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Journal : Jurnal Teknik Elektro

DUAL FREQUENCY ANTENA MIKROSTRIP Surjati, Indra
Jurnal Teknik Elektro Vol 3, No 1 (2003)
Publisher : Jurnal Teknik Elektro

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Abstract

This research showed that microstrip antenna can be worked at two different frequencies.This different frequency with low frequency ratio was required as its standard, such the thirdgeneration communications UMTS (Universal Mobile Telecommunications System). Usingslot loaded two different frequencies can be achieved, f1 = 1.83 GHz and f2 = 2.07 GHz atthe feed point (16;20,5) mm with frequency ratio 1.13 and VSWR under 1.2Keywords: dual frequency, probe feed, microstrip antenna
ANALISIS PERHITUNGAN LINK BUDGET INDOOR ENETRATION WIDEBAND CODE DIVISION MULTIPLE ACCESS (WCDMA) DAN HIGH SPEED DOWNLINK PACKET ACCESS (HSDPA) PADA AREA PONDOK INDAH Surjati, Indra; Ningsih, Yuli Kurnia; Septiana, Hendri
Jurnal Teknik Elektro Vol 7, No 2 (2008)
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Abstract

The indoor penetration manifested as macro cell system which is the extension of outdoorsignalling into indoor premises, can be implemented both by High Speed Downlink PacketAccess (HSDPA) and Wideband Code Division Multiple Access (WCDMA) as well in thearea of 3.5G related application. The significant parameters being used in this researchwere Effective Isotropic Radiated Power (EIRP) and Received Signal Code Power (RSCP).The results showed that for data down linking operation the EIRP 58 dBm and the RSCP -69.94 dBm for WCDMA, while the EIRP 56 dBm and the RSCP -71.64 dBm for HSDPA.Furthermore, the drive test results showed for HSDPA running File Transfer Protocol (FTP)application the RSCP -92.2 dBm with throughput ≈2,0Mbps, while for running Hyper TextTransfer Protocol (HTTP) application the RSCP -95 dBm with throughput ≈1.9Mbps. Thedrive test result for WCDMA showed the RSCP is -69.72 dBm with throughput 328 kbps.Keywords: High Speed Downlink Packet Access (HSDPA), Wideband Code DivisionMultiple Access (WCDMA), Hyper Text Transfer Protocol (HTTP), FileTransfer Protocol (FTP)
ANALISIS SISTEM INTEGRASI JARINGAN WIFI DENGAN JARINGAN GSM INDOOR PADA LANTAI BASEMENT BALAI SIDANG JAKARTA CONVENTION CENTRE Surjati, Indra; Chandra, Henry; Prabowo, Agung
Jurnal Teknik Elektro Vol 7, No 1 (2007)
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Abstract

The research studied about designing the integration between Wireless Fidelity(WiFi) and GSM indoor network, followed by the observation of its signal quality andrelated environmental factors. To achieve the research goal, it is mandatory to calculate theEffective Isotropic Radiated Power (EIRP) and the Signal Strength (SS) for GSM network orReceived Signal Strength Indication (RSSI) for Wireless Fidelity (WiFi) network. Taking intoconsideration about the GSM and WiFi hardwares specifications, RBS power, Access Pointsand any related enviromental factors; those parameter can be definitely calculated. Theresearch results showed that for GSM indoor network the EIRP 11.9141 dBm and the SignalStrength -70.2759 dBm; while for WiFi network the EIRP 18.7524 dBm and the RSSI -37.3376 dBm with to System Operating Margin is 30.6624 dB. Furthermore it can be statedthat for obtainning the improved output signal strength as implementation of integratingboth network system, it advisable to add Multi Band Combiner altogethet with booster at theGSM network side.Keywords: WiFi, GSM Indoor, Effective Isotropic Radiated Power (EIRP), Received SignalStrength Indication (RSSI).
ANALISIS DISPERSION POWER PENALTY PADA AREA RING-1 JARINGAN LOKAL AKSES FIBER STO GATOT SUBROTO Ningsih, Yuli Kurnia; Surjati, Indra; Sunarto, Sunarto; Hardianto, Herbowo
Jurnal Teknik Elektro Vol 5, No 1 (2005)
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Abstract

