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Microstrip antenna miniaturization with fractal EBG and SRR loads for linear and circular polarizations

Published online by Cambridge University Press:  23 June 2016

Mohammad Sadegh Sedghi ,
Mohammad Naser-Moghadasi  and
Ferdows B. Zarrabi
Mohammad Sadegh Sedghi*
Affiliation:
Faculty of Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Mohammad Naser-Moghadasi
Affiliation:
Faculty of Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Ferdows B. Zarrabi
Affiliation:
Young Researchers and Elite Club, Babol Branch Islamic Azad University, Babol, Iran
*
Corresponding author: M.S. Sedghi Email: [email protected]
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Abstract

In this paper, combination of electromagnetic band gap (EBG) and split-ring resonator (SRR) loads with fractal formation for miniaturization of microstrip antenna is noticed. Here two different shapes of antenna have been studied with two well-known metamaterial structures as parasitic elements. A conventional microstrip antenna, which is surrounded by four EBG unit cells, is chosen as the first antenna. It has an effective resonance at 2.5. The Minkowski fractal method is applied to EBG unit cells in this stage. The Minkowski fractal structure is implemented for accession of effective capacitance in EBG unit cells. The second antenna frequencies are 2.5 and 5.9 GHz. It contains a slot structure with four SRRs, used for making parasitic elements and for achieving multi-band characteristic. The fractal method is used to improve the inductance of SRR structure by increasing the effective length of microstrip line. At this stage, the applied fractal structure has been modified, so that the frequency of wireless application could be achieved. In the last step, by some changes in feed line of the slot antenna, circular polarization (CP) is obtained for the second antenna, which shows that SRR load can be helpful for making the CP.

Keywords

EBGCircular polarizationSlotSRRWLAN
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Issue 4 , May 2017 , pp. 891 - 901
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2016 

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