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All Journal JTERA (Jurnal Teknologi Rekayasa) Jurnal Teknik Journal of Applied Computer Science and Technology (JACOST) JITEL (Jurnal Ilmiah Telekomunikasi, Elektronika, dan Listrik Tenaga) Industrial Research Workshop and National Seminar eProceedings of Engineering Jurnal INFOTEL
Hepi Ludiyati
Politeknik Negeri Bandung
Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering Other

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Pengaruh Defected Ground Structure (DGS) Geometri Vertikal terhadap Antena Mikrostrip Berbahan Material Dielektrik Artifisial Marisa Putri Supriadi; Nurjanijan Madhatillah; Hepi Ludiyati
Prosiding Industrial Research Workshop and National Seminar Vol 12 (2021): Prosiding 12th Industrial Research Workshop and National Seminar (IRWNS)
Publisher : Politeknik Negeri Bandung

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Abstract

Pengaruh Defected Ground Structure (DGS) Geometri Vertikal terhadap Antena Mikrostrip Berbahan Material Dielektrik Artifisial
Penggunaan Statistical Duration Method Dalam Perancangan Total Dissolve Solution System Rida Hudaya; Hepi Ludiyati; Dodi Budiman Margana; Trisno Yuwono Putro; Robinsar Parlindungan; Rahmawati Hasanah; Fathan Muhammad Faris; Muhamad Rafhi Rihadatus Syawal; Julian Harith Al Banny Hudaya
Prosiding Industrial Research Workshop and National Seminar Vol 13 No 01 (2022): Vol 13 (2022): Prosiding 13th Industrial Research Workshop and National Seminar
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/irwns.v13i01.4234

Abstract

Makalah ini membahas rancangan perangkat Total Dissolve Solution System (TDS) yang diterapkan secara on-farm dengan menggunakan statistical duration method pada lingkungan wireless sensor networked. Rancangan ini bertujuan menjawab persoalan ketepatan penggunaan pupuk pada Precision Farming System, Rancangan perangkat keras terdiri dari sensor node, sink node, modul wifi, bluetooth, dan RTC. Statistical duration method digunakan dalam mengatur Total Dissolve Solution System yang bekerja berdasarkan nilai kepekatan pupuk. Untuk efisiensi biaya komunikasi, sistem jaringan menggunakan jaringan internet. Seluruh peristiwa yang terjadi di sink node dicatat pada data logger. Sedangkan sensor dan actor node memproses data masukan dan keluaran. Hasil rancangan ini menunjukkan tingkat waktu sleep sistem sebesar 86% setiap harinya. Sedangkan untuk akurasi pembelajaran duration method dengan machine learning bervariasi sekitar 96%. Secara fungsional sistem telah berjalan dengan baik seluruhnya.
Optimisasi Bentuk Feed Line Untuk Meningkatkan Performansi Antena Mikrostrip Segitiga Dual Band Gifari Muhammad; Bambang Sumajudin; Hepi Ludiyati
eProceedings of Engineering Vol 7, No 2 (2020): Agustus 2020
Publisher : eProceedings of Engineering

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Abstract

Pada penelitian ini, dilakukan optimisasi terhadap antena mikrostrip patch segitiga dengan difokuskan pada feed line atau lebih tepatnya microstrip feed line. Optimisasi dilakukan dengan perubahan bentuk feed line, yaitu bentuk normal, mengecil dan membesar dan Duroid RT5880 dan jenis substrat pada feed line, yaitu FR4, Taconic TLC32, dan Duroid RT5880. Tujuannya ialah mendapatkan bentuk feed line dan nilai permitivitas relatif substrat yang optimal terhadap parameter kinerja antena yaitu gain, bandwidth dan nilai return loss pada dua daerah frekuensi kerja dengan frekuensi inisial awal pada 2,4 GHz. Perubahan kinerja antena yang difokuskan pada optimasi ini adalah nilai 𝑺 𝑺𝟏𝟏𝟏�� fungsi frekuensi, gain dan bandwidth. Dari hasil optimisasi, diperoleh bahwa bentuk dan substrat feed line yang optimal ialah bentuk feed line mengecil pada substrat FR-4 Epoxy dan Taconic, dengan nilai return loss tertinggi 19,86 dB, nilai gain tertinggi 1,092 dBi, dan nilai bandwidth tertinggi 60,3 MHz pada band 1 (2,4 GHz), serta nilai return loss tertinggi 13,90 dB, nilai gain tertinggi 3,890 dBi, dan nilai bandwidth tertinggi 109,7 MHz pada band 2 (6,4 GHz).Kata kunci: antena mikrostrip segitiga, optimisasi feed line, dual bandfrequency, substrat.
SmartAgro-Spectral: Teknik Pengukuran Kandungan Nitrit Pada Sarang Burung Walet Berbasis Spektral Menggunakan Metode Regresi Linier Rida Hudaya; Hepi Ludiyati; Feni Isdaryani; Muhamad Rafhi Rihadatus Syawal; Julian Harith Al Banny Hudaya
Journal of Applied Computer Science and Technology Vol 4 No 2 (2023): Desember 2023
Publisher : Indonesian Society of Applied Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52158/jacost.v4i2.544

