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All Journal International Journal of Evaluation and Research in Education (IJERE) ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Lectura : Jurnal Pendidikan AUTOCRACY: Jurnal Otomasi, Kendali, dan Aplikasi Industri Jurnal Pendidikan Vokasional Teknik Elektronika (JVoTE) International Journal of Business, Law, and Education Prosiding Seminar Nasional Pengabdian Kepada Masyarakat Jurnal Pendidikan Teknik dan Vokasional Journal of Global Engineering Research & Science (J-GERS) JOP
Efri Sandi
Universitas Negeri Jakarta
Arts Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mechanical Engineering Neuroscience Public Health Social Sciences Transportation Other

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Desain Antena Reflektor Parabola untuk Aplikasi Radar Maritim dengan Rekayasa Feed Horn SANDI, EFRI; DIAMAH, AODAH; SANTOSO, ARDI IMAM
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 11, No 2: Published April 2023
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v11i2.451

Abstract

ABSTRAKPada studi ini dilakukan analisis penambahan batang metal berbentuk persegi di dalam feed horn piramida antena reflektor parabola untuk meningkatkan performansi gain, beamwidth dan side lobe level. Kebutuhan utama antena radar maritim adalah memiliki gain yang besar ≥ 27 dB, beamwidth kecil ≤ 2o, dan side lobe level yang rendah ≤ -30 dB. Oleh karena itu, perlu diajukan teknik desain antena parabola dengan penambahan batang metal berbentuk persegi di dalam feed horn piramida untuk meningkatkan performasi gain, beamwidth dan side lobe level. Hasilnya dapat meningkatkan gain antena reflektor parabola menjadi 36,9 dB, memperkecil beamwidth menjadi 1,9o dan menekan side lobe level menjadi 31,4 dB. Hasil studi ini mengkonfirmasi bahwa teknik desain dengan menambahkan batang metal persegi di dalam feed horn piramida antena reflektor parabola dapat meningkatkan performasi gain, beamwidth dan side lobe level lebih baik dibandingkan desain tanpa penambahan batang metal persegi.Kata kunci: antena parabola, feed horn piramida, antena radar maritim, gain ABSTRACTIn this study, an analysis of the addition of square-shaped metal rods was carried out in the pyramid feed horn of a parabolic reflector antenna to increase gain, beamwidth and side lobe level performance. The main requirement for a maritime radar antenna is to have a large gain ≥ 27 dB, a small beamwidth of ≤ 2o, and a low side lobe level of ≤ -30 dB. Therefore, it is necessary to propose a parabolic antenna design technique with the addition of a rectangular metal rod inside the pyramidal feed horn to improve gain, beamwidth and side lobe level performance. The result can increase the gain of the parabolic reflector antenna to 36.9 dB, reduce the beamwidth to 1.9o and suppress the side lobe level to 31.4 dB. The results of this study confirm that the design technique by adding a square metal rod in the pyramid feed horn of a parabolic reflector antenna can improve gain, beamwidth and side lobe level performance better than the design without the addition of square metal rods.Keywords: parabolic antenna, pyramid feed horn, maritime radar antenna, gain
Desain U-slot Ganda untuk Meningkatkan Bandwidth Antena MIMO 5G Millimeter-wave SANDI, EFRI; DJATMIKO, WISNU; PUTRI, RIZKITA KURNIA
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 8, No 1: Published January 2020
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v8i1.150

