Inverted T-Shaped DGS loaded nearly square microstrip patch antenna for wireless applications

ABSTRACT

This research presents an inverted ‘T’-shaped Defected Ground Structure (DGS)-loaded single feed circularly polarised nearly square microstrip patch antenna for wireless communication applications. The proposed antenna structure uses an inverted ‘T’-shaped DGS and exhibits an overall impedance (S11< −10 dB) of 665 MHz (12%) and an axial ratio bandwidth of 140 MHz (2.61%) with right-hand circular polarisation having a gain of 3.91 dBi. The proposed antenna is designed, simulated and fabricated using the FR4 substrate. The electrical size of the designed microstrip patch antenna is 0.238λ × 0.216λ. Using an inverted ‘T’-shaped DGS, the antenna size has been reduced by 13.8%. The detailed design and analysis of the proposed broadband circularly polarised microstrip patch antenna are discussed and presented. The fabricated antenna is tested, and the measured impedance bandwidth is 557 MHz (10%). The measured results are in good agreement with simulated results, and the proposed antenna can be suitable for WLAN, Wi-MAX and Hyper LAN applications.

KEYWORDS:

• Defected ground structure
• broadband
• circular polarisation

Acknowledgments

Mandar P. Joshi is highly indebted to Management and Principal, GES’s R. H. Sapat College of Engineering, Management Studies and Research, Nashik, India, for allowing him to pursue Ph. D. under Savitribai Phule Pune University, Pune, India.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Mandar P. Joshi

Mandar P. Joshi received B.E. in Electronics and Telecommunication Engineering from North Maharashtra University, Jalgaon (MS) India, M.E. in Electronics from Dr. Babasaheb Ambedkar Marathwada University, Aurangabad (MS) India in 2003 and 2012 respectively. Presently, he is pursuing Ph.D. in Savitribai Phule Pune University, Pune under the guidance of Prof. Dr. V. J. Gond. His research interest includes microstrip patch antennas for Vehicular communication, Wi-Fi, WLAN, Wi-MAX, BAN, broadband microstrip antennas, wearable microstrip antenna.

Vitthal J. Gond

Vithhal J. Gond is doctorate in Electronics and Communication Engineering. His area of interest is Optical Communication, Broadband Communication and Antenna design. He is having 17 research papers to his credit. Presently he is working as Professor & Head in Electronics and Telecommunication Engineering in MET’s Institute of Engineering, Nashik (MS) India.