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31,458 Article Results

2.45 GHz rectenna with high gain for RF energy harvesting

10.12928/telkomnika.v17i1.11592
Maizatul Alice Meor; Universiti Teknikal Malaysia Melaka (UTeM) Said , Zahriladha; Universiti Teknikal Malaysia Melaka (UTeM) Zakaria , Mohd Nor; Universiti Teknikal Malaysia Melaka (UTeM) Husain , Mohamad Harris; Universiti Teknikal Malaysia Melaka (UTeM) Misran , Faza Syahirah Mohd; Universiti Teknikal Malaysia Melaka (UTeM) Noor
This paper presents a high gain rectenna at 2.45 GHz. Two layers low cost FR4 substrate has been used with air-gap technology for this fabricated rectenna. The proposed designs contain antenna and  open stub rectifying circuits with feedline. With the dimension of 100 x 100 x 5 mm3, this rectenna can perform high gain. The technique of air gap approach has been used for this proposed rectenna design so as to increase the antenna gain. Second and third harmonics has been eliminated by the introducing of triangular slot and ground plane to the developed design. The proposed rectenna successfully achieved the output voltages reaches 0.46 V when the input power is 0 dBm respectively when  the input power range is between -25 to 30 dBm. It is also can reach up to 6V when the maximum input power is applied. High gain, simple design, low profile and easy integration are the main advantages of this design of the rectenna when compared to past researchers.
Volume: 17
Issue: 1
Page: 384-391
Publish at: 2019-02-01

PVPF tool: an automatedWeb application for real-time photovoltaic power forecasting

10.11591/ijece.v9i1.pp34-41
Mohammad H. Alomari , Jehad Adeeb , Ola Younis
In this paper, we propose a fully automated machine learning based forecasting system, called Photovoltaic Power Forecasting (PVPF) tool, that applies optimised neural networks algorithms to real-time weather data to provide 24 hours ahead forecasts for the power production of solar photovoltaic systems installed within the same region. This system imports the real-time temperature and global solar irradiance records from the ASU weather station and associates these records with the available solar PV production measurements to provide the proper inputs for the pre-trained machine learning system along with the records’ time with respect to the current year. The machine learning system was pre-trained and optimised based on the Bayesian Regularization (BR) algorithm, as described in our previous research, and used to predict the solar power PV production for the next 24 hours using weather data of the last five consecutive days. Hourly predictions are provided as a power/time curve and published in real-time at the website of the renewable energy center (REC) of Applied Science Private University (ASU). It is believed that the forecasts provided by the PVPF tool can be helpful for energy management and control systems and will be used widely for the future research activities at REC.
Volume: 9
Issue: 1
Page: 34-41
Publish at: 2019-02-01

Energy scavenging using vibrations from bluetooth controlled DC motor

10.12928/telkomnika.v17i1.11638
Ankita H; Shri Ramdeobaba College Harkare , Sagar; Shri Ramdeobaba College Welekar , Abhishek; Shri Ramdeobaba College Maheshwari , Suraj; Shri Ramdeobaba College Motwani , Saket; Shri Ramdeobaba College Soholkar
Wide spectrum of research for application-based solutions has grown due to the requirement of automation of general electrical appliances. A low-cost solution is presented in this paper to control DC motor using Bluetooth module and controlled by an ARM processor. The main objective here is to build an efficient closed loop system which is wirelessly controlled by ARM processor 2103 using Bluetooth module and Bluetooth dongle. The system suggested here is expandable and can be integrated with latest technologies as well. The paper gives the details of the prototype for home automation system and gives the expected results with 0.1% tolerance. It also suggests the ways to integrate this system with the mobile phones and hence control the devices with the mobile handsets. The vibration frequency of the DC motor is used to generate electrical potential using MEMS tecnonlogy. A novel idea of self powered DC motor is thus presented by installing MEMS based energy harvester on the motor shaft.
Volume: 17
Issue: 1
Page: 481-488
Publish at: 2019-02-01

Integration of internet of things with wireless sensor network

10.11591/ijece.v9i1.pp439-444
vandana reddy , Gayathri P
The Internet of things (IoT) is a major source for technology solutions in many industries. The IoT can consider, Wireless Sensor Network (WSN) as the backbone network to reduce formation or advent of new technology. Integration of these would reduce the burden and form smart sensor node network with nodes given access to internet. WSN is already a major legacy system that has percolated into many industries. Thus by integration of IoT and WSN no huge paradigm shift is needed for the industries.
Volume: 9
Issue: 1
Page: 439-444
Publish at: 2019-02-01