Abstract

Indonesia is the largest exporter of edible bird’s nest (EBN) to China, involving many EBN farmers from various regions in Indonesia. Therefore, a portable device is needed to rapidly and accurately measure the required quality of SBW to avoid rejection by Chinese buyers, which could result in significant losses. Consequently, for this purpose, an electronic instrument has been developed. smartAgro-Spectral is a microcontroller-based electronic instrument that measures nitrite content in edible bird’s nest (EBN) using linear regression method in machine learning calculations. This instrument can measure nitrite content based on the intensity of colors produced by EBN products. The coloring process is carried out by mixing EBW powder with Sulphanilamide solution and N-(1-naphthyl) Ethylenediamine Dihydrochloride (NED) solution. The concentration of EBN solution is normalized to values between 0.2 ppm and 0.7 ppm. The measurement process is carried out by emitting 18 waves of the light spectrum. The intensity of the 18 wavelengths of the measured light spectrum was selected based on the strong correlation between the intensity of the light spectrum and the value of nitrite content in the EBN product. The measurement results show that the intensity of the light spectrum that has a strong linear correlation is at wavelengths of 460 nm, 485 nm, 510 nm, 535 nm, and 610 nm. So, smartAgro-Spectral electronic instruments can be realized based on the intensity relationship of each wavelength through multiple linear regression analysis, and are able to linearly measure nitrite content in EBW products with a precision level of 99.85% and an accuracy rate of 99.85%.
Optimasi Antena Mikrostrip Multilayer Dengan Metode Parasitic U-Slot Pada Frekuensi C-Band Madiawati, Hanny; Nur Febriana, Liana; Ludiyati, Hepi; Sulaeman, Enceng
JTERA (Jurnal Teknologi Rekayasa) Vol 10, No 1: Juni 2025
Publisher : Politeknik Sukabumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31544/jtera.v10.i1.2025.25-32

Abstract

Antena mikrostrip merupakan antena yang mudah dirancang, ringan, dimensi yang kecil dan bahan substrat tidak mahal, namun antena mikrostrip memiliki kekurangan yaitu bandwidth yang sempit. Pada penelitian ini antena yang dirancang dan direalisasikan bekerja pada pita frekuensi C band dengan rentang frekuensi 5250-5725 MHz, untuk mengatasi permasalahan bandwidth tersebut sebelumnya telah dirancang antena mikrostrip dengan menggunakan metode multilayer parasitic dengan nilai bandwidth yang didapatkan sebesar 725 MHz, untuk mengoptimalkan penelitian sebelumnya pada penelitian ini dirancang dan direalisasikan antena mikrostrip dengan metode multilayer parasitic dengan penambahan metode u slot dengan teknik pencatuan proximity coupled yang berfungsi untuk meningkatkan bandwidth. Hasil pengujian dari penelitian ini antena mikrostrip multilayer parasitic dengan penambahan metode u-slot berhasil memperoleh peningkatan bandwidth sebesar 47.5% dari hasil realisasi sebelumnya antena mikrostrip multilayer parasitc tanpa menggunakan u-slot, dan diperoleh hasil band frekuensi pengujian antena 4980 - 6050 MHz, bandwidth 1.070 MHz, gain 5.48 dBi dan pola radiasi unidirectional. Substrat yang digunakan pada perancangan antena ini merupakan Rogers RT5880 dengan konstanta dielektrik (εr) = 2.2, ketebalan bahan (h) = 1.575 mm, dan tangen loss (δ) = 0,0009.
Two Omnidirectional Antenna Models for Ship Hull Corrosion Detection Radar System Ludiyati, Hepi; Zharfani Ashlah, Aqiila Putri; Jayanti, Erika Dwi; Madiawati, Hanny; Sulaeman, Enceng
JURNAL INFOTEL Vol 16 No 4 (2024): November 2024
Publisher : LPPM INSTITUT TEKNOLOGI TELKOM PURWOKERTO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20895/infotel.v16i4.1213

