Compact Unit-Cell-Based Semi-Fractal Antenna with Filtering Properties of Interference Bands Embedded with CBP Strips

ABSTRACT

In this paper, a compact coplanar waveguide (CPW)-fed Ultra Wide Band (UWB) semi-fractal (SF) antenna with dual band filtering characteristics and enhanced bandwidth is presented. The main features of the proposed SF-antenna are the small size of 15 × 15 mm² dimensions and band-notched characteristics that are obtained without changing the SF radiator. Dual band-notched characteristics are achieved by having a pair of a specific form of shaped strips embedded as conductor back plane (CBP) and defecting CPW ground surface. Also, wider impedance bandwidth can be achieved with this unit-cell-based fractal structure on the radiator. The measured results illustrate that the proposed SF-antenna operates over the VSWR < 2, except two notched bands (3.25–4.32 and 5.02–5.97 GHz), aimed at suppressing any interference from WiMAX IEEE802.16 (3.3–3.6 GHz), C-band (3.7–4.2 GHz), and wireless local area network IEEE802.11a (5.15–5.825 GHz). The SF-antenna has a desirable radiation pattern and gain characteristics for UWB frequency band range. Measured results of the fabricated SF-antenna with the specific form of CBP, unit-cell patterns for radiator and defected CPW ground are presented.

KEYWORDS:

• Coplanar waveguide (CPW) antennas
• frequency band-notched function
• SF-antenna

ACKNOWLEDGMENTS

The author would like to thank Professor Bal S. Virdee for his valuable discussions and suggestions. This research is the consequence of a project agreed with research committee at Urmia Branch, Islamic Azad University. The author would like to appreciate Islamic Azad University, Urmia Branch for its support.

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the author.

Additional information

Notes on contributors

T. Sedghi

Tohid Sedghi received his BS degree in electronic engineering from the Department of Electrical Engineering, Islamic Azad University, Urmia Branch, Urmia, Iran, in 2007. He received his MS degree in electrical engineering from the University of Urmia, Iran, in 2009. He got his PhD degree from the Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran, in 2015. His research interests include antennas and propagation, dielectric resonator, phased arrays, metamaterial, radar application, intelligent computing, and data compression. He has published more than 30 papers in his referred international journal and more than 15 papers in national/international conferences. Now he is an assistant professor at the Department of Electrical Engineering, Islamic Azad University, Urmia Branch.

Corresponding author. E-mail: [email protected], [email protected]