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Desain Power Amplifier Frekuensi 135 Mhz Untuk Perangkat Transmiter Vhf Dittel Portable Firmansyah, Teguh; Kuswara, Gatot; Prasetyo, Windu
Setrum : Sistem Kendali-Tenaga-Elektronika-Telekomunikasi-Komputer Vol 3, No 2 (2014): Edisi Desember 2014
Publisher : Fakultas Teknik Elektro - Universitas Sultan Ageng Tirtayasa

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Abstract

Desain Power Amplifier Frekuensi 135 Mhz Untuk Perangkat Transmiter Vhf Dittel Portable. Power amplifier (PA) merupakan komponen akhir pada bagian pemancar VHF Dittel Portable yang berfungsi untuk menguatkan sinyal yang dikirimkan dari sumber. Pada perancangan ini power amplifier dibuat untuk bekerja pada frekuensi 135 Mhz. PA yang diusulkan menggunakan Transistor Tipe Mosfet MRF 136 dengan power supply V= 30 V, VDD= 28 Vdan ID= 1.2 A agar memperoleh gain dan output power yang besar. Untuk menigkatkan coverage area komunikasi pada saat flight check calibration. Perancangan PA menggunakan L-Network dan phi- Matching digunakan sebagai rangkaian matching input dan matching output. Tipe bias transistor yang digunakan yaitu power-divider karena memiliki tingkat sensitifitas perubahan  paling rendah terhadap perubahan suhu. Hasil dari simulasi dan perhitungan yang telah dilakukan mendaptkan nilai-nilai dari spesifikasi power amplifier diperoleh nilai kestabilan > 1, gain (S21) = 20 dB, output return loss (S11) = -33.89 dB. Dengan power output sesuai dengan yang diharapkan sebesar 10 watt atau 40 dBm dan bekerja tepat pada frekuensi kerjanya 135 Mhz.
Design of Triple-Band Bandpass Filter Using Cascade Tri-Section Stepped Impedance Resonators Wibisono, Gunawan; Firmansyah, Teguh; Syafraditya, Tierta
Journal of ICT Research and Applications Vol 10, No 1 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (384.259 KB) | DOI: 10.5614/itbj.ict.res.appl.2016.10.1.4

Abstract

In this research, a triple-band bandpass filter (BPF) using a cascade tri section step impedance resonator (TSSIR), which can be operated at 900 MHz, 1,800 MHz, and 2,600 MHz simultaneously, was designed, fabricated and evaluated. Advanced Design System (ADS) was used to design and simulate the proposed BPF. The proposed BPF using cascade TSSIR was fabricated on an FR4 substrate with dielectric permittivity, substrate thickness and loss tangent at 4.3, 1.6 mm and 0.0017, respectively. The performance parameters of the proposed BPF were characterized by insertion loss, return loss, voltage standing wave ratio (VSWR) and group delay. The performance results from the simulation were compared to those of the fabricated BPF. The results showed that the performances from both the simulated and the fabricated BPF satisfied the design specifications and were in close agreement with each other. Furthermore, the results indicated that the proposed BPF using cascade TSSIR performed better than a hairpin BPF with TSSIR.
Desain Power Amplifier Frekuensi 135 Mhz Untuk Transmiter VHF Dittel Portable Firmansyah, Teguh; Kuswara, Gatot; Prasetyo, Windu
Jurnal Ilmiah Setrum (Journal of Electrical Engineering) Vol 5, No 1 (2016)
Publisher : Fakultas Teknik Elektro - Universitas Sultan Ageng Tirtayasa