Abstract

ABSTRAKPada penelitian ini dikembangkan rekayasa antena mikrostrip (MSA) dengan penambahan U-slot ganda untuk meningkatkan performansi bandwidth antena mikrostrip. Penelitian sebelumnya berfokus pada penambahan U-slot tunggal dan didesain untuk frekuensi di bawah 15 GHz. Kebutuhan utama antena 5G adalah memiliki bandwidth yang lebar dan kemampuan Multiple Input Multiple Output (MIMO). Untuk itu perlu dikembangkan desain antena MIMO 5G dengan bandwidth yang lebih lebar pada frekuensi millimeter-wave 28 GHz sebagai kandidat utama alokasi frekuensi untuk komunikasi seluler 5G. Pada penelitian ini diajukan teknik desain antena MIMO dengan penambahan rekayasa U-slot ganda untuk meningkatkan performansi bandwidth. Hasil kalkulasi dan simulasi menunjukkan bahwa dengan penambahan U-slot ganda, dihasilkan peningkatan performansi bandwith sebesar 68% dibandingkan desain antena tanpa U-slot. Jika dibandingkan dengan hasil penelitian U-slot sebelumnya, penambahan U-slot ganda menghasilkan peningkatan bandwidth sebesar 76%. Kata kunci: U-Slot ganda, antena 5G millimeter-wave, MIMO, bandwidth ABSTRACT In this study, a microstrip antenna (MSA) was developed with the addition of a double U-slot to improve bandwidth performance. Previous studies have focused on adding single U-slots and designed for frequencies below 15 GHz. The main requirement for 5G antennas is high bandwidth performance and multiple inputmultiple output capabilities (MIMO). Therefore, it is necessary to develop a 5G MIMO antenna with broader bandwidth at the millimeter-wave frequency 28 GHz as the primary candidate for frequency allocation for 5G cellular communication. In this study, MIMO antenna design techniques were proposed with the addition of a double U-slot method to improve bandwidth performance. The calculation and simulation results show that with the addition of a double U-slot, an increase in bandwidth performance of 68% compared to antenna designs without U-slots and 76% when compared to using a single U-slot in previous studies. Keywords: Double U-Slot, millimeter-wave 5G antenna, MIMO, bandwidth
Prototype Design of Radio Frequency Energy Harvesting for Lighting Applications Rohana, Assa Kesthy; Djatmiko, Wisnu; Sandi, Efri; Pangestu, Agung; Al Hakim, Rosyid Ridlo
Journal of Global Engineering Research and Science Vol. 2 No. 1 (2023): Journal of Global Engineering Research & Science (J-GERS)
Publisher : Jakarta Global University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56904/j-gers.v2i1.42

Abstract

The prototype resonant frequency is designed to work at 150 MHz. The signal source prototype is the signal that comes from handy talky (HT). There are two subsystems, which are Matching Impedance and Voltage Multiplier. The resonant frequency of the matching impedance subsystem at 143 MHz from 0.053 mH inductor and 0.0233 pF capacitor. The output of the matching impedance subsystem is then amplified by the multiplier voltage subsystem using parallel PH4148 diodes with the 6-stage multiplier. Load prototype is a CR-151 LED that works at 12 volts 1 watt. When the HT battery has a voltage of 7.3 volts, the prototype can turn on the lamp with the distance between the TX antenna and the antenna on the prototype less than 36 cm. The maximum voltage on the load is 6.8 volts with a length of 5 cm between the antenna and the lamp 774 lumen.
Empowering Vocational Learning: Animated Video and Talking Stick Methods in Hand-Foot Care Ayudyah Khusuma Wardani; Neneng Siti Silfi Ambarwati; Efri Sandi
Journal of Pedagogi Vol. 2 No. 1 (2025): Journal of Pedagogi - February
Publisher : PT. Anagata Sembagi Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62872/c9yga792

Abstract

In hand and foot care, vocational education often faces challenges related to student engagement and skill mastery. This study aims to evaluate the effectiveness of a combined instructional approach using animated video media and the talking stick method to enhance practical learning outcomes. Employing a quasi-experimental design with a pretest-posttest approach, participants were vocational students (n = 60) specializing in beauty and wellness courses at a local training center. They were divided into two groups: an experimental group receiving animated video lessons augmented by collaborative discussions using the talking stick, and a control group receiving conventional lecture-based instruction. Data were gathered through standardized skill assessments, knowledge-based quizzes, and focus group interviews. Quantitative results showed a statistically significant improvement (p < 0.05) in both theoretical understanding and practical proficiency in the experimental group compared to the control group. Qualitative findings revealed heightened engagement and self-confidence among students participating in the interactive sessions. These outcomes suggest that integrating animated video, which provides clear, step-by-step demonstrations, with the talking stick approach, which ensures equitable participation and fosters collaboration, can substantially enrich vocational learning experiences. This study highlights the potential for innovative, interactive teaching methods to improve student outcomes in skill-based disciplines, recommending broader adoption of multimedia-supported and discussion-driven strategies in vocational curricula.  
RANCANG BANGUN RECTIFIER PADA RECTENNA UNTUK TRANSFER DAYA WIRELESS PADA FREKUENSI 2,45 GHZ Hijriani, Endah; Maruddani, Baso; Sandi, Efri
JURNAL PENDIDIKAN VOKASIONAL TEKNIK ELEKTRONIKA (JVoTE) Vol. 1 No. 1 (2018): JURNAL PENDIDIKAN VOKASIONAL TEKNIK ELEKTRONIKA (JVoTE) Volume 1, No. 1, April
Publisher : PENDIDIKAN VOKASIONAL TEKNIK ELEKTRONIKA FAKULTAS TEKNIK UNIVERSITAS NEGERI JAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jvote.v1i1.6900