Fiber attenuation caused by chromatic dispersion and modal dispersion is commonlyreferred to as a dispersion power penalty. In the wave transmitted by transmitter, dispersionoccurred, caused degradation of signal quality, so that the signal receiver is not as good aswhich is being transmitted. In this paper will be discussed about the impact of dispersionpower penalty in ring-1 STO Gatot Subroto area. Analysis was done to several factors thatcan cause dispersion power penalty, which are distance, wavelength, and data rate beingused. The calculation with available data and specification has been done, so that the routeswith the biggest and the smallest dispersion power penalty can be detected. The biggestdispersion power penalty happened in Palma Citra – Umawar route at distance of 9.387 kmwith  =1550 nm and data rate 622.08 Mbps. While the smallest was 1.221 7 10  dB,happened in Tifa – STO Gatot Subroto route at distance of 1.626 km with =1310 nm anddata rate 155.52 Mbps. All those calculations were still in permissible limit, not more than 2dB. Furthermore from some routes were obtained very small dispersion power penalty. Thebigger the fiber length and data rate, the bigger the dispersion power penalty is. Finally itcan be concluded that fiber length, wavelength, and data rate are equivalent to thedispersion power penalty.Keyword: fiber optic, dispersion, Synchronous Digital Hierarchy
KAJIAN PENERAPAN FREE SPACE OPTIC (FSO) PADA GEDUNG E DAN FG DI KAMPUS A UNIVERSITAS TRISAKTI Ningsih, Yuli Kurnia; Surjati, Indra; Danubrata, Oky
Jurnal Teknik Elektro Vol 6, No 2 (2007)
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Free Space Optics (FSO) as Data Communication System technology contribute positivelynot only to its users but also to its operators. It is regarded as the development of infraredcommunication that can overcome some drawbacks of wireless data communication such aslosses. This study concerns the implementation of Free Space Optics for cross connectedbuildings with the calculation of link margin factor to determine exactly the resultingperformance under different kinds of weather: sunny, moderate rain and heavy rain. Theresults shown are those for the distance of 35.66 m. The obtained attenuation factors are asfollows: -0.0078452 dB in sunny weather, -0.0156904 dB in light rain; and -0.1412136 dB inheavy rain. These results are still less than the link margin of 32.2228 dB, which means thatFree Space Optics is good enough to be implemented. The result also showed that for thedistance of 118.79 m, the attenuation factor is -0.4704084 dB in heavy rain and still lessthan the link margin of 22.5524 dB. It means that Free Space Optics can be implemented forline of sight communication.Keywords: Free Space Optics (FSO), link margin, weather, attenuation factor
ANALISIS PERFORMANSI JARINGAN FRAME RELAY VIRTUAL PRIVATE NETWORK Ningsih, Yuli Kurnia; Surjati, Indra; Faiq, Alfian Noor
Jurnal Teknik Elektro Vol 5, No 1 (2005)
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Abstract

Frame relay, according to its name, is a technology that depends on frames that’s beingrelayed in a data transmission. This technology is a simplified form of packet switching,similar in principle to X.25, in which synchronous frames of data are routed to differentdestinations depending on header information [Bates,2002:57]. A regular analysis on networkperformance and quality must be taken to guarantee certain service level. This task is soimportant as frame relay usually carries data on high speed data communication backbone.The performance analysis from the Frame Relay network will be discussed at the providingcompany. Performance analysis is useful to know the quality of service from the Frame relaynetwork . To analyze the quality of service from the Frame relay network can be seen from themeasurement that can affect the network. There are three measures which can affect thenetwork significantly such as bus utilization, excess burst percentage and dropped packetpercentage. Those three are closely related and having significant impact on overall framerelay’s network quality. Based on the results from the networks analyzed shows that it hasenough processing power and bandwidth resources, eventhough nearly 30% of their networkpath is under specified service level guarantee. Even so, overall quality of frame relaynetwork meets the specified service level quality.Keywords: Frame Relay, Bus Utilization, Excess Burst Percentage, Dropped PacketPercentage
ANTENA MIKROSTRIP BENTUK SEGIEMPAT Surjati, Indra
Jurnal Teknik Elektro Vol 1, No 1 (2001)
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Abstract

Patch antenna are popular for their well known attractive features, such as low profile,light weight and compatibility with monolithic microwave integrated circuits (MMIC) andmicrowave integrated circuits ( MIC ). There are many various shapes of patch antennas,such as rectangular, circular, square, triangular and ring. The simple shape isrectangular patch antenna and this paper will discuss about the rectangular patchantennaKeywords: feeding, coupling.