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All Journal International Journal of Wireless And Multimedia Communications
Nasrul Nawi
Politeknik Negeri Padang
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering

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Microstrip Antenna with a Defective Ground Structure (DGS) Motor for Wireless Fidelity Applications (Wi-Fi) at 2.4 GHz Azizah Firdausa; Nasrul Nawi; Uzma Septima
International Journal of Wireless And Multimedia Communications Vol. 1 No. 1 (2024): International Journal of Wireless And Multimedia Communications
Publisher : Politeknik Negeri Padang

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Abstract

Wireless fidelity (WiFi) is a wireless connection using radio technology so that users can transfer data quickly and safely. However, at a certain distance there is a decrease in signal speed on WiFi, as happened in Tursina's rented house located in Pasar Baru. When away from WiFi, the internet speed will decrease and the connection becomes unstable. Therefore, an antenna that has a high gain is needed in the form of a microstrip antenna with a working frequency of 2.4 GHz. This final project aims to design a microstrip antenna with the Defected Ground Structure (DGS) method for wireless fidelity (WiFi) applications at a frequency of 2.4 GHz, and analyse antenna parameters such as return loss, VSWR, bandwidth, gain, and radiation pattern. Where the antenna design uses CST Studio Suite 2019 software. After the simulation results are as desired, then fabrication or manufacture of the antenna is carried out. The simulation results after optimising are return loss -40.79 dB, VSWR 1.019, bandwidth 543.9 MHz, gain of 1.312 dBi and bidirectional radiation pattern. After the simulation is carried out, the next fabrication or manufacture of the antenna. In the measurement of the fabricated microstrip antenna using Vector Network Analyser shows a return loss value of -16.07 dB and VSWR 1.375. the measurement results of the fabricated antenna meet the specifications of a good antenna for WiFi applications.
11-Element Yagi Antenna for 1800 MHz Frequency Fannia Rekha hamdila; Nasrul Nawi; Sri Nita; M Noer; Herman Yani
International Journal of Wireless And Multimedia Communications Vol. 1 No. 1 (2024): International Journal of Wireless And Multimedia Communications
Publisher : Politeknik Negeri Padang

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Abstract

The need for internet connection is very important because everything is connected to each other with the internet, but due to limitations on access points, many areas are still experiencing difficulties in accessing the internet, one of which is the suburban area. Suburban areas that are indicated to be still difficult to reach due to obstacles from buildings, and the influence of weather. In order for the signal to be reached in this area, an 11-element yagi antenna with a working frequency of 1800 MHz is needed which is expected to produce a high gain so that the antenna beam is maximised. This final project aims to design an 11-element Yagi antenna at a working frequency of 1800 MHz, and analyse antenna parameters such as return loss, VSWR, bandwidth, gain, and polaradiation. Where the design of the yagi antenna uses CST Studio Suite 2019 software. After the simulation results are as desired, then fabrication or manufacture of the antenna is carried out. The simulation results after optimising are -26.00 dB, VSWR 1.10, and gain 12.32 dB. After the simulation is carried out, the next fabrication or manufacture of the 11-element Yagi antenna, the measurement obtains a return loss value of -11.29 dB, and VSWR 1.74, although the measurement results are far from the simulation but the results of this measurement have met the requirements of the antenna specifications.
Yagi Antenna With Three Reflector Elements to  Amplify 4G Signal In Suburban Areas Rianto Rianto; Nasrul Nawi; lince malkis
International Journal of Wireless And Multimedia Communications Vol. 1 No. 1 (2024): International Journal of Wireless And Multimedia Communications
Publisher : Politeknik Negeri Padang

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Abstract

As the number of cell phone users increases and the high cost of 4G network infrastructure, the investment needed to build 4G infrastructure is Rp. 278 trillion, so that many suburban cell phone users (suburban areas) get 4G access with poor network quality. So it requires a repeater as an effective solution with a small capital to increase the coverage area in weak signal areas. Yagi antenna is an antenna suitable for long-distance communication with three reflector elements to strengthen 4G signals in suburban areas at a frequency of 1710-1880 MHz. The material for making the antenna consists of aluminum pipe as a reflector element and a director element with a diameter of 8.4 mm and wire as a driven element with a diameter of 4 mm. In the manufacture there is the addition of a balun supply and three reflector elements which can improve the performance of the parameters of the yagi antenna. Yagi antenna testing is carried out in two ways, namely the Anechoic Chamber room and the Telecommunication Electronics Lab. In this test, the transmitter uses a dipole antenna. and for the transmission cable, use a high school connector cable to operate the Anechoic Chamberm device designated by a female student who has been trained in measurements using the Network Analyzer software. From the results of manual measurements and the Network Analyzer, the results of a unidirectional radiation pattern are obtained, the maximum power level is -23.24 dBm, the frequency resonance 1809 MHz, Bandwidth 52 MHz, HPBW 〖25〗^0, FBR 12.97 dB, Gain 8.572 dB, VSWR 1.09, and Return loss -26.6 dB design using MMANA-GAL software simulation shows that the antenna works at frequency 1,800 MHz, antenna impedance 42.84 + j2,906 Ω, VSWR 1.18, Gain 20.66 dB, and FBR 23.77 dB and has a unidirectional radiation pattern
Co-Authors Azizah Firdausa Fannia Rekha hamdila Herman Yani lince malkis M Noer Rianto Rianto sri nita Uzma Septima -