Abstract

Sistem Transfer Daya Wireless merupakan sistem yang digunakan untuk memanfaatkan energi elektromagnetik yang tersebar bebas di udara dengan mengolah sumber energi untuk mengisi daya pada perangkat elektronik berdaya rendah. Salah satu sumber energi yang mudah diperoleh karena ketersediaannya yang cukup melimpah adalah access point (Wi-Fi). Rectenna adalah perangkat yang dapat digunakan untuk mengubah gelombang elektromagnetik di udara menjadi arus listrik searah. Rectenna terdiri dari antena dan rangkaian penyearah (rectifier). Antena digunakan untuk menangkap gelombang elektromagnetik yang dipancarkan oleh sumber RF. Daya yang dierima oleh antena akan diteruskan ke rangkaian rectifer, untuk diubah menjadi arus listrik searah (DC). Penelitian bertujuan untuk merancang, membuat, dan mengukur parameter rangkaian rectifier pada rectenna yang mampu bekerja pada jangkauan frekuensi 2,45 GHz. Setelah dirancang dari hasil simulasi menggunakan software ADS 2011didapatkan frekuensi kerja 2,449 GHz, output voultage 2,027 Volt, Return S11(Return Loss) -34,87, dan VSWR 1,037. Pada hasil pengukuran pada signal generator pada frekuensi 2,45 GHz didapatkan output voltage dengan input -5 dBm sebesar 54,8 mV, S11 (Return Loss) sebesar -10,416 dB, dan VSWR sebesar 1,862. Hasil pengukuran kedua dengan menggunakan access point Wi-Fi pada jarak 5 cm didapatkan output voltage sebesar 2,066 Volt, sedangkan pada jarak 20 cm didapat output voltage sebesar 0,092 mV.
Rancang Bangun Sistem Monitoring Detak Jantung (Electrocardiogram) Suhu Tubuh Denyut Nadi Berbasis Nodemcu Esp32 Dan Esp8266 Dengan Menggunakan Wearable Device Cahyo Purnomo, Dandy; Sandi, Efri; Yusro, Muhammad
JURNAL PENDIDIKAN VOKASIONAL TEKNIK ELEKTRONIKA (JVoTE) Vol. 5 No. 1 (2022): Vol 5 No 1 (2022): JURNAL PENDIDIKAN VOKASIONAL TEKNIK ELEKTRONIKA (JVoTE) Volu
Publisher : PENDIDIKAN VOKASIONAL TEKNIK ELEKTRONIKA FAKULTAS TEKNIK UNIVERSITAS NEGERI JAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jvote.v5i1.39347

