that both options yield an NPV greater than zero, an IRR exceeding the specified interest rate, and the ability to recoup the investment within a six-year payback period. Consequently, this investment is deemed viable for implementation at present with current condition.
Development of frequency modulated continuous wave radar antenna to detect palm fruit ripeness Rahmawati, Yosy; Rizkinia, Mia; Zulkifli, Fitri Yuli
Bulletin of Electrical Engineering and Informatics Vol 14, No 3: June 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v14i3.8749

Abstract

Oil palm fruits farmers in Indonesia have determined the ripeness of oil palm fruits in the traditional way, namely using human eye visuals, which have the weakness of inconsistent levels of accuracy and are prone to errors. The development of increasingly sophisticated technology will help oil palm fruits farmers recognize the characteristics of fruit maturity. Advanced technology, such as frequency modulated continuous wave (FMCW) radar, can assist farmers in accurately identifying fruit maturity. To ensure high accuracy and sensitivity, an antenna with low side lobe level (SLL), high gain, and wide bandwidth in the 23-26 GHz range is required. Using CST Microwave Studio 2023, a designed and simulated antenna achieved an SLL of 24 dB, a gain of 15 dBi, and a bandwidth of 2.5 GHz. These results indicate that higher gain enhances energy directionality and overall antenna performance. Additionally, a smaller angular value improves the antenna’s radiation focus, making it more effective for precision sensing in oil palm fruit ripeness detection.
The Relaying Network in Free-Space Optical Communications using Optical Amplifiers in Cascaded Configuration Darusalam, Ucuk; Raj, Arockia Bazil; Zulkifli, Fitri Yuli; Priambodo, Purnomo Sidi; Rahardjo, Eko Tjipto
Makara Journal of Technology Vol. 27, No. 2
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Optical relaying is the best technique to implement free-space optical (FSO) communications as a terrestrial platform. However, atmospheric turbulence (AT) limits the optical-propagation path length. In this study, the implementation of some optical amplifiers (OAs) in cascaded configuration, namely, erbium-doped fiber amplifiers, semiconductor OAs, and Raman amplifiers (RAs), are investigated through simulation. This study aims to search for the maximum link distance of an optical propagation and enhance the FSO performance caused by each configuration of OAs. The optical relaying network consists of three nodes, with each node designed with a space of several kilometers under the influence of AT. At the end of the destination, before the receiver, an optical band-pass filter is applied to perform noise filtering. Among the OAs in the cascaded configuration, the RA can expand the link distance of the optical-propagation path length to a range of 14.7–15.9 Km under the influence of a strong AT. The signal-to-noise ratio and bit error rate of the system are in the ranges of 24.1– 19.08 dB and 7.9 × 10−15–7.4 × 10−6, respectively.
Terahertz Imaging Simulation Using Silicon-based Microstrip Antenna and Horn Antenna for Breast Cancer Detection Herry Tony Andhyka; Catur Apriono; Fitri Yuli Zulkifli
Jurnal Ilmiah Teknik Elektro Komputer dan Informatika Vol. 8 No. 4 (2022): Desember
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/jiteki.v8i4.24809

Abstract

Breast cancer is one of the most common cancers in the world that cause a lot of mortality. Early cancer detection is crucial to decrease morbidity and mortality rates worldwide. Effective treatment or early intervention is crucial before the disease becomes more incurable. This research contributes to proposing a THz imaging system for early cancer detection, especially breast cancer, by using the benefit of THz radiation. Some approaches are made differently from the previous research, such as the imaging method, the antenna type, and the material for the antenna with the expectation of producing an efficient system and better imaging results. The system consists of one microstrip antenna as a transmitter, 25 horn antenna as a receiver and a breast tissue model. All antenna is designed to meet the requirement specification. The receiver antenna will receive power from the transmitter which will vary due to the absorption of the breast model. The received power will be visualized into a 2D color image. The simulation was able to visualize an image of the breast tissue model. Received power varies from -16.280 dB to -55.241 dB which leads to different color levels to represent the model. Antenna radiation patterns also take a role to cause the phenomenon occurred that leads to differentiation of the breast tissue type. Based on the results, this research has able to simulate a THz imaging system for breast cancer. Further modification to the system can be done to improve the imaging results.
A systematic review of radar technologies for surveillance of foreign object debris detection on airport runway Eka Setia Nugraha; Catur Apriono; Fitri Yuli Zulkifli
Bulletin of Electrical Engineering and Informatics Vol 13, No 6: December 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v13i6.8040

Abstract

Flights are projected to reach eight billion globally by 2037, demanding airport operators manage operations effectively, including safety on the runway due to the high number of aircraft movements. One crucial issue is any foreign object, commonly known as foreign object debris (FOD), that must be detected and cleaned immediately to ensure aircraft safety when taking off, landing, and taxing. The International Civil Aircraft Organization (ICAO) reported that FOD causes 10.08% of aviation accidents. Most airports manually monitor and detect FOD, which could be more effective and dangerous. Therefore, it is important to provide FOD detection systems with proper technologies. Radar technologies are potential FOD detection techniques that offer robustness to weather fluctuation. However, some factors must be considered properly to provide an effective FOD system. This paper reviews radar technologies for FOD detection on airport runways by considering factors, including types of debris, detection coverage, mode of radars, frequencies, and attenuation. It was found that all critical factors considered contribute to the quality of detection. This paper will provide guidelines for developing FOD detection based on radar technologies regarding airport necessities and its specific environment.
Co-Authors Ajib Setyo Arifin Andik Atmaja, Andik Ayyasy, Muhammad A’isya Nur Aulia Yusuf Basari Basari Catur Apriono Djoko Hartanto Eka Setia Nugraha Eko Tjipto Rahardjo Eko Tjipto Rahardjo, Eko Filda Ayu Afrida Halimsurya, Ervin Harahap, Nanda Ilham Herry Tony Andhyka I Wayan Mustika Ibnu Alinursafa Luh Putu Ratna Sundari Luthfi, Fitya M. B. Fathinah Hanun Maulana, Eka Mia Rizkinia MUHAMAD WAHYU IQBAL Muhammad Ikhwan Mushfar Ferdian, Mushfar Nugroho Adi Saputro Purnomo Sidi Priambodo Raj, Arockia Bazil Ucuk Darusalam Yosy Rahmawati