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Design and comprehensive testing a 2.4 GHz antenna for WiFi access point Firdaus Firdaus; Afida Nurul Fatimah; Yulindon Yulindon; Ratna Dewi
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 18, No 3: June 2020
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v18i3.14940

A small size patch antenna for replacing TP-LINK WA 701 ND access point (AP) internal antena for 2.4 GHz is proposed. Measurements are carried out on AP external antenna to get the basic parameter of the antenna i.e. return loss, bandwidth, radiation pattern, and polarization. The patch antenna is designed by using IE3D simulator on FR4 material with the thickness of 1.6 mm and the dielectric constant of 4.4. The 42×28×1.6 mm overall size of the designed antenna is printed on FR 4 substrate, measured and compared to external AP antenna. The measurement result shows good agreement between simulation and designed antenna. The printed antenna covers 2.4 GHz, the gain of 2.5 dBi, and has linier polarization. This antenna is much smaller than 190×15×15 mm conventional TP-LINK WA 701 ND AP antennas and allows it to be hidden and integrated on the AP printed circuit board. The comparation of the designed antenna and external AP antenna is also conducted by evaluating both antenna performance on TP-LINK WA 701 ND AP by accessing it on a laptop on different access distance.

PENGUATAN SINYAL GLOBAL SYSTEM FOR MOBILE COMMUNICATION (GSM) MENGGUNAKAN ANTENA YAGI 14 ELEMEN Firdaus firdaus; Ratna Dewi; Rikki Vitria; Lifwarda lifwarda
Elektron : Jurnal Ilmiah Vol 4 No 2 (2012): Elektron Jurnal Ilmiah
Publisher : Teknik Elektro Politeknik Negeri Padang

The hand phone provides an easy to communicate in domestic calls or international calls. The radiation pattern of yagi antenna leads to one direction. Therefore, this antenna is selected for signal amplifier in global system of mobile communication. The design of 14 element yagi antenna which applied for signal amplification in the cell phones was conducted in this study. The design was done manually without computer software. The antenna was created using an aluminum pipe in 3/8 inch diameter for element and an aluminum beam for boom. The result showed that the operating frequency between the designed antenna and manufactured antenna are the same i.e. 947 MHz. The bandwidth of yagi antenna is 9 MHz. Moreover, the antenna gain which measured in folded antenna transmitter and BTS transmitter are 16 dB and 12 dB respectively. That result is caused differences in distance at the measurement time. Utilization of yagi antenna has succeeded to increase signal amplification in hand phone

PEMBUATAN ANTENA MIKROSTRIP MODEL ANGKA 4 UNTUK PENERIMA SINYAL TELEVISA PADA JALUR UHF (ULTRA HIGH FREKUENSI) Lifwarda lifwarda; Firdaus firdaus
Elektron : Jurnal Ilmiah Vol 5 No 2 (2013): Elektron Jurnal Ilmiah
Publisher : Teknik Elektro Politeknik Negeri Padang

Development of science and technology very rapidly in various fields brought great influence to all aspects of life one of this field of telecommunications. Development of telecommunication technology that bring due faster to hight public demand for telecommunications services users get an easy and fast service are used as medium convey information One of the device in question is antenna. Many type of antennas that have been developed for the reception of televisions signals and are generally made of wires, pipes or aluminium which has large size and weight. Needed for the antenna which has advantages in terms of shape light weight small volume from that can be easily adapted to the priimary device for on the fabrication and can be used for a wide band frequency. The antenna is microstrip antennas capable adjusted in assembly or in other words easily in a microstrip antenna placement. Microstrip antenna models 4 is designed to work in the range frequency 470 – 750 MHz. This antenna has a value of more than -10 dB returnloss to a predetermined range frequency. The measurement results of the antenna resonates at a frequency of 518 MHz gain value obtained by 1 dB, and has a wide bandwidth of 7 MHz, while for polaradiasi shaped bidirectional.