Abstract

The purpose of this research is to create a heart rate monitoring system (Electrocardiogram) pulse body temperature based on NodeMCU ESP32 and ESP8266 using a Wearable Device for use by military/TNI soldiers during exercise such as pushups, squat jumps, bending, and others related to the distance. not far, not too heavy, and not in the water through the GOIOT monitoring website which can then be used by trainers, teachers, or trainers from a military/TNI soldier in monitoring. This research was conducted using the research and development method developed by Brog & Gall. The basic principle that is characteristic of the research and development method is the 4-stage Brog & Gall Model, namely: the analysis stage, the design stage, the development stage, and the testing stage. The system performance of the heart rate sensor (Electrocardiogram) with the AD-8232 ECG module while exercising can read the physiological parameters of the ECG heart rate from a voltage of 0.1 to a voltage of 5.0 (mV). Temperature sensor Dallas DS18b20 Thermal Digital Sensor while exercising can read the human body temperature from 0°C to 100°C. MAX30100 pulse sensor, can read the human pulse when exercising from 0 bpm to 160 bpm. The performance of the system can work with a distance of 1 meter to 30 meters in an open environment without intervening with others (without any obstacles). Can be used with a full incharge of the battery from 8.27 Volts for 4 hours non-stop, that is, until the battery remains 7 Volts. The implication is that it can be used to detect only three data, namely heart rate (Electrocardiogram) body temperature pulse to then be forwarded to monitoring devices positioned at operators who need the data such as doctors or people who understand readings from heart rate (Electrocardiogram) body temperature pulse rate only.
Analisis Perubahan Jaringan Telekomunikasi Central Toka LIM4 Wilayah Jatinegara Dari Saluran Tembaga Menjadi Fiber Optik Ramadhan, Rio; Sandi, Efri
JURNAL PENDIDIKAN VOKASIONAL TEKNIK ELEKTRONIKA (JVoTE) Vol. 4 No. 2 (2021): JURNAL PENDIDIKAN VOKASIONAL TEKNIK ELEKTRONIKA (JVoTE) Volume 4, No. 2, Desemb
Publisher : PENDIDIKAN VOKASIONAL TEKNIK ELEKTRONIKA FAKULTAS TEKNIK UNIVERSITAS NEGERI JAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jvote.v4i2.39453

Abstract

Makalah Komprehensif Analisis Perubahan Jaringan Telekomunikasi Central Toka LIM 4 Wilayah Jatinegara Dari Saluran Tembaga Menjadi Fiber Optik bertujuan untuk menganalisis perubahan jaringan telekomunikasi dari saluran tembaga menjadi fiber optik. Untuk perubahan jaringan telekomunikasi dari saluran tembaga menjadi fiber optik di wilayah jatinegara menggunakan parameter seperti latency, packet loss dan troughput. Dalam perhitungan parameter yang membandingkan antara tembaga dengan fiber optik mendapatkan hasil bahwa untuk tembaga memiliki nilai yang lebih besar dibanding dengan nilai pada fiber optik. Kesimpulannya Fiber optik menjadi pilihan yang bagus untuk melakukan transfer data dan informasi yang akurat dibanding dengan menggunakan saluran tembaga. Nilai pada paramaternya menunjukkan untuk pengukuran latency pada fiber optik lebih kecil dari 3,7 ms sampai 5 ms dibanding dengan tembaga yang memiliki nilai 3,42 ms sampai 15,42 ms. Untuk nilai parameter pada pengukuran packet loss pada fiber optik memiliki nilai 0,64 % sampai 0,82 % dibanding dengan tembaga yang memiliki nilai 0,807 % hingga 0,88 %. Sedangkan untuk pengukuran throughput nilai fiber optik lebih besar dibanding dengan tembaga dikarenakan kecepatan dan keakuratan dalam melakukan transfer data setiap detik.
Modul Pembelajaran Penggunaan Software CST Microwave Studio untuk Mata Kuliah Teknik Antena dan Propagasi Gelombang Elektromagnetik Yolanda, Sara; Sandi, Efri; Djatmiko, Wisnu
JURNAL PENDIDIKAN VOKASIONAL TEKNIK ELEKTRONIKA (JVoTE) Vol. 4 No. 2 (2021): JURNAL PENDIDIKAN VOKASIONAL TEKNIK ELEKTRONIKA (JVoTE) Volume 4, No. 2, Desemb
Publisher : PENDIDIKAN VOKASIONAL TEKNIK ELEKTRONIKA FAKULTAS TEKNIK UNIVERSITAS NEGERI JAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jvote.v4i2.39455

