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Antenna Multiple Input Multiple Output Four Port Using Methods Stub and Defected Ground Structure for Ultra wide-band Applications Denisa Putri Maharani; Yustini, Yustini
International Journal of Wireless And Multimedia Communications Vol. 2 No. 2 (2025): International Journal of Wireless And Multimedia Communications
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62671/jowim.v2i2.142

Abstract

Abstract— Multiple Input Multiple Output (MIMO) antennas using the Defected Ground Structure technique are able to produce wide bandwidth to meet Ultra Wide-Band (UWB) frequencies. UWB MIMO antennas have the advantages of reducing interference, improving isolation, and optimizing multipaths, thereby expanding coverage and improving signal quality. The challenge in designing MIMO-UWB antennas is to produce low mutual coupling with small antenna dimensions so that they can be used in portable devices. In this final project, the aim is to design a 4x4 UWB MIMO antenna using FR-4 substrate material with a dielectric constant (εr) of 4.3, a loss tangent of 0.035 and a material thickness of 1.6 mm. With dimensions of 45 x 45 x 1.6 ,mm-3. which has an Ultra-Wideband working frequency with a frequency range of 3.1 – 10.6 GHz. The results of the antenna simulation and measurement showed good performance with a simulated antenna operating frequency of 3.1–10.23 GHz, a minimum return loss of -49.85 dB, an isolation of ≤ -20 dB, and a maximum peak gain of 3.3 dBi at the frequency of 10.6 GHz with an omnidirectional radiation pattern. The measurement results show a working frequency of 3.2-10.64 GHz, a minimum return loss of -21.24 dB, and an Isolation of ≤ -20 dB. The designed four-port MIMO antenna parameters result in a simulated ECC and measurement < of 0.02 and a diversity gain of over 9.989, and a TARC of ≤ –10 dB. The measurement and simulation results show a good fit and are within the permissible limits, indicating good performance for UWB communication.    
Effect of Coiling and Macrobending on Fiber To The Building (FTTB) Network Activation Yustini, Yustini; Nasrul, Nasrul; Asril, Aprinal Adila; Nugraha, Bintang Aulia
Brilliance: Research of Artificial Intelligence Vol. 4 No. 2 (2024): Brilliance: Research of Artificial Intelligence, Article Research November 2024
Publisher : Yayasan Cita Cendekiawan Al Khwarizmi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47709/brilliance.v4i2.4674

Abstract

Fiber to the Building (FTTB) provides a fast and efficient service. However, the network quality may be affected by high attenuation at the termination (ONU) due to coiling, macrobending, and the length of patch cords, impacting network stability. This study aims to measure and analyze the effect of coiling and macrobending on patch cord cables of different lengths, as well as their influence on attenuation and FTTB network performance. The method includes simulating patch cord cables with lengths of 3m, 5m, and 10m. The tested treatments include conditions without coil, with coil, macrobending without coil, and macrobending with coil applied to the final termination before and after activating the FTTB network. Before activation, the lowest attenuation was 19.78 dB in the 3m cable without coil and macrobending, while the highest attenuation was 21.93 dB in the 10m cable with 5 coils (6cm curvature) and macrobending (0.8cm diameter). After activation, the lowest attenuation was 19.74 dB in the 3m cable without coil and macrobending, while the highest attenuation was 23.92 dB in the 10m cable with 5 coils (6cm curvature) and macrobending (0.8cm diameter). The test results show that the attenuation is affected by the number of coils, macrobending, and cable length.Damping increases with an increase in coils, cable length, and macrobending.
Fiber to the home (FTTH) activation system and analysis of dropcore cable connection losses on optical network performance Asril, Aprinal Adila; Maria, Popy; Yustini, Yustini; setiawan, Herry; Nasrul, Nasrul
Brilliance: Research of Artificial Intelligence Vol. 4 No. 1 (2024): Brilliance: Research of Artificial Intelligence, Article Research May 2024
Publisher : Yayasan Cita Cendekiawan Al Khwarizmi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47709/brilliance.v4i1.3815

