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All Journal Jurnal Informatika dan Teknik Elektro Terapan SPEKTRAL : Journal of Communications, Antennas and Propagation
Fitri Elvira Ananda
Politeknik Negeri Jakarta
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering

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Simulasi Direct Sequence Spread Spectrum (DSSS) Pada Modulasi Binary Phase Shift Keying (BPSK) Nabila Khansa Hartono; Faradila Alvina Putri; Fitri Elvira Ananda
Spektral Vol. 2 No. 1 (2021): April 2021
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v2i1.3706

Abstract

Spread spectrum is a data transmission technique that spreads out information spectrum energy signals in a frequency band that is much larger than the minimal spectrum. One of the spread spectrum techniques is Direct Sequence Spread Spectrum (DSSS). This research was built the simulation of DSSS on Binary Phase Shift Keying (BPSK) modulation using MATLAB software. The simulation results of this DSSS simulation are displaying information wave signals, PN codes, signals that have been added with PN codes, signals modulated with BPSK, modulation signals that have been added with AWGN noise, demodulation signals, DSSS output signals and BER vs SNR graphics on the channel AWGN. The simulator of DSSS on BPKS in this research have been running according to the DSSS signal order flow and theoretical concept.   Keywords: AWGN, BPSK , DSSS, PN Code, PN Sequence
RANCANG BANGUN SISTEM KEHADIRAN SECARA REAL TIME MENGGUNAKAN FACE RECOGNITION DENGAN METODE SSD DI SMK NEGERI 53 JAKARTA Azizah Azzahra; Fitri Elvira Ananda
Jurnal Informatika dan Teknik Elektro Terapan Vol 12, No 1 (2024)
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jitet.v12i1.3912

Abstract

SMK Negeri 53 Jakarta melakukan pengembangan terhadap pengelolaan data kehadiran di lingkungan sekolah. Pengembangan yang dilakukan adalah membuat sebuah sistem kehadiran menggunakan teknologi pengenalan wajah secara realtime dengan menggunakan metode Single Shot MultiBox Detector (SSD). Metode SSD merupakan salah satu metode pendeteksian dan pengenalan objek dengan deep learning, yang dapat digunakan untuk mendeteksi wajah secara cepat dan akurat.  Penelitian dilakukan dengan menggunakan kamera yang terintegrasi dengan website sistem kehadiran yang sudah ditanam algoritma SSD. Hasil pengujian menunjukkan bahwa sistem kehadiran yang sudah dirancang mampu melakukan pendeteksian dan pengenalan wajah dengan nilai tertinggi untuk tingkat akurasi 100%, nilai recall 100%,  nilai pendeteksian wajah 80%, nilai pengenalan wajah 90%, nilai efisiensi dalam segi waktu 95.8%, dan nilai efisiensi dengan sistem kehadiran lainnya sebesar 86%. Dengan mengimplementasikan teknologi pengenalan wajah menggunakan metode SSD pada sistem absensi akan memberikan efisiensi dalam segi waktu, dan proses pendataan serta pengolahan data kehadiran.  
Perancangan dan Karakterisasi Antena Vivaldi untuk Aplikasi Anti-Drone Jammer pada Frekuensi 1,2 GHz, 2,4 GHz, dan 5,8 GHz Muhammad Umar Zain; Fitri Elvira Ananda; Nanang Kurniawan
Spektral Vol. 7 No. 1 (2026): April 2026
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v7i1.8546

Abstract

This study presents the design of three vivaldi antennas operating at 1.2 GHz, 2.4 GHz, and 5.8 GHz, which are implemented as part of an anti-drone jammer transmission system. Unmanned aerial vehicles (UAVs), commonly known as drones, have experienced rapid growth and are widely utilized in both military and civilian applications. This development has increased the demand for effective counter-drone technologies, one of which is an anti-drone jammer system designed to disrupt radio-frequency communication between drones and their controllers. The antenna design process includes planning, mathematical calculations, simulation, fabrication, and performance characterization. Measurement results show return loss values of −20.52 dB, −15.16 dB, and −34.16 dB at 1.2 GHz, 2.4 GHz, and 5.8 GHz, respectively, with corresponding VSWR values of 1.17, 1.38, and 1.04. The proposed antennas achieve gains of 5.28 dBi, 8.34 dBi, and 6.15 dBi at the respective operating frequencies. Radiation pattern measurements indicate directional characteristics in the vertical plane, making the antennas suitable for jamming applications. The results confirm that proper simulation and optimization processes play a crucial role in achieving antenna performance that satisfies design specifications and supports implementation in anti-drone jammer systems.
Antena Wearable Coplanar Waveguide pada Frekuensi 915 MHz untuk Komunikasi LoRa Angellia Malika Putri Setiawan; Fitri Elvira Ananda; Shita Herfiah
Spektral Vol. 7 No. 2 (2026): Oktober 2026
Publisher : Politeknik Negeri Jakarta

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

Abstract

Advances in wearable technology and the Internet of Things (IoT) have driven the need for antennas that are flexible, lightweight, and capable of optimal performance at 915 MHz for LoRa communication. This study aims to design and simulate a flexible, wearable microstrip antenna using a silicone rubber substrate with a CPW-fed coplanar waveguide (CPW) technique at 915 MHz. The novelty of this research lies in the application of the CPW-fed technique to a flexible microstrip antenna made of silicone rubber, optimized for 915 MHz LoRa communication while considering radiation characteristics and Specific Absorption Rate (SAR) values. The research methods included initial dimension calculations, design, simulation, and optimization using CST Studio Suite 2025, as well as SAR analysis using a chest body phantom. Simulation results showed that the antenna resonated at 915 MHz with an S11 value of −26.10 dB, a gain of 4.27 dBi, and a bandwidth of 6 MHz. The antenna exhibits a directional radiation pattern, with surface current distribution concentrated on the patch and feedline, and a maximum SAR value of 0.691 W/kg at a distance of 0 mm, which remains below the ICNIRP limit of 2 W/kg. Based on the simulation results, the antenna meets LoRa communication specifications and electromagnetic exposure safety requirements. This research is still limited to the simulation stage; therefore, fabrication and experimental testing are needed to validate the antenna’s performance under actual usage conditions.
Co-Authors Angellia Malika Putri Setiawan Azizah Azzahra Faradila Alvina Putri Muhammad Umar Zain Nabila Khansa Hartono Nanang Kurniawan Shita Herfiah