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Abstract

Power amplifier (PA) is the final component in the DITTEL Portable VHF transmitter with fucuntion to amplify the signal that is sent from the source. In this paper, the power amplifier is made to work at a frequency of 135 Mhz. PA proposed using Type Mosfet transistors MRF 136 with power supply V = 30 V, VDD = 28 V and ID = 1.2 A in order to obtain the gain and output power are great. To boost the coverage area of communication at the time of check calibration flight. Design PA using L-Network and phi- Matching is used as an input matching circuit and output matching. Type bias transistor used is a power-divider because it has the sensitivity of the lowest changes to temperature changes. The results of the simulations and calculations have been carried out, the result obtained from the specification of power amplifier : stability values> 1, the gain (S21) = 20 dB, output return loss (S11) = -33.89 dB. With a power output as expected at 10 watts or 40 dBm at frequency 135 MHz.
Bandwidth and Gain Enhancement of MIMO Antenna by Using Ring and Circular Parasitic with Air-Gap Microstrip Structure Firmansyah, Teguh; Herudin, Herudin; Suhendar, Suhendar; Wiryadinata, Romi; Santoso, M Iman; Denny, Yus Rama; Supriyanto, Toto
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 15, No 3: September 2017
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (718.072 KB) | DOI: 10.12928/telkomnika.v15i3.6377

Abstract

This research was proposed a circular patch MIMO antenna by using a ring and circular parasitic radiator structure. As a novelty, in order to enhance bandwidth and gain of circular patch MIMO antenna, a conventional circular patch MIMO antenna will be added a ring and a circular parasitic. Therefore, this research was investigated a conventional MIMO antenna (C-MA), ring parasitic MIMO antenna (RP-MA), and circular parasitic MIMO antenna (CP-MA) as Model 1, Model 2, and Model 3, respectively. This MIMO antenna was designed on FR4 microstrip substrate with r= 4.4, thickness h=1.6 mm, and tan = 0.0265. This MIMO antenna has center frequency 2.35 GHz which is a frequency band for LTE application in Indonesia. An Advance Design System (ADS) software was used to determine the antenna parameters. The MIMO antenna C-MA / RP-MA/ CP-MA achieves 2.36GHz/ 2.38GHz/ 2.38 GHz, 70 MHz/ 100 MHz/ 120 MHz, 1.625 dBi/ 4.066 dBi/ 4.117 dBi, 6.414 dBi/ 7.26 dBi/ 7.153 dBi, 33.9 %/ 47.8 %/ 49.70 %, -12.35 dB/ -22.21 dB/ -23.66 dB, and -30.924 dB/ -28.46 dB/ -27.59 dB for center frequency, bandwidth, gain, directivity, efficiency, reflection coefficient, and mutual coupling, respectively. Compared to C-MA (Model1) performances, The result showed that proposed antenna has wider-bandwidth/ higher-gain with 42.8%/ 150.2 %, and 71.4%/ 163.3% for RP-MA (Model 2) and CP-MA (Model 3), respectively. The proposed antenna has size of 50 mm x 130 mm x 23.2 mm. Measured results are in a good agreement with the simulated results.
Antena Mikrostrip Rectangular Patch 1575,42 MHz dengan Polarisasi Circular untuk Receiver GPS Firmansyah, Teguh; Purnomo, Sabdo; Fatonah, Feti; Fajar Nugroho, Tri Hendarto
Jurnal Nasional Teknik Elektro dan Teknologi Informasi (JNTETI) Vol 4, No 4 (2015)
Publisher : Jurusan Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (525.435 KB) | DOI: 10.22146/jnteti.v4i4.170

