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Performance of Groundplane Shaping in Four-Element Dualband MIMO Antenna Pramono, Subuh; Hariyadi, Tommi; Subagio, Budi Basuki
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 15, No 1: March 2017
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v15i1.5002

Abstract

This work presents performance of groundplane shaping and its effect in four element dualband multiple input multiple output (MIMO) antenna. This proposed four element dualband MIMO antenna consists of four bowtie dipole antenna which operates at 1800 MHz (low frequency) and 2300 MHz (high frequency). This proposed four element dualband MIMO antenna occupies a 270 x 210 x  100 mm3  of FR 4 substrate. We use four types  of groundplane pattern i.e. full groundplane, cornered spatial groundplane,crossed middle groundplane, and spiral groundplane. These various grounplane patterns influence the performance of main parameters of dualband MIMO antenna. Cornered spatial groundplane pattern yields a largest bandwidth (VSWR ≤ 2) 282 MHz or 15.24% of center frequency at low frequency. Full groundplane pattern creates 135.2 MHz at high frequency. In addition, cornered spatial groundplane pattern also generates a lowest VSWR  that  is valued 1.21 at both low frequency and high frequency. The S parameters, basically both cornered spatial and full groundplane pattern produce a better return loss than two others. All four groundplane patterns deliver  equally a mutual coupling parameter.The last, this proposed four element dualband MIMO with various groundplane patterns gives a good farfield properties i.e. gain, radiation pattern, H-E field.
ROI based Indonesian Paper Currency Recognition Using Canny Edge Detection Rauyani, Ahmad Imam; Ibrahim, Muhammad Hamka; Pramono, Subuh
Journal of Electrical, Electronic, Information, and Communication Technology Vol 2, No 1 (2020): JOURNAL OF ELECTRICAL, ELECTRONIC, INFORMATION, AND COMMUNICATION TECHNOLOGY
Publisher : Universitas Sebelas Maret (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jeeict.2.1.41349

Abstract

Paper currency recognition is important for automatic payment system. The paper performs a nominal paper detection process using image processing with canny method implemented in python programming language. The canny method is used to find edge features in the nominal currency. By using template matching of image reference, region of interest (ROI) of nominal value is extracted so that it can be used in any orientation of  paper currency image. The ROI of nominal image is processed by canny edge method and spatial transformation to strengthen the image features and being processed by template matching to decide nominal currency. The study has successfully tested nominal value of 1000, 2000, 5000, 10000, 20000, 50000, and 100000 Indonesia banknotes which then the currency value will appear in the value variable in python.
The Development Of Web-based Outcome Based Education Information System Safiudin, Adip; ., Sutrisno; Sulistyo, Meiyanto Eko; Pramono, Subuh; Ramelan, Agus
Journal of Electrical, Electronic, Information, and Communication Technology Vol 2, No 2 (2020): JOURNAL OF ELECTRICAL, ELECTRONIC, INFORMATION, AND COMMUNICATION TECHNOLOGY
Publisher : Universitas Sebelas Maret (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jeeict.2.2.45291

Abstract

The development of Outcome Based Education (OBE) Information System is done as a solution to academic problems related to the achievement of graduate learning for students. In addition, the OBE system is a form of effort to improve academic quality in order to be able to monitor and measure the development of student learning outcomes in a college study program. The Outcome Based Education system includes all grades processing based on Course Learning Outcomes which is related to Graduates Learning Outcomes so that the outcomes of each student can be measured. This information system is developed by the Rapid Application Development method, and uses the Yii2 Framework with the concept of MVC (Model, View, Controller) where system programming is separated based on application components, such as: manipulating data, controllers, and user interfaces. The use of the RAD method and the Yii2 Framework in making applications can be done quickly and in a structured manner making it easier for future developments. The developed system has been successfully tested and applied in the Electrical Engineering Study Program, Civil Engineering Study Program and Mechanical Engineering Study Program, and planned to be implemented in all study programs of the Faculty of Engineering, Sebelas Maret University. This information system can be applied not only in the engineering faculty of Sebelas Maret University but also outside the university which requires an information system to measure the learning outcomes of graduates.
Analysis of Triple Quantum Dots Single Electron Transistor (TQD-SET) for Various Configuration Hanurjaya, Stephanus; Anwar, Miftahul; Sulistyo, Meiyanto Eko; Iftadi, Irwan; Pramono, Subuh
Journal of Electrical, Electronic, Information, and Communication Technology Vol 2, No 2 (2020): JOURNAL OF ELECTRICAL, ELECTRONIC, INFORMATION, AND COMMUNICATION TECHNOLOGY
Publisher : Universitas Sebelas Maret (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jeeict.2.2.44840