Optimization of video quality via fuzzy logic base adaptive media playout

10.11591/ijeecs.v13.i2.pp527-533
Farij Ehtiba , Badlishah Ahmad , Mostafijur Rahman
This paper addresses the issue of interruption of Virable Bit Rate (VBR) video streaming over IP network, due to channel quality fluctuation. Specifically, a Fuzzy Logic (FL) Control principle is fused with Adaptive Media Playout (AMP) control to estimate an appropriate playout frame rate, namely FLAMP. Based on the estimation of the playout frame rate, the FLAMP algorithm adjusts the consumption rate smoothly to avoid video stream degradation. Simulation results validate that the FLAMP scheme efficiently reduces the buffer outage probability and provides better visual quality where FLAMP gives 26.5% less ferquence of playout interruption, and 21.6% less variance of distortion of playout as compared to APTA.
Volume: 13
Issue: 2
Page: 527-533
Publish at: 2019-02-01

Research, design and fabrication of a microwave active filter for nanosatellite’s receiver front-ends at s-band

10.12928/telkomnika.v17i1.10079
Linh Ta; Ministry of Science and Technology Phuong , Bernard; ENS Paris-Saclay Journet , Duong Bach; VNU University of Engineering and Technology Gia
In satellite technology, the communication between space segment and ground segment plays a vital role in the success of the mission. This paper is targeted at study, design and fabrication of a microwave active filter for the receiver front-ends using coupled line filter structure, which can be applied to the nanosatellite’s communication subsystem. The whole active filter module is a combination of a microstrip bandpass filter and a preceding two-stage wideband low noise amplifier using FET devices. The proposed module operates in the frequency range of 2-2.4 GHz, which can be divided to 10 frequency slots of about 40 MHz for each. These frequency slots will be used for the S-band multi-frequency receiving function of the ground station, as well as the nanosatellite. The simulated and measured results of this active filter configuration are presented.
Volume: 17
Issue: 1
Page: 23-31
Publish at: 2019-02-01

High gain 5G MIMO antenna for mobile base station

10.11591/ijece.v9i1.pp468-476
Yusnita Rahayu , Indah Permata Sari , Dara Incam Ramadhan , Razali Ngah
This article presented a millimeter wave antenna which operated at 38 GHz for 5G mobile base station. The MIMO (Multiple Input Multiple Output) antenna consisted of 1x10 linear array configurations. The proposed antenna’s size was 88 x 98 mm^2  and printed on 1.575 mm-thick Rogers Duroid 5880 subsrate with dielectric constant of ε_r= 2.2 and loss tangent (tanδ) of 0.0009. The antenna array covered along the azimuth plane to provide the coverage to the users in omnidirection. The simulated results showed that the single element antenna had the reflection coefficient (S11) of -59 dB, less than -10 dB in the frequency range of 35.5 - 39.6 GHz. More than 4.1 GHz of impedance bandwidth was obtained. The gain of the antenna linear array was 17.8 dBi while the suppression of the side lobes was -2.7 dB.  It showed a high array gain throughout the impedance bandwidth with overall of VSWR were below 1.0646. It designed using CST microwave studio.
Volume: 9
Issue: 1
Page: 468-476
Publish at: 2019-02-01

Generating similarity cluster of Indonesian languages with semi-supervised clustering

10.11591/ijece.v9i1.pp531-538
Arbi Haza Nasution , Yohei Murakami , Toru Ishida
Lexicostatistic and language similarity clusters are useful for computational linguistic researches that depends on language similarity or cognate recognition. Nevertheless, there are no published lexicostatistic/language similarity cluster of Indonesian ethnic languages available. We formulate an approach of creating language similarity clusters by utilizing ASJP database to generate the language similarity matrix, then generate the hierarchical clusters with complete linkage and mean linkage clustering, and further extract two stable clusters with high language similarities. We introduced an extended k-means clustering semi-supervised learning to evaluate the stability level of the hierarchical stable clusters being grouped together despite of changing the number of cluster. The higher the number of the trial, the more likely we can distinctly find the two hierarchical stable clusters in the generated k-clusters. However, for all five experiments, the stability level of the two hierarchical stable clusters is the highest on 5 clusters. Therefore, we take the 5 clusters as the best clusters of Indonesian ethnic languages. Finally, we plot the generated 5 clusters to a geographical map.
Volume: 9
Issue: 1
Page: 531-538
Publish at: 2019-02-01