Abstract

In this paper, a rectangular-shaped microstrip patch antenna at frequency 1575.42 MHz for GPS receiver applications is designed, fabricated, and evaluated. In order to produce circular polarization, dual-feed method is proposed. The dimensions of this antenna are: substrate length (Wg) 91 mm; substrate width (Lg) 90 mm; patch length (W) 62,5 mm; patch pidth (L) 47 mm; feed channel 50 Ω (w) 3,01 mm; and feed channel 100 Ω (w') 0,63 mm. The simulation result shows that at center frequency 1575,42 MHz, return loss has a value of -24.44 dB and VSWR 1,12. It was also obtained bandwidth 59 MHz with a frequency range from 1520 MHz to 1620 MHz. The antenna has a gain 3.514 dBi. The measurement results obtained VSWR 1,094 and return loss -26,998 dB. The center frequency was shift to 1574.52 MHz with VSWR 1,067 and return loss -29,566 dB. Additionally these antennas also have value in the -15 dB bandwidth of 9.3 MHz with axial ratio less than -3 dB. The axial ratio less than -3dB shows that this antenna has circular polarization.Pada makalah ini dilakukan perancangan antena mikrostrip berbentuk rectangular patch yang bekerja pada frekuensi 1575,42 MHz untuk aplikasi receiver GPS. Agar dapat menghasilkan bentuk polarisasi circular maka dilakukan perancangan menggunakan dual-feed. Antena ini memiliki dimensi berupa panjang substrat (Wg) sebesar 91 mm, lebar substrat (Lg) sebesar 90 mm, panjang patch (W) sebesar 62,5 mm, lebar patch (L) sebesar 47 mm, lebar saluran pencatu 50 Ω (w) sebesar 3,01 mm, dan lebar saluran pencatu 100 Ω (w’) sebesar 0,63 mm. Simulasi pada frekuensi tengah 1575,42 MHz menghasilkan nilai return loss -24,44 dB dan VSWR 1,12. Selain itu, didapatkan bandwidth pada -15 dB sebesar 59 MHz dengan rentang frekuensi 1520 MHz – 1620 MHz. Antena tersebut memiliki gain sebesar 3,514 dBi. Sementara, hasil pengukuran menunjukkan VSWR sebesar 1,094 dengan return loss -26,998 dB untuk frekuensi 1575,42 MHz. Namun hasil parameter terendah berada pada frekuensi 1574,52 MHz dengan VSWR 1,067 dan return loss -29,566 dB. Selain itu antena tersebut juga memiliki nilai bandwidth pada -15 dB sebesar 9,3 MHz dengan axial ratio kurang dari -3 dB. Axial ratio yang kurang dari -3dB memperlihatkan bahwa antena tersebut memiliki polarisasi yang circular.
Design and Realization of Compact Microstrip Antenna Using Fractal Sierpenski Carpet For Wireless Fidelity Application Alam, Syah; Surjati, Indra; Ferawan, Awang; Firmansyah, Teguh
Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 6, No 1: March 2018
Publisher : IAES Indonesian Section

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeei.v6i1.390

Abstract

This paper proposed new design of compact microstrip antenna using fractal sierpenski carpet method for Wireless Fidelity application at working frequency of 2400 MHz. The proposed antenna using FR4 Epoxy with (εr) of 4.3, substrate thickness (h) of 1.6 mm and loss tangent (tan δ) of 0.0265. Antenna is designed using AWR Microwave Office software.The sierpenski carpet method is used in order to reduce the dimensions of the microstrip antenna to become more compact. From the measurement results obtained reflection coefficient value -26.077 dB, VSWR 1.104 at working frequency of 2400 MHz frequency with a bandwidth of 127 MHz (2338 MHz – 2465 MHz). Beside that, by using fractal sierepenski carpet method, microstrip antenna dimension was reduced until 47.80% compared to conventional rectangular microstrip antenna.
Deteksi Tingkat Osteoporosis Pada Vertebra Spinalis Menggunakan Index-Singh Sadikin, Muhammad; Muttakin, Imamul; Wardoyo, Siswo; Firmansyah, Teguh; Nawawi, Ibrahim
PROtek Vol 4, No 1 (2017)
Publisher : Program Studi Teknik Elektro Universitas

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Abstract

Untuk mendeteksi tingkat osteoporosis biasanya dipergunakan perangkat Dual Energi X-Ray Absorptiometri (DEXA). Akan tetapi, karena harga dan biaya operasionalnya yang tinggi, maka perangkat DEXA sangat jarang dipergunakan. Untuk memberikan solusi tersebut maka pada penelitian ini dilakukan kuantisasi data dengan bantuan aplikasi perangkat lunak komputer, yang berupa algoritma pengolahan citra digital untuk meningkatkan kualitas citra (Image Enhacement), konvolusi dua dimensi, penghalusan, dan penajaman citra, serta deteksi tepian pada trabekula sinar x-ray vertebra spinal. Hasil dari penelitian ini menunjukkan metode Index Singh pada citra x-ray vertebra spinalis dapat digunakan untuk pengurutan dan pengelompokkan pixel putih dalam deteksi tingkat osteoporosis. Jumlah pixel putih pada perhitungan berdasarkan luas kolom dan baris area merupakan dari jumlah keraptan atau kepadatan dari massa tulang vertebra spinalis. Dari 50 sempel uji citra x-ray pixel putih tertinggi adalah 7.983 pixel dan pixel putih terendah adalah 5.410 pixel.
Perancangan LNA untuk Radar Automatic Dependent Surveilance-Broadcast (ADS-B) Pada Frekuensi 1090 MHz dengan Multistub Matching Wibisono, Gunawan; Firmansyah, Teguh; Ma’arang, Daverius
Setrum : Sistem Kendali-Tenaga-Elektronika-Telekomunikasi-Komputer Vol 1, No 1 (2012): Edisi Juni 2012
Publisher : Fakultas Teknik Elektro - Universitas Sultan Ageng Tirtayasa