Abstract

Single electron transistor (SET) has high potential for the development of quantum computing technologies in order to provide low power consumption electronics. For that purpose, many studies have been conducted to develop SET using dopants as quantum dots (QD). The working principle of SET basically is a single electron tunneling one by one through tunnel junction based on the coulomb blockade effect. This research will simulate various configurations of triple quantum dots single electron transistors (TQD-SET) using SIMON 2.0 with an experimental approach of MOSFET with dopants QD. The configurations used are series, parallel, and triangle configuration. The mutual capacitance (Cm), tunnel junctions (TJ), and temperature values of TQD-SET configurations are varied. The I-V characteristics are observed and analyzed for typical source-drain voltage (Vsd). it is found that the TQD series requires larger Vsd than parallel or triangular TQDs. On the other hands, the current in parallel TQD tends to be stable even though Cm is changed, and the current in the TQD triangle is strongly influenced by the Cm. By comparing these three configurations, it is observed that the tunnelling rate is higher for parallel TQD due to higher probability current moves through three dots by applying Vds.
Kinerja Precoding pada Downlink MU-MIMO Pramono, Subuh
JTET (Jurnal Teknik Elektro Terapan) Vol 2, No 3 (2013)
Publisher : Teknik Elektro - Politeknik Negeri Semarang

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Abstract

Multiuser pada downlink MU MIMO mengakibatkan multiuser interference (MUI). Precoding linier merupakan salah satu bagian dari sistem transmiter untuk mengatasi MUI tersebut. Pengurangan MUI melalui pemilihan matrik precoding yang orthogonal untuk user 1 dengan user lainnya. Penerapan precoding mensyaratkan informasi channel state indicator ditransmiter yang didapat dari feedback yang dikirim user. Informasi CSI yang didapat akan memberikan informasi mengenai kondisi kanal saat itu, Selain itu, CSI melalui informasi MCS akan memberikan level modulasi dan coding yang optimal untuk menghasilkan kapasitas yang optimal. Linier precoding meningkatkan kinerja bit error rate dan menaikan kapasitas sistem. MMSE menghasilkan kinerja dan kapasitas terbaik dibanding BD dan SO. MMSE dengan BER 10 -4 menghasilkan precoding gaining ± 1,5 dB terhadap BD dan ± 2,3 dB terhadap SO. Untuk SNR 8 dB, MMSE menghasilkan kapasitas ± 7,5 b/Hz/s.
Kinerja Modulasi dan Coding Rate Adaptif pada Physical Layer Long Term Evolution Pramono, Subuh
JTET (Jurnal Teknik Elektro Terapan) Vol 2, No 1 (2013)
Publisher : Teknik Elektro - Politeknik Negeri Semarang

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Abstract

Layer fisik LTE (E-UTRAN) mendukung link adaptation, skema transmisi untuk menjaga throughput dan drop rate dengan merubah jenis modulasi dan code rate yang dinamis berdasar kondisi kanal. Perubahan modulasi dan code rate didasarkan nilai channel quality indicator (CQI) feedback dari user ke Node B. Penelitian ini menggunakan modulasi QPSK,16 QAM,64 QAM dan code rate channel coding 1/2, 1/3. Orde modulasi yang lebih tinggi digunakan pada saat nilai CQI besar atau SNR kanal bagus. Hasil penelitian menunjukkan, kinerja modulasi orde rendah(QPSK) menghasilkan kinerja bit error rate (BER) sistem lebih baik, akan tetapi efisiensi yang dihasilkan rendah, sedangkan modulasi orde tinggi(64 QAM) menghasilkan kinerja yang sebaliknya. Code rate 1/3 menghasilkan kinerja BER sistem lebih baik dibanding code rate 1/2, kemampuan deteksi dan koreksi error lebih baik. Penentuan jenis/orde modulasi dan code rate yang optimal pada kanal rayleigh flat fading menghasilkan kinerja BER sistem yang maksimal.
Analisa Perencanaan Power Link Budget untuk Radio Microwave Point to Point Frekuensi 7 GHz (Studi Kasus : Semarang) Pramono, Subuh
JTET (Jurnal Teknik Elektro Terapan) Vol 3, No 1 (2014)
Publisher : Teknik Elektro - Politeknik Negeri Semarang

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Abstract

Penelitian ini fokus perencanaan radio microwave 7 GHz untuk komunikasi radio point to point. Komunikasi radio pada jaringan backbone pada sistem seluler menggunakan microwave/frekuensi tinggi, hal ini didasari pada traffic rate yang tinggi pada jaringan backbone tersebut. Frekuensi tinggi mampu menyediakan bandwidth yang lebar untuk traffic rate tinggi. Pada sisi lain, dengan kondisi jaringan backbone dengan traffic rate yang tinggi perlu perencanaan radio link-power link budget yang optimal untuk menjaga realibility dengan tetap menjaga kondisi line of sight (LOS). Perencanaan ini untuk link yang menghubungkan site transmitter (07 o 02’ 36,64’’ LS :110 o 25’ 24,33”BT), 250 m ASL dan site receiver (06 o 59’ 00,55’’LS : 110 o 26’ 52,62”BT), 10 ASL. Dengan keuntungan site transmitter di posisi goegrafis tinggi (250 m ASL), perancangan, untuk BER 10 -3 didapat received signal level (RSL) -30,55 dBm, 44,45 dB lebih tinggi dari daya threshold -75,00 dBm. Kondisi fresnel area ke-1 (F1) yang clearance mendukung tercapainya kondisi line of sight jaringan backbone. (07 o 02’ 36,64’’ LS :110 o 25’ 24,33”BT), 250 m ASL dan sitereceiver (06 o 59’ 00,55’’LS : 110 o 26’ 52,62”BT), 10 ASL
Rancang Bangun Antena Microstrip Array 2x2 Frekuensi 2300 MHz Pramono, Subuh
JTET (Jurnal Teknik Elektro Terapan) Vol 3, No 2 (2014)
Publisher : Teknik Elektro - Politeknik Negeri Semarang