Abstract

The FTTH network is currently a reliable network concept used in an era where very fast access to information is needed as it is today, but several problems arise in the FTTH network, for example, reduced data transmission speed due to losses in the transmission cable connection or drop core. In this study, activation of the FTTH network will be carried out so that it can function for internet data transmission and observations will also be made of the connection losses on the 10-meter dropcore cable with the number of connections respectively, namely no connection, 1 connection, and 2 connections, where each connection obtains connection losses from 0.00 to 0.02 dB which will affect the total attenuation obtained in the activated FTTH network. Standard attenuation for fiber optic network activation starting from OLT to ONT according to IEEE Std 802.3ah states that the permissible attenuation / loss tolerance is between 20-24 to 29 dB. Splicing losses are caused by errors in the process of joining the fiber optic cable cores. The number of connections in a fiber optic cable can affect the attenuation value in the fiber optic cable. The more connections, the higher the attenuation in the fiber optic cable.
Link Budget Site Planning in Kuranji Region Andalas University - Mount Sarik Cania, Marisa; Chandra, Dikky; Yustini, Yustini
International Journal of Wireless And Multimedia Communications Vol. 1 No. 2 (2024): International Journal of Wireless And Multimedia Communications
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62671/jowim.v1i2.21

Abstract

Link budget is a way to calculate all parameters in signal transmission, ranging from gain and loss from the transmitter to the receiver via transmission media. This design is motivated by planning at PT. Alita Praya Mitra for site development in Kuranji region – University Andalas (UNAND) – Gunung Sarik with the reason to provide improved operator services, especially XL operator. In this final project to design using Pathloss 4.0 software as a tool that can facilitate a planner in calculating link budget. In this design the parameters used are propagation distance between sites, Effective Isotropic Received Power (EIRP), Free Space Loss (FSL), Isotropic Received Level (IRL), Received Signal Level (RSL) and Fade Margin (FM). On the calculation of the microwave transmission line of the kuranji area - University Andalas  with a propagation distance of 1.17 km, University Andalas - Gunung Sarik with a propagation distance of 1.01 km, Gunung Sarik – Kuranji with a propagation distance of 1.19 km.
Multiple Input Multiple Output Slot Antenna Design  With -22 Db Isolation Without Decoupling Structure For Application On Ultra Wide Band Marselina, Nadilla; Septima, Uzma; Yolanda, Amelia; Yustini, Yustini
International Journal of Wireless And Multimedia Communications Vol. 1 No. 2 (2024): International Journal of Wireless And Multimedia Communications
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62671/jowim.v1i2.53

Abstract

Technology that is always evolving requires us to always make the latest innovations, one of which is in the field of telecommunications. Currently, multiple input multiple output (MIMO) technology is widely used in ultra wideband (UWB) systems to overcome the effects of multipath fading. Multiple antennas are used to increase channel capacity. Two-element MIMO UWB systems have several techniques for obtaining good isolation between antenna elements. In this final project, the design and analysis of the change of a single UWB slot antenna into a 2-element MIMO UWB antenna is carried out by placing the antenna elements asymmetrically to get high antenna isolation. The proposed UWB MIMO antenna has a very compact size of 42×25 mm2. The fed slot microstrip antenna acts as a single UWB antenna element. Antenna design using CST Study Suite software. In the simulation results, a single UWB slot antenna that is modified into a UWB MIMO antenna has a return loss of -28 dB, a bandwidth of 7.2514 GHz, isolation below -20 dB, a VSWR of VSWR 2 in the frequency range of 3.7002 GHz to 9.6546 GHz, the gain reaches 3.2 dBi, and radiation pattern which is quasi omnidirectional.
Evaluasi Kinerja Eksperimental Mekanisme Gateway-Polled Sequential Access (GPSA) pada Jaringan LoRa Multi-Node Single-hop untuk Aplikasi Internet of Things (IoT) Ridho, Sahid; Dahlan, A Ahmad; Yustini, Yustini; Rusfandi, Rusfandi; Ferdiansyah, Ferdiansyah
Jurnal Teknologi Vol 25, No 3 (2025): Desember 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i3.8301

