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All Journal INAJEEE (Indonesian Journal of Electrical and Electronics Engineering)
Lutfia, Paulen Aulia
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Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering

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Circular Polarization of the Square, Circular, Triangle, and Hexagonal Microstrip Antenna Nurhayati, Nurhayati; Lutfia, Paulen Aulia; Figueredo, Raimundo Eider; de Oliveira, Alexandre Manicoba; Justo, João Francisco; Fukusako, Takeshi
INAJEEE (Indonesian Journal of Electrical and Electronics Engineering) Vol 3, No 1 (2020)
Publisher : Jurusan Teknik Elektro Fakultas Teknik UNESA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajeee.v3n1.p5-9

Abstract

Microstrip antenna with circular polarization can be applied for many applications. Some microstrip antenna with square, circular, triangular, and hexagonal shape has been designed to get return loss, axial ratio, and radiation performance. We compare twelve microstrip antenna by maintaining its substrate dimension, feeding shape, and outer patch dimension. Even though antenna has a circular patch, it doesn’t always produce circular polarization. From the simulation, we found that with add some structure, the antenna can reach multiband resonance from 1 to 6 GHz. The Circular patch antenna reached seven numbers of the multiband resonance frequency. The hexagonal patch antenna reaches the highest directivity as 9.53 dBi. The circular polarization is achieved for a square and Hexagonal patch shape with axial ratio value is 1.96 dB at 4 GHz and  1.26 dB at 4.1 GHz sequentially at phi 900 and theta 900. 
Umbrella Monopole Antenna for 5G Applications Lutfia, Paulen Aulia; Nurhayati, Nurhayati; Christydass, Samuel Prasad Jones
INAJEEE (Indonesian Journal of Electrical and Electronics Engineering) Vol 4, No 1 (2021)
Publisher : Jurusan Teknik Elektro Fakultas Teknik UNESA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajeee.v4n1.p8-11

Abstract

Umbrella Monopole Antenna (UMA) proposed in this paper for 5G application. We designed four models of UMA, i.e: UMA-A, UMA-B, UMA-C, and UMA-D. The antenna has a curvature in the patch as an umbrella shape with a feeding shape a microstrip feed line. Four variations of the patch antenna have been designed and get different performance in VSWR, surface current, and directivity. The proposed antenna has a wide bandwidth that operates 8 GHz – 30 GHz with VSWR <2 dB. The Increasing of directivity is reached for UMA-A, UMA-C, UMA-D, and UMA-B, i.e: 6.38 dBi, 7.97 dBi, 8,84dBi, and 9,15 dBi respectively at 24 GHz.  The maximum gain has been reached for UMA-B of 9.15. The lowest frequency that has a return loss of 10 dB has resulted for UMA-D in the frequency around 5 GHz. All of the UMA antennas can be applied for 5G mmwave applications at 24 GHz and 28 GHz.
Co-Authors Christydass, Samuel Prasad Jones de Oliveira, Alexandre Manicoba Figueredo, Raimundo Eider Fukusako, Takeshi Justo, João Francisco Nurhayati Nurhayati