The design of smart notification on android gadget for academic announcement

10.12928/telkomnika.v17i1.10245
Agustina; Universitas Indo Global Mandiri Heryati , Evi; Universitas Indo Global Mandiri Yulianti , Faradillah; Universitas Indo Global Mandiri Faradillah , Dewi; Universitas Indo Global Mandiri Sartika , Dhamayanti; Universitas Indo Global Mandiri Dhamayanti , Imelda; Universitas Indo Global Mandiri Saluza , Ahmad; Universitas Indo Global Mandiri Sanmorino
In this article, we try to design the architecture of a smart notification system using an Android gadget for academic notification in college. Academic notification in colleges now utilizes bulletin boards and online media such as websites or social media. The problem faced is the high cost and resources required to deliver the academic notification. Another problem is whether the information delivered can be right to the students who need it. We proposed the architecture of a smart notification system that can reduce the cost, and the information delivered can be right on target to the students in need.
Volume: 17
Issue: 1
Page: 147-152
Publish at: 2019-02-01

The influence of sampling frequency on tone recognition of musical instruments

10.12928/telkomnika.v17i1.11608
Linggo; Sanata Dharma University Sumarno , Kuntoro; Sanata Dharma University Adi
Sampling frequency of musical instruments tone recognition generally follows the Shannon sampling theorem. This paper explores the influence of sampling frequency that does not follow the Shannon sampling theorem, in the tone recognition system using segment averaging for feature extraction and template matching for classification. The musical instruments we used were bellyra, flute, and pianica, where each of them represented a musical instrument that had one, a few, and many significant local peaks in the Discrete Fourier Transform (DFT) domain. Based on our experiments, until the sampling frequency is as low as 312 Hz, recognition rate performance of bellyra and flute tones were influenced a little since it reduced in the range of 5%. However, recognition rate performance of pianica tones was not influenced by that sampling frequency. Therefore, if that kind of reduced recognition rate could be accepted, the sampling frequency as low as 312 Hz could be used for tone recognition of musical instruments.
Volume: 17
Issue: 1
Page: 253-260
Publish at: 2019-02-01

Microstrip antenna with DGS based on CSRR array for WiMAX applications

10.11591/ijece.v9i1.pp157-162
Ajay V. G. , Parvathy A. R. , Thomaskutty Mathew
This paper reports a novel method for designing a miniaturized microstrip antenna with DGS based on CSRR array which operates in the frequency of 2.6GHz for low band WiMAX application. The proposed antenna is designed using ANSYS HFSS simulation software. The antenna with optimized parameters is fabricated using FR-4 substrate of thickness 1.6 mm. The simulated and measured performances of the antenna in terms of return loss, directivity and radiation patterns are presented in this work. When Complimentary Split Ring Resonators (CSRRs) array are placed on the ground plane, the resonant frequency is shifted  to a lower value and patch size is reduced .The measurements were taken and compared with the simulated results. The performance characteristics obtained from the measurements show that the proposed antenna is suited for WiMAX application at 2.6GHz.
Volume: 9
Issue: 1
Page: 157-162
Publish at: 2019-02-01

Bistatic configurational analysis of ultra-wideband antenna for detection applications

10.11591/ijeecs.v13.i2.pp702-707
Jawab Ali , Noorsaliza Abdullah , Roshayati Yahya , Ezri Mohd , Ariffuddin Joret , Norshidah Katiran
With the advancement in technology, antennae are becoming a popular components to be used in various applications. Following the trend, a compact design of ultra-wideband (UWB) bistatic configuration of the antenna is presented in this paper using ground penetrating radar (GPR) technology specifically for detection applications. The antenna is first designed and simulated using defected ground structure (DGS) for impedance bandwidth with the obtained gain of around 6.2 dB and return losses from 3-16 GHz. Later the complete detection model is aimed to study and for this purpose CST is used to model human skin and performed an experiment based on antennas i.e. transmitter and receiver, obstacle and target, to study and analyze the received antenna reflections for detection purpose.
Volume: 13
Issue: 2
Page: 702-707
Publish at: 2019-02-01