Abstract

This study presents the development and experimental evaluation of a single-hop multi-node LoRa communication system implementing the Gateway-Polled Sequential Access (GPSA) mechanism. The proposed GPSA scheme is a simplified form of Time Division Multiple Access (TDMA), where the gateway acts as the central controller that sequentially triggers each node via a START command, ensuring collision-free communication. The system was tested in four communication scenarios (1–4 nodes) at distances of 10 m, 50 m, 100 m, and 200 m in an open-field environment using E22-900T22D LoRa modules, INA219 current sensors, and a microSD-based logging system. The evaluated parameters included Received Signal Strength Indicator (RSSI), Round Trip Time (RTT), Packet Delivery Ratio (PDR), and the energy consumption of both the gateway and nodes. Experimental results show that the RSSI decreased reasonably from −51 dBm to −82 dBm as distance increased, while RTT remained stable between 760–820 ms. The PDR consistently achieved 100% across all test scenarios, confirming the reliability of the sequential polling mechanism in avoiding transmission collisions. Node energy consumption remained stable at 16–18 mJ per communication cycle and was independent of distance, while gateway energy consumption increased proportionally with the number of active nodes. With a 7.4 V / 1100 mAh Li-Po battery, each node can operate continuously for approximately 17 days. Overall, the LoRa-GPSA system demonstrated high energy efficiency, communication stability, and straightforward implementation, making it an effective solution for medium-range IoT field applications
IMPLEMENTASI BOOSTER 4G LONG TERM EVOLUTION (LTE) PADA PROVIDER TRI DI GEDUNG F POLITEKNIK NEGERI PADANG Widiansyah, Iqwan; Aulia, Siska; Yustini, Yustini
SULIWA: Jurnal Multidisiplin Teknik, Sains, Pendidikan dan Teknologi Vol. 3 No. 1 (2026): SULIWA: Jurnal Multidisiplin Teknik, Sains, Pendidikan dan Teknologi, Maret 202
Publisher : LEMBAGA KAJIAN PEMBANGUNAN PERTANIAN DAN LINGKUNGAN (LKPPL)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62671/suliwa.v3i1.125

Abstract

This study examines the quality of 4G LTE that operates indoors, namely at Gedung F Politeknik Negeri Padang, where initial testing reveals extremely low Reference Signal Received Power (RSRP) of about 36.86% due to physical stress. The primary goal of this study is to analyze 4G LTE quality based on RSRP, RSRQ, and SINR parameters before and after booster implementation, as well as to identify technical and environmental factors that affect kinerjanya. The technique used involves using a 4G LTE booster from Tri with an omnidirectional antenna, a log-periodic antenna, and a pengulang amplifier. Data is collected using the walk test method using the TEMS Pocket lunak perangkat, and it is analyzed using TEMS Discovery. The study's findings indicate a significant increase, with the rata-rata RSRP rising from 34.86% before to pemasangan to 97.83% in F304, 47.40% in F305, and 65.95% in koridor. RSRQ also shows improvement, with 91.44% becoming 100% in F304 and koridor and 99.74% in F305, while SINR remains stable at 100% in all locations. In summary, 4G LTE boosters are effective in improving signal quality, especially in the RSRP parameter, therefore they can improve data service availability in areas with worse signal quality.
Co-Authors - Zurnawita Abdi Abdillah Ade Usra Berli Ahmad Dahlan Amelia Yolanda Anjali, Putri Aprinal Adila Asril Aprinal Adila.A Arsis Warman Asri, Aprinal Adila cania, marisa Dahlan, A Ahmad Deddy Prayama Dedi Tri Laksono, Dedi Tri Denisa Putri Maharani Dikky Chandra Fadli Fadilah Islami Ferdiansyah Ferdiansyah Firdaus Firdaus Firmansyah, Herian Hadria Octavia Hadria Oktavia Herry Setiawan Herry Setiawan Ifni Joi Lifwarda Lifwarda Maria, Popi Maritsyah Putra, Danda Marselina, Nadilla Meilisa, Mira Muchtara, Efendi Nasrul Nasrul Nasrul Nindika, Aprilia Nugraha, Bintang Aulia Popy Maria Popy Maria Putri Azizah Herwita Rahmatullah Hafizt Ramadan, Zardi Randhika Rianza Roza Susanti Rusfandi Rusfandi Sahid Ridho Silfia Rifka Siska Aulia Siska Aulia Uzma Septima Uzma Septima - Widiansyah, Iqwan Wiwik Wiharti Yulindon Zurnawita Zurnawita