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Abstract

Perkembangan teknologi telekomunikasi dan informasi serta berkembangnya jenis layanan telekomunikasi yang begitu cepat mendorong pengimplementasian teknologi telekomunikasi nirkabel pita lebar (broadband). Penetrasi broadband sebesar 10%, akan meningkatkan GDP 1,38% di negara berkembang.Untuk setiap 1% kenaikan penetrasi broadband, lapangan kerja bertambah 0,2%-0,3%. Penerapan telekomunikasi seluler LTE frekuensi 2300 MHz sangat mendukung komunikasi broadband, akan tetapi dengan frekuensi yang cukup tinggi menjadikan coverage area semakin kecil dan tantangan redaman propagasi semakin besar, sehingga dibutuhkan infrastruktur yang lebih handal, salah satunya antena array. Dimulai dari perancangan yang disimulasi software, pabrikasi dan pengukuran. Penelitian antena lungs microstrip array 2 x 2 menghasilkan parameter yang baik : spektrum frekuensi 2350 – 2400 MHz, standing wave ratio (SWR) 1,158 , S 11 -27,71 dB, gain / penguatan sekitar 13 dBi, bandwidth (SWR < 2) sekitar ± 50 MHz.
Kinerja Sinyal Referensi Long Block dan Short Block pada Single Carrier – Frequency Division Multiple Access (SC-FDMA) Uplink Long Term Evolution (LTE) Pramono, Subuh
JTET (Jurnal Teknik Elektro Terapan) Vol 1, No 1 (2012)
Publisher : Teknik Elektro - Politeknik Negeri Semarang

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Abstract

Sinyal referensi berfungsi sebagai sinyal pilot untuk mengetahui kondisi kanal, sinyal ini sebagai umpan balik pada arah uplink. Sinyal referennsi terdiri atas 2 jenis, long block dan short block. Tipe long code terdapat 1 kali dalam 1 periode time slot (0.5ms), sedangkan tipe short block terdapat 2 kali dalam 1 periode time slot. Hasil simulasi menunjukkan sinyal referensi tipe short block menghasilkan perbaikan sistem untuk user bergerak dengan kecepatan tinggi (150 km/jam)-dengan doppler spread besar (263,9 Hz),terutama pada block error rate. Sistem dengan Block Error Rate (BER) 10-2 dan modulasi 16QAM, short block memberikan perbaikan ±2 dB dibandingakan long block, sedangkan dengan level modulasi lebih rendah-QPSK, short block hanya memberikan perbaikan ±1 dB dibandingkan long block. Dengan periode kemunculan yang lebih sering dalam 1 periode time slot, tipe short code memberikan informasi umpan balik kondisi kanal lebih sering.
Analisa Empiris Voltage Standing Wave Ratio (VSWR) dan Distance to Fault (DTF) pada Feeder Base Transceiver Station GSM 900 MHz Pramono, Subuh
JTET (Jurnal Teknik Elektro Terapan) Vol 3, No 3 (2014)
Publisher : Teknik Elektro - Politeknik Negeri Semarang

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Abstract

Penelitian ini fokus membahas secara empiris hasil implementasi pengukuran VSWR (voltage standing wave ratio) dan DTF (Distance to Fault) pada salah satu site BTS GSM 900 MHz dengan frekuensi uplink 890 – 915 MHz dan downlink 935 – 960 MHz dengan panjang feeder 50 meter. Pengukuran dilakukan dengan menggunakan site master. Sistem pemancar/transmitter harus didukung subsistem feeder dan subsistem antena yang optimal untuk menghasilkan EIRP (equivalent isotropic radiated power) yang besar menghasilkan jarak jangkauan yang jauh. Nilai VSWR yang rendah (dibawah VSWR threshold 1,04) menandakan gelombang yang dipantulkan kembali sangat kecil. Hasil pengukuran setelah adanya perbaikan konektor dan feeder menunjukan keseluruhan VSWR pada range frekuensi 890 – 960 MHz dibawah VSWR threshold, yaitu antara 1,03 – 1,005 dengan prosentase daya pantul antara 0,022 % - 0,000625 % sedangkan VSWR threshold menghasilkan prosentase daya pantul sebesar 0,038%.