PEMBUATAN ANTENA MIKROSTRIP PHASED ARRAY DENGAN PENGATURAN FASA MENGGUNAKAN VARIASI PANJANG SALURAN CATU Firdaus firdaus
Elektron : Jurnal Ilmiah Vol 5 No 2 (2013): Elektron Jurnal Ilmiah
Publisher : Teknik Elektro Politeknik Negeri Padang

A microstrip phased array width phase is controlled by length of line feeder is presented in this paper for application in RADAR system. The microstrip array antenna is built from dipolelike individual elemen at center frequency 650 MHz. Five different length transmission lines are used to change current phase feeding in to the antenna which is 2λ, 2.125 λ, 2.025 λ, and 2.5 λ. The measured result reveal exelent agreement width the simaltions. The different length of transmission line able to change the radiation pattern which are 60o, 150o,210o dan 0o.

Proses Tracking Satelit Lapan-Tubsat Dengan Menggunakan Frekuensi S-Band Hadria Octavia; Yustini yustini; Firdaus firdaus
Elektron : Jurnal Ilmiah Vol 6 No 1 (2014): Elektron Jurnal Ilmiah
Publisher : Teknik Elektro Politeknik Negeri Padang

Satelit LAPAN-TUBSAT yang merupakan satelit mikro pertama yang dibangun LAPAN Indonesia yang bekerja sama dengan Technical University of Berlin (TU-Berlin, Jerman), hingga kini telah dapat menghasilkan gambar video daerah-daerah diwilayah Indonesia sesuai misinya yaitu sebagai satelit surveillance yang mengamati permukaan bumi. Satelit LAPAN-TUBAT ini beredar pada orbit polar, bergerak dan melingkupi seluruh daerah di Indonesia dari timur ke barat seiring dengan rotasi bumi. Untuk memanfaatkan satelit ini secara maksimal maka perlu disiapkan stasiun bumi kendali dan penerima data payload (muatan) satelit terebut. Operasi satelit LAPAN-TUBSAT yang dilakukan melingkupi 2 (dua) hal pokok yaitu operasi pengamatan kondisi kesehatan satelit dan operasi muatan satelit dalam perolehan data video. Sementara fungsi dasar operasi satelit ini melakukan fungsi Telemetri Tracking and Command (TT&C) yaitu melakukan operasi Telemetri, penjejakkan (Tracking) satelit dan operasi pengiriman data komando (Command) ke satelit untuk melaksanakan misi operasinya.

Antena Vivaldi Konvensional untuk Penerapan pada Radar Cuaca (9.4 GHz) Randhika Rianza; Uzma Septima; Ahmad Dahlan; Firdaus Firdaus; Nasrul Nasrul; Yulindon Yulindon; Yustini Yustini
Elektron : Jurnal Ilmiah Volume 14 Nomor 1 Tahun 2022
Publisher : Teknik Elektro Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/eji.14.1.236

To predict weather conditions as an anticipation act towards natural disasters, a weather radar is needed. In weather radar technology, antennas play an important role in supporting the performance of the weather radar. Vivaldi antenna is the right choice because it has an unlimited bandwidth so it is able to operate at the desired work frequency, including the working frequency of weather radar (9.4 GHz). This research discusses the modification of tapered slots, circular stub, radial stub, length and width of the reference vivaldi antenna [1] using CST Studio software. After modifications and measurements, a return loss value of -23.25336989 dB, bandwidth of 500 MHz, VSWR 1.188463357, gain of 3.99 dBi, and unidirectional radiation patterns. All the resulting antenna parameter values are in good condition and qualify the weather radar antenna for a working frequency of 9.4 GHz.

