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All Journal Perfecting a Video Game with Game Metrics Jurnal Teknologi Elektro Indonesian Journal of Electrical Engineering and Computer Science Jurnal Nasional Teknik Elektro dan Teknologi Informasi
Said Attamimi
Universitas Mercu Buana
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering

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Analisa Karakteristik Kanal HF Lintasan Jamak Rizki Nugraha Hidayat; Umaisaroh Umaisaroh; Said Attamimi
Jurnal Teknologi Elektro Vol 11, No 3 (2020)
Publisher : Electrical Engineering, Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jte.2020.v11i3.002

Abstract

Indonesia merupakan negara kepulauan terbesar di dunia. Oleh karena itu, diperlukan konsep dan perencanaan sistem komunikasi jarak jauh yang murah dan handal agar bisa terhubungnya komunikasi di wilayah kepulauan yang relatif sulit dijangkau oleh sistem kabel yang sudah terhubung saat ini. Sistem komunikasi high frequency (HF) yang beroperasi pada frekuensi 3-30 MHz. Sistem ini memanfaatkan lapisan ionosfer sebagai media transmisi gelombang radionya. Lapisan ionosfer sangat dipengaruhi oleh aktivitas matahari dan perubahan waktu sepanjang hari. Hal ini berakibat timbulnya gangguan-gangguan ionosfer yang menyebabkan kinerja sistem komunikasi HF terganggu juga kondisi dimana terdapat interferensi ketika sinyal lebih dari satu jalur pada saat ditransmisikan hal ini dinamakan multipath atau lintasan jamak. Karakteristik kanal HF menjadi hal yang sangat penting. Dengan mengetahui karakteristik kanal HF yang tepat kita dapat mencapai kinerja sistem komunikasi yang lebih baik. Perubahan kondisi lapisan ionosfer berpotensi mempengaruhi kinerja sistem komunikasi HF yang disebabkan oleh nilai delay spread. Pada penelitian ini dilakukan analisa parameter karakteristik kanal HF mengenai power delay profile dan delay spread yang dilakukan dengan uji simulasi. Berdasarkan hasil percobaan dalam kurun waktu 2 bulan. Dilakukan sebanyak 8 kali percobaan dalam 4 waktu yang berbeda. Menghasilkan nilai delay spread maksimal terjadi pada pagi hari yaitu bernilai 124,1 ms berbeda dengan sore hari yang memiliki nilai 41 ms.
Bandpass filter based on complementary split ring resonators at X-band Furqan Furqan; Said Attamimi; Andi Adriansyah; Mudrik Alaydrus
Indonesian Journal of Electrical Engineering and Computer Science Vol 13, No 1: January 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v13.i1.pp243-248

Abstract

Complementary Split Ring Resonators were used integrated in a substrate integrated waveguide to generate passband charateristics in X-Band. Based on a parameter study with an electromagnetic commercial software, the characteristics of double and quadruple CSRRs according the reflection and transmission factor were observed. The computer simulation showed, the bandpass filter worked in the frequency range 8.12-8.63 GHz and 8.11-8.63 GHz for double and quadruple CSRR, respectively. The insertion loss was 0.12 dB and 0.015 dB. The measurement mit a vector network analyzer verified the simulation results. The frequeny range measured was 8.12-8.67 GHz and 8.12-8.61 GHz for double and quadruple CSRRs, respectively. The measured insertion loss was 0.25 dB and 0.2 dB.
Antena Mikrostrip dengan Dua Buah U-Slot untuk Aplikasi Wi-Fi dan 5G Dian Widi Astuti; Alya Patrakomala; Muslim Muslim; Said Attamimi; Dwi Astuti Cahyasiwi
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 11 No 4: November 2022
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jnteti.v11i4.4101

Abstract

The development of telecommunications on wireless networks is advancing very rapidly. This rapid development is caused by the need for rapid information accessible from anywhere. One of the devices on the wireless network telecommunications system is an antenna. Antennas that can work on multiple wireless network frequencies on telecommunications system devices are indispensable. Therefore, this study proposes the design of a microstrip antenna capable of simultaneously working on two wireless network frequencies, namely Wi-Fi and fifth-generation cellular telecommunications (5G). The microstrip antenna was designed using two slots, i.e., the disconnected rectangular ring and inverted U-shaped slots. The Wi-Fi and 5G frequencies working on this antenna were 2.45 GHz and 3.3 GHz. The resonant frequency on the antenna of this microstrip was affected by the slot length. The antenna was designed and fabricated using a Rogers 5880 substrate with a material’s relative permeability (er) of 2.2, a tangent loss (d) of 0.0009, and a thickness of 1.575 mm. Before being fabricated, the antenna design was simulated using the Ansys HFSS simulator, which is a simulator for designing components using electromagnetic waves including antennas. Compared to the simulation results, the results of reflection coefficient measurement in this antenna design showed excellent results for both frequencies. In the simulation results, the reflection coefficient provided a bandwidth of 123 MHz in the 2,412-2,535 MHz frequency range, while the measurement results provided a bandwidth value of 153 MHz in the 2,402-2,555 MHz frequency range for the Wi-Fi frequency application. At the 5G frequency, a measuring bandwidth of 87 MHz was obtained in the range of 3,260-3,347 MHz. The measurement results were commensurate with the simulation results, which obtained a bandwidth of 88 MHz in the range of 3,248-3,336 MHz. Therefore, the fabrication of this antenna design can be used for both applications.
Optimized multibeam synthesis of time-modulated microstrip arrays Mudrik Alaydrus; Said Attamimi; Umaisaroh Umaisaroh
Indonesian Journal of Electrical Engineering and Computer Science Vol 28, No 3: December 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v28.i3.pp1563-1572

Abstract

The capability to form the main beam of antennas improves the energy efficiency of wireless systems and enhances radar systems' effectiveness in detecting and tracking objects. The time-modulated array can generate multibeam with arbitrary directions in different spectral parts. This work synthesizes several linear arrays to achieve particular main beams and additional restrictions. We modify the pulse durations and the switch-on instants of the switches in each antenna element in an optimization procedure. The parameters are varied through the simulated annealing by minimizing certain cost functions. We designed three linear arrays: model 1 consists of six elements and has two beams. Model 2 is the improved version of model 1 by rejecting the sidelobes of other spectral contributions at the main beam under consideration. Model 3 consists of sixteen elements and has three different beams. The analytical results were verified by modeling the arrays in the form of microstrip arrays in a numerical simulation with HFSS. We obtained very accurate verification. Distinctive devitations at the region ϑ<-60o and ϑ>60o originate from the radiation characteristics of microstrip antennas, which focus the energy upwards to the region around ϑ=0o.
Co-Authors Alya Patrakomala Andi Adriansyah Andi Machdani Budiyanto Husodo Dadang Fadillah Dian Widi Astuti Dwi Astuti Cahyasiwi Fadli Sirait Fina Supegina Furqan Furqan Inggis Kurnia Trisiawan Julpri Andika Kemas Nur Fuadi Melinda Utami Mudrik Alaydrus Muslim Muslim Okkie Adhie Darmawan Rachman Rachman Rizki Nugraha Hidayat Sepryanto Sepryanto Umaisaroh Umaisaroh Yugost Novanka Yuliza Yuliza