Abstract

Penelitian ini bertujuan untuk menghasilkan bahan ajar Modul CST Microwave Studio Suite. Bahan ajar dirancang untuk memudahkan mahasiswa dan pembaca dalam belajar merancang antena. Belum tersedianya bahan ajar mandiri yang sesuai dengan kebutuhan pembaca dan mahasiswa yang dapat digunakan dengan mudah dan menarik serta memotivasi pembaca dan mahasiswa dalam belajar. Bahan ajar mandiri tersebut harus dapat digunakan tanpa harus adanya bantuan bahan ajar lain. Penelitian ini dilakukan di Jurusan Teknik Elektro terkhusus di Pendidikan Teknik Vokasional di Universitas Negeri Jakarta pada bulan April 2020 – Juli 2020. Penelitian ini menggunakan metode Penelitian dan Pengembangan, yaitu mengembangan produk yang dibutuhkan dan menguji keefektifan modul tersebut. Pengembangan produk ini yaitu bahan ajar berupa adanya Modul CST Microwave Studio Suite yang selama ini dibutuhkan. Penelitian ini diawali dengan menganalisis kebutuhan siswa kemudian dilakukan perancangan Modul CST Microwave Studio Suite untuk pembaca dan mahasiswa Pendidikan Teknik Elektronika Universitas Negeri Jakarta.
The Delphi-Goal Oriented Evaluation Model to Implementing Teaching Factory in Vocational High School at Bogor Regency Nurrohmawati, Lisna; Sastrawijaya, Yuliatri; Sandi, Efri
International Journal of Business, Law, and Education Vol. 4 No. 2 (2023): International Journal of Business, Law, and Education
Publisher : IJBLE Scientific Publications Community Inc.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56442/ijble.v4i2.206

Abstract

Learning with teaching factory has a focus point, namely the application of competency-based learning and production-based learning with link and match between Vocational High Schools and industry. This research is a mixed method research. This study uses the Goal Oriented program evaluation model with Delphi method to obtain the opinion of experts to determine the standard of assessment that will be used to measure the implementation of teaching factory. The Goal Oriented evaluation model is used to measure program achievement based on the objectives of the teaching factory program applied to the Vocational High School level. The research was conducted at vocational high school that hold multimedia expertise competencies in Bogor Regency. The research sample consisted of eleven schools with an average overall result in Bogor Regency was 82.23. Based on these values, it can be concluded that the implementation of the teaching factory in Bogor Regency is well implemented.
RANCANG BANGUN BANDPASS FILTER MIKROSTRIP MENGGUNAKAN METODE INTERDIGITAL COUPLE DENGAN OPEN STUB DAN DGS PADA FREKUENSI X-BAND 9,4 GHz UNTUK RADAR PENGAWAS PANTAI Sandi, Efri; Pebriani, Melia Putri; Arifin, Maulana Ali; Akbar, Anshari
Jurnal Pendidikan Teknik dan Vokasional Vol. 6 No. 2 (2023): Jurnal Pendidikan Teknik dan Vokasional
Publisher : LPPM, Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JPTV.6.2.97

Abstract

This study uses an interdigital microstrip filter design using open stub and defected ground structure for coastal surveillance radar applications. The proposed design uses the open stub method to improve bandwidth performance and defected ground structure to improve return loss and insertion loss performance. The bandwidth, return loss, and insertion loss performance of the proposed filter will be compared with conventional interdigital filter designs to determine their improvements. Numerical and simulation results show significant improvements in bandwidth, return loss, and insertion loss performance compared to conventional designs. The proposed filter design can operate in the 9.4 GHz frequency band with a bandwidth of 60 MHz, with a return loss of ≤ -10 dB and an insertion loss of ≥ -3 dB. These results prove that the proposed filter design can be used for coastal surveillance radar applications in the X-Band.
Co-Authors Agung Pangestu Akbar, Anshari Arifin, Maulana Ali Ayudyah Khusuma Wardani Baso Maruddani Cahyo Purnomo, Dandy Diamah, Aodah Djatmiko, Wisnu Fajar Dwi Artikah Gilang Fajar Romadan Hasrul Baki Hasibuan Hijriani, Endah Ilmi Zajuli Ichsan Iqbal Nurpauzi Jusuf Bintoro Lisna Nurrohmawati Muhammad Fahmi Nurfadilah Muhammad Iqbal Muhammad Yusro NAUFAL SALAM, MUHAMMAD FADHIL NAUFAL SALAM, MUHAMMAD FADHIL Neneng Siti Silfi Ambarwati Nurrohmawati, Lisna Pebriani, Melia Putri PUTRI, RIZKITA KURNIA Rafiuddin Syam Ramadhan, Rio Rezi Berliana Yasinta Rika Sa&#039;diyah Rohana, Assa Kesthy Rosyid Ridlo Al-Hakim SANTOSO, ARDI IMAM Silvie Annisa, Maudy Siti Sahara Siti Shofiyah Vania Zulfa Vina Oktaviani Vina Oktaviani Yolanda, Sara Yuliatri Sastrawijaya Yuliatri Sastrawijaya, Yuliatri