Speed limiter integrated fatigue analyzer (SLIFA): engineering design and concept

10.12928/telkomnika.v17i1.8249
Hadi; Mercubuana University Pranoto , A.M.; University Tun Hussein Onn Malaysia [UTHM] Leman , Fajar; Mercubuana University Anggara , Muhammad; Mercubuana University Kholil
Main issue in urban transportation system is traffic accident which caused by several factors where there are two factors that has a significant contribution in accident are overspeed and fatigue. Therefore, main objective of this research is to develop Speed Limiter Integrated Analyzer (SLIFA). This device will be controlling the speed by cutting off the fuel supply to the engine when driver's fatigue or speed are beyond limitation. This research was consists of four steps which are Step 1 is study literature on types of vehicle. Step 2, detail engineering design that is focused in this research. Step 3 is describing the target of SLIFA installation. Step 4 is fabricating and testing of SLIFA on truck and bus in range of July 2017 to January 2018. The result shows the appropriate voltage for speed at 70 km/h is 10.7 volt for limiting the speed. The traffic accident has succesfully decreased up to 47% after SLIFA installed on truck and bus. It can be concluded that the SLIFA application on transportation especially on truck and bus was very recommended to reduce traffic accident and play an appropriate government regulation.
Volume: 17
Issue: 1
Page: 508-520
Publish at: 2019-02-01

Design and fabrication of A Ku-band low noise amplifier using FR-4 substrate

10.12928/telkomnika.v18i1.13196
Linh; Ministry of Science and Technology Ta Phuong , Bernard; LPQM (CNRS UMR-8537) École normale supérieure Paris-Saclay, CentraleSupelec, Université Paris-Saclay, France Journet , Duong; VNU University of Engineering and Technology Bach Gia
The low noise amplifier (LNA) plays an important role in many communication systems, especially at the receiver’s front-ends. In modern RF designs, The LNA is usually fabricated on a microstrip printed circuit board (PCB) due to its simplicity and ability of integrating flexibly with other components in a receiving circuitry unit. At frequencies lower than 6 GHz, the most prevalent substrate material for a microstrip LNA is FR-4 while at higher frequencies of over 10 GHz, it is challenging to design the LNA using this material without causing considerable losses to the RF signal. There are many works related to design microstrip LNA at high frequencies, however, the dielectric substrates used in most of them were high-cost materials for low dielectric loss. This paper introduces an LNA topology using the common, low-cost FR-4 substrate which can be operated in Ku-band for applications such as small satellites’ receivers, with the expected noise figure of lower than 1 dB, gain of around 10 dB and the return loss of around -10 dB. The stepped impedance matching technique has been used for transmission line optimization. The simulated and measured results are presented.
Volume: 18
Issue: 1
Page: 552-561
Publish at: 2019-02-01

Blood image analysis to detect malaria using filtering image edges and classification

10.12928/telkomnika.v17i1.11586
Murk Hassan; Mehran University Memon , Tariq Jamil Saifullah; Mehran University Khanzada , Sheeraz; Mehran University Memon , Syed Raheel; King Abdulaziz University Hassan
Malaria is a most dangerous mosquito borne disease and its infection spread through the infected mosquito. It especially affects the pregnant females and Children less than 5 years age. Malarial species commonly occur in five different shapes, Therefore, to avoid this crucial disease the contemporary researchers have proposed image analysis based solutions to mitigate this death causing disease. In this work, we propose diagnosis algorithm for malaria which is implemented for testing and evaluation in Matlab. We use Filtering and classification along with median filter and SVM classifier. Our proposed method identifies the infected cells from rest of blood images. The Median filtering smoothing technique is used to remove the noise. The feature vectors have been proposed to find out the abnormalities in blood cells. Feature vectors include (Form factor, measurement of roundness, shape, count total number of red cells and parasites). Primary aim of this research is to diagnose malaria by finding out infected cells. However, many techniques and algorithm have been implemented in this field using image processing but accuracy is not up to the point. Our proposed algorithm got more efficient results along with high accuracy as compared to NCC and Fuzzy classifier used by the researchers recently.
Volume: 17
Issue: 1
Page: 194-201
Publish at: 2019-02-01
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