Microstrip-fed Circularly Polarized Antenna Array Using Semi-fractal Cells for Implicational Band

ABSTRACT

In this paper, extracted results are presented for a novel dual-band microstrip antenna array with circularly polarized property for second band whose design process is categorized in two main steps: (1) semi-fractal element design, (2) dual-transformed feed network design. The circularly polarized semi-fractal radiator patch is fed through a symmetric microstrip, dual-transformed, and incorporating bended methods in the corners of feed strips in order to reduce its radiation distortion effect and cross polarization level. The semi-fractal element of the array exhibits an impedance bandwidth from 3.8 to 7.2 GHz, and 3 dB axial-ratio from 5.2 to 5.6 GHz. A 1 × 4 novel semi-fractal element of antenna array was linked together using dual-transformed feed network to improve its radiation performance. The measured 3 dB axial-ratio (AR) of the antenna array extends from 4.85 to 5.82 GHz, and impedance bandwidth is between 3.4 and 4 GHz in band I and between 5.1 and 6.7 GHz in band II for voltage standing wave ratio (VSWR) ≤ 2.

Keywords:

• Antenna array
• Circular polarization
• C-Band
• Feeding network
• Gain enhancement

Additional information

Notes on contributors

Tohid Sedgeechongaraluye-Yekan

Tohid Sedgeechongarlouye-Yekan received the BS degree in electronic engineering from IAU, Urmia Branch, Urmia, Iran, in 2007. He received MS degree in electrical engineering in University of Urmia, Iran, in 2009. Now he is a PhD student in IAU Science Research Branch, Tehran, Iran. His research interests include antennas, circular polarization, radar application, and intelligent computing. He has published more than 30 papers in his referred international journal and national/international conferences.

E-mail: [email protected]

R. A. Sadeghzadeh

Ramezan Ali Sadeghzadeh received the BSc degree in communication engineering from the University of Khajeh Nasir, in 1984 and the MSc and PhD degrees in communication engineering from the University of Bradford, UK, in 1987 and 1990, respectively. From 1980 to 1984, he worked with the Iran Telecommunication Company. During 1990–1998, he served as a postdoctoral research assistant in the Electrical and Electronic Engineering Department, University of Bradford, UK. He is now with the University of Khajeh Nasir Tousi, Iran, since 1998. His research interests include antenna, propagation, electromagnetic, numerical analysis, electro-magnetic wave exposure and wireless communication. He has published about 60 papers in reputable journals and conferences.

E-mail: [email protected] >

M. Naser-Moghadasi

Mohammad Naser-Moghadasi was born in Saveh, Iran, in 1959. He received the BSc degree in communication engineering in 1985 from the Leed Metropolitan University (formerly Leeds polytechnic), U.K. and the PhD degree in1993, from the University of Bradford, U.K. Between 1985 and 1987, he worked as an RF design engineer for the Gigatech Company, New-castle Upon Tyne, UK. From 1987 to 1989, he was offered a two years Postdoctoral position at the University of Nottingham, UK, to pursue research on microwave cooking of materials. In 1995, he joined Science and Research Branch, Islamic Azad University, Iran, where he is currently the Head of postgraduate studies and also a member of Central Commission for Scientific Literacy and Art Societies. He has published about 90 papers in different journals and conferences. His main areas of interest in research are microstrip antenna, microwave passive and active circuits, optimization methods, RF MEMS. Dr. Naser-Moghadasi is a member of the Institution of Engineering and Technology (IET) and the Institute of Electronics, Information and Communication Engineers (IEICE). He was awarded full scholarship by the Leeds Educational Authority to pursue an MPhil studying in CAD of microwave circuits.

E-mail: [email protected]