Penerapan Embedded System pada Sistem Pintar Pengendali Multi Perangkat dalam Kelas berbasis Intel Galileo dan Web Silfia Rifka; Firdaus Firdaus; Waldito Febri Ramadhan
Jurnal Rekayasa Elektrika Vol 14, No 1 (2018)
Publisher : Universitas Syiah Kuala

Smart systems are widely used in smart building, smart home, smart car, smart class, and others. The smart system in this paper is the result of research, exploit module microcontroller Intel Galileo technology and the Internet of Things (IoT) as a controller, which controlled devices connected to the system remote control from a web-based accessible via smart devices (smartphones, tablets, and laptops). Intel Galileo is a microcontroller module that combines a mini computer and Arduino is open source and supports IOT technology and the web. Web selection as a remote control in this research to facilitate system users to be able to control the system remotely by using the existing browsers on smart devices although the operating system is different. The devices controlled in this system are the LED (on-off automatically and setting the intensity of light), air conditioning (on-off automatically, temperature settings), a projector (on-off), and the IP camera (moved up, down, left and right) to monitor the room. All controlled embedded devices to facilitate the control and effective use of smart controllers resulting in a centralized system for multi-devices in the classroom to realize the smart class.

Algoritma Interpolasi Nearest-Neighbor untuk Pendeteksian Sampul Pulsa Oscilometri Menggunakan Mikrokontroler Berbiaya Rendah Firdaus Firdaus
Jurnal Rekayasa Elektrika Vol 13, No 3 (2017)
Publisher : Universitas Syiah Kuala

Non-invasive blood pressure measurement devices are widely available in the marketplace. Most of these devices use the oscillometric principle that store and analyze oscillometric waveforms during cuff deflation to obtain mean arterial pressure, systolic blood pressure and diastolic blood pressure. Those pressure values are determined from the oscillometric waveform envelope. Several methods to detect the envelope of oscillometric pulses utilize a complex algorithm that requires a large capacity memory and certainly difficult to process by a low memory capacity embedded system. A simple nearest-neighbor interpolation method is applied for oscillometric pulse envelope detection in non-invasive blood pressure measurement using microcontroller such ATmega328. The experiment yields 59 seconds average time to process the computation with 3.6% average percent error in blood pressure measurement.

Algoritma Interpolasi Nearest-Neighbor untuk Pendeteksian Sampul Pulsa Oscilometri Menggunakan Mikrokontroler Berbiaya Rendah Firdaus Firdaus
Jurnal Rekayasa Elektrika Vol 13, No 3 (2017)
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17529/jre.v13i3.8520

Non-invasive blood pressure measurement devices are widely available in the marketplace. Most of these devices use the oscillometric principle that store and analyze oscillometric waveforms during cuff deflation to obtain mean arterial pressure, systolic blood pressure and diastolic blood pressure. Those pressure values are determined from the oscillometric waveform envelope. Several methods to detect the envelope of oscillometric pulses utilize a complex algorithm that requires a large capacity memory and certainly difficult to process by a low memory capacity embedded system. A simple nearest-neighbor interpolation method is applied for oscillometric pulse envelope detection in non-invasive blood pressure measurement using microcontroller such ATmega328. The experiment yields 59 seconds average time to process the computation with 3.6% average percent error in blood pressure measurement.

Penerapan Embedded System pada Sistem Pintar Pengendali Multi Perangkat dalam Kelas berbasis Intel Galileo dan Web Silfia Rifka; Firdaus Firdaus; Waldito Febri Ramadhan
Jurnal Rekayasa Elektrika Vol 14, No 1 (2018)
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17529/jre.v14i1.9790

Smart systems are widely used in smart building, smart home, smart car, smart class, and others. The smart system in this paper is the result of research, exploit module microcontroller Intel Galileo technology and the Internet of Things (IoT) as a controller, which controlled devices connected to the system remote control from a web-based accessible via smart devices (smartphones, tablets, and laptops). Intel Galileo is a microcontroller module that combines a mini computer and Arduino is open source and supports IOT technology and the web. Web selection as a remote control in this research to facilitate system users to be able to control the system remotely by using the existing browsers on smart devices although the operating system is different. The devices controlled in this system are the LED (on-off automatically and setting the intensity of light), air conditioning (on-off automatically, temperature settings), a projector (on-off), and the IP camera (moved up, down, left and right) to monitor the room. All controlled embedded devices to facilitate the control and effective use of smart controllers resulting in a centralized system for multi-devices in the classroom to realize the smart class.

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