Abstract

This paper discusses two modified monopole antenna models. These antenna models are designed to detect hull corrosion of ships, which is predicted to be the cause of hull leaks. The modification was carried out by adding a conical parasitic element aimed at widening the bandwidth and increasing the antenna gain. The conical parasitic on the first antenna is directed upwards, while the second is the opposite. The first model uses a cone with a larger diameter than the second model. The calculation of the cone diameter is based on half the wavelength of the frequencies generated by the antenna. With a smaller diameter, PTFE is added between the monopole and the parasitic cone to avoid short circuits. This configuration is intended to see the effective antenna model widen the bandwidth and increase the gain. Antenna performance testing was carried out using a vector network analyzer and software-defined radio. The test results show that both antenna models are omnidirectional in radiation. The first model operates at a frequency of 3904.7 - 7793.1 MHz with a bandwidth of 3888.4 MHz and a highest gain of 10 dBi. The second model operates at a frequency of 2282.4 - 3324.1 MHz with a bandwidth of 1041.7 MHz and a highest gain of 8dBi. Thus, the first antenna model has a higher bandwidth and gain than the first model, but both have met the requirements for ship hull corrosion detection antennas.
Sistem Pemantauan Kelembaban Tanah Jarak Jauh Berbasis LoRa Menggunakan Sensor pH dan Kelembaban Gani, Mina Naidah; Hepi Ludiyati; Rifa Hanifatunnisa; Eril Mozef; Rizqa Nur Ananti
Jurnal Teknik: Media Pengembangan Ilmu dan Aplikasi Teknik Vol 22 No 2 (2023): Jurnal Teknik - Media Pengembangan Ilmu dan Aplikasi Teknik
Publisher : Fakultas Teknik - Universitas Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55893/jt.vol22no2.564

Abstract

This study focuses on the pivotal role of water and soil in agriculture, emphasizing their significance for photosynthesis and as a planting medium, respectively. Maintaining uncontaminated soil is crucial for optimal crop growth. Remote monitoring of soil quality is facilitated by LoRa technology, with a microcontroller system employing sensors for soil moisture and pH. YL-69 moisture sensors exhibit an average error of 0.077%, with a range from 0% to 0.016%, while pH electrode probe sensors register an average error of 0.0288%, ranging from 0.034% to 0.021%. The monitoring data is transmitted through the LoRa network connected to ESP32. Field testing under Line-of-Sight (LOS) conditions at a maximum distance of 500 meters and Non-Line-of-Sight (NLOS) conditions up to 50 meters reveals that the gateway successfully detects RSSI values (-104 dBm to -64 dBm) and SNR values (-2dB to +10dB) within acceptable ranges. The average delay during data transmission between the node and the gateway is measured at 2.118 seconds. This research demonstrates the effectiveness of LoRa technology in remotely monitoring and transmitting crucial soil parameters, providing valuable insights for precision agriculture.
Co-Authors Adriani Nurul Diastary Amila Nabilah Aninda Al Shifa Anisa Dwi Utami Bagus Edy Sukoco Bambang Sumajudin Cucun Noviyanti Dandi Taufiqurrohman Dania Farahiyah Didin Saefudin Dodi Budiman Margana Eka Pratiwi Elisma Elisma Enceng Sulaeman Eril Mozef Fathan Muhammad Faris FENI ISDARYANI Feni Isdaryani Frieta Rizki Andhita Ghania Yuntafa Putri Gifari Muhammad Gifari Muhammad Hanifatunnisa, Rifa HANNY MADIAWATI, HANNY Hasanah, Rahmawati Hudaya, Rida Idhamartya Wulani Jayanti, Erika Dwi Julian Harith Al Banny Hudaya Julian Harith Al Banny Hudaya Marisa Putri Supriadi Mina Naidah Gani Muhamad Rafhi Rihadatus Syawal Muhamad Rafhi Rihadatus Syawal Muhammad Hilman Maulana Muhammad Zaki Zulfikar Nadya Aprilita Nur Febriana, Liana Nurfiana Nurfiana Nurjanijan Madhatillah Partomuan Gearry Regina Aprilia Maharani Yusuf Rendi Restiandi Ridwan Solihin Rizqa Nur Ananti Robinsar Parlindungan Sulistia Suwondo Sutrisno Sutrisno Tiara Septiany Persada Trisno Yuwono Putro Triyastika Amaliya W. Tri Hartono Wikamdani Wikamdani Yadhi Aditya Permana Yaya Sulaeman Yuliana Nur Rahmawati Yumna Salma Azzahra Zharfani Ashlah, Aqiila Putri