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Abstract

Automatic Dependent Surveillance Broadcast (ADS-B) adalah perlengkapan dari sistem radar untuk menjangkau daerah yang sulit. Untuk aplikasi radar, ADS-B memerlukan LNA dengan gain dan stabilitas yang tinggi serta noise figure (NF) dan return loss yang rendah. Untuk menghasilkan LNA dengan spesifikasi yang baikpada penelitian ini akan dirancang LNA menggunakan FET transistor-NE3210S01 dengan DC bias, VDS = 2 V dan ID = 10 mA agar dapat mencapai gain yang tinggi dengan NF yang rendah. Rangkaian multi-stub impedance matching digunakan untuk menekan return loss dan VSWR. Rangkaian LNA yang dirancang dengan single-stub matching memiliki output gain (S21) = 39.726 dB, input return loss (S11) = -25.368 dB, bandwidtih = 20 MHz, NF = 0,808 dB, VSWR = 1.114 dan stability factor (K) = 4.175. Sementara itu LNA yang dirancang dengan multi-stub matching memiliki keluaran yang lebih baik, gain (S21) = 41.744 dB, input return loss (S11) = -30.014 dB, bandwidtih = 20 MHz, NF = 0778 dB, VSWR = 1.065 and stability factor (K) = 2.154.
Identifikasi Osteoporosis Pada Vertebra Spinalis Menggunakan Metode Blended Statistical-Index Singh Wiyono, Wiyono; Nugroho, Budi; Prima, Noviana; Firmansyah, Teguh; Wardoyo, Siswo
Setrum : Sistem Kendali-Tenaga-Elektronika-Telekomunikasi-Komputer Vol 7, No 1 (2018): Edisi Juni 2018
Publisher : Fakultas Teknik Elektro - Universitas Sultan Ageng Tirtayasa

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Abstract

The purpose of this research is to make osteoporosis detection aid system by utilizing x-ray image of spinal vertebra as research specimen. To improve the accuracy of the identification system, then used blended method between statistical theory and Index Singh as the determinant of osteoporosis level. This study used 50 sempel test of x-ray image of spinal vertebra obtained from RSO dr. R, Soeharso Surakarta. The completion stage of this research is done by pre-processing x-ray image, calculating the area, calculating the number of pixels, and ending by calculating statistically and comparing Index Singh. The results of this study show the representation of the area based on the highest white pixel is 7,983 pixels while the lowest is 5,410 pixels. Having done the overall testing of this system can provide accuracy of 76%.
Analisa Compact Wireless Power Transfer (CWPT) menggunakan Metode Magnetic Resonator Coupling Sudibya, Bambang; Wiyono, Wiyono; Wardoyo, Siswo; Firmansyah, Teguh
Setrum : Sistem Kendali-Tenaga-Elektronika-Telekomunikasi-Komputer Vol 5, No 2 (2016): Edisi Desember 2016
Publisher : Fakultas Teknik Elektro - Universitas Sultan Ageng Tirtayasa

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Abstract

Magnetic Resonator Coupling banyak dipergunakan untuk berbagai aplikasi Wireless Power Transfer (WPT). Pada penelitian ini berhasil dirancang WPT dengan tegangan sebesar 5 V. Jika Tx dan Rx diposisikan saling berhadapan, tegangan maksimum 4,7 volt pada jarak 1 cm. Sementara itu, jika Tx dan Rx diposisikan berdampingan, tegangan yang dihasilkan dari 3.5V.